/*
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 unzOpenCurrentFile (unzFile file)
{
int err=UNZ_OK;
int Store;
uInt iSizeVar;
unz_s* s;
file_in_zip_read_info_s* pfile_in_zip_read_info;
uLong offset_local_extrafield; /* offset of the static extra field */
uInt size_local_extrafield; /* size of the static 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));
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->stream_initialised=0;
if ((s->cur_file_info.compression_method!=0) &&
(s->cur_file_info.compression_method!=ZF_DEFLATED))
err=UNZ_BADZIPFILE;
Store = s->cur_file_info.compression_method==0;
pfile_in_zip_read_info->crc32_wait=s->cur_file_info.crc;
pfile_in_zip_read_info->crc32=0;
pfile_in_zip_read_info->compression_method =
s->cur_file_info.compression_method;
pfile_in_zip_read_info->file=s->file;
pfile_in_zip_read_info->byte_before_the_zipfile=s->byte_before_the_zipfile;
pfile_in_zip_read_info->stream.total_out = 0;
if (!Store)
{
err=inflateInit(&pfile_in_zip_read_info->stream, Z_SYNC_FLUSH, 1);
if (err == Z_OK)
pfile_in_zip_read_info->stream_initialised=1;
/* windowBits is passed < 0 to tell that there is no zlib header.
* Note that in this case inflate *requires* an extra "dummy" byte
* after the compressed stream in order to complete decompression and
* return Z_STREAM_END.
* In unzip, i don't wait absolutely Z_STREAM_END because I known the
* size of both compressed and uncompressed data
*/
}
pfile_in_zip_read_info->rest_read_compressed =
s->cur_file_info.compressed_size ;
pfile_in_zip_read_info->rest_read_uncompressed =
s->cur_file_info.uncompressed_size ;
pfile_in_zip_read_info->pos_in_zipfile =
s->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER +
iSizeVar;
pfile_in_zip_read_info->stream.avail_in = (uInt)0;
s->pfile_in_zip_read = pfile_in_zip_read_info;
return UNZ_OK;
}
/*
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.
*/
int unzOpenCurrentFile (unzFile file) {
int err=UNZ_OK;
int Store;
uInt iSizeVar;
unz_s* s;
file_in_zip_read_info_s* pfile_in_zip_read_info;
uLong offset_local_extrafield; /* offset of the local extra field */
uInt size_local_extrafield; /* size of the local extra field */
if (file==NULL)
return UNZ_PARAMERROR;
s=(unz_s*)file;
if (!s->current_file_ok)
return UNZ_PARAMERROR;
if (s->pfile_in_zip_read != NULL)
unzCloseCurrentFile(file);
if (unzlocal_CheckCurrentFileCoherencyHeader(s,&iSizeVar,
&offset_local_extrafield,&size_local_extrafield)!=UNZ_OK)
return UNZ_BADZIPFILE;
pfile_in_zip_read_info = (file_in_zip_read_info_s*) malloc(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*)malloc(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)
{
free(pfile_in_zip_read_info);
return UNZ_INTERNALERROR;
}
pfile_in_zip_read_info->stream_initialized=0;
if ((s->cur_file_info.compression_method!=0) &&
(s->cur_file_info.compression_method!=Z_DEFLATED))
err=UNZ_BADZIPFILE;
Store = s->cur_file_info.compression_method==0;
pfile_in_zip_read_info->crc32_wait=s->cur_file_info.crc;
pfile_in_zip_read_info->crc32_data=0;
pfile_in_zip_read_info->compression_method = s->cur_file_info.compression_method;
pfile_in_zip_read_info->_stream=s->_stream;
pfile_in_zip_read_info->byte_before_the_zipfile=s->byte_before_the_zipfile;
pfile_in_zip_read_info->stream.total_out = 0;
if (!Store) {
#ifdef USE_ZLIB
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_initialized = 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
*/
#else
err=UNZ_BADZIPFILE;
#endif
}
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 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.
*/
int ZEXPORT unzOpenCurrentFile3 (
unzFile file,
int* method,
int* level,
int raw,
const char* password)
{
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 */
# 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 = (voidpf)0;
pfile_in_zip_read_info->stream.next_in = (Bytef*)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
{
TRYFREE(pfile_in_zip_read_info);
return err;
}
/* windowBits is passed < 0 to tell that there is no zlib header.
* Note that in this case inflate *requires* an extra "dummy" byte
* after the compressed stream in order to complete decompression and
* return Z_STREAM_END.
* In unzip, i don't wait absolutely Z_STREAM_END because I known the
* size of both compressed and uncompressed data
*/
}
pfile_in_zip_read_info->rest_read_compressed =
s->cur_file_info.compressed_size ;
pfile_in_zip_read_info->rest_read_uncompressed =
s->cur_file_info.uncompressed_size ;
pfile_in_zip_read_info->pos_in_zipfile =
s->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER +
iSizeVar;
pfile_in_zip_read_info->stream.avail_in = (uInt)0;
s->pfile_in_zip_read = pfile_in_zip_read_info;
# 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;
}
