unzip.c
上传用户:maxiaolivb
上传日期:2022-06-07
资源大小:915k
文件大小:39k
- /* unzip.c -- IO for uncompress .zip files using zlib
- Version 1.01, May 8th, 2004
- Copyright (C) 1998-2004 Gilles Vollant
- Read unzip.h for more info
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include "zlib.h"
- #include "unzip.h"
- #ifdef STDC
- #include <stddef.h>
- #include <string.h>
- #include <stdlib.h>
- #endif
- #ifdef NO_ERRNO_H
- extern int errno;
- #else
- #include <errno.h>
- #endif
- /* compile with -Dlocal if your debugger can't find static symbols */
- #ifndef CASESENSITIVITYDEFAULT_NO
- #if !defined(unix) && !defined(CASESENSITIVITYDEFAULT_YES)
- #define CASESENSITIVITYDEFAULT_NO
- #endif
- #endif
- #ifndef UNZ_BUFSIZE
- #define UNZ_BUFSIZE (32768)
- #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)
- /* unz_file_info_interntal contain internal info about a file in zipfile*/
- typedef struct unz_file_info_internal_s
- {
- DWORD 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 */
- DWORD pos_in_zipfile; /* position in byte on the zipfile, for fseek*/
- DWORD stream_initialised; /* flag set if stream structure is initialised*/
- DWORD offset_local_extrafield; /* offset of the local extra field */
- DWORD size_local_extrafield; /* size of the local extra field */
- DWORD pos_local_extrafield; /* position in the local extra field in read*/
- DWORD crc32; /* crc32 of all data uncompressed */
- DWORD crc32_wait; /* crc32 we must obtain after decompress all */
- DWORD rest_read_compressed; /* number of byte to be decompressed */
- DWORD rest_read_uncompressed; /*number of byte to be obtained after decomp*/
- zlib_filefunc_def z_filefunc;
- void *filestream; /* io structore of the zipfile */
- DWORD compression_method; /* compression method (0==store) */
- DWORD 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;
- void *filestream; /* io structore of the zipfile */
- unz_global_info gi; /* public global information */
- DWORD byte_before_the_zipfile; /* byte before the zipfile, (>0 for sfx)*/
- DWORD num_file; /* number of the current file in the zipfile*/
- DWORD pos_in_central_dir; /* pos of the current file in the central dir*/
- DWORD current_file_ok; /* flag about the usability of the current file*/
- DWORD central_pos; /* position of the beginning of the central dir*/
- DWORD size_central_dir; /* size of the central directory */
- DWORD 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;
- #ifndef NOUNCRYPT
- DWORD keys[3]; /* keys defining the pseudo-random sequence */
- const DWORD *pcrc_32_tab;
- #endif
- } unz_s;
- #ifndef NOUNCRYPT
- #include "crypt.h"
- #endif
- /* ===========================================================================
- 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(const zlib_filefunc_def *pzlib_filefunc_def, void *filestream, int *pi)
- {
- BYTE 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(const zlib_filefunc_def *pzlib_filefunc_def, void *filestream, DWORD *pX)
- {
- DWORD x;
- int i;
- int err;
- err = unzlocal_getByte(pzlib_filefunc_def, filestream, &i);
- x = (DWORD)i;
- if (err == UNZ_OK)
- {
- err = unzlocal_getByte(pzlib_filefunc_def, filestream, &i);
- }
- x += ((DWORD)i) << 8;
- if (err == UNZ_OK)
- {
- *pX = x;
- }
- else
- {
- *pX = 0;
- }
- return err;
- }
- //-------------------------------------------------------------------------
- static int unzlocal_getLong(const zlib_filefunc_def *pzlib_filefunc_def, void *filestream, DWORD *pX)
- {
