diff options
author | Kitty Draper | 2011-03-05 21:39:25 -0500 |
---|---|---|
committer | Kitty Draper | 2011-03-05 21:39:25 -0500 |
commit | d40ae99422e118188a7f48055dc340c6aca022aa (patch) | |
tree | 83ab93f49fd9e66e43bcd824091ae1dbcaa0c173 /source/unzip/unzip.c | |
download | snes9x2005-d40ae99422e118188a7f48055dc340c6aca022aa.tar.gz snes9x2005-d40ae99422e118188a7f48055dc340c6aca022aa.tar.bz2 snes9x2005-d40ae99422e118188a7f48055dc340c6aca022aa.zip |
first commit
Diffstat (limited to 'source/unzip/unzip.c')
-rw-r--r-- | source/unzip/unzip.c | 1224 |
1 files changed, 1224 insertions, 0 deletions
diff --git a/source/unzip/unzip.c b/source/unzip/unzip.c new file mode 100644 index 0000000..54695c2 --- /dev/null +++ b/source/unzip/unzip.c @@ -0,0 +1,1224 @@ +/* + * unzip.c -- IO on .zip files using zlib Version 0.15 beta, Mar 19th, 1998, + * + * Read unzip.h for more info + */ + + +//#include <stdio.h> +//#include <stdlib.h> +#include "fs_api.h" +#include "ds2_malloc.h" +#include <string.h> +#include "zlib.h" +#include "unzip.h" +#include "unzipP.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 + +const char unz_copyright[] = +" unzip 0.15 Copyright 1998 Gilles Vollant "; + +void unShrink (); +void unReduce (); +int explode (); + +/* + * =========================================================================== + * Read a byte from a gz_stream; update next_in and avail_in. Return EOF for + * end of file. IN assertion: the stream s has been sucessfully opened for + * reading. + */ + + +local int +unzlocal_getByte (FILE * fin, int *pi) +{ + unsigned char c; + int err = fread (&c, 1, 1, fin); + if (err == 1) + { + *pi = (int) c; + return UNZ_OK; + } else + { + if (ferror (fin)) + return UNZ_ERRNO; + else + return UNZ_EOF; + } +} + + +/* + * =========================================================================== + * Reads a long in LSB order from the given gz_stream. Sets + */ +local int +unzlocal_getShort (FILE * fin, uLong * pX) +{ + uLong x; + int i; + int err; + + err = unzlocal_getByte (fin, &i); + x = (uLong) i; + + if (err == UNZ_OK) + err = unzlocal_getByte (fin, &i); + x += ((uLong) i) << 8; + + if (err == UNZ_OK) + *pX = x; + else + *pX = 0; + return err; +} + +local int +unzlocal_getLong (FILE * fin, uLong * pX) +{ + uLong x; + int i; + int err; + + err = unzlocal_getByte (fin, &i); + x = (uLong) i; + + if (err == UNZ_OK) + err = unzlocal_getByte (fin, &i); + x += ((uLong) i) << 8; + + if (err == UNZ_OK) + err = unzlocal_getByte (fin, &i); + x += ((uLong) i) << 16; + + if (err == UNZ_OK) + err = unzlocal_getByte (fin, &i); + x += ((uLong) i) << 24; + + if (err == UNZ_OK) + *pX = x; + else + *pX = 0; + return err; +} + + +/* My own strcmpi / strcasecmp */ +local int +strcmpcasenosensitive_internal (const char *fileName1, const char *fileName2) +{ + for (;;) + { + char c1 = *(fileName1++); + char c2 = *(fileName2++); + if ((c1 >= 'a') && (c1 <= 'z')) + c1 -= 0x20; + if ((c2 >= 'a') && (c2 <= 'z')) + c2 -= 0x20; + if (c1 == '\0') + return ((c2 == '\0') ? 