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Code Issues Releases Activity

id3v2: read TXXX frames with two calls to decode_str() instead of one.

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Read the key in the first, value in the second.

This allows to avoid pointless strdups and simplify decode_str() by
dropping two of its parameters.
This commit is contained in:
Anton Khirnov 2011-10-02 09:06:34 +02:00
parent 1e18d32d01
commit d2961e4ebf
1 changed files with 28 additions and 32 deletions
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60
libavformat/id3v2.c
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@ -73,23 +73,20 @@ static void free_geobtag(ID3v2ExtraMetaGEOB *geob)
/**
* Decode characters to UTF-8 according to encoding type. The decoded buffer is
* always null terminated.
* always null terminated. Stop reading when either *maxread bytes are read from
* pb or U+0000 character is found.
*
* @param dst Pointer where the address of the buffer with the decoded bytes is
* stored. Buffer must be freed by caller.
* @param dstlen Pointer to an int where the length of the decoded string
* is stored (in bytes, incl. null termination)
* @param maxread Pointer to maximum number of characters to read from the
* AVIOContext. After execution the value is decremented by the number of bytes
* actually read.
* @seeknull If true, decoding stops after the first U+0000 character found, if
* there is any before maxread is reached
* @returns 0 if no error occured, dst is uninitialized on error
*/
static int decode_str(AVFormatContext *s, AVIOContext *pb, int encoding,
uint8_t **dst, int *dstlen, int *maxread, const int seeknull)
uint8_t **dst, int *maxread)
{
int len, ret;
int ret;
uint8_t tmp;
uint32_t ch = 1;
int left = *maxread;
@ -104,7 +101,7 @@ static int decode_str(AVFormatContext *s, AVIOContext *pb, int encoding,
switch (encoding) {
case ID3v2_ENCODING_ISO8859:
while (left && (!seeknull || ch)) {
while (left && ch) {
ch = avio_r8(pb);
PUT_UTF8(ch, tmp, avio_w8(dynbuf, tmp);)
left--;
@ -133,7 +130,7 @@ static int decode_str(AVFormatContext *s, AVIOContext *pb, int encoding,
// fall-through
case ID3v2_ENCODING_UTF16BE:
while ((left > 1) && (!seeknull || ch)) {
while ((left > 1) && ch) {
GET_UTF16(ch, ((left -= 2) >= 0 ? get(pb) : 0), break;)
PUT_UTF8(ch, tmp, avio_w8(dynbuf, tmp);)
}
@ -142,7 +139,7 @@ static int decode_str(AVFormatContext *s, AVIOContext *pb, int encoding,
break;
case ID3v2_ENCODING_UTF8:
while (left && (!seeknull || ch)) {
while (left && ch) {
ch = avio_r8(pb);
avio_w8(dynbuf, ch);
left--;
@ -155,10 +152,7 @@ static int decode_str(AVFormatContext *s, AVIOContext *pb, int encoding,
if (ch)
avio_w8(dynbuf, 0);
len = avio_close_dyn_buf(dynbuf, (uint8_t **)dst);
if (dstlen)
*dstlen = len;
avio_close_dyn_buf(dynbuf, (uint8_t **)dst);
*maxread = left;
return 0;
@ -170,38 +164,40 @@ static int decode_str(AVFormatContext *s, AVIOContext *pb, int encoding,
static void read_ttag(AVFormatContext *s, AVIOContext *pb, int taglen, const char *key)
{
uint8_t *dst;
const char *val = NULL;
int len, dstlen;
int encoding, dict_flags = AV_DICT_DONT_OVERWRITE;
unsigned genre;
if (taglen < 1)
return;
encoding = avio_r8(pb);
taglen--; /* account for encoding type byte */
if (decode_str(s, pb, avio_r8(pb), &dst, &dstlen, &taglen, 0) < 0) {
if (decode_str(s, pb, encoding, &dst, &taglen) < 0) {
av_log(s, AV_LOG_ERROR, "Error reading frame %s, skipped\n", key);
return;
}
if (!(strcmp(key, "TCON") && strcmp(key, "TCO"))
&& (sscanf(dst, "(%d)", &genre) == 1 || sscanf(dst, "%d", &genre) == 1)
&& genre <= ID3v1_GENRE_MAX)
val = ff_id3v1_genre_str[genre];
else if (!(strcmp(key, "TXXX") && strcmp(key, "TXX"))) {
/* dst now contains two 0-terminated strings */
dst[dstlen] = 0;
len = strlen(dst);
&& genre <= ID3v1_GENRE_MAX) {
av_freep(&dst);
dst = ff_id3v1_genre_str[genre];
} else if (!(strcmp(key, "TXXX") && strcmp(key, "TXX"))) {
/* dst now contains the key, need to get value */
key = dst;
val = dst + FFMIN(len + 1, dstlen);
if (decode_str(s, pb, encoding, &dst, &taglen) < 0) {
av_log(s, AV_LOG_ERROR, "Error reading frame %s, skipped\n", key);
av_freep(&key);
return;
}
dict_flags |= AV_DICT_DONT_STRDUP_VAL | AV_DICT_DONT_STRDUP_KEY;
}
else if (*dst)
val = dst;
dict_flags |= AV_DICT_DONT_STRDUP_VAL;
if (val)
av_dict_set(&s->metadata, key, val, AV_DICT_DONT_OVERWRITE);
av_free(dst);
if (dst)
av_dict_set(&s->metadata, key, dst, dict_flags);
}
/**
@ -234,17 +230,17 @@ static void read_geobtag(AVFormatContext *s, AVIOContext *pb, int taglen, char *
taglen--;
/* read MIME type (always ISO-8859) */
if (decode_str(s, pb, ID3v2_ENCODING_ISO8859, &geob_data->mime_type, NULL, &taglen, 1) < 0
if (decode_str(s, pb, ID3v2_ENCODING_ISO8859, &geob_data->mime_type, &taglen) < 0
|| taglen <= 0)
goto fail;
/* read file name */
if (decode_str(s, pb, encoding, &geob_data->file_name, NULL, &taglen, 1) < 0
if (decode_str(s, pb, encoding, &geob_data->file_name, &taglen) < 0
|| taglen <= 0)
goto fail;
/* read content description */
if (decode_str(s, pb, encoding, &geob_data->description, NULL, &taglen, 1) < 0
if (decode_str(s, pb, encoding, &geob_data->description, &taglen) < 0
|| taglen < 0)
goto fail;