- DWORD x;
- int i;
- int err;
- err = unzlocal_getByte(pzlib_filefunc_def, filestream, &i);
- x = (DWORD)i;
- if (err == UNZ_OK)
- {
- err = unzlocal_getByte(pzlib_filefunc_def, filestream, &i);
- }
- x += ((DWORD)i) << 8;
- if (err == UNZ_OK)
- {
- err = unzlocal_getByte(pzlib_filefunc_def, filestream, &i);
- }
- x += ((DWORD)i) << 16;
- if (err == UNZ_OK)
- {
- err = unzlocal_getByte(pzlib_filefunc_def, filestream, &i);
- }
- x += ((DWORD)i) << 24;
- if (err == UNZ_OK)
- {
- *pX = x;
- }
- else
- {
- *pX = 0;
- }
- return err;
- }
- //-------------------------------------------------------------------------
- #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(const char *fileName1, const char *fileName2, int iCaseSensitivity)
- {
- if (iCaseSensitivity == 0)
- {
- iCaseSensitivity = CASESENSITIVITYDEFAULTVALUE;
- }
- if (iCaseSensitivity == 1)
- {
- return strcmp(fileName1, fileName2);
- }
- return stricmp(fileName1, fileName2);
- }
- */
- //-------------------------------------------------------------------------
- #ifndef BUFREADCOMMENT
- #define BUFREADCOMMENT (0x400)
- #endif
- /*
- Locate the Central directory of a zipfile (at the end, just before
- the global comment)
- */
- static DWORD unzlocal_SearchCentralDir(const zlib_filefunc_def *pzlib_filefunc_def, void *filestream)
- {
- BYTE *buf;
- DWORD uSizeFile;
- DWORD uBackRead;
- DWORD uMaxBack = 0xffff; /* maximum size of global comment */
- DWORD uPosFound = 0;
- if (ZSEEK(*pzlib_filefunc_def, filestream, 0, SEEK_END) != 0)
- {
- return 0;
- }
- uSizeFile = ZTELL(*pzlib_filefunc_def, filestream);
- if (uMaxBack > uSizeFile)
- {
- uMaxBack = uSizeFile;
- }
- buf = (BYTE*)ALLOC(BUFREADCOMMENT + 4);
- if (buf == NULL)
- {
- return 0;
- }
- uBackRead = 4;
- while (uBackRead < uMaxBack)
- {
- DWORD 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 (ZSEEK(*pzlib_filefunc_def, filestream, uReadPos, 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;
- }
- /*
- 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.
- */
- extern unzFile ZEXPORT unzOpen2(const char *path, zlib_filefunc_def *pzlib_filefunc_def)
- {
- unz_s us;
- unz_s *s;
- DWORD central_pos, uL;
- DWORD number_disk; /* number of the current dist, used for
- spaning ZIP, unsupported, always 0*/
- DWORD number_disk_with_CD; /* number the the disk with central dir, used
- for spaning ZIP, unsupported, always 0*/
- DWORD number_entry_CD; /* total number of entries in
- the central dir
- (same than number_entry on nospan) */
- int err = UNZ_OK;
- if (pzlib_filefunc_def == NULL)
- {
- fill_fopen_filefunc(&us.z_filefunc);
- }
- else
- {
- 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, 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_pos < us.offset_central_dir + us.size_central_dir) && (err == UNZ_OK))
- {
- err = UNZ_BADZIPFILE;
- }
- if (err != UNZ_OK)
- {
- ZCLOSE(us.z_filefunc, us.filestream);
- return NULL;
- }
- 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;
- us.encrypted = 0;
- s = (unz_s*)ALLOC(sizeof(unz_s));
- *s = us;
- unzGoToFirstFile((unzFile)s);
- return (unzFile)s;
- }
- //-------------------------------------------------------------------------
- extern unzFile ZEXPORT unzOpen(const char *path)
- {
- return unzOpen2(path, NULL);
- }
- /*
- Close a ZipFile opened with unzipOpen.
- If there is files inside the .Zip opened with unzipOpenCurrentFile (see later),
- these files MUST be closed with unzipCloseCurrentFile before call unzipClose.