0 : -1); + if (c2 == '\0') + return 1; + if (c1 < c2) + return -1; + if (c1 > c2) + return 1; + } +} + + +#ifdef CASESENSITIVITYDEFAULT_NO +#define CASESENSITIVITYDEFAULTVALUE 2 +#else +#define CASESENSITIVITYDEFAULTVALUE 1 +#endif + +#ifndef STRCMPCASENOSENTIVEFUNCTION +#define STRCMPCASENOSENTIVEFUNCTION strcmpcasenosensitive_internal +#endif + +/* + * Compare two filename (fileName1,fileName2). If iCaseSenisivity = 1, + * comparision is case sensitivity (like strcmp) If iCaseSenisivity = 2, + * comparision is not case sensitivity (like strcmpi or strcasecmp) If + * iCaseSenisivity = 0, case sensitivity is defaut of your operating system + * (like 1 on Unix, 2 on Windows) + * + */ +extern int ZEXPORT +unzStringFileNameCompare (const char *fileName1, const char *fileName2, int iCaseSensitivity) +{ + if (iCaseSensitivity == 0) + iCaseSensitivity = CASESENSITIVITYDEFAULTVALUE; + + if (iCaseSensitivity == 1) + return strcmp (fileName1, fileName2); + + return STRCMPCASENOSENTIVEFUNCTION (fileName1, fileName2); +} + +#define BUFREADCOMMENT (0x400) + +/* + * Locate the Central directory of a zipfile (at the end, just before the + * global comment) + */ +local uLong +unzlocal_SearchCentralDir (FILE * fin) +{ + unsigned char *buf; + uLong uSizeFile; + uLong uBackRead; + uLong uMaxBack = 0xffff; /* maximum size of global comment */ + uLong uPosFound = 0; + + if (fseek (fin, 0, SEEK_END) != 0) + return 0; + + uSizeFile = ftell (fin); + + if (uMaxBack > uSizeFile) + uMaxBack = uSizeFile; + + buf = (unsigned char *) ALLOC (BUFREADCOMMENT + 4); + if (buf == NULL) + return 0; + + uBackRead = 4; + while (uBackRead < uMaxBack) + { + uLong uReadSize, uReadPos; + int i; + if (uBackRead + BUFREADCOMMENT > uMaxBack) + uBackRead = uMaxBack; + else + uBackRead += BUFREADCOMMENT; + uReadPos = uSizeFile - uBackRead; + + uReadSize = ((BUFREADCOMMENT + 4) < (uSizeFile - uReadPos)) ? + (BUFREADCOMMENT + 4) : (uSizeFile - uReadPos); + if (fseek (fin, uReadPos, SEEK_SET) != 0) + break; + + if (fread (buf, (uInt) uReadSize, 1, fin) != 1) + break; + + for (i = 0; i < (int) uReadSize - 3; i++) + if (((*(buf + i)) == 0x50) && ((*(buf + i + 1)) == 0x4b) && + ((*(buf + i + 2)) == 0x05) && ((*(buf + i + 3)) == 0x06)) + { + uPosFound = uReadPos + i; + break; + } + if (uPosFound != 0) + break; + } + TRYFREE (buf); + return uPosFound; +} + +/* + * Open a Zip file. path contain the full pathname (by example, on a Windows + * NT computer "c:\\test\\zlib109.zip" or on an Unix computer + * "zlib/zlib109.zip". If the zipfile cannot be opened (file don't exist or + * in not valid), the return value is NULL. Else, the return value is a + * unzFile Handle, usable with other function of this unzip package. + */ +extern unzFile ZEXPORT +unzOpen (const char *path) +{ + unz_s us; + unz_s *s; + uLong central_pos, uL; + FILE *fin; + + uLong number_disk;/* number of the current dist, used for + * spaning ZIP, unsupported, always 0 */ + uLong number_disk_with_CD; /* number the the disk with + * central dir, used for + * spaning ZIP, unsupported, + * always 0 */ + uLong number_entry_CD; /* total number of entries in the + * central dir (same than + * number_entry on nospan) */ + + int err = UNZ_OK; + + if (unz_copyright[0] != ' ') + return NULL; + + fin = fopen (path, "rb"); + if (fin == NULL) + return NULL; + + central_pos = unzlocal_SearchCentralDir (fin); + if (central_pos == 0) + err = UNZ_ERRNO; + + if (fseek (fin, central_pos, SEEK_SET) != 0) + err = UNZ_ERRNO; + + /* the signature, already checked */ + if (unzlocal_getLong (fin, &uL) != UNZ_OK) + err = UNZ_ERRNO; + + /* number of this disk */ + if (unzlocal_getShort (fin, &number_disk) != UNZ_OK) + err = UNZ_ERRNO; + + /* number of the disk with the start of the central directory */ + if (unzlocal_getShort (fin, &number_disk_with_CD) != UNZ_OK) + err = UNZ_ERRNO; + + /* total number of entries in the central dir on this disk */ + if (unzlocal_getShort (fin, &us.gi.number_entry) != UNZ_OK) + err = UNZ_ERRNO; + + /* total number of entries in the central dir */ + if (unzlocal_getShort (fin, &number_entry_CD) != UNZ_OK) + err = UNZ_ERRNO; + + if ((number_entry_CD != us.gi.number_entry) || + (number_disk_with_CD != 0) || + (number_disk != 0)) + err = UNZ_BADZIPFILE; + + /* size of the central directory */ + if (unzlocal_getLong (fin, &us.size_central_dir) != UNZ_OK) + err = UNZ_ERRNO; + + /* + * offset of start of central directory with respect to the starting disk + * number + */ + if (unzlocal_getLong (fin, &us.offset_central_dir) != UNZ_OK) + err = UNZ_ERRNO; + + /* zipfile comment length */ + if (unzlocal_getShort (fin, &us.gi.size_comment) != UNZ_OK) + err = UNZ_ERRNO; + + if ((central_pos < us.offset_central_dir + us.size_central_dir) && + (err == UNZ_OK)) + err = UNZ_BADZIPFILE; + + if (err != UNZ_OK) + { + fclose (fin); + return NULL; + } + us.file = fin; + us.byte_before_the_zipfile = central_pos - + (us.offset_central_dir + us.size_central_dir); + us.central_pos = central_pos; + us.pfile_in_zip_read = NULL; + + + s = (unz_s *) ALLOC (sizeof (unz_s)); + *s = us; + unzGoToFirstFile ((unzFile) s); + return (unzFile) s; +} + + +/* + * Close a ZipFile opened with unzipOpen. If there is files inside the .Zip + * opened with unzipOpenCurrentFile (see later), these files MUST be closed + * with unzipCloseCurrentFile before call unzipClose. return UNZ_OK if there + * is no problem. + */ +extern int ZEXPORT +unzClose (unzFile file) +{ + unz_s *s; + if (file == NULL) + return UNZ_PARAMERROR; + s = (unz_s *) file; + + if (s->pfile_in_zip_read != NULL) + unzCloseCurrentFile (file); + + fclose (s->file); + TRYFREE (s); + return UNZ_OK; +} + + +/* + * Write info about the ZipFile in the *pglobal_info structure. No + * preparation of the structure is needed return UNZ_OK if there is no + * problem. + */ +extern int ZEXPORT +unzGetGlobalInfo (unzFile file, unz_global_info * pglobal_info) +{ + unz_s *s; + if (file == NULL) + return UNZ_PARAMERROR; + s = (unz_s *) file; + *pglobal_info = s->gi; + return UNZ_OK; +} + + +/* + * Translate date/time from Dos format to tm_unz (readable more easilty) + */ +local void +unzlocal_DosDateToTmuDate (uLong ulDosDate, tm_unz * ptm) +{ + uLong uDate; + uDate = (uLong) (ulDosDate >> 16); + ptm->tm_mday = (uInt) (uDate & 0x1f); + ptm->tm_mon = (uInt) ((((uDate) & 0x1E0) / 0x20) - 1); + ptm->tm_year = (uInt) (((uDate & 0x0FE00) / 0x0200) + 1980); + + ptm->tm_hour = (uInt) ((ulDosDate & 0xF800) / 0x800); + ptm->tm_min = (uInt) ((ulDosDate & 0x7E0) / 0x20); + ptm->tm_sec = (uInt) (2 * (ulDosDate & 0x1f)); +} + +/* + * Get Info about the current file in the zipfile, with internal only info + */ +local int unzlocal_GetCurrentFileInfoInternal +OF ((unzFile file, + unz_file_info * pfile_info, + unz_file_info_internal + * pfile_info_internal, + char *szFileName, + uLong fileNameBufferSize, + void *extraField, + uLong extraFieldBufferSize, + char *szComment, + uLong commentBufferSize)); + + local int unzlocal_GetCurrentFileInfoInternal ( + unzFile file, + unz_file_info * pfile_info, + unz_file_info_internal * pfile_info_internal, + char *szFileName, + uLong fileNameBufferSize, + void *extraField, + uLong extraFieldBufferSize, + char *szComment, + uLong commentBufferSize) +{ + unz_s *s; + unz_file_info file_info; + unz_file_info_internal file_info_internal; + int err = UNZ_OK; + uLong uMagic; + long lSeek = 0; + + if (file == NULL) + return UNZ_PARAMERROR; + s = (unz_s *) file; + if (fseek (s->file, s->pos_in_central_dir + s->byte_before_the_zipfile, SEEK_SET) != 0) + err = UNZ_ERRNO; + + + /* we check the magic */ + if (err == UNZ_OK) + { + if (unzlocal_getLong (s->file, &uMagic) != UNZ_OK) + err = UNZ_ERRNO; + else if (uMagic != 0x02014b50) + err = UNZ_BADZIPFILE; + } + if (unzlocal_getShort (s->file, &file_info.version) != UNZ_OK) + err = UNZ_ERRNO; + + if (unzlocal_getShort (s->file, &file_info.version_needed) != UNZ_OK) + err = UNZ_ERRNO; + + if (unzlocal_getShort (s->file, &file_info.flag) != UNZ_OK) + err = UNZ_ERRNO; + + if (unzlocal_getShort (s->file, &file_info.compression_method) != UNZ_OK) + err = UNZ_ERRNO; + + if (unzlocal_getLong (s->file, &file_info.dosDate) != UNZ_OK) + err = UNZ_ERRNO; + + unzlocal_DosDateToTmuDate (file_info.dosDate, &file_info.tmu_date); + + if (unzlocal_getLong (s->file, &file_info.crc) != UNZ_OK) + err = UNZ_ERRNO; + + if (unzlocal_getLong (s->file, &file_info.compressed_size) != UNZ_OK) + err = UNZ_ERRNO; + + if (unzlocal_getLong (s->file, &file_info.uncompressed_size) != UNZ_OK) + err = UNZ_ERRNO; + + if (unzlocal_getShort (s->file, &file_info.size_filename) != UNZ_OK) + err = UNZ_ERRNO; + + if (unzlocal_getShort (s->file, &file_info.size_file_extra) != UNZ_OK) + err = UNZ_ERRNO; + + if (unzlocal_getShort (s->file, &file_info.size_file_comment) != UNZ_OK) + err = UNZ_ERRNO; + + if (unzlocal_getShort (s->file, &file_info.disk_num_start) != UNZ_OK) + err = UNZ_ERRNO; + + if (unzlocal_getShort (s->file, &file_info.internal_fa) != UNZ_OK) + err = UNZ_ERRNO; + + if (unzlocal_getLong (s->file, &file_info.external_fa) != UNZ_OK) + err = UNZ_ERRNO; + + if (unzlocal_getLong (s->file, &file_info_internal.offset_curfile) != UNZ_OK) + err = UNZ_ERRNO; + + lSeek += file_info.size_filename; + if ((err == UNZ_OK) && (szFileName != NULL)) + { + uLong uSizeRead; + if (file_info.size_filename < fileNameBufferSize) + { + *(szFileName + file_info.size_filename) = '\0'; + uSizeRead = file_info.size_filename; + } else + uSizeRead = fileNameBufferSize; + + if ((file_info.size_filename > 0) && (fileNameBufferSize > 0)) + if (fread (szFileName, (uInt) uSizeRead, 1, s->file) != 1) + err = UNZ_ERRNO; + lSeek -= uSizeRead; + } + if ((err == UNZ_OK) && (extraField != NULL)) + { + uLong uSizeRead; + if (file_info.size_file_extra < extraFieldBufferSize) + uSizeRead = file_info.size_file_extra; + else + uSizeRead = extraFieldBufferSize; + + if (lSeek != 0) + { + if (fseek (s->file, lSeek, SEEK_CUR) == 0) + lSeek = 0; + else + err = UNZ_ERRNO; + } + if ((file_info.size_file_extra > 0) && (extraFieldBufferSize > 0)) + if (fread (extraField, (uInt) uSizeRead, 1, s->file) != 1) + err = UNZ_ERRNO; + lSeek += file_info.size_file_extra - uSizeRead; + } else + lSeek += file_info.size_file_extra; + + + if ((err == UNZ_OK) && (szComment != NULL)) + { + uLong uSizeRead; + if (file_info.size_file_comment < commentBufferSize) + { + *(szComment + file_info.size_file_comment) = '\0'; + uSizeRead = file_info.size_file_comment; + } else + uSizeRead = commentBufferSize; + + if (lSeek != 0) + { + if (fseek (s->file, lSeek, SEEK_CUR) == 0) + lSeek = 0; + else + err = UNZ_ERRNO; + } + if ((file_info.size_file_comment > 0) && (commentBufferSize > 0)) + if (fread (szComment, (uInt) uSizeRead, 1, s->file) != 1) + err = UNZ_ERRNO; + lSeek += file_info.size_file_comment - uSizeRead; + } else + lSeek += file_info.size_file_comment; + + if ((err == UNZ_OK) && (pfile_info != NULL)) + *pfile_info = file_info; + + if ((err == UNZ_OK) && (pfile_info_internal != NULL)) + *pfile_info_internal = file_info_internal; + + return err; +} + + + +/* + * Write info about the ZipFile in the *pglobal_info structure. No + * preparation of the structure is needed return UNZ_OK if there is no + * problem. + */ +extern int ZEXPORT +unzGetCurrentFileInfo ( + unzFile file, + unz_file_info * pfile_info, + char *szFileName, + uLong fileNameBufferSize, + void *extraField, + uLong extraFieldBufferSize, + char *szComment, + uLong commentBufferSize) +{ + return unzlocal_GetCurrentFileInfoInternal (file, pfile_info, NULL, + szFileName, fileNameBufferSize, + extraField, extraFieldBufferSize, + szComment, commentBufferSize); +} + +/* + * Set the current file of the zipfile to the first file. return UNZ_OK if + * there is no problem + */ +extern int ZEXPORT +unzGoToFirstFile (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->num_file + 1 == s->gi.number_entry) + return UNZ_END_OF_LIST_OF_FILE; + + s->pos_in_central_dir += SIZECENTRALDIRITEM + s->cur_file_info.size_filename + + s->cur_file_info.size_file_extra + s->cur_file_info.size_file_comment; + s->num_file++; + err = unzlocal_GetCurrentFileInfoInternal (file, &s->cur_file_info, + &s->cur_file_info_internal, + NULL, 0, NULL, 0, NULL, 0); + s->current_file_ok = (err == UNZ_OK); + return err; +} + + +/* + * Try locate the file szFileName in the zipfile. For the iCaseSensitivity + * signification, see unzipStringFileNameCompare + * + * return value : UNZ_OK if the file is found. It becomes the current file. + * UNZ_END_OF_LIST_OF_FILE if the file is not found + */ +extern int ZEXPORT +unzLocateFile ( + unzFile file, + const char *szFileName, + int iCaseSensitivity) +{ + unz_s *s; + int err; + + + uLong num_fileSaved; + uLong pos_in_central_dirSaved; + + + if (file == NULL) + return UNZ_PARAMERROR; + + if (strlen (szFileName) >= UNZ_MAXFILENAMEINZIP) + return UNZ_PARAMERROR; + + s = (unz_s *) file; + if (!s->current_file_ok) + return UNZ_END_OF_LIST_OF_FILE; + + num_fileSaved = s->num_file; + pos_in_central_dirSaved = s->pos_in_central_dir; + + err = unzGoToFirstFile (file); + + while (err == UNZ_OK) + { + char szCurrentFileName[UNZ_MAXFILENAMEINZIP + 1]; + unzGetCurrentFileInfo (file, NULL, + szCurrentFileName, sizeof (szCurrentFileName) - 1, + NULL, 0, NULL, 0); + if (unzStringFileNameCompare (szCurrentFileName, + szFileName, iCaseSensitivity) == 0) + return UNZ_OK; + err = unzGoToNextFile (file); + } + + s->num_file = num_fileSaved; + s->pos_in_central_dir = pos_in_central_dirSaved; + return err; +} + + +/* + * Read the local header of the current zipfile Check the coherency of the + * local header and info in the end of central directory about this file + * store in *piSizeVar the size of extra info in local header (filename and + * size of extra field data) + */ +local int +unzlocal_CheckCurrentFileCoherencyHeader ( + unz_s * s, + uInt * piSizeVar, + uLong * poffset_local_extrafield, + uInt * psize_local_extrafield) +{ + uLong uMagic, uData, uFlags; + uLong size_filename; + uLong size_extra_field; + int err = UNZ_OK; + + *piSizeVar = 0; + *poffset_local_extrafield = 0; + *psize_local_extrafield = 0; + + if (fseek (s->file, s->cur_file_info_internal.offset_curfile + + s->byte_before_the_zipfile, SEEK_SET) != 0) + return UNZ_ERRNO; + + + if (err == UNZ_OK) + { + if (unzlocal_getLong (s->file, &uMagic) != UNZ_OK) + err = UNZ_ERRNO; + else if (uMagic != 0x04034b50) + err = UNZ_BADZIPFILE; + } + + if (unzlocal_getShort (s->file, &uData) != UNZ_OK) + err = UNZ_ERRNO; + /* + * else if ((err==UNZ_OK) && (uData!