/* This file is part of libextractor. (C) 2004 Vidyut Samanta and Christian Grothoff libextractor is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. libextractor is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with libextractor; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "platform.h" #include #include "extractor.h" #include "zlib.h" #define CASESENSITIVITY (0) #define MAXFILENAME (256) /* *********************** IOAPI ***************** */ #define ZLIB_FILEFUNC_SEEK_CUR (1) #define ZLIB_FILEFUNC_SEEK_END (2) #define ZLIB_FILEFUNC_SEEK_SET (0) #define ZLIB_FILEFUNC_MODE_READ (1) #define ZLIB_FILEFUNC_MODE_WRITE (2) #define ZLIB_FILEFUNC_MODE_READWRITEFILTER (3) #define ZLIB_FILEFUNC_MODE_EXISTING (4) #define ZLIB_FILEFUNC_MODE_CREATE (8) typedef voidpf ( *open_file_func) (voidpf opaque, const char* filename, int mode); typedef uLong ( *read_file_func) (voidpf opaque, voidpf stream, void* buf, uLong size); typedef uLong ( *write_file_func) (voidpf opaque, voidpf stream, const void* buf, uLong size); typedef long ( *tell_file_func) (voidpf opaque, voidpf stream); typedef long ( *seek_file_func) (voidpf opaque, voidpf stream, uLong offset, int origin); typedef int ( *close_file_func) (voidpf opaque, voidpf stream); typedef int ( *testerror_file_func) (voidpf opaque, voidpf stream); typedef struct zlib_filefunc_def_s { open_file_func zopen_file; read_file_func zread_file; write_file_func zwrite_file; tell_file_func ztell_file; seek_file_func zseek_file; close_file_func zclose_file; testerror_file_func zerror_file; voidpf opaque; } zlib_filefunc_def; #define ZREAD(filefunc,filestream,buf,size) ((*((filefunc).zread_file))((filefunc).opaque,filestream,buf,size)) #define ZWRITE(filefunc,filestream,buf,size) ((*((filefunc).zwrite_file))((filefunc).opaque,filestream,buf,size)) #define ZTELL(filefunc,filestream) ((*((filefunc).ztell_file))((filefunc).opaque,filestream)) #define ZSEEK(filefunc,filestream,pos,mode) ((*((filefunc).zseek_file))((filefunc).opaque,filestream,pos,mode)) #define ZCLOSE(filefunc,filestream) ((*((filefunc).zclose_file))((filefunc).opaque,filestream)) #define ZERROR(filefunc,filestream) ((*((filefunc).zerror_file))((filefunc).opaque,filestream)) /* ******************* former crypt.h ********************* */ #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 */ typedef struct unz_file_info_s { uLong version; /* version made by 2 bytes */ uLong version_needed; /* version needed to extract 2 bytes */ uLong flag; /* general purpose bit flag 2 bytes */ uLong 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 */ uLong size_filename; /* filename length 2 bytes */ uLong size_file_extra; /* extra field length 2 bytes */ uLong size_file_comment; /* file comment length 2 bytes */ uLong disk_num_start; /* disk number start 2 bytes */ uLong internal_fa; /* internal file attributes 2 bytes */ uLong external_fa; /* external file attributes 4 bytes */ tm_unz tmu_date; } unz_file_info; /* 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 */ #ifndef CASESENSITIVITYDEFAULT_NO # if !defined(unix) && !defined(CASESENSITIVITYDEFAULT_YES) # define CASESENSITIVITYDEFAULT_NO # endif #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) const char unz_copyright[] = " unzip 1.00 Copyright 1998-2003 Gilles Vollant - http://www.winimage.com/zLibDll"; /* 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*/ zlib_filefunc_def z_filefunc; voidpf filestream; /* io structore of the zipfile */ uLong compression_method; /* compression method (0==store) */ uLong byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/ int raw; } file_in_zip_read_info_s; /* unz_s contain internal information about the zipfile */ typedef struct { zlib_filefunc_def z_filefunc; voidpf filestream; /* 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 */ int encrypted; } 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. */ static int unzlocal_getByte