- return UNZ_OK if there is no problem. */
- extern int ZEXPORT unzClose(unzFile file)
- {
- unz_s *s;
- if (file == 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. */
- /*
- extern int ZEXPORT unzGetGlobalInfo(unzFile file, unz_global_info *pglobal_info)
- {
- unz_s *s;
- if (file == NULL)
- {
- return UNZ_PARAMERROR;
- }
- s = (unz_s*)file;
- *pglobal_info = s->gi;
- return UNZ_OK;
- }
- */
- /*
- Translate date/time from Dos format to tm_unz (readable more easilty)
- */
- static void unzlocal_DosDateToTmuDate(DWORD ulDosDate, tm_unz *ptm)
- {
- DWORD uDate;
- uDate = (DWORD)(ulDosDate >> 16);
- ptm->tm_mday = (DWORD)(uDate &0x1f);
- ptm->tm_mon = (DWORD)((((uDate) &0x1E0) / 0x20) - 1);
- ptm->tm_year = (DWORD)(((uDate &0x0FE00) / 0x0200) + 1980);
- ptm->tm_hour = (DWORD)((ulDosDate &0xF800) / 0x800);
- ptm->tm_min = (DWORD)((ulDosDate &0x7E0) / 0x20);
- ptm->tm_sec = (DWORD)(2 *(ulDosDate &0x1f));
- }
- /*
- Get Info about the current file in the zipfile, with internal only info
- */
- static int unzlocal_GetCurrentFileInfoInternal(unzFile file, unz_file_info *pfile_info, unz_file_info_internal *pfile_info_internal, char *szFileName, DWORD fileNameBufferSize, void *extraField, DWORD extraFieldBufferSize, char *szComment, DWORD commentBufferSize)
- {
- unz_s *s;
- unz_file_info file_info;
- unz_file_info_internal file_info_internal;
- int err = UNZ_OK;
- DWORD 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, 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))
- {
- DWORD uSizeRead;
- if (file_info.size_filename < fileNameBufferSize)
- {
- *(szFileName + file_info.size_filename) = ' ';
- uSizeRead = file_info.size_filename;
- }
- else
- {
- uSizeRead = fileNameBufferSize;
- }
- if ((file_info.size_filename > 0) && (fileNameBufferSize > 0))
- if (ZREAD(s->z_filefunc, s->filestream, szFileName, uSizeRead) != uSizeRead)
- {
- err = UNZ_ERRNO;
- }
- lSeek -= uSizeRead;
- }
- if ((err == UNZ_OK) && (extraField != NULL))
- {
- DWORD uSizeRead;
- if (file_info.size_file_extra < extraFieldBufferSize)
- {
- uSizeRead = file_info.size_file_extra;
- }
- else
- {
- uSizeRead = extraFieldBufferSize;
- }
- if (lSeek != 0)
- {
- if (ZSEEK(s->z_filefunc, s->filestream, lSeek, 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))
- {
- DWORD uSizeRead;
- if (file_info.size_file_comment < commentBufferSize)
- {
- *(szComment + file_info.size_file_comment) = ' ';
- uSizeRead = file_info.size_file_comment;
- }
- else
- {
- uSizeRead = commentBufferSize;
- }
- if (lSeek != 0)
- {
- if (ZSEEK(s->z_filefunc, s->filestream, lSeek, 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;
- }
- /*
- Write info about the ZipFile in the *pglobal_info structure.
- No preparation of the structure is needed
- return UNZ_OK if there is no problem.
- */
- extern int ZEXPORT unzGetCurrentFileInfo(unzFile file, unz_file_info *pfile_info, char *szFileName, DWORD fileNameBufferSize, void *extraField, DWORD extraFieldBufferSize, char *szComment, DWORD commentBufferSize)
- {
- return unzlocal_GetCurrentFileInfoInternal(file, pfile_info, NULL, szFileName, fileNameBufferSize, extraField, extraFieldBufferSize, szComment, commentBufferSize);
- }
- /*
- Set the current file of the zipfile to the first file.
- return UNZ_OK if there is no problem
- */
- extern int ZEXPORT unzGoToFirstFile(unzFile file)
- {
- int err = UNZ_OK;
- unz_s *s;
- if (file == 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(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->gi.number_entry != 0xffff)
- {
- /* 2^16 files overflow hack */
- if (s->num_file + 1 == s->gi.number_entry)
- {
- return UNZ_END_OF_LIST_OF_FILE;
- }
- }
- s->pos_in_central_dir += SIZECENTRALDIRITEM + s->cur_file_info.size_filename + s->cur_file_info.size_file_extra + s->cur_file_info.size_file_comment;
- s->num_file++;
- err = unzlocal_GetCurrentFileInfoInternal(file, &s->cur_file_info, &s->cur_file_info_internal, NULL, 0, NULL, 0, NULL, 0);
- s->current_file_ok = (err == UNZ_OK);
- return err;
- }
- extern int ZEXPORT unzGetCurrentFileID(unzFile file, DWORD *file_num, DWORD *pos_in_central_dir)
- {
- unz_s *s;
- if (file == NULL)
- {
- return UNZ_PARAMERROR;
- }
- s = (unz_s*)file;
- *file_num = s->num_file;
- *pos_in_central_dir = s->pos_in_central_dir;
- return UNZ_OK;
- }
- extern int ZEXPORT unzGoToFileID(unzFile file, DWORD file_num, DWORD pos_in_central_dir)
- {
- unz_s *s;
- int err;
- if (file == NULL)
- {
- return UNZ_PARAMERROR;
- }
-
- s = (unz_s*)file;
- s->num_file = file_num;
- s->pos_in_central_dir = pos_in_central_dir;
- 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
- */
- //-------------------------------------------------------------------------
- /*
- // Unzip Helper Functions - should be here?
