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https://github.com/zlib-ng/minizip-ng
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implement i/o improvements when searching for the central directory (http://mail.madler.net/pipermail/zlib-devel_madler.net/2012-February/002760.html)
This commit is contained in:
Nathan Moinvaziri
parent
76d6131670
commit
a39d6dfa81
186
unzip.c
186
unzip.c
@ -442,7 +442,6 @@ local ZPOS64_T unz64local_SearchCentralDir(const zlib_filefunc64_32_def* pzlib_f
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if (ZSEEK64(*pzlib_filefunc_def,filestream,0,ZLIB_FILEFUNC_SEEK_END) != 0)
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return 0;
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uSizeFile = ZTELL64(*pzlib_filefunc_def,filestream);
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if (uMaxBack>uSizeFile)
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@ -487,6 +486,7 @@ local ZPOS64_T unz64local_SearchCentralDir(const zlib_filefunc64_32_def* pzlib_f
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return uPosFound;
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}
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#define SIZECENTRALHEADERLOCATOR (0x14) /* 20 */
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/*
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Locate the Central directory 64 of a zipfile (at the end, just before
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@ -494,74 +494,36 @@ local ZPOS64_T unz64local_SearchCentralDir(const zlib_filefunc64_32_def* pzlib_f
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*/
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local ZPOS64_T unz64local_SearchCentralDir64 OF((
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const zlib_filefunc64_32_def* pzlib_filefunc_def,
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voidpf filestream));
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voidpf filestream,
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const ZPOS64_T endcentraloffset));
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local ZPOS64_T unz64local_SearchCentralDir64(const zlib_filefunc64_32_def* pzlib_filefunc_def,
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voidpf filestream)
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voidpf filestream,
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const ZPOS64_T endcentraloffset)
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{
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unsigned char* buf;
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ZPOS64_T uSizeFile;
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ZPOS64_T uBackRead;
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ZPOS64_T uMaxBack=0xffff; /* maximum size of global comment */
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ZPOS64_T uPosFound=0;
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uLong uL;
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ZPOS64_T relativeOffset;
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ZPOS64_T uPosFound;
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uLong uL;
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if (ZSEEK64(*pzlib_filefunc_def,filestream,0,ZLIB_FILEFUNC_SEEK_END) != 0)
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return 0;
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/* Given location of end of central offset record we can */
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relativeOffset = endcentraloffset + SIZECENTRALHEADERLOCATOR;
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uPosFound = ZTELL64(*pzlib_filefunc_def,filestream) - relativeOffset;
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uSizeFile = ZTELL64(*pzlib_filefunc_def,filestream);
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if (uMaxBack>uSizeFile)
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uMaxBack = uSizeFile;
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buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4);
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if (buf==NULL)
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return 0;
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uBackRead = 4;
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while (uBackRead<uMaxBack)
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{
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uLong uReadSize;
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ZPOS64_T uReadPos;
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int i;
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if (uBackRead+BUFREADCOMMENT>uMaxBack)
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uBackRead = uMaxBack;
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else
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uBackRead+=BUFREADCOMMENT;
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uReadPos = uSizeFile-uBackRead ;
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uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ?
