/* Hatari - unzip.c Support for *.zip files, uses zlib. This file is originally from the minizip code by Gilles Vollant. */ /* unzip.c -- IO on .zip files using zlib Version 0.15 beta, Mar 19th, 1998, Read unzip.h for more info */ const char Unzip_rcsid[] = "Hatari $Id: unzip.c,v 1.10 2007/01/16 18:42:59 thothy Exp $"; #include #include #include #include #include #include #include "unzip.h" #ifdef NO_ERRNO_H extern int errno; #else # include #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 const char unz_copyright[] = " unzip 0.15 Copyright 1998 Gilles Vollant "; /* 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_getByte(FILE *fin, int *pi) { unsigned char c; int err = fread(&c, 1, 1, fin); if (err==1) { *pi = (int)c; return UNZ_OK; } else { if (ferror(fin)) return UNZ_ERRNO; else return UNZ_EOF; } } /* ===========================================================================*/ /** * Reads a long in LSB order from the given gz_stream. Sets */ local int unzlocal_getShort (FILE* fin, uLong *pX) { uLong x ; int i; int err; err = unzlocal_getByte(fin,&i); x = (uLong)i; if (err==UNZ_OK) err = unzlocal_getByte(fin,&i); x += ((uLong)i)<<8; if (err==UNZ_OK) *pX = x; else *pX = 0; return err; } local int unzlocal_getLong (FILE* fin, uLong *pX) { uLong x ; int i; int err; err = unzlocal_getByte(fin,&i); x = (uLong)i; if (err==UNZ_OK) err = unzlocal_getByte(fin,&i); x += ((uLong)i)<<8; if (err==UNZ_OK) err = unzlocal_getByte(fin,&i); x += ((uLong)i)<<16; if (err==UNZ_OK) err = unzlocal_getByte(fin,&i); x += ((uLong)i)<<24; if (err==UNZ_OK) *pX = x; else *pX = 0; return err; } #ifdef CASESENSITIVITYDEFAULT_NO #define CASESENSITIVITYDEFAULTVALUE 2 #else #define CASESENSITIVITYDEFAULTVALUE 1 #endif /** * 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) * */ int ZEXPORT unzStringFileNameCompare (const char* fileName1, const char* fileName2, int iCaseSensitivity) { if (iCaseSensitivity==0) iCaseSensitivity=CASESENSITIVITYDEFAULTVALUE; if (iCaseSensitivity==1) return strcmp(fileName1, fileName2); return strcasecmp(fileName1, fileName2); } #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==NULL) return 0; uBackRead = 4; while (uBackReaduMaxBack) 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. */ 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; if (unz_copyright[0]!=' ') return NULL; fin=fopen(path,"rb"); if (fin==NULL) return NULL; central_pos = unzlocal_SearchCentralDir(fin); if (central_pos==0) 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_pospfile_in_zip_read!=NULL) 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. */ int ZEXPORT unzGetGlobalInfo (unzFile file, unz_global_info *pglobal_info) { unz_s* s; if (file==NULL) return UNZ_PARAMERROR; s=(unz_s*)file; *pglobal_info=s->gi; return UNZ_OK; } /** * Translate date/time from Dos format to tm_unz (readable more easilty) */ local void unzlocal_DosDateToTmuDate (uLong ulDosDate, tm_unz* ptm) { uLong uDate; uDate = (uLong)(ulDosDate>>16); ptm->tm_mday = (uInt)(uDate&0x1f) ; ptm->tm_mon = (uInt)((((uDate)&0x1E0)/0x20)-1) ; ptm->tm_year = (uInt)(((uDate&0x0FE00)/0x0200)+1980) ; ptm->tm_hour = (uInt) ((ulDosDate &0xF800)/0x800); ptm->tm_min = (uInt) ((ulDosDate&0x7E0)/0x20) ; ptm->tm_sec = (uInt) (2*(ulDosDate&0x1f)) ; } /** * Get Info about the current file in the zipfile, with internal only info */ 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==NULL) 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; } if (unzlocal_getShort(s->file,&file_info.version) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(s->file,&file_info.version_needed) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(s->file,&file_info.flag) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(s->file,&file_info.compression_method) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getLong(s->file,&file_info.dosDate) != UNZ_OK) err=UNZ_ERRNO; unzlocal_DosDateToTmuDate(file_info.dosDate,&file_info.tmu_date); if (unzlocal_getLong(s->file,&file_info.crc) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getLong(s->file,&file_info.compressed_size) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getLong(s->file,&file_info.uncompressed_size) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(s->file,&file_info.size_filename) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(s->file,&file_info.size_file_extra) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(s->file,&file_info.size_file_comment) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(s->file,&file_info.disk_num_start) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(s->file,&file_info.internal_fa) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getLong(s->file,&file_info.external_fa) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getLong(s->file,&file_info_internal.offset_curfile) != UNZ_OK) err=UNZ_ERRNO; lSeek+=file_info.size_filename; if ((err==UNZ_OK) && (szFileName!=NULL)) { uLong uSizeRead ; if (file_info.size_filename0) && (fileNameBufferSize>0)) if (fread(szFileName,(uInt)uSizeRead,1,s->file)!=1) err=UNZ_ERRNO; lSeek -= uSizeRead; } if ((err==UNZ_OK) && (extraField!=NULL)) { uLong uSizeRead ; if (file_info.size_file_extrafile,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!