- ///////////////////////////////////////////
- */
- /*
- 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(unz_s *s, DWORD *piSizeVar, DWORD *poffset_local_extrafield, DWORD *psize_local_extrafield)
- {
- DWORD uMagic, uData, uFlags;
- DWORD size_filename;
- DWORD 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, 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;
- }
- 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 += (DWORD)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 = (DWORD)size_extra_field;
- *piSizeVar += (DWORD)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 unzOpenCurrentFile3(unzFile file, int *method, int *level, int raw, const char *password)
- {
- int err = UNZ_OK;
- DWORD iSizeVar;
- unz_s *s;
- file_in_zip_read_info_s *pfile_in_zip_read_info;
- DWORD offset_local_extrafield; // offset of the local extra field
- DWORD size_local_extrafield; // size of the local extra field
- #ifndef NOUNCRYPT
- char source[12];
- #else
- if (password != NULL)
- {
- return UNZ_PARAMERROR;
- }
- #endif
- 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 = (void*)0;
- pfile_in_zip_read_info->stream.next_in = (void*)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 = (DWORD)0;
- s->pfile_in_zip_read = pfile_in_zip_read_info;
- #ifndef NOUNCRYPT
- if (password != NULL)
- {
- int i;
- s->pcrc_32_tab = get_crc_table();
- init_keys(password, s->keys, s->pcrc_32_tab);
- if (ZSEEK(s->z_filefunc, s->filestream, s->pfile_in_zip_read->pos_in_zipfile + s->pfile_in_zip_read->byte_before_the_zipfile, SEEK_SET) != 0)
- {
- return UNZ_INTERNALERROR;
- }
- if (ZREAD(s->z_filefunc, s->filestream, source, 12) < 12)
- {
- return UNZ_INTERNALERROR;
- }
- for (i = 0; i < 12; i++)
- {
- zdecode(s->keys, s->pcrc_32_tab, source[i]);
- }
- s->pfile_in_zip_read->pos_in_zipfile += 12;
- s->encrypted = 1;
- }
- #endif
- return UNZ_OK;
- }
- //-------------------------------------------------------------------------
- extern int ZEXPORT unzOpenCurrentFile(unzFile file)
- {
- return unzOpenCurrentFile3(file, NULL, NULL, 0, NULL);
- }
- //-------------------------------------------------------------------------
- extern int ZEXPORT unzOpenCurrentFilePassword(unzFile file, const char *password)
- {
- return unzOpenCurrentFile3(file, NULL, NULL, 0, password);
- }
- //-------------------------------------------------------------------------
- /*
- Read bytes from the current file.
- buf contain buffer where data must be copied
- len the size of buf.
