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metadata/mp4.c check for read errors skip buffer appropriately 

WIP

Change-Id: I770f0d911f7d9826e89d886892ff3913661a8151
This commit is contained in:
William Wilgus 2021-08-10 16:47:52 -04:00 committed by William Wilgus
parent 77a98ada12
commit c9e9558044
1 changed files with 61 additions and 47 deletions
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108
lib/rbcodec/metadata/mp4.c
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@ -85,31 +85,38 @@
static unsigned long read_mp4_tag(int fd, unsigned int size_left, char* buffer,
unsigned int buffer_left)
{
unsigned int bytes_read = 0;
if (buffer_left == 0)
{
lseek(fd, size_left, SEEK_CUR); /* Skip everything */
}
else
unsigned long bytes_read = 0;
ssize_t rd_ret = 0;
ssize_t bytes_req;
#define MP4_TAG_HEADER_SIZE 16
if (size_left >= MP4_TAG_HEADER_SIZE)
{
/* Skip the data tag header - maybe we should parse it properly? */
lseek(fd, 16, SEEK_CUR);
size_left -= 16;
lseek(fd, MP4_TAG_HEADER_SIZE, SEEK_CUR);
size_left -= MP4_TAG_HEADER_SIZE;
if (size_left > buffer_left)
{
read(fd, buffer, buffer_left);
lseek(fd, size_left - buffer_left, SEEK_CUR);
bytes_read = buffer_left;
}
bytes_req = buffer_left;
else
bytes_req = size_left;
rd_ret = read(fd, buffer, bytes_req);
if (rd_ret == bytes_req)
bytes_read = bytes_req;
else
{
read(fd, buffer, size_left);
bytes_read = size_left;
/* read less than expected or an error from read() */
logf("Error %d, read_mp4_tag", rd_ret);
if (rd_ret < 0)
rd_ret = 0; /* Skip everything */
}
}
if (size_left > (unsigned int) rd_ret)
lseek(fd, size_left - rd_ret, SEEK_CUR);
return bytes_read;
}
@ -437,10 +444,11 @@ static bool read_mp4_tags(int fd, struct mp3entry* id3,
case MP4_gnre:
{
unsigned short genre;
read_mp4_tag(fd, size, (char*) &genre, sizeof(genre));
id3->genre_string = id3_get_num_genre(betoh16(genre) - 1);
unsigned short genre = USHRT_MAX; /*invalid genre*/
unsigned long rd_ret;
rd_ret = read_mp4_tag(fd, size, (char*) &genre, sizeof(genre));
if (rd_ret == sizeof(genre))
id3->genre_string = id3_get_num_genre(betoh16(genre) - 1);
}
break;
@ -452,18 +460,18 @@ static bool read_mp4_tags(int fd, struct mp3entry* id3,
case MP4_disk:
{
unsigned short n[2];
read_mp4_tag(fd, size, (char*) &n, sizeof(n));
id3->discnum = betoh16(n[1]);
id3->discnum = 0;
if (read_mp4_tag(fd, size, (char*) &n, sizeof(n)) == sizeof(n))
id3->discnum = betoh16(n[1]);
}
break;
case MP4_trkn:
{
unsigned short n[2];
read_mp4_tag(fd, size, (char*) &n, sizeof(n));
id3->tracknum = betoh16(n[1]);
id3->tracknum = 0;
if (read_mp4_tag(fd, size, (char*) &n, sizeof(n)) == sizeof(n))
id3->tracknum = betoh16(n[1]);
}
break;
@ -471,23 +479,26 @@ static bool read_mp4_tags(int fd, struct mp3entry* id3,
case MP4_covr:
{
int pos = lseek(fd, 0, SEEK_CUR) + 16;
read_mp4_tag(fd, size, buffer, 8);
id3->albumart.type = AA_TYPE_UNKNOWN;
if (memcmp(buffer, "\xff\xd8\xff\xe0", 4) == 0)
{
id3->albumart.type = AA_TYPE_JPG;
}
else if (memcmp(buffer, "\x89\x50\x4e\x47\x0d\x0a\x1a\x0a", 8) == 0)
{
id3->albumart.type = AA_TYPE_PNG;
}
if (id3->albumart.type != AA_TYPE_UNKNOWN)
if (read_mp4_tag(fd, size, buffer, 8) >= 4)
{
id3->albumart.pos = pos;
id3->albumart.size = size - 16;
id3->has_embedded_albumart = true;
if (memcmp(buffer, "\xff\xd8\xff\xe0", 4) == 0)
{
id3->albumart.type = AA_TYPE_JPG;
}
else if (memcmp(buffer, "\x89\x50\x4e\x47\x0d\x0a\x1a\x0a", 8) == 0)
{
id3->albumart.type = AA_TYPE_PNG;
}
if (id3->albumart.type != AA_TYPE_UNKNOWN)
{
id3->albumart.pos = pos;
id3->albumart.size = size - 16;
id3->has_embedded_albumart = true;
}
}
}
break;
@ -497,7 +508,7 @@ static bool read_mp4_tags(int fd, struct mp3entry* id3,
{
char tag_name[TAG_NAME_LENGTH];
uint32_t sub_size;
ssize_t rd_ret;
/* "mean" atom */
read_uint32be(fd, &sub_size);
size -= sub_size;
@ -510,16 +521,19 @@ static bool read_mp4_tags(int fd, struct mp3entry* id3,
if (sub_size > sizeof(tag_name) - 1)
{
read(fd, tag_name, sizeof(tag_name) - 1);
rd_ret = read(fd, tag_name, sizeof(tag_name) - 1);
lseek(fd, sub_size - (sizeof(tag_name) - 1), SEEK_CUR);
tag_name[sizeof(tag_name) - 1] = 0;
sub_size = sizeof(tag_name) - 1;
}
else
{
read(fd, tag_name, sub_size);
tag_name[sub_size] = 0;
rd_ret = read(fd, tag_name, sub_size);
}
if (rd_ret != (ssize_t)sub_size)
rd_ret = 0;
tag_name[rd_ret] = 0;
if ((strcasecmp(tag_name, "composer") == 0) && !cwrt)
{
read_mp4_tag_string(fd, size, &buffer, &buffer_left,