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make WavPack library check the extent of the block that it is parsing so that it cannot run into the next block; also enhance the metadata code to handle the case of files with non-audio blocks at the beginning (which can happen if the source WAV file has lots of RIFF data)

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28736 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dave Bryant 2010-12-05 19:25:32 +00:00
parent 271441eb9d
commit 516693fcc9
4 changed files with 81 additions and 49 deletions
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9
apps/codecs/libwavpack/metadata.c
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@ -19,15 +19,16 @@ int read_metadata_buff (WavpackContext *wpc, WavpackMetadata *wpmd)
uint32_t bytes_to_read;
uchar tchar;
if (!wpc->infile (&wpmd->id, 1) || !wpc->infile (&tchar, 1))
if (wpc->stream.block_bytes_left < 2 || !wpc->infile (&wpmd->id, 1) || !wpc->infile (&tchar, 1))
return FALSE;
wpmd->byte_length = tchar << 1;
wpc->stream.block_bytes_left -= 2;
if (wpmd->id & ID_LARGE) {
wpmd->id &= ~ID_LARGE;
if (!wpc->infile (&tchar, 1))
if (wpc->stream.block_bytes_left < 2 || !wpc->infile (&tchar, 1))
return FALSE;
wpmd->byte_length += (int32_t) tchar << 9;
@ -36,8 +37,12 @@ int read_metadata_buff (WavpackContext *wpc, WavpackMetadata *wpmd)
return FALSE;
wpmd->byte_length += (int32_t) tchar << 17;
wpc->stream.block_bytes_left -= 2;
}
if ((wpc->stream.block_bytes_left -= wpmd->byte_length) < 0)
return FALSE;
if (wpmd->id & ID_ODD_SIZE) {
wpmd->id &= ~ID_ODD_SIZE;
wpmd->byte_length--;