=s->cur_file_info.wVersion)) + * err=UNZ_BADZIPFILE; + */ + if (unzlocal_getShort (s->file, &uFlags) != UNZ_OK) + err = UNZ_ERRNO; + + if (unzlocal_getShort (s->file, &uData) != UNZ_OK) + err = UNZ_ERRNO; + else if ((err == UNZ_OK) && (uData != s->cur_file_info.compression_method)) + err = UNZ_BADZIPFILE; + + if ((err == UNZ_OK) && + s->cur_file_info.compression_method > Z_DEFLATED) + err = UNZ_BADZIPFILE; + + if (unzlocal_getLong (s->file, &uData) != UNZ_OK) /* date/time */ + err = UNZ_ERRNO; + + if (unzlocal_getLong (s->file, &uData) != UNZ_OK) /* crc */ + err = UNZ_ERRNO; + else if ((err == UNZ_OK) && (uData != s->cur_file_info.crc) && + ((uFlags & 8) == 0)) + err = UNZ_BADZIPFILE; + + if (unzlocal_getLong (s->file, &uData) != UNZ_OK) /* size compr */ + err = UNZ_ERRNO; + else if ((err == UNZ_OK) && (uData != s->cur_file_info.compressed_size) && + ((uFlags & 8) == 0)) + err = UNZ_BADZIPFILE; + + if (unzlocal_getLong (s->file, &uData) != UNZ_OK) /* size uncompr */ + err = UNZ_ERRNO; + else if ((err == UNZ_OK) && (uData != s->cur_file_info.uncompressed_size) && + ((uFlags & 8) == 0)) + err = UNZ_BADZIPFILE; + + + if (unzlocal_getShort (s->file, &size_filename) != UNZ_OK) + err = UNZ_ERRNO; + else if ((err == UNZ_OK) && (size_filename != s->cur_file_info.size_filename)) + err = UNZ_BADZIPFILE; + + *piSizeVar += (uInt) size_filename; + + if (unzlocal_getShort (s->file, &size_extra_field) != UNZ_OK) + err = UNZ_ERRNO; + *poffset_local_extrafield = s->cur_file_info_internal.offset_curfile + + SIZEZIPLOCALHEADER + size_filename; + *psize_local_extrafield = (uInt) size_extra_field; + + *piSizeVar += (uInt) size_extra_field; + + return err; +} + +/* + * Open for reading data the current file in the zipfile. If there is no + * error and the file is opened, the return value is UNZ_OK. + */ +extern int ZEXPORT +unzOpenCurrentFile (unzFile file) +{ + 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; + + if (pfile_in_zip_read_info->read_buffer == NULL) + { + TRYFREE (pfile_in_zip_read_info); + return UNZ_INTERNALERROR; + } + pfile_in_zip_read_info->stream_initialised = 0; + + if (s->cur_file_info.compression_method > 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->file = s->file; + pfile_in_zip_read_info->byte_before_the_zipfile = s->byte_before_the_zipfile; + + pfile_in_zip_read_info->stream.total_out = 0; + + switch (s->cur_file_info.compression_method) + { + case UNZ_STORED: + break; + case UNZ_SHRUNK: + break; + case UNZ_REDUCED1: + case UNZ_REDUCED2: + case UNZ_REDUCED3: + case UNZ_REDUCED4: + break; + case UNZ_IMPLODED: + break; + case UNZ_DEFLATED: + pfile_in_zip_read_info->stream.zalloc = (alloc_func) 0; + pfile_in_zip_read_info->stream.zfree = (free_func) 0; + pfile_in_zip_read_info->stream.opaque = (voidpf) 0; + + err = inflateInit2 (&pfile_in_zip_read_info->stream, -MAX_WBITS); + if (err == Z_OK) + pfile_in_zip_read_info->stream_initialised = 1; + /* + * windowBits is passed < 0 to tell that there is no zlib header. + * Note that in this case inflate *requires* an extra "dummy" byte + * after the compressed stream in order to complete decompression and + * return Z_STREAM_END. In unzip, i don't wait absolutely + * Z_STREAM_END because I known the size of both compressed and + * uncompressed data + */ + break; + default: + return UNZ_INTERNALERROR; + break; + } + pfile_in_zip_read_info->rest_read_compressed = + s->cur_file_info.compressed_size; + pfile_in_zip_read_info->rest_read_uncompressed = + s->cur_file_info.uncompressed_size; + + pfile_in_zip_read_info->pos_in_zipfile = + s->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER + + iSizeVar; + + pfile_in_zip_read_info->stream.avail_in = (uInt) 0; + s->pfile_in_zip_read = pfile_in_zip_read_info; + return UNZ_OK; +} + + +/* + * Read bytes from the current file. buf contain buffer where data must be + * copied len the size of buf. + * + * return the number of byte copied if somes bytes are copied return 0 if the + * end of file was reached return <0 with error code if there is an error + * (UNZ_ERRNO for IO error, or zLib error for uncompress error) + */ + +file_in_zip_read_info_s *pfile_in_zip_read_info = NULL; +unz_s *pUnzip = NULL; +extern int ZEXPORT +unzReadCurrentFile ( + unzFile file, + voidp buf, + unsigned len) +{ + int err = UNZ_OK; + uInt iRead = 0; + unz_s *s; + if (file == NULL) + return UNZ_PARAMERROR; + s = (unz_s *) file; + pUnzip = s; + 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 && err == UNZ_OK) + { + switch (pfile_in_zip_read_info->compression_method) + { + case UNZ_STORED: + case UNZ_DEFLATED: + if ((pfile_in_zip_read_info->stream.avail_in == 0) && + (pfile_in_zip_read_info->rest_read_compressed > 0)) + { + uInt uReadThis = UNZ_BUFSIZE; + if (pfile_in_zip_read_info->rest_read_compressed < uReadThis) + uReadThis = (uInt) pfile_in_zip_read_info->rest_read_compressed; + if (uReadThis == 0) + return UNZ_EOF; + if (fseek (pfile_in_zip_read_info->file, + pfile_in_zip_read_info->pos_in_zipfile + + pfile_in_zip_read_info->byte_before_the_zipfile, SEEK_SET) != 0) + return UNZ_ERRNO; + if (fread (pfile_in_zip_read_info->read_buffer, uReadThis, 1, + pfile_in_zip_read_info->file) != 1) + return UNZ_ERRNO; + pfile_in_zip_read_info->pos_in_zipfile += uReadThis; + + pfile_in_zip_read_info->rest_read_compressed -= uReadThis; + + pfile_in_zip_read_info->stream.next_in = + (Bytef *) pfile_in_zip_read_info->read_buffer; + pfile_in_zip_read_info->stream.avail_in = (uInt) uReadThis; + } + break; + } + switch (pfile_in_zip_read_info->compression_method) + { + case UNZ_STORED: + { + uInt uDoCopy, i; + if (pfile_in_zip_read_info->stream.avail_out < + pfile_in_zip_read_info->stream.avail_in) + uDoCopy = pfile_in_zip_read_info->stream.avail_out; + else + uDoCopy = pfile_in_zip_read_info->stream.avail_in; + + for (i = 0; i < uDoCopy; i++) + *(pfile_in_zip_read_info->stream.next_out + i) = + *(pfile_in_zip_read_info->stream.next_in + i); + + pfile_in_zip_read_info->crc32 = crc32 (pfile_in_zip_read_info->crc32, + pfile_in_zip_read_info->stream.next_out, + uDoCopy); + pfile_in_zip_read_info->rest_read_uncompressed -= uDoCopy; + pfile_in_zip_read_info->stream.avail_in -= uDoCopy; + pfile_in_zip_read_info->stream.avail_out -= uDoCopy; + pfile_in_zip_read_info->stream.next_out += uDoCopy; + pfile_in_zip_read_info->stream.next_in += uDoCopy; + pfile_in_zip_read_info->stream.total_out += uDoCopy; + iRead += uDoCopy; + break; + } + case UNZ_SHRUNK: + iRead = pfile_in_zip_read_info->rest_read_uncompressed; + unShrink (); + break; + case UNZ_REDUCED1: + case UNZ_REDUCED2: + case UNZ_REDUCED3: + case UNZ_REDUCED4: + iRead = pfile_in_zip_read_info->rest_read_uncompressed; + unReduce (); + break; + case UNZ_IMPLODED: + iRead = pfile_in_zip_read_info->rest_read_uncompressed; + err = explode (); + break; + case UNZ_DEFLATED: + { + 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; + break; + } + default: + return (UNZ_EOF); + } + } + + 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, + voidp buf, + unsigned len) +{ + unz_s *s; + file_in_zip_read_info_s *pfile_in_zip_read_info; + uInt read_now; + uLong size_to_read; + + if (file == NULL) + return UNZ_PARAMERROR; + s = (unz_s *) file; + pfile_in_zip_read_info = s->pfile_in_zip_read; + + if (pfile_in_zip_read_info == NULL) + return UNZ_PARAMERROR; + + size_to_read = (pfile_in_zip_read_info->size_local_extrafield - + pfile_in_zip_read_info->pos_local_extrafield); + + if (buf == NULL) + return (int) size_to_read; + + if (len > size_to_read) + read_now = (uInt) size_to_read; + else + read_now = (uInt) len; + + if (read_now == 0) + return 0; + + if (fseek (pfile_in_zip_read_info->file, + pfile_in_zip_read_info->offset_local_extrafield + + pfile_in_zip_read_info->pos_local_extrafield, SEEK_SET) != 0) + return UNZ_ERRNO; + + if (fread (buf, (uInt) size_to_read, 1, pfile_in_zip_read_info->file) != 1) + return UNZ_ERRNO; + + return (int) read_now; +} + +/* + * Close the file in zip opened with unzipOpenCurrentFile Return UNZ_CRCERROR + * if all the file was read but the CRC is not good + */ +extern int ZEXPORT +unzCloseCurrentFile (unzFile file) +{ + int err = UNZ_OK; + + unz_s *s; + file_in_zip_read_info_s *pfile_in_zip_read_info; + if (file == NULL) + return UNZ_PARAMERROR; + s = (unz_s *) file; + pfile_in_zip_read_info = s->pfile_in_zip_read; + + if (pfile_in_zip_read_info == NULL) + return UNZ_PARAMERROR; + + + if (pfile_in_zip_read_info->rest_read_uncompressed == 0) + { + if (pfile_in_zip_read_info->crc32 != pfile_in_zip_read_info->crc32_wait) + err = UNZ_CRCERROR; + } + TRYFREE (pfile_in_zip_read_info->read_buffer); + pfile_in_zip_read_info->read_buffer = NULL; + if (pfile_in_zip_read_info->stream_initialised) + inflateEnd (&pfile_in_zip_read_info->stream); + + pfile_in_zip_read_info->stream_initialised = 0; + TRYFREE (pfile_in_zip_read_info); + + s->pfile_in_zip_read = NULL; + + return err; +} + + +/* + * Get the global comment string of the ZipFile, in the szComment buffer. + * uSizeBuf is the size of the szComment buffer. return the number of byte + * copied or an error code <0 + */ +extern int ZEXPORT +unzGetGlobalComment ( + unzFile file, + char *szComment, + uLong uSizeBuf) +{ + unz_s *s; + uLong uReadThis; + if (file == NULL) + return UNZ_PARAMERROR; + s = (unz_s *) file; + + uReadThis = uSizeBuf; + if (uReadThis > s->gi.size_comment) + uReadThis = s->gi.size_comment; + + if (fseek (s->file, s->central_pos + 22, SEEK_SET) != 0) + return UNZ_ERRNO; + + if (uReadThis > 0) + { + *szComment = '\0'; + if (fread (szComment, (uInt) uReadThis, 1, s->file) != 1) + return UNZ_ERRNO; + } + if ((szComment != NULL) && (uSizeBuf > s->gi.size_comment)) + *(szComment + s->gi.size_comment) = '\0'; + return (int) uReadThis; +} |