OF(( const zlib_filefunc_def* pzlib_filefunc_def, voidpf filestream, int *pi)); static int unzlocal_getByte(pzlib_filefunc_def,filestream,pi) const zlib_filefunc_def* pzlib_filefunc_def; voidpf filestream; int *pi; { unsigned char c; int err = (int)ZREAD(*pzlib_filefunc_def,filestream,&c,1); if (err==1) { *pi = (int)c; return UNZ_OK; } else { if (ZERROR(*pzlib_filefunc_def,filestream)) return UNZ_ERRNO; else return UNZ_EOF; } } /* =========================================================================== Reads a long in LSB order from the given gz_stream. Sets */ static int unzlocal_getShort OF(( const zlib_filefunc_def* pzlib_filefunc_def, voidpf filestream, uLong *pX)); static int unzlocal_getShort (pzlib_filefunc_def,filestream,pX) const zlib_filefunc_def* pzlib_filefunc_def; voidpf filestream; uLong *pX; { uLong x ; int i; int err; err = unzlocal_getByte(pzlib_filefunc_def,filestream,&i); x = (uLong)i; if (err==UNZ_OK) err = unzlocal_getByte(pzlib_filefunc_def,filestream,&i); x += ((uLong)i)<<8; if (err==UNZ_OK) *pX = x; else *pX = 0; return err; } static int unzlocal_getLong OF(( const zlib_filefunc_def* pzlib_filefunc_def, voidpf filestream, uLong *pX)); static int unzlocal_getLong (pzlib_filefunc_def,filestream,pX) const zlib_filefunc_def* pzlib_filefunc_def; voidpf filestream; uLong *pX; { uLong x ; int i; int err; err = unzlocal_getByte(pzlib_filefunc_def,filestream,&i); x = (uLong)i; if (err==UNZ_OK) err = unzlocal_getByte(pzlib_filefunc_def,filestream,&i); x += ((uLong)i)<<8; if (err==UNZ_OK) err = unzlocal_getByte(pzlib_filefunc_def,filestream,&i); x += ((uLong)i)<<16; if (err==UNZ_OK) err = unzlocal_getByte(pzlib_filefunc_def,filestream,&i); x += ((uLong)i)<<24; if (err==UNZ_OK) *pX = x; else *pX = 0; return err; } /* My own strcmpi / strcasecmp */ static 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 (c1c2) 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) */ static 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); } #ifndef BUFREADCOMMENT #define BUFREADCOMMENT (0x400) #endif /* Locate the Central directory of a zipfile (at the end, just before the global comment) */ static uLong unzlocal_SearchCentralDir OF(( const zlib_filefunc_def* pzlib_filefunc_def, voidpf filestream)); static uLong unzlocal_SearchCentralDir(pzlib_filefunc_def,filestream) const zlib_filefunc_def* pzlib_filefunc_def; voidpf filestream; { unsigned char* buf; uLong uSizeFile; uLong uBackRead; uLong uMaxBack=0xffff; /* maximum size of global comment */ uLong uPosFound=0; if (ZSEEK(*pzlib_filefunc_def,filestream,0,ZLIB_FILEFUNC_SEEK_END) != 0) return 0; uSizeFile = ZTELL(*pzlib_filefunc_def,filestream); 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 (ZSEEK(*pzlib_filefunc_def,filestream,uReadPos,ZLIB_FILEFUNC_SEEK_SET)!=0) break; if (ZREAD(*pzlib_filefunc_def,filestream,buf,uReadSize)!=uReadSize) 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; } /* Translate date/time from Dos format to tm_unz (readable more easilty) */ static 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)) ; } static 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 (ZSEEK(s->z_filefunc, s->filestream, s->pos_in_central_dir+s->byte_before_the_zipfile, ZLIB_FILEFUNC_SEEK_SET)!=0) err=UNZ_ERRNO; /* we check the magic */ if (err==UNZ_OK) { if (unzlocal_getLong(&s->z_filefunc, s->filestream,&uMagic) != UNZ_OK) err=UNZ_ERRNO; else if (uMagic!