See what's going on with flipcode!




This section of the archives stores flipcode's complete Developer Toolbox collection, featuring a variety of mini-articles and source code contributions from our readers.

 

  Virtual File System
  Submitted by



This is a virtual file system that works much like the pk3 system in Quake3. You tell the system where to look for zip files, and you can then access files inside Those zip files without worrying about where the file is. The File system can use more than one zip file containing files, and if the same filename Is found more than once, the file system uses the one with the latest date mark. But wait, thereÂ’s more! The file system also looks for files outside of zip files, so you can add file resources without having to add them to a zip. And because you can use more than one zip, you can easily patch your game by simply adding a new zip with updated files to the dir. I use ZLIB to access the zip files. This code is free to use anyway you like, but it would be fun if you let me know if you do.


Currently browsing [vfs.zip] (55,494 bytes) - [unzip.c] - (28,697 bytes)

/* unzip.c -- IO on .zip files using zlib 
   Version 0.15 beta, Mar 19th, 1998,

Read unzip.h for more info */


#include <stdio.h> #include <stdlib.h> #include <string.h> #include "zlib.h" #include "unzip.h"

#ifdef STDC # include <stddef.h> # include <string.h> # include <stdlib.h> #endif #ifdef NO_ERRNO_H extern int errno; #else # include <errno.h> #endif

#ifndef local # define local static #endif /* compile with -Dlocal if your debugger can't find static symbols */



#if !defined(unix) && !defined(CASESENSITIVITYDEFAULT_YES) && \ !defined(CASESENSITIVITYDEFAULT_NO) #define CASESENSITIVITYDEFAULT_NO #endif

#ifndef UNZ_BUFSIZE #define UNZ_BUFSIZE (16384) #endif

#ifndef UNZ_MAXFILENAMEINZIP #define UNZ_MAXFILENAMEINZIP (256) #endif

#ifndef ALLOC # define ALLOC(size) (malloc(size)) #endif #ifndef TRYFREE # define TRYFREE(p) {if (p) free(p);} #endif

#define SIZECENTRALDIRITEM (0x2e) #define SIZEZIPLOCALHEADER (0x1e)

/* I've found an old Unix (a SunOS 4.1.3_U1) without all SEEK_* defined.... */

#ifndef SEEK_CUR #define SEEK_CUR 1 #endif

#ifndef SEEK_END #define SEEK_END 2 #endif

#ifndef SEEK_SET #define SEEK_SET 0 #endif

/* unz_file_info_interntal contain internal info about a file in zipfile*/ typedef struct unz_file_info_internal_s { uLong offset_curfile;/* relative offset of local header 4 bytes */ } unz_file_info_internal;

/* file_in_zip_read_info_s contain internal information about a file in zipfile, when reading and decompress it */ typedef struct { char *read_buffer; /* internal buffer for compressed data */ z_stream stream; /* zLib stream structure for inflate */

uLong pos_in_zipfile; /* position in byte on the zipfile, for fseek*/ uLong stream_initialised; /* flag set if stream structure is initialised*/

uLong offset_local_extrafield;/* offset of the local extra field */ uInt size_local_extrafield;/* size of the local extra field */ uLong pos_local_extrafield; /* position in the local extra field in read*/

uLong crc32; /* crc32 of all data uncompressed */ uLong crc32_wait; /* crc32 we must obtain after decompress all */ uLong rest_read_compressed; /* number of byte to be decompressed */ uLong rest_read_uncompressed;/*number of byte to be obtained after decomp*/ FILE* file; /* io structore of the zipfile */ uLong compression_method; /* compression method (0==store) */ uLong byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/ } file_in_zip_read_info_s;

/* unz_s contain internal information about the zipfile */ typedef struct { FILE* file; /* io structore of the zipfile */ unz_global_info gi; /* public global information */ uLong byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/ uLong num_file; /* number of the current file in the zipfile*/ uLong pos_in_central_dir; /* pos of the current file in the central dir*/ uLong current_file_ok; /* flag about the usability of the current file*/ uLong central_pos; /* position of the beginning of the central dir*/

uLong size_central_dir; /* size of the central directory */ uLong offset_central_dir; /* offset of start of central directory with respect to the starting disk number */

unz_file_info cur_file_info; /* public info about the current file in zip*/ unz_file_info_internal cur_file_info_internal; /* private info about it*/ file_in_zip_read_info_s* pfile_in_zip_read; /* structure about the current file if we are decompressing it */ } unz_s;

/* =========================================================================== Read a byte from a gz_stream; update next_in and avail_in. Return EOF for end of file. IN assertion: the stream s has been sucessfully opened for reading. */

local int unzlocal_getShort(FILE *fin,uLong *pi) { unsigned short c; int err = fread(&c, 2, 1, fin); if (err==1) { *pi = (uLong)c; return UNZ_OK; } else { if (ferror(fin)) return UNZ_ERRNO; else return UNZ_EOF; } }

local int unzlocal_getLong(FILE *fin,uLong *pi) { uLong c; int err = fread(&c, 4, 1, fin); if (err==1) { *pi = (uLong)c; return UNZ_OK; } else { if (ferror(fin)) return UNZ_ERRNO; else return UNZ_EOF; } }

#define BUFREADCOMMENT (0x400)

/* Locate the Central directory of a zipfile (at the end, just before the global comment) */ local uLong unzlocal_SearchCentralDir(FILE *fin) { unsigned char* buf; uLong uSizeFile; uLong uBackRead; uLong uMaxBack=0xffff; /* maximum size of global comment */ uLong uPosFound=0; if (fseek(fin,0,SEEK_END) != 0) return 0;

uSizeFile = ftell( fin ); if (uMaxBack>uSizeFile) uMaxBack = uSizeFile;

buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4); if (!buf) return 0;

uBackRead = 4; while (uBackRead<uMaxBack) { uLong uReadSize,uReadPos ; int i; if (uBackRead+BUFREADCOMMENT>uMaxBack) uBackRead = uMaxBack; else uBackRead+=BUFREADCOMMENT; uReadPos = uSizeFile-uBackRead ; uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ? (BUFREADCOMMENT+4) : (uSizeFile-uReadPos); if (fseek(fin,uReadPos,SEEK_SET)!=0) break;

if (fread(buf,(uInt)uReadSize,1,fin)!=1) break;

for (i=(int)uReadSize-3; (i--)>0;) if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) && ((*(buf+i+2))==0x05) && ((*(buf+i+3))==0x06)) { uPosFound = uReadPos+i; break; }

if (uPosFound!=0) break; } TRYFREE(buf); return uPosFound; }

/* Open a Zip file. path contain the full pathname (by example, on a Windows NT computer "c:\\test\\zlib109.zip" or on an Unix computer "zlib/zlib109.zip". If the zipfile cannot be opened (file don't exist or in not valid), the return value is NULL. Else, the return value is a unzFile Handle, usable with other function of this unzip package. */ extern unzFile ZEXPORT unzOpen (const char *path) { unz_s us; unz_s *s; uLong central_pos,uL; FILE * fin ;

uLong number_disk; /* number of the current dist, used for spaning ZIP, unsupported, always 0*/ uLong number_disk_with_CD; /* number the the disk with central dir, used for spaning ZIP, unsupported, always 0*/ uLong number_entry_CD; /* total number of entries in the central dir (same than number_entry on nospan) */

int err=UNZ_OK;

fin=fopen(path,"rb"); if (!fin) return NULL;

central_pos = unzlocal_SearchCentralDir(fin); if (!central_pos) err=UNZ_ERRNO;

if (fseek(fin,central_pos,SEEK_SET)!=0) err=UNZ_ERRNO;

/* the signature, already checked */ if (unzlocal_getLong(fin,&uL)!=UNZ_OK) err=UNZ_ERRNO;

/* number of this disk */ if (unzlocal_getShort(fin,&number_disk)!=UNZ_OK) err=UNZ_ERRNO;

/* number of the disk with the start of the central directory */ if (unzlocal_getShort(fin,&number_disk_with_CD)!=UNZ_OK) err=UNZ_ERRNO;

/* total number of entries in the central dir on this disk */ if (unzlocal_getShort(fin,&us.gi.number_entry)!=UNZ_OK) err=UNZ_ERRNO;

/* total number of entries in the central dir */ if (unzlocal_getShort(fin,&number_entry_CD)!=UNZ_OK) err=UNZ_ERRNO;

if ((number_entry_CD!=us.gi.number_entry) || (number_disk_with_CD!=0) || (number_disk!=0)) err=UNZ_BADZIPFILE;

/* size of the central directory */ if (unzlocal_getLong(fin,&us.size_central_dir)!=UNZ_OK) err=UNZ_ERRNO;

/* offset of start of central directory with respect to the starting disk number */ if (unzlocal_getLong(fin,&us.offset_central_dir)!=UNZ_OK) err=UNZ_ERRNO;

/* zipfile comment length */ if (unzlocal_getShort(fin,&us.gi.size_comment)!=UNZ_OK) err=UNZ_ERRNO;

if ((central_pos<us.offset_central_dir+us.size_central_dir) && (err==UNZ_OK)) err=UNZ_BADZIPFILE;

if (err!=UNZ_OK) { fclose(fin); return NULL; }

us.file=fin; us.byte_before_the_zipfile = central_pos - (us.offset_central_dir+us.size_central_dir); us.central_pos = central_pos; us.pfile_in_zip_read = NULL;

s=(unz_s*)ALLOC(sizeof(unz_s)); *s=us; unzGoToFirstFile((unzFile)s); return (unzFile)s; }

/* Close a ZipFile opened with unzipOpen. If there is files inside the .Zip opened with unzipOpenCurrentFile (see later), these files MUST be closed with unzipCloseCurrentFile before call unzipClose. return UNZ_OK if there is no problem. */ extern int ZEXPORT unzClose (unzFile file) { unz_s* s; if (!file) return UNZ_PARAMERROR; s=(unz_s*)file;

if (s->pfile_in_zip_read) unzCloseCurrentFile(file);

fclose(s->file); TRYFREE(s); return UNZ_OK; }

/* Write info about the ZipFile in the *pglobal_info structure. No preparation of the structure is needed return UNZ_OK if there is no problem. */ extern int ZEXPORT unzGetGlobalInfo (unzFile file, unz_global_info *pglobal_info) { unz_s* s; if (!file) return UNZ_PARAMERROR; s=(unz_s*)file; *pglobal_info=s->gi; return UNZ_OK; }

/* Get Info about the current file in the zipfile, with internal only info */ local int unzlocal_GetCurrentFileInfoInternal OF((unzFile file, unz_file_info *pfile_info, unz_file_info_internal *pfile_info_internal, char *szFileName, uLong fileNameBufferSize, void *extraField, uLong extraFieldBufferSize, char *szComment, uLong commentBufferSize));

local int unzlocal_GetCurrentFileInfoInternal (unzFile file, unz_file_info *pfile_info, unz_file_info_internal *pfile_info_internal, char *szFileName, uLong fileNameBufferSize, void *extraField, uLong extraFieldBufferSize, char *szComment, uLong commentBufferSize) { unz_s* s; unz_file_info file_info; unz_file_info_internal file_info_internal; int err=UNZ_OK; uLong uMagic; long lSeek=0;

if (!file) return UNZ_PARAMERROR; s=(unz_s*)file; if (fseek(s->file,s->pos_in_central_dir+s->byte_before_the_zipfile,SEEK_SET)!=0) err=UNZ_ERRNO;