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(BUFREADCOMMENT+4) : (uLong)(uSizeFile-uReadPos);
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if (ZSEEK64(*pzlib_filefunc_def,filestream,uReadPos,ZLIB_FILEFUNC_SEEK_SET)!=0)
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break;
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if (ZREAD64(*pzlib_filefunc_def,filestream,buf,uReadSize)!=uReadSize)
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break;
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for (i=(int)uReadSize-3; (i--)>0;)
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if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) &&
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((*(buf+i+2))==0x06) && ((*(buf+i+3))==0x07))
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{
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uPosFound = uReadPos+i;
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break;
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}
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if (uPosFound!=0)
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break;
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}
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TRYFREE(buf);
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if (uPosFound == 0)
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if (uPosFound <= 0)
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return 0;
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/* Zip64 end of central directory locator */
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if (ZSEEK64(*pzlib_filefunc_def,filestream, uPosFound,ZLIB_FILEFUNC_SEEK_SET)!=0)
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return 0;
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/* the signature, already checked */
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/* read locator signature */
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if (unz64local_getLong(pzlib_filefunc_def,filestream,&uL)!=UNZ_OK)
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return 0;
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if (uL != 0x07064b50)
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return 0;
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/* number of the disk with the start of the zip64 end of central directory */
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if (unz64local_getLong(pzlib_filefunc_def,filestream,&uL)!=UNZ_OK)
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@ -634,15 +596,69 @@ local unzFile unzOpenInternal (const void *path,
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return NULL;
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us.filestream_with_CD = us.filestream;
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central_pos = unz64local_SearchCentralDir64(&us.z_filefunc,us.filestream);
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us.isZip64 = 0;
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/* Use unz64local_SearchCentralDir first. Only based on the result
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is it necessary to locate the unz64local_SearchCentralDir64 */
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central_pos = unz64local_SearchCentralDir(&us.z_filefunc,us.filestream);
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if (central_pos)
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{
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if (ZSEEK64(us.z_filefunc, us.filestream,central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
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err=UNZ_ERRNO;
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/* the signature, already checked */
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if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
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err=UNZ_ERRNO;
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/* number of this disk */
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if (unz64local_getShort(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
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err=UNZ_ERRNO;
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us.number_disk = uL;
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/* number of the disk with the start of the central directory */
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if (unz64local_getShort(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
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err=UNZ_ERRNO;
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us.gi.number_disk_with_CD = uL;
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/* total number of entries in the central directory on this disk */
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if (unz64local_getShort(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
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err=UNZ_ERRNO;
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us.gi.number_entry = uL;
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/* total number of entries in the central directory */
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if (unz64local_getShort(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
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err=UNZ_ERRNO;
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number_entry_CD = uL;
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if (number_entry_CD!=us.gi.number_entry)
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err=UNZ_BADZIPFILE;
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/* size of the central directory */
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if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
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err=UNZ_ERRNO;
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us.size_central_dir = uL;
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/* offset of start of central directory with respect to the
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starting disk number */
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if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
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err=UNZ_ERRNO;
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us.offset_central_dir = uL;
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/* zipfile comment length */
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if (unz64local_getShort(&us.z_filefunc, us.filestream,&us.gi.size_comment)!=UNZ_OK)
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err=UNZ_ERRNO;
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if ((err==UNZ_OK) && ((us.size_central_dir==0xffff) || (us.offset_central_dir==0xffffffff)))
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{
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/* Format should be Zip64, as the central directory or file size is too large */
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central_pos = unz64local_SearchCentralDir64(&us.z_filefunc,us.filestream,central_pos);
