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avformat:matroskadec: use a define to mark the EBML length is unknown 

Unifying the way the EBML unknown length is signaled, rather than using two
incompatible values. UINT64_MAX cannot be read as a valid EBML length with the
current code.

Co-authored-by: Steve Lhomme <robux4@ycbcr.xyz>
Co-authored-by: Dale Curtis <dalecurtis@chromium.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Steve Lhomme 2019-02-23 11:14:33 +01:00 committed by Michael Niedermayer
parent 96d79ff5b5
commit a2c7702ccf
1 changed files with 7 additions and 5 deletions
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12
libavformat/matroskadec.c
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@ -68,6 +68,8 @@
#include "qtpalette.h"
#define EBML_UNKNOWN_LENGTH UINT64_MAX /* EBML unknown length, in uint64_t */
typedef enum {
EBML_NONE,
EBML_UINT,
@ -869,7 +871,7 @@ static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
{
int res = ebml_read_num(matroska, pb, 8, number);
if (res > 0 && *number + 1 == 1ULL << (7 * res))
*number = 0xffffffffffffffULL;
*number = EBML_UNKNOWN_LENGTH;
return res;
}
@ -1049,7 +1051,7 @@ static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
break;
if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
matroska->num_levels > 0 &&
matroska->levels[matroska->num_levels - 1].length == 0xffffffffffffff)
matroska->levels[matroska->num_levels - 1].length == EBML_UNKNOWN_LENGTH)
return 0; // we reached the end of an unknown size cluster
if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
av_log(matroska->ctx, AV_LOG_DEBUG, "Unknown entry 0x%"PRIX32"\n", id);
@ -1201,7 +1203,7 @@ static int ebml_parse_elem(MatroskaDemuxContext *matroska,
MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
AVIOContext *pb = matroska->ctx->pb;
int64_t pos = avio_tell(pb);
if (level->length != (uint64_t) -1 &&
if (level->length != EBML_UNKNOWN_LENGTH &&
(pos + length) > (level->start + level->length)) {
av_log(matroska->ctx, AV_LOG_ERROR,
"Invalid length 0x%"PRIx64" > 0x%"PRIx64" in parent\n",
@ -1610,7 +1612,7 @@ static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
ret = AVERROR_INVALIDDATA;
} else {
level.start = 0;
level.length = (uint64_t) -1;
level.length = EBML_UNKNOWN_LENGTH;
matroska->levels[matroska->num_levels] = level;
matroska->num_levels++;
matroska->current_id = 0;
@ -1620,7 +1622,7 @@ static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
/* remove dummy level */
while (matroska->num_levels) {
uint64_t length = matroska->levels[--matroska->num_levels].length;
if (length == (uint64_t) -1)
if (length == EBML_UNKNOWN_LENGTH)
break;
}
}