/* we check the magic */ if (err==UNZ_OK) if (unzlocal_getLong(s->file,&uMagic) != UNZ_OK) err=UNZ_ERRNO; else if (uMagic!=0x02014b50) err=UNZ_BADZIPFILE;

fread(&file_info, sizeof(file_info)-2*4, 1, s->file); // 2*4 is the size of 2 my vars if (unzlocal_getLong(s->file,&file_info_internal.offset_curfile) != UNZ_OK) err=UNZ_ERRNO;

file_info.offset = file_info_internal.offset_curfile; file_info.c_offset = s->pos_in_central_dir;

lSeek+=file_info.size_filename; if ((err==UNZ_OK) && (szFileName)) { uLong uSizeRead ; if (file_info.size_filename<fileNameBufferSize) { *(szFileName+file_info.size_filename)='\0'; uSizeRead = file_info.size_filename; } else uSizeRead = fileNameBufferSize;

if ((file_info.size_filename>0) && (fileNameBufferSize>0)) if (fread(szFileName,(uInt)uSizeRead,1,s->file)!=1) err=UNZ_ERRNO; lSeek -= uSizeRead; }

if ((err==UNZ_OK) && (extraField)) { uLong uSizeRead ; if (file_info.size_file_extra<extraFieldBufferSize) uSizeRead = file_info.size_file_extra; else uSizeRead = extraFieldBufferSize;

if (lSeek!=0) if (fseek(s->file,lSeek,SEEK_CUR)==0) lSeek=0; else err=UNZ_ERRNO; if ((file_info.size_file_extra>0) && (extraFieldBufferSize>0)) if (fread(extraField,(uInt)uSizeRead,1,s->file)!=1) err=UNZ_ERRNO; lSeek += file_info.size_file_extra - uSizeRead; } else lSeek+=file_info.size_file_extra;

if ((err==UNZ_OK) && (szComment)) { uLong uSizeRead ; if (file_info.size_file_comment<commentBufferSize) { *(szComment+file_info.size_file_comment)='\0'; uSizeRead = file_info.size_file_comment; } else uSizeRead = commentBufferSize;

if (lSeek!=0) if (fseek(s->file,lSeek,SEEK_CUR)==0) lSeek=0; else err=UNZ_ERRNO; if ((file_info.size_file_comment>0) && (commentBufferSize>0)) if (fread(szComment,(uInt)uSizeRead,1,s->file)!=1) err=UNZ_ERRNO; lSeek+=file_info.size_file_comment - uSizeRead; } else lSeek+=file_info.size_file_comment;

if ((err==UNZ_OK) && (pfile_info)) *pfile_info=file_info;

if ((err==UNZ_OK) && (pfile_info_internal)) *pfile_info_internal=file_info_internal;

return err; }



/* Write info about the ZipFile in the *pglobal_info structure. No preparation of the structure is needed return UNZ_OK if there is no problem. */ extern int ZEXPORT unzGetCurrentFileInfo (unzFile file, unz_file_info *pfile_info, char *szFileName, uLong fileNameBufferSize, void *extraField, uLong extraFieldBufferSize, char *szComment, uLong commentBufferSize) { return unzlocal_GetCurrentFileInfoInternal(file,pfile_info,NULL, szFileName,fileNameBufferSize, extraField,extraFieldBufferSize, szComment,commentBufferSize); }

/* Set the current file of the zipfile to the first file. return UNZ_OK if there is no problem */ extern int ZEXPORT unzGoToFirstFile (unzFile file) { int err=UNZ_OK; unz_s* s; if (!file) return UNZ_PARAMERROR; s=(unz_s*)file; s->pos_in_central_dir=s->offset_central_dir; s->num_file=0; err=unzlocal_GetCurrentFileInfoInternal(file,&s->cur_file_info, &s->cur_file_info_internal, NULL,0,NULL,0,NULL,0); s->current_file_ok = (err == UNZ_OK); return err; }

/* Set the current file of the zipfile to the next file. return UNZ_OK if there is no problem return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest. */ extern int ZEXPORT unzGoToNextFile (unzFile file) { unz_s* s; int err;

if (!file) return UNZ_PARAMERROR; s=(unz_s*)file; if (!s->current_file_ok) return UNZ_END_OF_LIST_OF_FILE; if (s->num_file+1==s->gi.number_entry) return UNZ_END_OF_LIST_OF_FILE;

s->pos_in_central_dir += SIZECENTRALDIRITEM + s->cur_file_info.size_filename + s->cur_file_info.size_file_extra + s->cur_file_info.size_file_comment ; s->num_file++; err = unzlocal_GetCurrentFileInfoInternal(file,&s->cur_file_info, &s->cur_file_info_internal, NULL,0,NULL,0,NULL,0); s->current_file_ok = (err == UNZ_OK); return err; }

extern int ZEXPORT unzLocateFileMy (unzFile file, uLong num, uLong pos) { unz_s* s; s = (unz_s *)file; s->pos_in_central_dir = pos; s->num_file = num; unzlocal_GetCurrentFileInfoInternal(file,&s->cur_file_info,&s->cur_file_info_internal,NULL,0,NULL,0,NULL,0); return 1; }

/* Read the local header of the current zipfile Check the coherency of the local header and info in the end of central directory about this file store in *piSizeVar the size of extra info in local header (filename and size of extra field data) */ local int unzlocal_CheckCurrentFileCoherencyHeader (unz_s *s, uInt *piSizeVar, uLong *poffset_local_extrafield, uInt *psize_local_extrafield) { uLong uMagic,uData,uFlags; uLong size_filename; uLong size_extra_field; int err=UNZ_OK;

*piSizeVar = 0; *poffset_local_extrafield = 0; *psize_local_extrafield = 0;

if (fseek(s->file,s->cur_file_info_internal.offset_curfile + s->byte_before_the_zipfile,SEEK_SET)!=0) return UNZ_ERRNO;

if (err==UNZ_OK) if (unzlocal_getLong(s->file,&uMagic) != UNZ_OK) err=UNZ_ERRNO; else if (uMagic!=0x04034b50) err=UNZ_BADZIPFILE;

if (unzlocal_getShort(s->file,&uData) != UNZ_OK) err=UNZ_ERRNO;

if (unzlocal_getShort(s->file,&uFlags) != UNZ_OK) err=UNZ_ERRNO;

if (unzlocal_getShort(s->file,&uData) != UNZ_OK) err=UNZ_ERRNO; else if ((err==UNZ_OK) && (uData!=s->cur_file_info.compression_method)) err=UNZ_BADZIPFILE;

if ((err==UNZ_OK) && (s->cur_file_info.compression_method!=0) && (s->cur_file_info.compression_method!=Z_DEFLATED)) err=UNZ_BADZIPFILE;

/* date/time */ if (unzlocal_getLong(s->file,&uData) != UNZ_OK) err=UNZ_ERRNO;

/* crc */ if (unzlocal_getLong(s->file,&uData) != UNZ_OK) err=UNZ_ERRNO; else if ((err==UNZ_OK) && (uData!=s->cur_file_info.crc) && ((uFlags & 8)==0)) err=UNZ_BADZIPFILE;

/* size compr */ if (unzlocal_getLong(s->file,&uData) != UNZ_OK) err=UNZ_ERRNO; else if ((err==UNZ_OK) && (uData!=s->cur_file_info.compressed_size) && ((uFlags & 8)==0)) err=UNZ_BADZIPFILE;

/* size uncompr */ if (unzlocal_getLong(s->file,&uData) != UNZ_OK) err=UNZ_ERRNO; else if ((err==UNZ_OK) && (uData!=s->cur_file_info.uncompressed_size) && ((uFlags & 8)==0)) err=UNZ_BADZIPFILE;

if (unzlocal_getShort(s->file,&size_filename) != UNZ_OK) err=UNZ_ERRNO; else if ((err==UNZ_OK) && (size_filename!=s->cur_file_info.size_filename)) err=UNZ_BADZIPFILE;

*piSizeVar += (uInt)size_filename;

if (unzlocal_getShort(s->file,&size_extra_field) != UNZ_OK) err=UNZ_ERRNO; *poffset_local_extrafield= s->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER + size_filename; *psize_local_extrafield = (uInt)size_extra_field;

*piSizeVar += (uInt)size_extra_field;

return err; } /* Open for reading data the current file in the zipfile. If there is no error and the file is opened, the return value is UNZ_OK. */ extern int ZEXPORT unzOpenCurrentFile (unzFile file) { int err=UNZ_OK; int Store; uInt iSizeVar; unz_s* s; file_in_zip_read_info_s* pfile_in_zip_read_info; uLong offset_local_extrafield; /* offset of the local extra field */ uInt size_local_extrafield; /* size of the local extra field */

if (!file) return UNZ_PARAMERROR; s=(unz_s*)file; if (!s->current_file_ok) return UNZ_PARAMERROR;

if (s->pfile_in_zip_read) unzCloseCurrentFile(file);

if (unzlocal_CheckCurrentFileCoherencyHeader(s,&iSizeVar, &offset_local_extrafield,&size_local_extrafield)!=UNZ_OK) return UNZ_BADZIPFILE;

pfile_in_zip_read_info = (file_in_zip_read_info_s*)ALLOC(sizeof(file_in_zip_read_info_s)); if (!pfile_in_zip_read_info) return UNZ_INTERNALERROR;

pfile_in_zip_read_info->read_buffer=(char*)ALLOC(UNZ_BUFSIZE); pfile_in_zip_read_info->offset_local_extrafield = offset_local_extrafield; pfile_in_zip_read_info->size_local_extrafield = size_local_extrafield; pfile_in_zip_read_info->pos_local_extrafield=0;

if (!pfile_in_zip_read_info->read_buffer) { TRYFREE(pfile_in_zip_read_info); return UNZ_INTERNALERROR; }

pfile_in_zip_read_info->stream_initialised=0; if ((s->cur_file_info.compression_method!=0) && (s->cur_file_info.compression_method!=Z_DEFLATED)) err=UNZ_BADZIPFILE; Store = s->cur_file_info.compression_method==0;

pfile_in_zip_read_info->crc32_wait=s->cur_file_info.crc; pfile_in_zip_read_info->crc32=0; pfile_in_zip_read_info->compression_method = s->cur_file_info.compression_method; pfile_in_zip_read_info->file=s->file; pfile_in_zip_read_info->byte_before_the_zipfile=s->byte_before_the_zipfile;

pfile_in_zip_read_info->stream.total_out = 0;

if (!Store) { pfile_in_zip_read_info->stream.zalloc = (alloc_func)0; pfile_in_zip_read_info->stream.zfree = (free_func)0; pfile_in_zip_read_info->stream.opaque = (voidpf)0; err=inflateInit2(&pfile_in_zip_read_info->stream, -MAX_WBITS); if (err == Z_OK) pfile_in_zip_read_info->stream_initialised=1; /* windowBits is passed < 0 to tell that there is no zlib header. * Note that in this case inflate *requires* an extra "dummy" byte * after the compressed stream in order to complete decompression and * return Z_STREAM_END. * In unzip, i don't wait absolutely Z_STREAM_END because I known the * size of both compressed and uncompressed data */ } pfile_in_zip_read_info->rest_read_compressed = s->cur_file_info.compressed_size ; pfile_in_zip_read_info->rest_read_uncompressed = s->cur_file_info.uncompressed_size ;

pfile_in_zip_read_info->pos_in_zipfile = s->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER + iSizeVar; pfile_in_zip_read_info->stream.avail_in = (uInt)0;

s->pfile_in_zip_read = pfile_in_zip_read_info; return UNZ_OK; }

/* Read bytes from the current file. buf contain buffer where data must be copied len the size of buf.