=0x02014b50) err=UNZ_BADZIPFILE; } if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.version) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.version_needed) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.flag) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.compression_method) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getLong(&s->z_filefunc, s->filestream,&file_info.dosDate) != UNZ_OK) err=UNZ_ERRNO; unzlocal_DosDateToTmuDate(file_info.dosDate,&file_info.tmu_date); if (unzlocal_getLong(&s->z_filefunc, s->filestream,&file_info.crc) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getLong(&s->z_filefunc, s->filestream,&file_info.compressed_size) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getLong(&s->z_filefunc, s->filestream,&file_info.uncompressed_size) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.size_filename) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.size_file_extra) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.size_file_comment) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.disk_num_start) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(&s->z_filefunc, s->filestream,&file_info.internal_fa) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getLong(&s->z_filefunc, s->filestream,&file_info.external_fa) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getLong(&s->z_filefunc, s->filestream,&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 (ZREAD(s->z_filefunc, s->filestream,szFileName,uSizeRead)!=uSizeRead) err=UNZ_ERRNO; lSeek -= uSizeRead; } if ((err==UNZ_OK) && (extraField!=NULL)) { uLong uSizeRead ; if (file_info.size_file_extraz_filefunc, s->filestream,lSeek,ZLIB_FILEFUNC_SEEK_CUR)==0) lSeek=0; else err=UNZ_ERRNO; } if ((file_info.size_file_extra>0) && (extraFieldBufferSize>0)) if (ZREAD(s->z_filefunc, s->filestream,extraField,uSizeRead)!=uSizeRead) 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_commentz_filefunc, s->filestream,lSeek,ZLIB_FILEFUNC_SEEK_CUR)==0) lSeek=0; else err=UNZ_ERRNO; } if ((file_info.size_file_comment>0) && (commentBufferSize>0)) if (ZREAD(s->z_filefunc, s->filestream,szComment,uSizeRead)!=uSizeRead) 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; } /* Set the current file of the zipfile to the first file. return UNZ_OK if there is no problem */ static 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; } /* Open a Zip file. path contain the full pathname (by example, on a Windows NT computer "c:\\test\\zlib114.zip" or on an Unix computer "zlib/zlib114.zip". If the zipfile cannot be opened (file doesn'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. */ static unzFile ZEXPORT unzOpen2 (path, pzlib_filefunc_def) const char *path; zlib_filefunc_def* pzlib_filefunc_def; { unz_s us; unz_s *s; uLong central_pos,uL; 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; us.z_filefunc = *pzlib_filefunc_def; us.filestream= (*(us.z_filefunc.zopen_file))(us.z_filefunc.opaque, path, ZLIB_FILEFUNC_MODE_READ | ZLIB_FILEFUNC_MODE_EXISTING); if (us.filestream==NULL) return NULL; central_pos = unzlocal_SearchCentralDir(&us.z_filefunc,us.filestream); if (central_pos==0) err=UNZ_ERRNO; if (ZSEEK(us.z_filefunc, us.filestream, central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0) err=UNZ_ERRNO; /* the signature, already checked */ if (unzlocal_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK) err=UNZ_ERRNO; /* number of this disk */ if (unzlocal_getShort(&us.z_filefunc, us.filestream,&number_disk)!=UNZ_OK) err=UNZ_ERRNO; /* number of the disk with the start of the central directory */ if (unzlocal_getShort(&us.z_filefunc, us.filestream,&number_disk_with_CD)!=UNZ_OK) err=UNZ_ERRNO; /* total number of entries in the central dir on this disk */ if (unzlocal_getShort(&us.z_filefunc, us.filestream,&us.gi.number_entry)!=UNZ_OK) err=UNZ_ERRNO; /* total number of entries in the central dir */ if (unzlocal_getShort(&us.z_filefunc, us.filestream,&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(&us.z_filefunc, us.filestream,&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(&us.z_filefunc, us.filestream,&us.offset_central_dir)!=UNZ_OK) err=UNZ_ERRNO; /* zipfile comment length */ if (unzlocal_getShort(&us.z_filefunc, us.filestream,&us.gi.size_comment)!