diff options
Diffstat (limited to 'core/io')
| -rw-r--r-- | core/io/unzip.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/core/io/unzip.c b/core/io/unzip.c index 78672677f9..7aa0a86d13 100644 --- a/core/io/unzip.c +++ b/core/io/unzip.c @@ -1031,10 +1031,19 @@ local int unz64local_GetCurrentFileInfoInternal (unzFile file, if (lSeek!=0) { - if (ZSEEK64(s->z_filefunc, s->filestream,lSeek,ZLIB_FILEFUNC_SEEK_CUR)==0) - lSeek=0; - else - err=UNZ_ERRNO; + if (lSeek<0) { + // WORKAROUND for backwards seeking + z_off_t pos = ZTELL64(s->z_filefunc, s->filestream); + if (ZSEEK64(s->z_filefunc, s->filestream,pos+lSeek,ZLIB_FILEFUNC_SEEK_SET)==0) + lSeek=0; + else + err=UNZ_ERRNO; + } else { + if (ZSEEK64(s->z_filefunc, s->filestream,lSeek,ZLIB_FILEFUNC_SEEK_CUR)==0) + lSeek=0; + else + err=UNZ_ERRNO; + } } while(acc < file_info.size_file_extra) |