return the number of byte copied if somes bytes are copied return 0 if the end of file was reached return <0 with error code if there is an error (UNZ_ERRNO for IO error, or zLib error for uncompress error) */
extern int ZEXPORT unzReadCurrentFile (unzFile file, voidp buf, unsigned len) { int err=UNZ_OK; uInt iRead = 0; unz_s* s; file_in_zip_read_info_s* pfile_in_zip_read_info; if (!file) return UNZ_PARAMERROR; s=(unz_s*)file; pfile_in_zip_read_info=s->pfile_in_zip_read;

if (!pfile_in_zip_read_info) return UNZ_PARAMERROR;

if ((!pfile_in_zip_read_info->read_buffer)) return UNZ_END_OF_LIST_OF_FILE; if (!len) return 0;

pfile_in_zip_read_info->stream.next_out = (Bytef*)buf;

pfile_in_zip_read_info->stream.avail_out = (uInt)len; if (len>pfile_in_zip_read_info->rest_read_uncompressed) pfile_in_zip_read_info->stream.avail_out = (uInt)pfile_in_zip_read_info->rest_read_uncompressed;

while (pfile_in_zip_read_info->stream.avail_out>0) { if ((pfile_in_zip_read_info->stream.avail_in==0) && (pfile_in_zip_read_info->rest_read_compressed>0)) { uInt uReadThis = UNZ_BUFSIZE; if (pfile_in_zip_read_info->rest_read_compressed<uReadThis) uReadThis = (uInt)pfile_in_zip_read_info->rest_read_compressed; if (!uReadThis) return UNZ_EOF; if (fseek(pfile_in_zip_read_info->file, pfile_in_zip_read_info->pos_in_zipfile + pfile_in_zip_read_info->byte_before_the_zipfile,SEEK_SET)!=0) return UNZ_ERRNO; if (fread(pfile_in_zip_read_info->read_buffer,uReadThis,1,pfile_in_zip_read_info->file)!=1) return UNZ_ERRNO; pfile_in_zip_read_info->pos_in_zipfile += uReadThis;

pfile_in_zip_read_info->rest_read_compressed-=uReadThis; pfile_in_zip_read_info->stream.next_in = (Bytef*)pfile_in_zip_read_info->read_buffer; pfile_in_zip_read_info->stream.avail_in = (uInt)uReadThis; }

if (pfile_in_zip_read_info->compression_method==0) { uInt uDoCopy,i ; if (pfile_in_zip_read_info->stream.avail_out < pfile_in_zip_read_info->stream.avail_in) uDoCopy = pfile_in_zip_read_info->stream.avail_out ; else uDoCopy = pfile_in_zip_read_info->stream.avail_in ; for (i=0;i<uDoCopy;i++) *(pfile_in_zip_read_info->stream.next_out+i) = *(pfile_in_zip_read_info->stream.next_in+i); pfile_in_zip_read_info->crc32 = crc32(pfile_in_zip_read_info->crc32, pfile_in_zip_read_info->stream.next_out, uDoCopy); pfile_in_zip_read_info->rest_read_uncompressed-=uDoCopy; pfile_in_zip_read_info->stream.avail_in -= uDoCopy; pfile_in_zip_read_info->stream.avail_out -= uDoCopy; pfile_in_zip_read_info->stream.next_out += uDoCopy; pfile_in_zip_read_info->stream.next_in += uDoCopy; pfile_in_zip_read_info->stream.total_out += uDoCopy; iRead += uDoCopy; } else { uLong uTotalOutBefore,uTotalOutAfter; const Bytef *bufBefore; uLong uOutThis; int flush=Z_SYNC_FLUSH;

uTotalOutBefore = pfile_in_zip_read_info->stream.total_out; bufBefore = pfile_in_zip_read_info->stream.next_out;

err=inflate(&pfile_in_zip_read_info->stream,flush);

uTotalOutAfter = pfile_in_zip_read_info->stream.total_out; uOutThis = uTotalOutAfter-uTotalOutBefore; pfile_in_zip_read_info->crc32 = crc32(pfile_in_zip_read_info->crc32,bufBefore, (uInt)(uOutThis));

pfile_in_zip_read_info->rest_read_uncompressed -= uOutThis;

iRead += (uInt)(uTotalOutAfter - uTotalOutBefore); if (err==Z_STREAM_END) return (iRead==0) ? UNZ_EOF : iRead; if (err!=Z_OK) break; } }

if (err==Z_OK) return iRead; return err; }

/* Give the current position in uncompressed data */ extern z_off_t ZEXPORT unztell (unzFile file) { unz_s* s; file_in_zip_read_info_s* pfile_in_zip_read_info; if (!file) return UNZ_PARAMERROR; s=(unz_s*)file; pfile_in_zip_read_info=s->pfile_in_zip_read;

if (!pfile_in_zip_read_info) return UNZ_PARAMERROR;

return (z_off_t)pfile_in_zip_read_info->stream.total_out; }

/* return 1 if the end of file was reached, 0 elsewhere */ extern int ZEXPORT unzeof (unzFile file) { unz_s* s; file_in_zip_read_info_s* pfile_in_zip_read_info; if (!file) return UNZ_PARAMERROR; s=(unz_s*)file; pfile_in_zip_read_info=s->pfile_in_zip_read;

if (!pfile_in_zip_read_info) return UNZ_PARAMERROR; if (pfile_in_zip_read_info->rest_read_uncompressed == 0) return 1; else return 0; }



/* Read extra field from the current file (opened by unzOpenCurrentFile) This is the local-header version of the extra field (sometimes, there is more info in the local-header version than in the central-header)

if buf==NULL, it return the size of the local extra field that can be read

if buf!=NULL, len is the size of the buffer, the extra header is copied in buf. the return value is the number of bytes copied in buf, or (if <0) the error code */
extern int ZEXPORT unzGetLocalExtrafield (unzFile file,voidp buf,unsigned len) { unz_s* s; file_in_zip_read_info_s* pfile_in_zip_read_info; uInt read_now; uLong size_to_read;

if (!file) return UNZ_PARAMERROR; s=(unz_s*)file; pfile_in_zip_read_info=s->pfile_in_zip_read;

if (!pfile_in_zip_read_info) return UNZ_PARAMERROR;

size_to_read = (pfile_in_zip_read_info->size_local_extrafield - pfile_in_zip_read_info->pos_local_extrafield);

if (!buf) return (int)size_to_read; if (len>size_to_read) read_now = (uInt)size_to_read; else read_now = (uInt)len ;

if (!read_now) return 0; if (fseek(pfile_in_zip_read_info->file, pfile_in_zip_read_info->offset_local_extrafield + pfile_in_zip_read_info->pos_local_extrafield,SEEK_SET)!=0) return UNZ_ERRNO;

if (fread(buf,(uInt)size_to_read,1,pfile_in_zip_read_info->file)!=1) return UNZ_ERRNO;

return (int)read_now; }

/* Close the file in zip opened with unzipOpenCurrentFile Return UNZ_CRCERROR if all the file was read but the CRC is not good */ extern int ZEXPORT unzCloseCurrentFile (unzFile file) { int err=UNZ_OK;

unz_s* s; file_in_zip_read_info_s* pfile_in_zip_read_info; if (!file) return UNZ_PARAMERROR; s=(unz_s*)file; pfile_in_zip_read_info=s->pfile_in_zip_read;

if (!pfile_in_zip_read_info) return UNZ_PARAMERROR;

if (!pfile_in_zip_read_info->rest_read_uncompressed) { if (pfile_in_zip_read_info->crc32 != pfile_in_zip_read_info->crc32_wait) err=UNZ_CRCERROR; }

TRYFREE(pfile_in_zip_read_info->read_buffer); pfile_in_zip_read_info->read_buffer = NULL; if (pfile_in_zip_read_info->stream_initialised) inflateEnd(&pfile_in_zip_read_info->stream);

pfile_in_zip_read_info->stream_initialised = 0; TRYFREE(pfile_in_zip_read_info);

s->pfile_in_zip_read=NULL;

return err; }

/* Get the global comment string of the ZipFile, in the szComment buffer. uSizeBuf is the size of the szComment buffer. return the number of byte copied or an error code <0 */ extern int ZEXPORT unzGetGlobalComment (unzFile file, char *szComment, uLong uSizeBuf) { int err=UNZ_OK; unz_s* s; uLong uReadThis ; if (!file) return UNZ_PARAMERROR; s=(unz_s*)file;

uReadThis = uSizeBuf; if (uReadThis>s->gi.size_comment) uReadThis = s->gi.size_comment;

if (fseek(s->file,s->central_pos+22,SEEK_SET)!=0) return UNZ_ERRNO;

if (uReadThis>0) { *szComment='\0'; if (fread(szComment,(uInt)uReadThis,1,s->file)!=1) return UNZ_ERRNO; }

if ((szComment != NULL) && (uSizeBuf > s->gi.size_comment)) *(szComment+s->gi.size_comment)='\0'; return (int)uReadThis; }

Currently browsing [vfs.zip] (55,494 bytes) - [filesystem.cpp] - (7,963 bytes)

/******************************************************************************/
/*  Virtual File System ZIP                                                   */
/*     -   Fredrik Redgård <mrfrippe@writeme.com>                             */
/******************************************************************************/

#include <windows.h> #include <string.h>

#include "filesystem.h" #include "unzip.h"

///////////////////////////////////////////////////////////////////////////////// //defines///////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////////////////// //local function prototypes////////////////////////////////////////////////////// int AddFoundFile( const char *path, LPWIN32_FIND_DATA info ); int FindFile( const char *filename ); unsigned long HashString(const char *string);

///////////////////////////////////////////////////////////////////////////////// //local types//////////////////////////////////////////////////////////////////// typedef struct { char *filename; unzFile file; } ZipFile;

typedef struct { char filename[256]; ZipFile *container;

unsigned long hash; unsigned long filesize; int num; int pos;

unsigned long dos_date;

} FileItem;

///////////////////////////////////////////////////////////////////////////////// //global variables/////////////////////////////////////////////////////////////// char *loose_files_path; unsigned int num_zipfiles; unsigned int num_files;