- return the number of byte copied if somes bytes are copied
- return 0 if the end of file was reached
- return <0 with error code if there is an error
- (UNZ_ERRNO for IO error, or zLib error for uncompress error)
- */
- extern int ZEXPORT unzReadCurrentFile(unzFile file, void *buf, DWORD len)
- {
- int err = UNZ_OK;
- DWORD 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 = (BYTE*)buf;
- pfile_in_zip_read_info->stream.avail_out = (DWORD)len;
- if (len > pfile_in_zip_read_info->rest_read_uncompressed)
- {
- pfile_in_zip_read_info->stream.avail_out = (DWORD)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))
- {
- DWORD uReadThis = UNZ_BUFSIZE;
- if (pfile_in_zip_read_info->rest_read_compressed < uReadThis)
- {
- uReadThis = (DWORD)pfile_in_zip_read_info->rest_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, 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;
- }
- #ifndef NOUNCRYPT
- if (s->encrypted)
- {
- DWORD i;
- for (i = 0; i < uReadThis; i++)
- {
- pfile_in_zip_read_info->read_buffer[i] = zdecode(s->keys, s->pcrc_32_tab, pfile_in_zip_read_info->read_buffer[i]);
- }
- }
- #endif
- 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 = (BYTE*)pfile_in_zip_read_info->read_buffer;
- pfile_in_zip_read_info->stream.avail_in = (DWORD)uReadThis;
- }
- if ((pfile_in_zip_read_info->compression_method == 0) || (pfile_in_zip_read_info->raw))
- {
- DWORD 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; 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
- {
- DWORD uTotalOutBefore, uTotalOutAfter;
- const BYTE *bufBefore;
- DWORD uOutThis;
- int flush = Z_SYNC_FLUSH;
- uTotalOutBefore = pfile_in_zip_read_info->stream.total_out;
- bufBefore = pfile_in_zip_read_info->stream.next_out;
- err = inflate(&pfile_in_zip_read_info->stream, flush);
- uTotalOutAfter = pfile_in_zip_read_info->stream.total_out;
- uOutThis = uTotalOutAfter - uTotalOutBefore;
- pfile_in_zip_read_info->crc32 = crc32(pfile_in_zip_read_info->crc32, bufBefore, (DWORD)(uOutThis));
- pfile_in_zip_read_info->rest_read_uncompressed -= uOutThis;
- iRead += (DWORD)(uTotalOutAfter - uTotalOutBefore);
- if (err == Z_STREAM_END)
- {
- return (iRead == 0) ? UNZ_EOF : iRead;
- }
- if (err != Z_OK)
- {
- break;
- }
- }
- }
- if (err == Z_OK)
- {
- return iRead;
- }
- return err;
- }
- /*
- Give the current position in uncompressed data
- */
- /*
- extern z_off_t ZEXPORT unztell(unzFile file)
- {
- unz_s *s;
- file_in_zip_read_info_s *pfile_in_zip_read_info;
- if (file == 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(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(unzFile file, void *buf, DWORD len)
- {
- unz_s *s;
- file_in_zip_read_info_s *pfile_in_zip_read_info;
- DWORD read_now;
- DWORD 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 = (DWORD)size_to_read;
- }
- else
- {
- read_now = (DWORD)len;
- }
- if (read_now == 0)
- {
- return 0;
- }
- if (ZSEEK(pfile_in_zip_read_info->z_filefunc, pfile_in_zip_read_info->filestream, pfile_in_zip_read_info->offset_local_extrafield + pfile_in_zip_read_info->pos_local_extrafield, SEEK_SET) != 0)
- {
- return UNZ_ERRNO;
- }
- if (ZREAD(pfile_in_zip_read_info->z_filefunc, pfile_in_zip_read_info->filestream, buf, read_now) != read_now)
- {
- return UNZ_ERRNO;
- }
- return (int)read_now;
- }
- */
- /*
- Close the file in zip opened with unzipOpenCurrentFile
- Return UNZ_CRCERROR if all the file was read but the CRC is not good
- */
- extern int ZEXPORT unzCloseCurrentFile(unzFile file)
- {
- int err = UNZ_OK;
- unz_s *s;
- file_in_zip_read_info_s *pfile_in_zip_read_info;
- if (file == 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) && (!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;
- }
- /*
- Get the global comment string of the ZipFile, in the szComment buffer.
- uSizeBuf is the size of the szComment buffer.
- return the number of byte copied or an error code <0
- */
- /*
- extern int ZEXPORT unzGetGlobalComment(unzFile file, char *szComment, DWORD uSizeBuf)
- {
- //int err = UNZ_OK;
- unz_s *s;
- DWORD 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 (ZSEEK(s->z_filefunc, s->filestream, s->central_pos + 22, SEEK_SET) != 0)
- {
- return UNZ_ERRNO;
- }
- if (uReadThis > 0)
- {
- *szComment = ' ';
- if (ZREAD(s->z_filefunc, s->filestream, szComment, uReadThis) != uReadThis)
- {
- return UNZ_ERRNO;
- }
- }
- if ((szComment != NULL) && (uSizeBuf > s->gi.size_comment))
- {
- *(szComment + s->gi.size_comment) = ' ';
- }
- return (int)uReadThis;
- }
- */