=UNZ_OK) err=UNZ_ERRNO; if ((central_pospfile_in_zip_read; if (pfile_in_zip_read_info==NULL) return UNZ_PARAMERROR; if ((pfile_in_zip_read_info->rest_read_uncompressed == 0) && (!pfile_in_zip_read_info->raw)) { 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; } /* 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. */ static 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); ZCLOSE(s->z_filefunc, s->filestream); 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. */ static 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 next file. return UNZ_OK if there is no problem return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest. */ static 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 */ static int ZEXPORT unzLocateFile (file, szFileName, iCaseSensitivity) unzFile file; const char *szFileName; int iCaseSensitivity; { unz_s* s; int err; /* We remember the 'current' position in the file so that we can jump * back there if we fail. */ unz_file_info cur_file_infoSaved; unz_file_info_internal cur_file_info_internalSaved; 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; /* Save the current state */ num_fileSaved = s->num_file; pos_in_central_dirSaved = s->pos_in_central_dir; cur_file_infoSaved = s->cur_file_info; cur_file_info_internalSaved = s->cur_file_info_internal; err = unzGoToFirstFile(file); while (err == UNZ_OK) { char szCurrentFileName[UNZ_MAXFILENAMEINZIP+1]; err = unzGetCurrentFileInfo(file,NULL, szCurrentFileName,sizeof(szCurrentFileName)-1, NULL,0,NULL,0); if (err == UNZ_OK) { if (unzStringFileNameCompare(szCurrentFileName, szFileName,iCaseSensitivity)==0) return UNZ_OK; err = unzGoToNextFile(file); } } /* We failed, so restore the state of the 'current file' to where we * were. */ s->num_file = num_fileSaved ; s->pos_in_central_dir = pos_in_central_dirSaved ; s->cur_file_info = cur_file_infoSaved; s->cur_file_info_internal = cur_file_info_internalSaved; return err; } /* 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) */ static 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_compressedrest_read_compressed; if (uReadThis == 0) return UNZ_EOF; if (ZSEEK(pfile_in_zip_read_info->z_filefunc, pfile_in_zip_read_info->filestream, pfile_in_zip_read_info->pos_in_zipfile + pfile_in_zip_read_info->byte_before_the_zipfile, ZLIB_FILEFUNC_SEEK_SET)!=0) return UNZ_ERRNO; if (ZREAD(pfile_in_zip_read_info->z_filefunc, pfile_in_zip_read_info->filestream, pfile_in_zip_read_info->read_buffer, uReadThis)!=uReadThis) 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) || (pfile_in_zip_read_info->raw)) { uInt uDoCopy,i ; if ((pfile_in_zip_read_info->stream.avail_in == 0) && (pfile_in_zip_read_info->rest_read_compressed == 0)) return (iRead==0) ? UNZ_EOF : iRead; 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; } /* 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) */ static 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 (ZSEEK(s->z_filefunc, s->filestream,s->cur_file_info_internal.offset_curfile + s->byte_before_the_zipfile,ZLIB_FILEFUNC_SEEK_SET)!=0) return UNZ_ERRNO; if (err==UNZ_OK) { if (unzlocal_getLong(&s->z_filefunc, s->filestream,&uMagic) != UNZ_OK) err=UNZ_ERRNO; else if (uMagic!=0x04034b50) err=UNZ_BADZIPFILE; } if (unzlocal_getShort(&s->z_filefunc, s->filestream,&uData) != UNZ_OK) err=UNZ_ERRNO; /* else if ((err==UNZ_OK) && (uData!=s->cur_file_info.wVersion)) err=UNZ_BADZIPFILE; */ if (unzlocal_getShort(&s->z_filefunc, s->filestream,&uFlags) != UNZ_OK) err=UNZ_ERRNO; if (unzlocal_getShort(&s->z_filefunc, s->filestream,&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->z_filefunc, s->filestream,&uData) != UNZ_OK) /* date/time */ err=UNZ_ERRNO; if (unzlocal_getLong(&s->z_filefunc, s->filestream,&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->z_filefunc, s->filestream,&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->z_filefunc, s->filestream,&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->z_filefunc, s->filestream,&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->z_filefunc, s->filestream,&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. */ static int ZEXPORT unzOpenCurrentFile3 (file, method, level, raw) unzFile file; int* method; int* level; int raw; { int err=UNZ_OK; 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; pfile_in_zip_read_info->raw=raw; 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 (method!