ZipFile *zipfiles; FileItem *files;

///////////////////////////////////////////////////////////////////////////////// //functions////////////////////////////////////////////////////////////////////// unsigned long HashString(const char *string) { unsigned long result = 0; int place = 0; while (*string) { char string_value = isupper(*string) ? tolower(*string) : *string; result += (string_value << (place * 8)); string++; place++; if (place > 3) place = 0; } return result; }

int FindFile( const char *filename ) { unsigned int i; unsigned long hash = HashString(filename); unsigned long hash_l = HashString("file.txt"); unsigned long hash_u = HashString("File.txt");

for (i=0; i<num_files; i++) { if (files[i].hash == hash) { if (!_stricmp(files[i].filename, filename)) { return i; } } }

return -1; }

unsigned long vfsGetFileSize( const char *filename ) { if (loose_files_path) { //first look for loose files char *loose_name; int len = strlen(loose_files_path) + strlen(filename)+1; loose_name = (char *)malloc(len); strcpy(loose_name, loose_files_path); strcpy(loose_name+strlen(loose_name),filename);

HANDLE lf; lf = CreateFile(loose_name, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL); if ((lf==0) || (lf==INVALID_HANDLE_VALUE)) { } else { unsigned long ret = GetFileSize(lf, NULL); CloseHandle(lf); free(loose_name); return ret; } free(loose_name); }

int find = FindFile(filename); if (find == -1) return 0;

return files[find].filesize; }

unsigned long vfsLoadFileIntoBuffer( const char *filename, void *buffer, unsigned long buffer_size ) { //NOTE: the buffer should allready be allocated. use vfsGetFileSize to get required size. if (loose_files_path) { //loose files char *loose_name; int len = strlen(loose_files_path) + strlen(filename)+1; loose_name = (char *)malloc(len); strcpy(loose_name, loose_files_path); strcpy(loose_name+strlen(loose_name),filename);

HANDLE lf; lf = CreateFile(loose_name, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL); if ((lf==0) || (lf==INVALID_HANDLE_VALUE)) { } else { unsigned long lf_read; unsigned long ret = GetFileSize(lf, NULL); ReadFile(lf, buffer, ret, &lf_read, NULL); CloseHandle(lf); free(loose_name); return lf_read; } free(loose_name); }

int find = FindFile(filename); if (find == -1) return 0;

unzLocateFileMy( files[find].container->file, files[find].num, files[find].pos); unzOpenCurrentFile( files[find].container->file); unsigned long read = unzReadCurrentFile( files[find].container->file, buffer, buffer_size); unzCloseCurrentFile( files[find].container->file );

return read; }

int vfsBootup() { loose_files_path = 0; num_zipfiles = 0; num_files = 0;

files = 0; zipfiles = 0;

return 1; }

void vfsShutdown() { unsigned int i;

for (i=0; i<num_zipfiles; i++) { unzClose(zipfiles[i].file); // free(zipfiles[i].filename); why can't I free this }

free(files); }

int vfsAddPackfileSearchDir( const char *path ) { HANDLE file_search; WIN32_FIND_DATA fd; int found_files = 0;

char *buffer = new char[strlen(path)+10];

memcpy(buffer, path, strlen(path)+1); strcat(buffer, "*.zip");

file_search = FindFirstFile( buffer, &fd ); if (file_search == INVALID_HANDLE_VALUE) { DWORD error = GetLastError(); return 0; } found_files+=AddFoundFile( path, &fd );

while (FindNextFile( file_search, &fd )) { found_files+=AddFoundFile( path, &fd ); } FindClose(file_search);

return found_files; }

int AddFoundFile( const char *path, LPWIN32_FIND_DATA info ) { unsigned int i,j;

////// get file name ////////// char *zipfilename; int zfn_len; zfn_len = strlen(path) + strlen(info->cFileName);

zipfilename = (char*)malloc( zfn_len ); strcpy(zipfilename, path); strcpy(zipfilename+strlen(path), info->cFileName);

////// Add zip to list ////// for (i=0; i< num_zipfiles; i++) { if (!_stricmp( zipfiles[i].filename, zipfilename)!=0) return 0; }

////// open it up /////////// unzFile f = unzOpen(zipfilename); if (f==0) return 0;

if (zipfiles == 0) zipfiles = (ZipFile*)malloc(sizeof(ZipFile)); else zipfiles = (ZipFile*)realloc(zipfiles,sizeof(ZipFile)*(num_zipfiles+1));

zipfiles[num_zipfiles].filename = zipfilename; zipfiles[num_zipfiles].file = f;

num_zipfiles++;

/////// Get File info /////// unz_global_info ugi; unzGetGlobalInfo(f, &ugi);

if (files == 0) files = (FileItem*)malloc(sizeof(FileItem) * ugi.number_entry); else files = (FileItem*)realloc(files, sizeof(FileItem) * (num_files + ugi.number_entry)); //it doesn't matter if there are file extra spaces allocated, since the next realloc would //just make enough free file spaces to fit in the new files for (i=0; i<ugi.number_entry; i++) { char *filename = (char*)malloc(256); unz_file_info ufi; unzGetCurrentFileInfo(f, &ufi, filename, 255, NULL, 0, NULL, 0);

for (j=0; j<num_files; j++) { if (!_stricmp(filename, files[j].filename)) { if (ufi.dosDate > files[j].dos_date) //newer file, replace { //strcpy(files[j].filename, filename); files[j].num = i; files[j].pos = ufi.c_offset; files[j].dos_date = ufi.dosDate; files[j].filesize = ufi.uncompressed_size; files[j].container = &zipfiles[num_zipfiles-1]; files[j].hash = HashString(filename); } goto next_file; } } // new file, add it strcpy(files[num_files].filename, filename); files[num_files].num = i; files[num_files].pos = ufi.c_offset; files[num_files].dos_date = ufi.dosDate; files[num_files].filesize = ufi.uncompressed_size; files[num_files].container = &zipfiles[num_zipfiles-1]; files[j].hash = HashString(filename); num_files++;

next_file: free(filename); unzGoToNextFile(f); }

return 1; }

int vfsSetLooseFilesBaseDir( const char *path ) { int len = strlen(path);

if (loose_files_path) free(loose_files_path);

loose_files_path = (char *)malloc(len+1); strcpy(loose_files_path, path); loose_files_path[len] = 0;

return 1; }

Currently browsing [vfs.zip] (55,494 bytes) - [filesystem.h] - (2,342 bytes)

/******************************************************************************/
/*  Virtual File System ZIP header file                                       */
/*     -   Fredrik Redgård <mrfrippe@writeme.com>                             */
/******************************************************************************/
//
// Tools to load files from zip files
// NOTE: filenames are case sensitive
//

#ifndef _FILESYSTEM_H_INCLUDED
#define _FILESYSTEM_H_INCLUDED

//////////////////////////////////////////////////// // vfsGetFileSize // // Search for filename in the packfiles // and return the file size if file is found // if no file is found, vfsGetFileSize returns 0. // unsigned long vfsGetFileSize( const char *filename );

//////////////////////////////////////////////////// // vfsLoadFileIntoBuffer // // Reads the contents of the file into the buffer // return value is the number of bytes put into // the buffer. // If the function fails, it returns 0. // // The buffer should allready be allocated, and // buffersize should be how big the buffer is // vfsLoadFileIntoBuffer will try to fill the // buffer. // unsigned long vfsLoadFileIntoBuffer( const char *filename, void *buffer, unsigned long buffer_size );

//////////////////////////////////////////////////// // vfsBootup // // Initializes all internal structures. // call this before using any other VFS function. // If bootup is successfull, vfsBootup returns 1. // int vfsBootup();

//////////////////////////////////////////////////// // vfsShutdown // // Frees all internally used memory, closes open // files etc. // Call this before closing the program // void vfsShutdown();

//////////////////////////////////////////////////// // vfsAddPackfileSearchDir // // Initializes all packfiles in the specified dir // to be ready for file access // return value is the number of packfiles added // int vfsAddPackfileSearchDir( const char *path );

//////////////////////////////////////////////////// // vfsSetLooseFilesBaseDir // // Initializes all packfiles in the specified dir // to be ready for file access // return value is the number of packfiles added // int vfsSetLooseFilesBaseDir( const char *path );

#endif //_FILESYSTEM_H_INCLUDED

Currently browsing [vfs.zip] (55,494 bytes) - [main.cpp] - (2,020 bytes)

/******************************************************************************/
/*  Virtual File System Test Program                                          */
/*     -   Fredrik Redgård <mrfrippe@writeme.com>                             */
/******************************************************************************/

// // Using the VFS is very easy: // // 1) vfsBootup(); - sets up some internal stuff // 2) vfsAddPackfileSearchDir(...); - search for zip files at this path // 3) vfsSetLooseFilesBaseDir(...); - optional, if you want to use loose files // 4) vfsGetFileSize(...); - tries to get the file size, use to allocate // file buffer // 5) vfsLoadFileIntoBuffer(...); - fills the buffer with the buffer_size first bytes // of the file // 6) vfsShutdown(); - release memory, and close files // // NOTE: Filenames are case sensitive // #include "filesystem.h"

#include <string.h>//strrchr #include <windows.h>//GetModuleFilename #include <stdio.h>//printf int main(int argc, char *argv[]) { vfsBootup(); char dir[_MAX_PATH]; GetModuleFileName(NULL, dir, 200);

dir[(strrchr( dir, '\\' )-dir)+1] = 0; //skip filename vfsAddPackfileSearchDir(dir); vfsSetLooseFilesBaseDir(dir);

unsigned long size = vfsGetFileSize("File.txt"); if (!size) { printf( "File.txt was not found in any zip file in the same dir as this exe\n" "or as a loose file in the same dir as this exe\n" ); return 1; }

char *buffer = new char[size+1]; //make room for a null unsigned long realsize = vfsLoadFileIntoBuffer("File.txt", buffer, size+1); if (!realsize) { printf( "An error occured when trying to get file contents, zip file may be currupt\n" ); return 1; } buffer[realsize] = 0;

printf( "File contents found:\n" "--------------------------------------------------------------------------------\n" ); printf("%s\n\n", buffer);

vfsShutdown(); return 0; }

Currently browsing [vfs.zip] (55,494 bytes) - [unzip.h] - (10,380 bytes)

/* unzip.h -- IO for uncompress .zip files using zlib 
   Version 0.15 beta, Mar 19th, 1998,

Copyright (C) 1998 Gilles Vollant

This unzip package allow extract file from .ZIP file, compatible with PKZip 2.04g WinZip, InfoZip tools and compatible. Encryption and multi volume ZipFile (span) are not supported. Old compressions used by old PKZip 1.x are not supported

THIS IS AN ALPHA VERSION. AT THIS STAGE OF DEVELOPPEMENT, SOMES API OR STRUCTURE CAN CHANGE IN FUTURE VERSION !! I WAIT FEEDBACK at mail info@winimage.com Visit also http://www.winimage.com/zLibDll/unzip.htm for evolution Condition of use and distribution are the same than zlib :

This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software.

Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. 3. This notice may not be removed or altered from any source distribution.

*/
/* for more info about .ZIP format, see ftp://ftp.cdrom.com/pub/infozip/doc/appnote-970311-iz.zip PkWare has also a specification at : ftp://ftp.pkware.com/probdesc.zip */ #ifndef _unz_H #define _unz_H

#ifdef __cplusplus extern "C" { #endif

#ifndef _ZLIB_H #include "zlib.h" #endif

#if defined(STRICTUNZIP) || defined(STRICTZIPUNZIP) /* like the STRICT of WIN32, we define a pointer that cannot be converted from (void*) without cast */ typedef struct TagunzFile__ { int unused; } unzFile__; typedef unzFile__ *unzFile; #else typedef voidp unzFile; #endif

#define UNZ_OK (0) #define UNZ_END_OF_LIST_OF_FILE (-100) #define UNZ_ERRNO (Z_ERRNO) #define UNZ_EOF (0) #define UNZ_PARAMERROR (-102) #define UNZ_BADZIPFILE (-103) #define UNZ_INTERNALERROR (-104) #define UNZ_CRCERROR (-105)

/* tm_unz contain date/time info */ //typedef struct tm_unz_s //{ // uInt tm_sec; /* seconds after the minute - [0,59] */ // uInt tm_min; /* minutes after the hour - [0,59] */ // uInt tm_hour; /* hours since midnight - [0,23] */ // uInt tm_mday; /* day of the month - [1,31] */ // uInt tm_mon; /* months since January - [0,11] */ // uInt tm_year; /* years - [1980..2044] */ //} tm_unz; /* unz_global_info structure contain global data about the ZIPfile These data comes from the end of central dir */ typedef struct unz_global_info_s { uLong number_entry; /* total number of entries in the central dir on this disk */ uLong size_comment; /* size of the global comment of the zipfile */ } unz_global_info;

/* unz_file_info contain information about a file in the zipfile */ #pragma pack(push, 1) typedef struct unz_file_info_s { uShort version; /* version made by 2 bytes */ uShort version_needed; /* version needed to extract 2 bytes */ uShort flag; /* general purpose bit flag 2 bytes */ uShort compression_method; /* compression method 2 bytes */ uLong dosDate; /* last mod file date in Dos fmt 4 bytes */ uLong crc; /* crc-32 4 bytes */ uLong compressed_size; /* compressed size 4 bytes */ uLong uncompressed_size; /* uncompressed size 4 bytes */ uShort size_filename; /* filename length 2 bytes */ uShort size_file_extra; /* extra field length 2 bytes */ uShort size_file_comment; /* file comment length 2 bytes */

uShort disk_num_start; /* disk number start 2 bytes */ uShort internal_fa; /* internal file attributes 2 bytes */ uLong external_fa; /* external file attributes 4 bytes */

// tm_unz tmu_date; uLong offset, c_offset; } unz_file_info; #pragma pack(pop) extern int ZEXPORT unzStringFileNameCompare OF ((const char* fileName1, const char* fileName2, int iCaseSensitivity)); /* Compare two filename (fileName1,fileName2). If iCaseSenisivity = 1, comparision is case sensitivity (like strcmp) If iCaseSenisivity = 2, comparision is not case sensitivity (like strcmpi or strcasecmp) If iCaseSenisivity = 0, case sensitivity is defaut of your operating system (like 1 on Unix, 2 on Windows) */

extern unzFile ZEXPORT unzOpen OF((const char *path)); /* Open a Zip file. path contain the full pathname (by example, on a Windows NT computer "c:\\zlib\\zlib111.zip" or on an Unix computer "zlib/zlib111.zip". If the zipfile cannot be opened (file don't exist or in not valid), the return value is NULL. Else, the return value is a unzFile Handle, usable with other function of this unzip package. */

extern int ZEXPORT unzClose OF((unzFile file)); /* Close a ZipFile opened with unzipOpen. If there is files inside the .Zip opened with unzOpenCurrentFile (see later), these files MUST be closed with unzipCloseCurrentFile before call unzipClose. return UNZ_OK if there is no problem. */

extern int ZEXPORT unzGetGlobalInfo OF((unzFile file, unz_global_info *pglobal_info)); /* Write info about the ZipFile in the *pglobal_info structure. No preparation of the structure is needed return UNZ_OK if there is no problem. */

extern int ZEXPORT unzGetGlobalComment OF((unzFile file, char *szComment, uLong uSizeBuf)); /* Get the global comment string of the ZipFile, in the szComment buffer. uSizeBuf is the size of the szComment buffer. return the number of byte copied or an error code <0 */

/***************************************************************************/ /* Unzip package allow you browse the directory of the zipfile */

extern int ZEXPORT unzGoToFirstFile OF((unzFile file)); /* Set the current file of the zipfile to the first file. return UNZ_OK if there is no problem */

extern int ZEXPORT unzGoToNextFile OF((unzFile file)); /* Set the current file of the zipfile to the next file. return UNZ_OK if there is no problem return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest. */

extern int ZEXPORT unzLocateFile OF((unzFile file, const char *szFileName, int iCaseSensitivity));

extern int ZEXPORT unzLocateFileMy OF((unzFile file, uLong num, uLong pos)); /* Try locate the file szFileName in the zipfile. For the iCaseSensitivity signification, see unzStringFileNameCompare

return value : UNZ_OK if the file is found. It becomes the current file. UNZ_END_OF_LIST_OF_FILE if the file is not found */


extern int ZEXPORT unzGetCurrentFileInfo OF((unzFile file, unz_file_info *pfile_info, char *szFileName, uLong fileNameBufferSize, void *extraField, uLong extraFieldBufferSize, char *szComment, uLong commentBufferSize)); /* Get Info about the current file if pfile_info!=NULL, the *pfile_info structure will contain somes info about the current file if szFileName!=NULL, the filemane string will be copied in szFileName (fileNameBufferSize is the size of the buffer) if extraField!=NULL, the extra field information will be copied in extraField (extraFieldBufferSize is the size of the buffer). This is the Central-header version of the extra field if szComment!=NULL, the comment string of the file will be copied in szComment (commentBufferSize is the size of the buffer) */

/***************************************************************************/ /* for reading the content of the current zipfile, you can open it, read data from it, and close it (you can close it before reading all the file) */

extern int ZEXPORT unzOpenCurrentFile OF((unzFile file)); /* Open for reading data the current file in the zipfile. If there is no error, the return value is UNZ_OK. */

extern int ZEXPORT unzCloseCurrentFile OF((unzFile file)); /* Close the file in zip opened with unzOpenCurrentFile Return UNZ_CRCERROR if all the file was read but the CRC is not good */

extern int ZEXPORT unzReadCurrentFile OF((unzFile file, voidp buf, unsigned len)); /* Read bytes from the current file (opened by unzOpenCurrentFile) buf contain buffer where data must be copied len the size of buf.

return the number of byte copied if somes bytes are copied return 0 if the end of file was reached return <0 with error code if there is an error (UNZ_ERRNO for IO error, or zLib error for uncompress error) */


extern z_off_t ZEXPORT unztell OF((unzFile file)); /* Give the current position in uncompressed data */

extern int ZEXPORT unzeof OF((unzFile file)); /* return 1 if the end of file was reached, 0 elsewhere */

extern int ZEXPORT unzGetLocalExtrafield OF((unzFile file, voidp buf, unsigned len)); /* Read extra field from the current file (opened by unzOpenCurrentFile) This is the local-header version of the extra field (sometimes, there is more info in the local-header version than in the central-header)

if buf==NULL, it return the size of the local extra field

if buf!=NULL, len is the size of the buffer, the extra header is copied in buf. the return value is the number of bytes copied in buf, or (if <0) the error code */


#ifdef __cplusplus } #endif

#endif /* _unz_H */

Currently browsing [vfs.zip] (55,494 bytes) - [zconf.h] - (8,121 bytes)

/* zconf.h -- configuration of the zlib compression library
 * Copyright (C) 1995-1998 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */

/* @(#) $Id$ */

#ifndef _ZCONF_H #define _ZCONF_H

/* * If you *really* need a unique prefix for all types and library functions, * compile with -DZ_PREFIX. The "standard" zlib should be compiled without it. */ #ifdef Z_PREFIX # define deflateInit_ z_deflateInit_ # define deflate z_deflate # define deflateEnd z_deflateEnd # define inflateInit_ z_inflateInit_ # define inflate z_inflate # define inflateEnd z_inflateEnd # define deflateInit2_ z_deflateInit2_ # define deflateSetDictionary z_deflateSetDictionary # define deflateCopy z_deflateCopy # define deflateReset z_deflateReset # define deflateParams z_deflateParams # define inflateInit2_ z_inflateInit2_ # define inflateSetDictionary z_inflateSetDictionary # define inflateSync z_inflateSync # define inflateSyncPoint z_inflateSyncPoint # define inflateReset z_inflateReset # define compress z_compress # define compress2 z_compress2 # define uncompress z_uncompress # define adler32 z_adler32 # define crc32 z_crc32 # define get_crc_table z_get_crc_table

# define Byte z_Byte # define uInt z_uInt # define uLong z_uLong # define Bytef z_Bytef # define charf z_charf # define intf z_intf # define uIntf z_uIntf # define uLongf z_uLongf # define voidpf z_voidpf # define voidp z_voidp #endif

#if (defined(_WIN32) || defined(__WIN32__)) && !defined(WIN32) # define WIN32 #endif #if defined(__GNUC__) || defined(WIN32) || defined(__386__) || defined(i386) # ifndef __32BIT__ # define __32BIT__ # endif #endif #if defined(__MSDOS__) && !defined(MSDOS) # define MSDOS #endif

/* * Compile with -DMAXSEG_64K if the alloc function cannot allocate more * than 64k bytes at a time (needed on systems with 16-bit int). */ #if defined(MSDOS) && !defined(__32BIT__) # define MAXSEG_64K #endif #ifdef MSDOS # define UNALIGNED_OK #endif

#if (defined(MSDOS) || defined(_WINDOWS) || defined(WIN32)) && !defined(STDC) # define STDC #endif #if defined(__STDC__) || defined(__cplusplus) || defined(__OS2__) # ifndef STDC # define STDC # endif #endif

#ifndef STDC # ifndef const /* cannot use !defined(STDC) && !defined(const) on Mac */ # define const # endif #endif

/* Some Mac compilers merge all .h files incorrectly: */ #if defined(__MWERKS__) || defined(applec) ||defined(THINK_C) ||defined(__SC__) # define NO_DUMMY_DECL #endif

/* Old Borland C incorrectly complains about missing returns: */ #if defined(__BORLANDC__) && (__BORLANDC__ < 0x500) # define NEED_DUMMY_RETURN #endif

/* Maximum value for memLevel in deflateInit2 */ #ifndef MAX_MEM_LEVEL # ifdef MAXSEG_64K # define MAX_MEM_LEVEL 8 # else # define MAX_MEM_LEVEL 9 # endif #endif

/* Maximum value for windowBits in deflateInit2 and inflateInit2. * WARNING: reducing MAX_WBITS makes minigzip unable to extract .gz files * created by gzip. (Files created by minigzip can still be extracted by * gzip.) */ #ifndef MAX_WBITS # define MAX_WBITS 15 /* 32K LZ77 window */ #endif

/* The memory requirements for deflate are (in bytes): (1 << (windowBits+2)) + (1 << (memLevel+9)) that is: 128K for windowBits=15 + 128K for memLevel = 8 (default values) plus a few kilobytes for small objects. For example, if you want to reduce the default memory requirements from 256K to 128K, compile with make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7" Of course this will generally degrade compression (there's no free lunch).

