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Added ability to seek backward further for some applications.

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This commit is contained in:
Nathan Moinvaziri 2018-12-01 20:42:36 -08:00
parent 1ff40343b5
commit c78c782f63
1 changed files with 6 additions and 4 deletions
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10
mz_zip.c
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@ -64,6 +64,10 @@
#define MZ_ZIP_SIZE_CD_ITEM (46)
#define MZ_ZIP_SIZE_CD_LOCATOR64 (20)
#ifndef MZ_ZIP_EOCD_MAX_BACK
#define MZ_ZIP_EOCD_MAX_BACK (1 << 20)
#endif
/***************************************************************************/
typedef struct mz_zip_s
@ -115,7 +119,7 @@ typedef struct mz_zip_s
static int32_t mz_zip_search_eocd(void *stream, int64_t *central_pos)
{
int64_t file_size = 0;
int64_t max_back = 0;
int64_t max_back = MZ_ZIP_EOCD_MAX_BACK;
uint8_t find[4] = MZ_ZIP_MAGIC_ENDHEADERU8;
int32_t err = MZ_OK;
@ -125,9 +129,7 @@ static int32_t mz_zip_search_eocd(void *stream, int64_t *central_pos)
file_size = mz_stream_tell(stream);
/* Maximum seek is size of global comment + extra */
max_back = UINT16_MAX + 128;
if (max_back > file_size)
if (max_back <= 0 || max_back > file_size)
max_back = file_size;
return mz_stream_find_reverse(stream, (const void *)find, sizeof(find), max_back, central_pos);