=NULL) *method = (int)s->cur_file_info.compression_method; if (level!=NULL) { *level = 6; switch (s->cur_file_info.flag & 0x06) { case 6 : *level = 1; break; case 4 : *level = 2; break; case 2 : *level = 9; break; } } if ((s->cur_file_info.compression_method!=0) && (s->cur_file_info.compression_method!=Z_DEFLATED)) err=UNZ_BADZIPFILE; 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->filestream=s->filestream; pfile_in_zip_read_info->z_filefunc=s->z_filefunc; pfile_in_zip_read_info->byte_before_the_zipfile=s->byte_before_the_zipfile; pfile_in_zip_read_info->stream.total_out = 0; if ((s->cur_file_info.compression_method==Z_DEFLATED) && (!raw)) { 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; pfile_in_zip_read_info->stream.next_in = (voidpf)0; pfile_in_zip_read_info->stream.avail_in = 0; err=inflateInit2(&pfile_in_zip_read_info->stream, -MAX_WBITS); if (err == Z_OK) pfile_in_zip_read_info->stream_initialised=1; else return err; /* 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; } /* *************************** main extractor code *********************** */ /** * Name of the file with the meta-data in OO documents. */ #define METAFILE "meta.xml" static EXTRACTOR_KeywordList * addKeyword(EXTRACTOR_KeywordType type, char * keyword, EXTRACTOR_KeywordList * next) { EXTRACTOR_KeywordList * result; if (keyword == NULL) return next; result = malloc(sizeof(EXTRACTOR_KeywordList)); result->next = next; result->keyword = keyword; result->keywordType = type; return result; } typedef struct { char * text; EXTRACTOR_KeywordType type; } Matches; static Matches tmap[] = { { "meta:generator", EXTRACTOR_SOFTWARE }, { "meta:page-count", EXTRACTOR_PAGE_COUNT }, { "meta:creation-date", EXTRACTOR_CREATION_DATE }, { "dc:date", EXTRACTOR_DATE }, { "dc:creator", EXTRACTOR_CREATOR }, { "dc:language", EXTRACTOR_LANGUAGE }, { "dc:title", EXTRACTOR_TITLE }, { "dc:description", EXTRACTOR_DESCRIPTION }, { "dc:subject", EXTRACTOR_SUBJECT }, { "meta:keyword", EXTRACTOR_KEYWORDS }, { "meta:user-defined meta:name=\"Info 1\"", EXTRACTOR_UNKNOWN }, { "meta:user-defined meta:name=\"Info 2\"", EXTRACTOR_UNKNOWN }, { "meta:user-defined meta:name=\"Info 3\"", EXTRACTOR_UNKNOWN }, { "meta:user-defined meta:name=\"Info 4\"", EXTRACTOR_UNKNOWN }, { NULL, 0 }, }; /** * returns either zero when mimetype info is missing * or an already malloc'ed string containing the mimetype info. */ static char *libextractor_oo_getmimetype(unzFile uf) { char filename_inzip[MAXFILENAME]; unz_file_info file_info; char * buf = NULL; size_t buf_size = 0; if (UNZ_OK == unzLocateFile(uf, "mimetype", CASESENSITIVITY)) { if ( (UNZ_OK == unzGetCurrentFileInfo(uf, &file_info, filename_inzip, sizeof(filename_inzip), NULL, 0, NULL, 0) && (UNZ_OK == unzOpenCurrentFile3(uf,NULL, NULL, 0)) ) ) { buf_size = file_info.uncompressed_size; if (buf_size > 1024) { /* way too large! */ } else if (NULL == (buf = malloc(1 + buf_size))) { /* memory exhausted! */ } else if (buf_size != (size_t) unzReadCurrentFile(uf,buf,buf_size)) { free(buf); buf = NULL; } else { /* found something */ buf[buf_size] = '\0'; while ( (0 > buf_size) && isspace(buf[buf_size - 1])) buf[--buf_size] = '\0'; if('\0' == buf[0]) { free(buf); buf = NULL; } } } unzCloseCurrentFile(uf); } return buf; } typedef struct Ecls { char * data; size_t size; size_t pos; } Ecls; static voidpf Eopen_file_func (voidpf opaque, const char* filename, int mode) { if (0 == strcmp(filename, "ERROR")) return opaque; else return NULL; } static uLong Eread_file_func(voidpf opaque, voidpf stream, void* buf, uLong size) { Ecls * e = opaque; uLong