The memory requirements for inflate are (in bytes) 1 << windowBits that is, 32K for windowBits=15 (default value) plus a few kilobytes for small objects. */


/* Type declarations */

#ifndef OF /* function prototypes */ # ifdef STDC # define OF(args) args # else # define OF(args) () # endif #endif

/* The following definitions for FAR are needed only for MSDOS mixed * model programming (small or medium model with some far allocations). * This was tested only with MSC; for other MSDOS compilers you may have * to define NO_MEMCPY in zutil.h. If you don't need the mixed model, * just define FAR to be empty. */ #if (defined(M_I86SM) || defined(M_I86MM)) && !defined(__32BIT__) /* MSC small or medium model */ # define SMALL_MEDIUM # ifdef _MSC_VER # define FAR _far # else # define FAR far # endif #endif #if defined(__BORLANDC__) && (defined(__SMALL__) || defined(__MEDIUM__)) # ifndef __32BIT__ # define SMALL_MEDIUM # define FAR _far # endif #endif

/* Compile with -DZLIB_DLL for Windows DLL support */ #if defined(ZLIB_DLL) # if defined(_WINDOWS) || defined(WINDOWS) # ifdef FAR # undef FAR # endif # include <windows.h> # define ZEXPORT WINAPI # ifdef WIN32 # define ZEXPORTVA WINAPIV # else # define ZEXPORTVA FAR _cdecl _export # endif # endif # if defined (__BORLANDC__) # if (__BORLANDC__ >= 0x0500) && defined (WIN32) # include <windows.h> # define ZEXPORT __declspec(dllexport) WINAPI # define ZEXPORTRVA __declspec(dllexport) WINAPIV # else # if defined (_Windows) && defined (__DLL__) # define ZEXPORT _export # define ZEXPORTVA _export # endif # endif # endif #endif

#if defined (__BEOS__) # if defined (ZLIB_DLL) # define ZEXTERN extern __declspec(dllexport) # else # define ZEXTERN extern __declspec(dllimport) # endif #endif

#ifndef ZEXPORT # define ZEXPORT #endif #ifndef ZEXPORTVA # define ZEXPORTVA #endif #ifndef ZEXTERN # define ZEXTERN extern #endif

#ifndef FAR # define FAR #endif

#if !defined(MACOS) && !defined(TARGET_OS_MAC) typedef unsigned char Byte; /* 8 bits */ #endif typedef unsigned int uInt; /* 16 bits or more */ typedef unsigned long uLong; /* 32 bits or more */ typedef unsigned short uShort;

#ifdef SMALL_MEDIUM /* Borland C/C++ and some old MSC versions ignore FAR inside typedef */ # define Bytef Byte FAR #else typedef Byte FAR Bytef; #endif typedef char FAR charf; typedef int FAR intf; typedef uInt FAR uIntf; typedef uLong FAR uLongf;

#ifdef STDC typedef void FAR *voidpf; typedef void *voidp; #else typedef Byte FAR *voidpf; typedef Byte *voidp; #endif

#ifdef HAVE_UNISTD_H # include <sys/types.h> /* for off_t */ # include <unistd.h> /* for SEEK_* and off_t */ # define z_off_t off_t #endif #ifndef SEEK_SET # define SEEK_SET 0 /* Seek from beginning of file. */ # define SEEK_CUR 1 /* Seek from current position. */ # define SEEK_END 2 /* Set file pointer to EOF plus "offset" */ #endif #ifndef z_off_t # define z_off_t long #endif

/* MVS linker does not support external names larger than 8 bytes */ #if defined(__MVS__) # pragma map(deflateInit_,"DEIN") # pragma map(deflateInit2_,"DEIN2") # pragma map(deflateEnd,"DEEND") # pragma map(inflateInit_,"ININ") # pragma map(inflateInit2_,"ININ2") # pragma map(inflateEnd,"INEND") # pragma map(inflateSync,"INSY") # pragma map(inflateSetDictionary,"INSEDI") # pragma map(inflate_blocks,"INBL") # pragma map(inflate_blocks_new,"INBLNE") # pragma map(inflate_blocks_free,"INBLFR") # pragma map(inflate_blocks_reset,"INBLRE") # pragma map(inflate_codes_free,"INCOFR") # pragma map(inflate_codes,"INCO") # pragma map(inflate_fast,"INFA") # pragma map(inflate_flush,"INFLU") # pragma map(inflate_mask,"INMA") # pragma map(inflate_set_dictionary,"INSEDI2") # pragma map(inflate_copyright,"INCOPY") # pragma map(inflate_trees_bits,"INTRBI") # pragma map(inflate_trees_dynamic,"INTRDY") # pragma map(inflate_trees_fixed,"INTRFI") # pragma map(inflate_trees_free,"INTRFR") #endif

#endif /* _ZCONF_H */

Currently browsing [vfs.zip] (55,494 bytes) - [zlib.h] - (41,791 bytes)

/* zlib.h -- interface of the 'zlib' general purpose compression library
  version 1.1.3, July 9th, 1998

Copyright (C) 1995-1998 Jean-loup Gailly and Mark Adler

This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software.

Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. 3. This notice may not be removed or altered from any source distribution.

Jean-loup Gailly Mark Adler jloup@gzip.org madler@alumni.caltech.edu

The data format used by the zlib library is described by RFCs (Request for Comments) 1950 to 1952 in the files ftp://ds.internic.net/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format). */


#ifndef _ZLIB_H #define _ZLIB_H

#include "zconf.h"

#ifdef __cplusplus extern "C" { #endif

#define ZLIB_VERSION "1.1.3"

/* The 'zlib' compression library provides in-memory compression and decompression functions, including integrity checks of the uncompressed data. This version of the library supports only one compression method (deflation) but other algorithms will be added later and will have the same stream interface.

Compression can be done in a single step if the buffers are large enough (for example if an input file is mmap'ed), or can be done by repeated calls of the compression function. In the latter case, the application must provide more input and/or consume the output (providing more output space) before each call.

The library also supports reading and writing files in gzip (.gz) format with an interface similar to that of stdio.

The library does not install any signal handler. The decoder checks the consistency of the compressed data, so the library should never crash even in case of corrupted input. */


typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size)); typedef void (*free_func) OF((voidpf opaque, voidpf address));

struct internal_state;

typedef struct z_stream_s { Bytef *next_in; /* next input byte */ uInt avail_in; /* number of bytes available at next_in */ uLong total_in; /* total nb of input bytes read so far */

Bytef *next_out; /* next output byte should be put there */ uInt avail_out; /* remaining free space at next_out */ uLong total_out; /* total nb of bytes output so far */

char *msg; /* last error message, NULL if no error */ struct internal_state FAR *state; /* not visible by applications */

alloc_func zalloc; /* used to allocate the internal state */ free_func zfree; /* used to free the internal state */ voidpf opaque; /* private data object passed to zalloc and zfree */

int data_type; /* best guess about the data type: ascii or binary */ uLong adler; /* adler32 value of the uncompressed data */ uLong reserved; /* reserved for future use */ } z_stream;

typedef z_stream FAR *z_streamp;

/* The application must update next_in and avail_in when avail_in has dropped to zero. It must update next_out and avail_out when avail_out has dropped to zero. The application must initialize zalloc, zfree and opaque before calling the init function. All other fields are set by the compression library and must not be updated by the application.

The opaque value provided by the application will be passed as the first parameter for calls of zalloc and zfree. This can be useful for custom memory management. The compression library attaches no meaning to the opaque value.

zalloc must return Z_NULL if there is not enough memory for the object. If zlib is used in a multi-threaded application, zalloc and zfree must be thread safe.

On 16-bit systems, the functions zalloc and zfree must be able to allocate exactly 65536 bytes, but will not be required to allocate more than this if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS, pointers returned by zalloc for objects of exactly 65536 bytes *must* have their offset normalized to zero. The default allocation function provided by this library ensures this (see zutil.c). To reduce memory requirements and avoid any allocation of 64K objects, at the expense of compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h).

The fields total_in and total_out can be used for statistics or progress reports. After compression, total_in holds the total size of the uncompressed data and may be saved for use in the decompressor (particularly if the decompressor wants to decompress everything in a single step). */


/* constants */

#define Z_NO_FLUSH 0 #define Z_PARTIAL_FLUSH 1 /* will be removed, use Z_SYNC_FLUSH instead */ #define Z_SYNC_FLUSH 2 #define Z_FULL_FLUSH 3 #define Z_FINISH 4 /* Allowed flush values; see deflate() below for details */

#define Z_OK 0 #define Z_STREAM_END 1 #define Z_NEED_DICT 2 #define Z_ERRNO (-1) #define Z_STREAM_ERROR (-2) #define Z_DATA_ERROR (-3) #define Z_MEM_ERROR (-4) #define Z_BUF_ERROR (-5) #define Z_VERSION_ERROR (-6) /* Return codes for the compression/decompression functions. Negative * values are errors, positive values are used for special but normal events. */

#define Z_NO_COMPRESSION 0 #define Z_BEST_SPEED 1 #define Z_BEST_COMPRESSION 9 #define Z_DEFAULT_COMPRESSION (-1) /* compression levels */

#define Z_FILTERED 1 #define Z_HUFFMAN_ONLY 2 #define Z_DEFAULT_STRATEGY 0 /* compression strategy; see deflateInit2() below for details */

#define Z_BINARY 0 #define Z_ASCII 1 #define Z_UNKNOWN 2 /* Possible values of the data_type field */

#define Z_DEFLATED 8 /* The deflate compression method (the only one supported in this version) */

#define Z_NULL 0 /* for initializing zalloc, zfree, opaque */

#define zlib_version zlibVersion() /* for compatibility with versions < 1.0.2 */

/* basic functions */

ZEXTERN const char * ZEXPORT zlibVersion OF((void)); /* The application can compare zlibVersion and ZLIB_VERSION for consistency. If the first character differs, the library code actually used is not compatible with the zlib.h header file used by the application. This check is automatically made by deflateInit and inflateInit. */

/* ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level));

Initializes the internal stream state for compression. The fields zalloc, zfree and opaque must be initialized before by the caller. If zalloc and zfree are set to Z_NULL, deflateInit updates them to use default allocation functions.