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if (central_pos)
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{
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uLong uS;
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ZPOS64_T uL64;
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us.isZip64 = 1;
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if (ZSEEK64(us.z_filefunc, us.filestream, central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
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if (ZSEEK64(us.z_filefunc, us.filestream, central_pos, ZLIB_FILEFUNC_SEEK_SET)!=0)
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err=UNZ_ERRNO;
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/* the signature, already checked */
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@ -654,11 +670,11 @@ local unzFile unzOpenInternal (const void *path,
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err=UNZ_ERRNO;
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/* version made by */
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if (unz64local_getShort(&us.z_filefunc, us.filestream,&uS)!=UNZ_OK)
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if (unz64local_getShort(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
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err=UNZ_ERRNO;
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/* version needed to extract */
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if (unz64local_getShort(&us.z_filefunc, us.filestream,&uS)!=UNZ_OK)
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if (unz64local_getShort(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
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err=UNZ_ERRNO;
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/* number of this disk */
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@ -688,60 +704,13 @@ local unzFile unzOpenInternal (const void *path,
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starting disk number */
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if (unz64local_getLong64(&us.z_filefunc, us.filestream,&us.offset_central_dir)!=UNZ_OK)
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err=UNZ_ERRNO;
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us.gi.size_comment = 0;
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}
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else
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{
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central_pos = unz64local_SearchCentralDir(&us.z_filefunc,us.filestream);
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if (central_pos==0)
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err=UNZ_ERRNO;
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us.isZip64 = 0;
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if (ZSEEK64(us.z_filefunc, us.filestream, central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
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err=UNZ_ERRNO;
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/* the signature, already checked */
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if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
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err=UNZ_ERRNO;
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/* number of this disk */
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if (unz64local_getShort(&us.z_filefunc, us.filestream,&us.number_disk)!=UNZ_OK)
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err=UNZ_ERRNO;
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/* number of the disk with the start of the central directory */
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if (unz64local_getShort(&us.z_filefunc, us.filestream,&us.gi.number_disk_with_CD)!=UNZ_OK)
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err=UNZ_ERRNO;
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/* total number of entries in the central dir on this disk */
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if (unz64local_getShort(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
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err=UNZ_ERRNO;
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us.gi.number_entry = uL;
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/* total number of entries in the central dir */
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if (unz64local_getShort(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
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err=UNZ_ERRNO;
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number_entry_CD = uL;
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if (number_entry_CD!=us.gi.number_entry)
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err=UNZ_BADZIPFILE;
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/* size of the central directory */
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if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
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err=UNZ_ERRNO;
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us.size_central_dir = uL;
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/* offset of start of central directory with respect to the
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starting disk number */
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if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
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err=UNZ_ERRNO;
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us.offset_central_dir = uL;
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/* zipfile comment length */
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if (unz64local_getShort(&us.z_filefunc, us.filestream,&us.gi.size_comment)!=UNZ_OK)
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err=UNZ_ERRNO;
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}
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}
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else
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err=UNZ_ERRNO;
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if ((central_pos<us.offset_central_dir+us.size_central_dir) &&
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(err==UNZ_OK))
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@ -761,7 +730,7 @@ local unzFile unzOpenInternal (const void *path,
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s = (unz64_s*)ALLOC(sizeof(unz64_s));
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if ( s != NULL)
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if (s != NULL)
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{
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*s=us;
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unzGoToFirstFile((unzFile)s);
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@ -918,7 +887,6 @@ local int unz64local_GetCurrentFileInfoInternal (unzFile file,
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if (ZSEEK64(s->z_filefunc, s->filestream_with_CD, s->pos_in_central_dir+s->byte_before_the_zipfile, ZLIB_FILEFUNC_SEEK_SET)!=0)
