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tag/{Aiff,Riff}: allow fstat() to fail 

Omit the file size check if we don't know the size.
This commit is contained in:
Max Kellermann 2016-02-19 18:01:16 +01:00
parent 0acc88cde5
commit a5e8269c72
2 changed files with 25 additions and 12 deletions
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19
src/tag/Aiff.cxx
View File

@ -42,16 +42,22 @@ struct aiff_chunk_header {
uint32_t size;
};
gcc_pure
static off_t
GetFileSize(FILE *file)
{
struct stat st;
return fstat(fileno(file), &st) == 0
? st.st_size
: -1;
}
size_t
aiff_seek_id3(FILE *file)
{
/* determine the file size */
struct stat st;
if (fstat(fileno(file), &st) < 0) {
LogErrno(aiff_domain, "Failed to stat file descriptor");
return 0;
}
const off_t file_size = GetFileSize(file);
/* seek to the beginning and read the AIFF header */
@ -64,7 +70,8 @@ aiff_seek_id3(FILE *file)
size_t size = fread(&header, sizeof(header), 1, file);
if (size != 1 ||
memcmp(header.id, "FORM", 4) != 0 ||
FromBE32(header.size) > (uint32_t)st.st_size ||
(file_size >= 0 &&
FromBE32(header.size) > (uint32_t)file_size) ||
(memcmp(header.format, "AIFF", 4) != 0 &&
memcmp(header.format, "AIFC", 4) != 0))
/* not a AIFF file */

18
src/tag/Riff.cxx
View File

@ -42,16 +42,22 @@ struct riff_chunk_header {
uint32_t size;
};
gcc_pure
static off_t
GetFileSize(FILE *file)
{
struct stat st;
return fstat(fileno(file), &st) == 0
? st.st_size
: -1;
}
size_t
riff_seek_id3(FILE *file)
{
/* determine the file size */
struct stat st;
if (fstat(fileno(file), &st) < 0) {
LogErrno(riff_domain, "Failed to stat file descriptor");
return 0;
}
const off_t file_size = GetFileSize(file);
/* seek to the beginning and read the RIFF header */
@ -64,7 +70,7 @@ riff_seek_id3(FILE *file)
size_t size = fread(&header, sizeof(header), 1, file);
if (size != 1 ||
memcmp(header.id, "RIFF", 4) != 0 ||
FromLE32(header.size) > (uint32_t)st.st_size)
(file_size >= 0 && FromLE32(header.size) > (uint32_t)file_size))
/* not a RIFF file */
return 0;