The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9: 1 gives best speed, 9 gives best compression, 0 gives no compression at all (the input data is simply copied a block at a time). Z_DEFAULT_COMPRESSION requests a default compromise between speed and compression (currently equivalent to level 6).

deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough memory, Z_STREAM_ERROR if level is not a valid compression level, Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible with the version assumed by the caller (ZLIB_VERSION). msg is set to null if there is no error message. deflateInit does not perform any compression: this will be done by deflate(). */


ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush)); /* deflate compresses as much data as possible, and stops when the input buffer becomes empty or the output buffer becomes full. It may introduce some output latency (reading input without producing any output) except when forced to flush.

The detailed semantics are as follows. deflate performs one or both of the following actions:

- Compress more input starting at next_in and update next_in and avail_in accordingly. If not all input can be processed (because there is not enough room in the output buffer), next_in and avail_in are updated and processing will resume at this point for the next call of deflate().

- Provide more output starting at next_out and update next_out and avail_out accordingly. This action is forced if the parameter flush is non zero. Forcing flush frequently degrades the compression ratio, so this parameter should be set only when necessary (in interactive applications). Some output may be provided even if flush is not set.

Before the call of deflate(), the application should ensure that at least one of the actions is possible, by providing more input and/or consuming more output, and updating avail_in or avail_out accordingly; avail_out should never be zero before the call. The application can consume the compressed output when it wants, for example when the output buffer is full (avail_out == 0), or after each call of deflate(). If deflate returns Z_OK and with zero avail_out, it must be called again after making room in the output buffer because there might be more output pending.

If the parameter flush is set to Z_SYNC_FLUSH, all pending output is flushed to the output buffer and the output is aligned on a byte boundary, so that the decompressor can get all input data available so far. (In particular avail_in is zero after the call if enough output space has been provided before the call.) Flushing may degrade compression for some compression algorithms and so it should be used only when necessary.

If flush is set to Z_FULL_FLUSH, all output is flushed as with Z_SYNC_FLUSH, and the compression state is reset so that decompression can restart from this point if previous compressed data has been damaged or if random access is desired. Using Z_FULL_FLUSH too often can seriously degrade the compression.

If deflate returns with avail_out == 0, this function must be called again with the same value of the flush parameter and more output space (updated avail_out), until the flush is complete (deflate returns with non-zero avail_out).

If the parameter flush is set to Z_FINISH, pending input is processed, pending output is flushed and deflate returns with Z_STREAM_END if there was enough output space; if deflate returns with Z_OK, this function must be called again with Z_FINISH and more output space (updated avail_out) but no more input data, until it returns with Z_STREAM_END or an error. After deflate has returned Z_STREAM_END, the only possible operations on the stream are deflateReset or deflateEnd. Z_FINISH can be used immediately after deflateInit if all the compression is to be done in a single step. In this case, avail_out must be at least 0.1% larger than avail_in plus 12 bytes. If deflate does not return Z_STREAM_END, then it must be called again as described above.

deflate() sets strm->adler to the adler32 checksum of all input read so far (that is, total_in bytes).

deflate() may update data_type if it can make a good guess about the input data type (Z_ASCII or Z_BINARY). In doubt, the data is considered binary. This field is only for information purposes and does not affect the compression algorithm in any manner.

deflate() returns Z_OK if some progress has been made (more input processed or more output produced), Z_STREAM_END if all input has been consumed and all output has been produced (only when flush is set to Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible (for example avail_in or avail_out was zero). */


ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm)); /* All dynamically allocated data structures for this stream are freed. This function discards any unprocessed input and does not flush any pending output.

deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state was inconsistent, Z_DATA_ERROR if the stream was freed prematurely (some input or output was discarded). In the error case, msg may be set but then points to a static string (which must not be deallocated). */


/* ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm));

Initializes the internal stream state for decompression. The fields next_in, avail_in, zalloc, zfree and opaque must be initialized before by the caller. If next_in is not Z_NULL and avail_in is large enough (the exact value depends on the compression method), inflateInit determines the compression method from the zlib header and allocates all data structures accordingly; otherwise the allocation will be deferred to the first call of inflate. If zalloc and zfree are set to Z_NULL, inflateInit updates them to use default allocation functions.

inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough memory, Z_VERSION_ERROR if the zlib library version is incompatible with the version assumed by the caller. msg is set to null if there is no error message. inflateInit does not perform any decompression apart from reading the zlib header if present: this will be done by inflate(). (So next_in and avail_in may be modified, but next_out and avail_out are unchanged.) */


ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush)); /* inflate decompresses as much data as possible, and stops when the input buffer becomes empty or the output buffer becomes full. It may some introduce some output latency (reading input without producing any output) except when forced to flush.

The detailed semantics are as follows. inflate performs one or both of the following actions:

- Decompress more input starting at next_in and update next_in and avail_in accordingly. If not all input can be processed (because there is not enough room in the output buffer), next_in is updated and processing will resume at this point for the next call of inflate().

- Provide more output starting at next_out and update next_out and avail_out accordingly. inflate() provides as much output as possible, until there is no more input data or no more space in the output buffer (see below about the flush parameter).

Before the call of inflate(), the application should ensure that at least one of the actions is possible, by providing more input and/or consuming more output, and updating the next_* and avail_* values accordingly. The application can consume the uncompressed output when it wants, for example when the output buffer is full (avail_out == 0), or after each call of inflate(). If inflate returns Z_OK and with zero avail_out, it must be called again after making room in the output buffer because there might be more output pending.

If the parameter flush is set to Z_SYNC_FLUSH, inflate flushes as much output as possible to the output buffer. The flushing behavior of inflate is not specified for values of the flush parameter other than Z_SYNC_FLUSH and Z_FINISH, but the current implementation actually flushes as much output as possible anyway.

inflate() should normally be called until it returns Z_STREAM_END or an error. However if all decompression is to be performed in a single step (a single call of inflate), the parameter flush should be set to Z_FINISH. In this case all pending input is processed and all pending output is flushed; avail_out must be large enough to hold all the uncompressed data. (The size of the uncompressed data may have been saved by the compressor for this purpose.) The next operation on this stream must be inflateEnd to deallocate the decompression state. The use of Z_FINISH is never required, but can be used to inform inflate that a faster routine may be used for the single inflate() call.

If a preset dictionary is needed at this point (see inflateSetDictionary below), inflate sets strm-adler to the adler32 checksum of the dictionary chosen by the compressor and returns Z_NEED_DICT; otherwise it sets strm->adler to the adler32 checksum of all output produced so far (that is, total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described below. At the end of the stream, inflate() checks that its computed adler32 checksum is equal to that saved by the compressor and returns Z_STREAM_END only if the checksum is correct.

inflate() returns Z_OK if some progress has been made (more input processed or more output produced), Z_STREAM_END if the end of the compressed data has been reached and all uncompressed output has been produced, Z_NEED_DICT if a preset dictionary is needed at this point, Z_DATA_ERROR if the input data was corrupted (input stream not conforming to the zlib format or incorrect adler32 checksum), Z_STREAM_ERROR if the stream structure was inconsistent (for example if next_in or next_out was NULL), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR if no progress is possible or if there was not enough room in the output buffer when Z_FINISH is used. In the Z_DATA_ERROR case, the application may then call inflateSync to look for a good compression block. */


ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm)); /* All dynamically allocated data structures for this stream are freed. This function discards any unprocessed input and does not flush any pending output.

inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state was inconsistent. In the error case, msg may be set but then points to a static string (which must not be deallocated). */


/* Advanced functions */

/* The following functions are needed only in some special applications. */

/* ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm, int level, int method, int windowBits, int memLevel, int strategy));

This is another version of deflateInit with more compression options. The fields next_in, zalloc, zfree and opaque must be initialized before by the caller.

The method parameter is the compression method. It must be Z_DEFLATED in this version of the library.

The windowBits parameter is the base two logarithm of the window size (the size of the history buffer). It should be in the range 8..15 for this version of the library. Larger values of this parameter result in better compression at the expense of memory usage. The default value is 15 if deflateInit is used instead.

The memLevel parameter specifies how much memory should be allocated for the internal compression state. memLevel=1 uses minimum memory but is slow and reduces compression ratio; memLevel=9 uses maximum memory for optimal speed. The default value is 8. See zconf.h for total memory usage as a function of windowBits and memLevel.

The strategy parameter is used to tune the compression algorithm. Use the value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a filter (or predictor), or Z_HUFFMAN_ONLY to force Huffman encoding only (no string match). Filtered data consists mostly of small values with a somewhat random distribution. In this case, the compression algorithm is tuned to compress them better. The effect of Z_FILTERED is to force more Huffman coding and less string matching; it is somewhat intermediate between Z_DEFAULT and Z_HUFFMAN_ONLY. The strategy parameter only affects the compression ratio but not the correctness of the compressed output even if it is not set appropriately.

deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as an invalid method). msg is set to null if there is no error message. deflateInit2 does not perform any compression: this will be done by deflate(). */
ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm, const Bytef *dictionary, uInt dictLength)); /* Initializes the compression dictionary from the given byte sequence without producing any compressed output. This function must be called immediately after deflateInit, deflateInit2 or deflateReset, before any call of deflate. The compressor and decompressor must use exactly the same dictionary (see inflateSetDictionary).

The dictionary should consist of strings (byte sequences) that are likely to be encountered later in the data to be compressed, with the most commonly used strings preferably put towards the end of the dictionary. Using a dictionary is most useful when the data to be compressed is short and can be predicted with good accuracy; the data can then be compressed better than with the default empty dictionary.

Depending on the size of the compression data structures selected by deflateInit or deflateInit2, a part of the dictionary may in effect be discarded, for example if the dictionary is larger than the window size in deflate or deflate2. Thus the strings most likely to be useful should be put at the end of the dictionary, not at the front.

Upon return of this function, strm->adler is set to the Adler32 value of the dictionary; the decompressor may later use this value to determine which dictionary has been used by the compressor. (The Adler32 value applies to the whole dictionary even if only a subset of the dictionary is actually used by the compressor.)

deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a parameter is invalid (such as NULL dictionary) or the stream state is inconsistent (for example if deflate has already been called for this stream or if the compression method is bsort). deflateSetDictionary does not perform any compression: this will be done by deflate(). */


ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest, z_streamp source)); /* Sets the destination stream as a complete copy of the source stream.

This function can be useful when several compression strategies will be tried, for example when there are several ways of pre-processing the input data with a filter. The streams that will be discarded should then be freed by calling deflateEnd. Note that deflateCopy duplicates the internal compression state which can be quite large, so this strategy is slow and can consume lots of memory.

deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not enough memory, Z_STREAM_ERROR if the source stream state was inconsistent (such as zalloc being NULL). msg is left unchanged in both source and destination. */


ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm)); /* This function is equivalent to deflateEnd followed by deflateInit, but does not free and reallocate all the internal compression state. The stream will keep the same compression level and any other attributes that may have been set by deflateInit2.

deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source stream state was inconsistent (such as zalloc or state being NULL). */


ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm, int level, int strategy)); /* Dynamically update the compression level and compression strategy. The interpretation of level and strategy is as in deflateInit2. This can be used to switch between compression and straight copy of the input data, or to switch to a different kind of input data requiring a different strategy. If the compression level is changed, the input available so far is compressed with the old level (and may be flushed); the new level will take effect only at the next call of deflate().

