/* $Id$ */ /* * unzip.c -- IO on .zip files using zlib Version 0.15 beta, Mar 19th, 1998, * * Read unzip.h for more info */ #include #include #include #include #include "unzip.h" #ifdef STDC #include #include #include #endif #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 successfully opened for * reading. */ local int unzlocal_getByte(fin, pi) 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(fin, pX) 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(fin, pX) 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; } /* * My own strcmpi / strcasecmp */ local int strcmpcasenosensitive_internal(fileName1, fileName2) const char *fileName1; const char *fileName2; { for (;;) { char c1 = *(fileName1++); char c2 = *(fileName2++); if ((c1 >= 'a') && (c1 <= 'z')) c1 -= 0x20; if ((c2 >= 'a') && (c2 <= 'z')) c2 -= 0x20; if (c1 == '\0') return ((c2 == '\0') ? 0 : -1); if (c2 == '\0') return 1; if (c1 < c2) return -1; if (c1 > c2) return 1; } } #ifdef CASESENSITIVITYDEFAULT_NO #define CASESENSITIVITYDEFAULTVALUE 2 #else #define CASESENSITIVITYDEFAULTVALUE 1 #endif #ifndef STRCMPCASENOSENTIVEFUNCTION #define STRCMPCASENOSENTIVEFUNCTION strcmpcasenosensitive_internal #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) * */ extern int ZEXPORT unzStringFileNameCompare(fileName1, fileName2, iCaseSensitivity) const char *fileName1; const char *fileName2; int iCaseSensitivity; { if (iCaseSensitivity == 0) iCaseSensitivity = CASESENSITIVITYDEFAULTVALUE; if (iCaseSensitivity == 1) return strcmp(fileName1, fileName2); return STRCMPCASENOSENTIVEFUNCTION(fileName1, fileName2); } #define BUFREADCOMMENT (0x400) /* * Locate the Central directory of a zipfile (at the end, just before the * global comment) */ local uLong unzlocal_SearchCentralDir(fin) 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 (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(path) 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_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(file) unzFile file; { unz_s *s; if (file == NULL) return UNZ_PARAMERROR; s = (unz_s *) file; if (s->pfile_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. */ extern int ZEXPORT unzGetGlobalInfo(file, pglobal_info) 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(ulDosDate, ptm) 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 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(file, pfile_info, pfile_info_internal, szFileName, fileNameBufferSize, extraField, extraFieldBufferSize, szComment, commentBufferSize) 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_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 != NULL)) { 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 != NULL)) { 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 != 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. */ extern int ZEXPORT unzGetCurrentFileInfo(file, pfile_info, szFileName, fileNameBufferSize, extraField, extraFieldBufferSize, szComment, commentBufferSize) 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(file) 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. */ extern int ZEXPORT unzGoToNextFile(file) 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 */ extern int ZEXPORT unzLocateFile(file, szFileName, iCaseSensitivity) 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(s, piSizeVar, poffset_local_extrafield, psize_local_extrafield) 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. */ extern int ZEXPORT unzOpenCurrentFile(file) 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) */ extern int ZEXPORT unzReadCurrentFile(file, buf, len) 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_compressed < uReadThis) uReadThis = (uInt) pfile_in_zip_read_info->rest_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; 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; /* 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 */ extern z_off_t ZEXPORT unztell(file) 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 */ extern int ZEXPORT unzeof(file) 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 */ extern int ZEXPORT unzGetLocalExtrafield(file, buf, len) 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 */ extern int ZEXPORT unzCloseCurrentFile(file) 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 */ extern int ZEXPORT unzGetGlobalComment(file, szComment, uSizeBuf) unzFile file; char *szComment; uLong uSizeBuf; { //int err = UNZ_OK; /* unused */ 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; }