=NULL)) { uLong uSizeRead ; if (file_info.size_file_commentfile,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!=NULL)) *pfile_info=file_info; if ((err==UNZ_OK) && (pfile_info_internal!=NULL)) *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. */ 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 */ int ZEXPORT unzGoToFirstFile (unzFile file) { int err=UNZ_OK; unz_s* s; if (file==NULL) 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. */ int ZEXPORT unzGoToNextFile (unzFile file) { unz_s* s; int err; if (file==NULL) 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; } /** * Try locate the file szFileName in the zipfile. * For the iCaseSensitivity signification, see unzipStringFileNameCompare * * 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 */ int ZEXPORT unzLocateFile (unzFile file, const char *szFileName, int iCaseSensitivity) { unz_s* s; int err; uLong num_fileSaved; uLong pos_in_central_dirSaved; if (file==NULL) return UNZ_PARAMERROR; if (strlen(szFileName) >= UNZ_MAXFILENAMEINZIP) return UNZ_PARAMERROR; s=(unz_s*)file; if (!s->current_file_ok) return UNZ_END_OF_LIST_OF_FILE; num_fileSaved = s->num_file; pos_in_central_dirSaved = s->pos_in_central_dir; err = unzGoToFirstFile(file); while (err == UNZ_OK) { char szCurrentFileName[UNZ_MAXFILENAMEINZIP+1]; unzGetCurrentFileInfo(file,NULL, szCurrentFileName,sizeof(szCurrentFileName)-1, NULL,0,NULL,0); if (unzStringFileNameCompare(szCurrentFileName, szFileName,iCaseSensitivity)==0) return UNZ_OK; err = unzGoToNextFile(file); } s->num_file = num_fileSaved ; s->pos_in_central_dir = pos_in_central_dirSaved ; return err; } /** * 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; /* else if ((err==UNZ_OK) && (uData!=s->cur_file_info.wVersion)) err=UNZ_BADZIPFILE; */ 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; if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* date/time */ err=UNZ_ERRNO; if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* crc */ err=UNZ_ERRNO; else if ((err==UNZ_OK) && (uData!=s->cur_file_info.crc) && ((uFlags & 8)==0)) err=UNZ_BADZIPFILE; if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* size compr */ err=UNZ_ERRNO; else if ((err==UNZ_OK) && (uData!=s->cur_file_info.compressed_size) && ((uFlags & 8)==0)) err=UNZ_BADZIPFILE; if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* size uncompr */ 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. */ 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==NULL) return UNZ_PARAMERROR; s=(unz_s*)file; if (!s->current_file_ok) return UNZ_PARAMERROR; if (s->pfile_in_zip_read != NULL) 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==NULL) 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==NULL) { 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) */ 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==NULL) return UNZ_PARAMERROR; s=(unz_s*)file; pfile_in_zip_read_info=s->pfile_in_zip_read; if (pfile_in_zip_read_info==NULL) return UNZ_PARAMERROR; if ((pfile_in_zip_read_info->read_buffer == NULL)) return UNZ_END_OF_LIST_OF_FILE; if (len==0) 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_compressedrest_read_compressed; if (uReadThis == 0) 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;istream.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; /* if ((pfile_in_zip_read_info->rest_read_uncompressed == pfile_in_zip_read_info->stream.avail_out) && (pfile_in_zip_read_info->rest_read_compressed == 0)) flush = Z_FINISH; */ 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 */ z_off_t ZEXPORT unztell (unzFile file) { unz_s* s; file_in_zip_read_info_s* pfile_in_zip_read_info; if (file==NULL) return UNZ_PARAMERROR; s=(unz_s*)file; pfile_in_zip_read_info=s->pfile_in_zip_read; if (pfile_in_zip_read_info==NULL) 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 */ int ZEXPORT unzeof (unzFile file) { unz_s* s; file_in_zip_read_info_s* pfile_in_zip_read_info; if (file==NULL) return UNZ_PARAMERROR; s=(unz_s*)file; pfile_in_zip_read_info=s->pfile_in_zip_read; if (pfile_in_zip_read_info==NULL) 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 */ 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==NULL) return UNZ_PARAMERROR; s=(unz_s*)file; pfile_in_zip_read_info=s->pfile_in_zip_read; if (pfile_in_zip_read_info==NULL) return UNZ_PARAMERROR; size_to_read = (pfile_in_zip_read_info->size_local_extrafield - pfile_in_zip_read_info->pos_local_extrafield); if (buf==NULL) return (int)size_to_read; if (len>size_to_read) read_now = (uInt)size_to_read; else read_now = (uInt)len ; if (read_now==0) 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 */ 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==NULL) return UNZ_PARAMERROR; s=(unz_s*)file; pfile_in_zip_read_info=s->pfile_in_zip_read; if (pfile_in_zip_read_info==NULL) return UNZ_PARAMERROR; if (pfile_in_zip_read_info->rest_read_uncompressed == 0) { 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 */ int ZEXPORT unzGetGlobalComment (unzFile file, char *szComment, uLong uSizeBuf) { unz_s* s; uLong uReadThis ; if (file==NULL) 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; }