Before the call of deflateParams, the stream state must be set as for a call of deflate(), since the currently available input may have to be compressed and flushed. In particular, strm->avail_out must be non-zero.

deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR if strm->avail_out was zero. */


/* ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm, int windowBits));

This is another version of inflateInit with an extra parameter. The fields next_in, avail_in, zalloc, zfree and opaque must be initialized before by the caller.

The windowBits parameter is the base two logarithm of the maximum window size (the size of the history buffer). It should be in the range 8..15 for this version of the library. The default value is 15 if inflateInit is used instead. If a compressed stream with a larger window size is given as input, inflate() will return with the error code Z_DATA_ERROR instead of trying to allocate a larger window.

inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as a negative memLevel). msg is set to null if there is no error message. inflateInit2 does not perform any decompression apart from reading the zlib header if present: this will be done by inflate(). (So next_in and avail_in may be modified, but next_out and avail_out are unchanged.) */


ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm, const Bytef *dictionary, uInt dictLength)); /* Initializes the decompression dictionary from the given uncompressed byte sequence. This function must be called immediately after a call of inflate if this call returned Z_NEED_DICT. The dictionary chosen by the compressor can be determined from the Adler32 value returned by this call of inflate. The compressor and decompressor must use exactly the same dictionary (see deflateSetDictionary).

inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a parameter is invalid (such as NULL dictionary) or the stream state is inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the expected one (incorrect Adler32 value). inflateSetDictionary does not perform any decompression: this will be done by subsequent calls of inflate(). */


ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm)); /* Skips invalid compressed data until a full flush point (see above the description of deflate with Z_FULL_FLUSH) can be found, or until all available input is skipped. No output is provided.

inflateSync returns Z_OK if a full flush point has been found, Z_BUF_ERROR if no more input was provided, Z_DATA_ERROR if no flush point has been found, or Z_STREAM_ERROR if the stream structure was inconsistent. In the success case, the application may save the current current value of total_in which indicates where valid compressed data was found. In the error case, the application may repeatedly call inflateSync, providing more input each time, until success or end of the input data. */


ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm)); /* This function is equivalent to inflateEnd followed by inflateInit, but does not free and reallocate all the internal decompression state. The stream will keep attributes that may have been set by inflateInit2.

inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source stream state was inconsistent (such as zalloc or state being NULL). */


/* utility functions */

/* The following utility functions are implemented on top of the basic stream-oriented functions. To simplify the interface, some default options are assumed (compression level and memory usage, standard memory allocation functions). The source code of these utility functions can easily be modified if you need special options. */

ZEXTERN int ZEXPORT compress OF((Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen)); /* Compresses the source buffer into the destination buffer. sourceLen is the byte length of the source buffer. Upon entry, destLen is the total size of the destination buffer, which must be at least 0.1% larger than sourceLen plus 12 bytes. Upon exit, destLen is the actual size of the compressed buffer. This function can be used to compress a whole file at once if the input file is mmap'ed. compress returns Z_OK if success, Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR if there was not enough room in the output buffer. */

ZEXTERN int ZEXPORT compress2 OF((Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen, int level)); /* Compresses the source buffer into the destination buffer. The level parameter has the same meaning as in deflateInit. sourceLen is the byte length of the source buffer. Upon entry, destLen is the total size of the destination buffer, which must be at least 0.1% larger than sourceLen plus 12 bytes. Upon exit, destLen is the actual size of the compressed buffer.

compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR if there was not enough room in the output buffer, Z_STREAM_ERROR if the level parameter is invalid. */


ZEXTERN int ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen)); /* Decompresses the source buffer into the destination buffer. sourceLen is the byte length of the source buffer. Upon entry, destLen is the total size of the destination buffer, which must be large enough to hold the entire uncompressed data. (The size of the uncompressed data must have been saved previously by the compressor and transmitted to the decompressor by some mechanism outside the scope of this compression library.) Upon exit, destLen is the actual size of the compressed buffer. This function can be used to decompress a whole file at once if the input file is mmap'ed.

uncompress returns Z_OK if success, Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR if there was not enough room in the output buffer, or Z_DATA_ERROR if the input data was corrupted. */


typedef voidp gzFile;

ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode)); /* Opens a gzip (.gz) file for reading or writing. The mode parameter is as in fopen ("rb" or "wb") but can also include a compression level ("wb9") or a strategy: 'f' for filtered data as in "wb6f", 'h' for Huffman only compression as in "wb1h". (See the description of deflateInit2 for more information about the strategy parameter.)

gzopen can be used to read a file which is not in gzip format; in this case gzread will directly read from the file without decompression.

gzopen returns NULL if the file could not be opened or if there was insufficient memory to allocate the (de)compression state; errno can be checked to distinguish the two cases (if errno is zero, the zlib error is Z_MEM_ERROR). */


ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode)); /* gzdopen() associates a gzFile with the file descriptor fd. File descriptors are obtained from calls like open, dup, creat, pipe or fileno (in the file has been previously opened with fopen). The mode parameter is as in gzopen. The next call of gzclose on the returned gzFile will also close the file descriptor fd, just like fclose(fdopen(fd), mode) closes the file descriptor fd. If you want to keep fd open, use gzdopen(dup(fd), mode). gzdopen returns NULL if there was insufficient memory to allocate the (de)compression state. */

ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy)); /* Dynamically update the compression level or strategy. See the description of deflateInit2 for the meaning of these parameters. gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not opened for writing. */

ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len)); /* Reads the given number of uncompressed bytes from the compressed file. If the input file was not in gzip format, gzread copies the given number of bytes into the buffer. gzread returns the number of uncompressed bytes actually read (0 for end of file, -1 for error). */

ZEXTERN int ZEXPORT gzwrite OF((gzFile file, const voidp buf, unsigned len)); /* Writes the given number of uncompressed bytes into the compressed file. gzwrite returns the number of uncompressed bytes actually written (0 in case of error). */

ZEXTERN int ZEXPORTVA gzprintf OF((gzFile file, const char *format, ...)); /* Converts, formats, and writes the args to the compressed file under control of the format string, as in fprintf. gzprintf returns the number of uncompressed bytes actually written (0 in case of error). */

ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s)); /* Writes the given null-terminated string to the compressed file, excluding the terminating null character. gzputs returns the number of characters written, or -1 in case of error. */

ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len)); /* Reads bytes from the compressed file until len-1 characters are read, or a newline character is read and transferred to buf, or an end-of-file condition is encountered. The string is then terminated with a null character. gzgets returns buf, or Z_NULL in case of error. */

ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c)); /* Writes c, converted to an unsigned char, into the compressed file. gzputc returns the value that was written, or -1 in case of error. */

ZEXTERN int ZEXPORT gzgetc OF((gzFile file)); /* Reads one byte from the compressed file. gzgetc returns this byte or -1 in case of end of file or error. */

ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush)); /* Flushes all pending output into the compressed file. The parameter flush is as in the deflate() function. The return value is the zlib error number (see function gzerror below). gzflush returns Z_OK if the flush parameter is Z_FINISH and all output could be flushed. gzflush should be called only when strictly necessary because it can degrade compression. */

ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file, z_off_t offset, int whence)); /* Sets the starting position for the next gzread or gzwrite on the given compressed file. The offset represents a number of bytes in the uncompressed data stream. The whence parameter is defined as in lseek(2); the value SEEK_END is not supported. If the file is opened for reading, this function is emulated but can be extremely slow. If the file is opened for writing, only forward seeks are supported; gzseek then compresses a sequence of zeroes up to the new starting position.

gzseek returns the resulting offset location as measured in bytes from the beginning of the uncompressed stream, or -1 in case of error, in particular if the file is opened for writing and the new starting position would be before the current position. */


ZEXTERN int ZEXPORT gzrewind OF((gzFile file)); /* Rewinds the given file. This function is supported only for reading.

gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET) */


ZEXTERN z_off_t ZEXPORT gztell OF((gzFile file)); /* Returns the starting position for the next gzread or gzwrite on the given compressed file. This position represents a number of bytes in the uncompressed data stream.

gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR) */


ZEXTERN int ZEXPORT gzeof OF((gzFile file)); /* Returns 1 when EOF has previously been detected reading the given input stream, otherwise zero. */

ZEXTERN int ZEXPORT gzclose OF((gzFile file)); /* Flushes all pending output if necessary, closes the compressed file and deallocates all the (de)compression state. The return value is the zlib error number (see function gzerror below). */

ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum)); /* Returns the error message for the last error which occurred on the given compressed file. errnum is set to zlib error number. If an error occurred in the file system and not in the compression library, errnum is set to Z_ERRNO and the application may consult errno to get the exact error code. */

/* checksum functions */

/* These functions are not related to compression but are exported anyway because they might be useful in applications using the compression library. */

ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));

/* Update a running Adler-32 checksum with the bytes buf[0..len-1] and return the updated checksum. If buf is NULL, this function returns the required initial value for the checksum. An Adler-32 checksum is almost as reliable as a CRC32 but can be computed much faster. Usage example:

uLong adler = adler32(0L, Z_NULL, 0);

while (read_buffer(buffer, length) != EOF) { adler = adler32(adler, buffer, length); } if (adler != original_adler) error(); */


ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len)); /* Update a running crc with the bytes buf[0..len-1] and return the updated crc. If buf is NULL, this function returns the required initial value for the crc. Pre- and post-conditioning (one's complement) is performed within this function so it shouldn't be done by the application. Usage example:

uLong crc = crc32(0L, Z_NULL, 0);

while (read_buffer(buffer, length) != EOF) { crc = crc32(crc, buffer, length); } if (crc != original_crc) error(); */


/* various hacks, don't look :) */

/* deflateInit and inflateInit are macros to allow checking the zlib version * and the compiler's view of z_stream: */ ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level, const char *version, int stream_size)); ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm, const char *version, int stream_size)); ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int level, int method, int windowBits, int memLevel, int strategy, const char *version, int stream_size)); ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int windowBits, const char *version, int stream_size)); #define deflateInit(strm, level) \ deflateInit_((strm), (level), ZLIB_VERSION, sizeof(z_stream)) #define inflateInit(strm) \ inflateInit_((strm), ZLIB_VERSION, sizeof(z_stream)) #define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \ deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\ (strategy), ZLIB_VERSION, sizeof(z_stream)) #define inflateInit2(strm, windowBits) \ inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))

#if !defined(_Z_UTIL_H) && !defined(NO_DUMMY_DECL) struct internal_state {int dummy;}; /* hack for buggy compilers */ #endif

ZEXTERN const char * ZEXPORT zError OF((int err)); ZEXTERN int ZEXPORT inflateSyncPoint OF((z_streamp z)); ZEXTERN const uLongf * ZEXPORT get_crc_table OF((void));

#ifdef __cplusplus } #endif

#endif /* _ZLIB_H */

The zip file viewer built into the Developer Toolbox made use of the zlib library, as well as the zlibdll source additions.

 

Copyright 1999-2008 (C) FLIPCODE.COM and/or the original content author(s). All rights reserved.
Please read our Terms, Conditions, and Privacy information.