ret; ret = e->size - e->pos; if (ret > size) ret = size; memcpy(buf, &e->data[e->pos], ret); e->pos += ret; return ret; } static long Etell_file_func(voidpf opaque, voidpf stream) { Ecls * e = opaque; return e->pos; } static long Eseek_file_func(voidpf opaque, voidpf stream, uLong offset, int origin) { Ecls * e = opaque; switch (origin) { case ZLIB_FILEFUNC_SEEK_SET: e->pos = offset; break; case ZLIB_FILEFUNC_SEEK_END: if (offset > e->size) return -1; e->pos = e->size - offset; break; case ZLIB_FILEFUNC_SEEK_CUR: if (offset < - e->pos) return -1; e->pos += offset; break; default: return -1; } return 0; } static int Eclose_file_func(voidpf opaque, voidpf stream) { return 0; } static int Etesterror_file_func(voidpf opaque, voidpf stream) { return 0; } struct EXTRACTOR_Keywords * libextractor_oo_extract(const char * filename, char * data, size_t size, struct EXTRACTOR_Keywords * prev) { char filename_inzip[MAXFILENAME]; unzFile uf; unz_file_info file_info; char * buf; char * pbuf; size_t buf_size; int i; zlib_filefunc_def io; Ecls cls; char * mimetype; if (size < 100) return prev; if ( !( ('P'==data[0]) && ('K'==data[1]) && (0x03==data[2]) && (0x04==data[3])) ) return prev; cls.data = data; cls.size = size; cls.pos = 0; io.zopen_file = &Eopen_file_func; io.zread_file = &Eread_file_func; io.zwrite_file = NULL; io.ztell_file = &Etell_file_func; io.zseek_file = &Eseek_file_func; io.zclose_file = &Eclose_file_func; io.zerror_file = &Etesterror_file_func; io.opaque = &cls; uf = unzOpen2("ERROR", &io); if (uf == NULL) return prev; mimetype = libextractor_oo_getmimetype(uf); if (NULL != mimetype) prev = addKeyword(EXTRACTOR_MIMETYPE, mimetype, EXTRACTOR_removeKeywordsOfType(prev, EXTRACTOR_MIMETYPE)); if (unzLocateFile(uf, METAFILE, CASESENSITIVITY) != UNZ_OK) { unzClose(uf); return prev; /* not found */ } if (UNZ_OK != unzGetCurrentFileInfo(uf, &file_info, filename_inzip, sizeof(filename_inzip), NULL,0,NULL,0)) { unzClose(uf); return prev; /* problems... */ } if (UNZ_OK != unzOpenCurrentFile3(uf, NULL, NULL, 0)) { unzClose(uf); return prev; /* problems... */ } buf_size = file_info.uncompressed_size; if (buf_size > 128 * 1024) { unzCloseCurrentFile(uf); unzClose(uf); return prev; /* hardly meta-data! */ } buf = malloc(buf_size+1); if (buf == NULL) { unzCloseCurrentFile(uf); unzClose(uf); return prev; /* out of memory */ } if (buf_size != unzReadCurrentFile(uf,buf,buf_size)) { free(buf); unzCloseCurrentFile(uf); unzClose(uf); return prev; } unzCloseCurrentFile(uf); /* we don't do "proper" parsing of the meta-data but rather use some heuristics to get values out that we understand */ buf[buf_size] = '\0'; /* printf("%s\n", buf); */ /* try to find some of the typical OO xml headers */ if ( (strstr(buf, "xmlns:meta=\"http://openoffice.org/2000/meta\"") != NULL) || (strstr(buf, "xmlns:dc=\"http://purl.org/dc/elements/1.1/\"") != NULL) || (strstr(buf, "xmlns:xlink=\"http://www.w3.org/1999/xlink\"") != NULL) ) { /* accept as meta-data */ i = -1; while (tmap[++i].text != NULL) { char * spos; char * epos; char needle[256]; char * key; int oc; pbuf = buf; while (1) { strcpy(needle, "<"); strcat(needle, tmap[i].text); strcat(needle, ">"); spos = strstr(pbuf, needle); if (NULL == spos) { strcpy(needle, tmap[i].text); strcat(needle, "=\""); spos = strstr(pbuf, needle); if (spos == NULL) break; spos += strlen(needle); epos = spos; while ( (epos[0] != '\0') && (epos[0] != '"') ) epos++; } else { oc = 0; spos += strlen(needle); while ( (spos[0] != '\0') && ( (spos[0] == '<') || (oc > 0) ) ) { if (spos[0] == '<') oc++; if (spos[0] == '>') oc--; spos++; } epos = spos; while ( (epos[0] != '\0') && (epos[0] != '<') && (epos[0] != '>') ) { epos++; } } if (spos != epos) { key = malloc(1+epos-spos); memcpy(key, spos, epos-spos); key[epos-spos] = '\0'; prev = addKeyword(tmap[i].type, key, prev); pbuf = epos; } else break; } } } free(buf); unzClose(uf); return prev; }