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err=UNZ_ERRNO;
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/* we check the magic */
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if (err==UNZ_OK)
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{
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164
zip.c
164
zip.c
@ -669,20 +669,28 @@ local ZPOS64_T zip64local_SearchCentralDir(const zlib_filefunc64_32_def* pzlib_f
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return zip64local_SearchCentralDirInternal(pzlib_filefunc_def, filestream, 0x504b0506);
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}
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#define SIZECENTRALHEADERLOCATOR (0x14) /* 20 */
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/*
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Locate the End of Zip64 Central directory locator and from there find the CD of a zipfile (at the end, just before
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the global comment)
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Locate the Central directory 64 of a zipfile (at the end, just before
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the global comment)
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*/
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local ZPOS64_T zip64local_SearchCentralDir64 OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream));
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local ZPOS64_T zip64local_SearchCentralDir64 OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, const ZPOS64_T endcentraloffset));
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local ZPOS64_T zip64local_SearchCentralDir64(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream)
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local ZPOS64_T zip64local_SearchCentralDir64(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, const ZPOS64_T endcentraloffset)
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{
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ZPOS64_T uPosFound=0;
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uLong uL;
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ZPOS64_T relativeOffset;
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ZPOS64_T uPosFound;
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uLong uL;
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uPosFound = zip64local_SearchCentralDirInternal(pzlib_filefunc_def, filestream, 0x504b0607);
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if (uPosFound == 0)
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if (ZSEEK64(*pzlib_filefunc_def,filestream,0,ZLIB_FILEFUNC_SEEK_END) != 0)
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return 0;
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/* Given location of end of central offset record we can */
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relativeOffset = endcentraloffset + SIZECENTRALHEADERLOCATOR;
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uPosFound = ZTELL64(*pzlib_filefunc_def,filestream) - relativeOffset;
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if (uPosFound <= 0)
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return 0;
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/* Zip64 end of central directory locator */
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@ -738,81 +746,17 @@ int LoadCentralDirectoryRecord(zip64_internal* pziinit)
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uLong VersionMadeBy;
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uLong VersionNeeded;
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uLong size_comment;
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int hasZIP64Record = 0;
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// check first if we find a ZIP64 record
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central_pos = zip64local_SearchCentralDir64(&pziinit->z_filefunc,pziinit->filestream);
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if (central_pos > 0)
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{
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hasZIP64Record = 1;
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}
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else if (central_pos == 0)
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{
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central_pos = zip64local_SearchCentralDir(&pziinit->z_filefunc,pziinit->filestream);
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}
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/* disable to allow appending to empty ZIP archive
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/* disable to allow appending to empty ZIP archive (must be standard zip, not zip64)
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if (central_pos==0)
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err=ZIP_ERRNO;
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*/
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if(hasZIP64Record)
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if(err == ZIP_OK)
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{
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ZPOS64_T sizeEndOfCentralDirectory;
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if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, central_pos, ZLIB_FILEFUNC_SEEK_SET) != 0)
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err=ZIP_ERRNO;
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/* the signature, already checked */
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if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&uL)!=ZIP_OK)
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err=ZIP_ERRNO;
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/* size of zip64 end of central directory record */
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if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream, &sizeEndOfCentralDirectory)!=ZIP_OK)
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err=ZIP_ERRNO;
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/* version made by */
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if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &VersionMadeBy)!=ZIP_OK)
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err=ZIP_ERRNO;
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/* version needed to extract */
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if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &VersionNeeded)!=ZIP_OK)
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err=ZIP_ERRNO;
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/* number of this disk */
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if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&pziinit->number_disk)!=ZIP_OK)
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err=ZIP_ERRNO;
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/* number of the disk with the start of the central directory */
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if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&pziinit->number_disk_with_CD)!=ZIP_OK)
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err=ZIP_ERRNO;
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/* total number of entries in the central directory on this disk */
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if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream, &number_entry)!=ZIP_OK)
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err=ZIP_ERRNO;
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/* total number of entries in the central directory */
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if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&number_entry_CD)!=ZIP_OK)
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err=ZIP_ERRNO;
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if (number_entry_CD!=number_entry)
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err=ZIP_BADZIPFILE;
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/* size of the central directory */
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if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&size_central_dir)!=ZIP_OK)
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err=ZIP_ERRNO;
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/* offset of start of central directory with respect to the starting disk number */
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if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&offset_central_dir)!=ZIP_OK)
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err=ZIP_ERRNO;
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// TODO..
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// read the comment from the standard central header.
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size_comment = 0;
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}
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else
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{
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// Read End of central Directory info
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/* read end of central directory info */
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if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
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err=ZIP_ERRNO;
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@ -862,6 +806,68 @@ int LoadCentralDirectoryRecord(zip64_internal* pziinit)
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/* zipfile global comment length */
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if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &size_comment)!=ZIP_OK)
|
||||
err=ZIP_ERRNO;
|
||||
|
||||
if ((err==ZIP_OK) && ((number_entry_CD==0xffff) || (offset_central_dir==0xffffffff)))
|
||||
{
|
||||
/* Format should be Zip64, as the central directory or file size is too large */
|
||||
|
||||
central_pos = zip64local_SearchCentralDir64(&pziinit->z_filefunc,pziinit->filestream,central_pos);
|
||||
if (central_pos)
|
||||
{
|
||||
ZPOS64_T sizeEndOfCentralDirectory;
|
||||
|
||||
hasZIP64Record = 1;
|
||||
|
||||
if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, central_pos, ZLIB_FILEFUNC_SEEK_SET) != 0)
|
||||
err=ZIP_ERRNO;
|
||||
|
||||
/* the signature, already checked */
|
||||
if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&uL)!=ZIP_OK)
|
||||
err=ZIP_ERRNO;
|
||||
|
||||
/* size of zip64 end of central directory record */
|
||||
if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream, &sizeEndOfCentralDirectory)!=ZIP_OK)
|
||||
err=ZIP_ERRNO;
|
||||
|
||||
/* version made by */
|
||||
if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &VersionMadeBy)!=ZIP_OK)
|
||||
err=ZIP_ERRNO;
|
||||
|
||||
/* version needed to extract */
|
||||
if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &VersionNeeded)!=ZIP_OK)
|
||||
err=ZIP_ERRNO;
|
||||
|
||||
/* number of this disk */
|
||||
if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream, &pziinit->number_disk)!=ZIP_OK)
|
||||
err=ZIP_ERRNO;
|
||||
|
||||
/* number of the disk with the start of the central directory */
|
||||
if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream, &pziinit->number_disk_with_CD)!=ZIP_OK)
|
||||
err=ZIP_ERRNO;
|
||||
|
||||
/* total number of entries in the central directory on this disk */
|
||||
if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream, &number_entry)!=ZIP_OK)
|
||||
err=ZIP_ERRNO;
|
||||
|
||||
/* total number of entries in the central directory */
|
||||
if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&number_entry_CD)!=ZIP_OK)
|
||||
err=ZIP_ERRNO;
|
||||
|
||||
if (number_entry_CD!=number_entry)
|
||||
err=ZIP_BADZIPFILE;
|
||||
|
||||
/* size of the central directory */
|
||||
if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&size_central_dir)!=ZIP_OK)
|
||||
err=ZIP_ERRNO;
|
||||
|
||||
/* offset of start of central directory with respect to the
|
||||
starting disk number */
|
||||
if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&offset_central_dir)!=ZIP_OK)
|
||||
err=ZIP_ERRNO;
|
||||
}
|
||||
else
|
||||
err=ZIP_BADZIPFILE;
|
||||
}
|
||||
}
|
||||
|
||||
if ((central_pos<offset_central_dir+size_central_dir) &&
|
||||
@ -2124,6 +2130,7 @@ int Write_Zip64EndOfCentralDirectoryRecord(zip64_internal* zi, uLong size_centra
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
int Write_EndOfCentralDirectoryRecord(zip64_internal* zi, uLong size_centraldir, ZPOS64_T centraldir_pos_inzip)
|
||||
{
|
||||
int err = ZIP_OK;
|
||||
@ -2140,7 +2147,7 @@ int Write_EndOfCentralDirectoryRecord(zip64_internal* zi, uLong size_centraldir,
|
||||
if (err==ZIP_OK) /* total number of entries in the central dir on this disk */
|
||||
{
|
||||
{
|
||||
if(zi->number_entry >= 0xFFFF)
|
||||
if(zi->number_entry >= 0xffff)
|
||||
err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0xffff,2); // use value in ZIP64 record
|
||||
else
|
||||
err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->number_entry,2);
|
||||
@ -2149,7 +2156,7 @@ int Write_EndOfCentralDirectoryRecord(zip64_internal* zi, uLong size_centraldir,
|
||||
|
||||
if (err==ZIP_OK) /* total number of entries in the central dir */
|
||||
{
|
||||
if(zi->number_entry >= 0xFFFF)
|
||||
if(zi->number_entry >= 0xffff)
|
||||
err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0xffff,2); // use value in ZIP64 record
|
||||
else
|
||||
err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->number_entry,2);
|
||||
@ -2241,11 +2248,10 @@ extern int ZEXPORT zipClose (zipFile file, const char* global_comment)
|
||||
free_linkedlist(&(zi->central_dir));
|
||||
|
||||
pos = centraldir_pos_inzip - zi->add_position_when_writting_offset;
|
||||
if (pos >= 0xffffffff || zi->number_entry > 0xFFFF)
|
||||
if (pos >= 0xffffffff || zi->number_entry > 0xffff)
|
||||
{
|
||||
ZPOS64_T Zip64EOCDpos = ZTELL64(zi->z_filefunc,zi->filestream);
|
||||
Write_Zip64EndOfCentralDirectoryRecord(zi, size_centraldir, centraldir_pos_inzip);
|
||||
|
||||
Write_Zip64EndOfCentralDirectoryLocator(zi, Zip64EOCDpos);
|
||||
}
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user