return len + ID3v2_HEADER_SIZE;
}
+/**
+ * Write a priv frame with owner and data. 'key' is the owner prepended with
+ * ID3v2_PRIV_METADATA_PREFIX. 'data' is provided as a string. Any \xXX
+ * (where 'X' is a valid hex digit) will be unescaped to the byte value.
+ */
+static int id3v2_put_priv(ID3v2EncContext *id3, AVIOContext *avioc, const char *key, const char *data)
+{
+ int len;
+ uint8_t *pb;
+ AVIOContext *dyn_buf;
+
+ if (!av_strstart(key, ID3v2_PRIV_METADATA_PREFIX, &key)) {
+ return 0;
+ }
+
+ if (avio_open_dyn_buf(&dyn_buf) < 0)
+ return AVERROR(ENOMEM);
+
+ // owner + null byte.
+ avio_write(dyn_buf, key, strlen(key) + 1);
+
+ while (*data) {
+ if (av_strstart(data, "\\x", &data)) {
+ if (data[0] && data[1] && av_isxdigit(data[0]) && av_isxdigit(data[1])) {
+ char digits[] = {data[0], data[1], 0};
+ avio_w8(dyn_buf, strtol(digits, NULL, 16));
+ data += 2;
+ } else {
+ ffio_free_dyn_buf(&dyn_buf);
+ av_log(avioc, AV_LOG_ERROR, "Invalid escape '\\x%.2s' in metadata tag '"
+ ID3v2_PRIV_METADATA_PREFIX "%s'.\n", data, key);
+ return AVERROR(EINVAL);
+ }
+ } else {
+ avio_write(dyn_buf, data++, 1);
+ }
+ }
+
+ len = avio_close_dyn_buf(dyn_buf, &pb);
+
+ avio_wb32(avioc, MKBETAG('P', 'R', 'I', 'V'));
+ if (id3->version == 3)
+ avio_wb32(avioc, len);
+ else
+ id3v2_put_size(avioc, len);
+ avio_wb16(avioc, 0);
+ avio_write(avioc, pb, len);
+
+ av_free(pb);
+
+ return len + ID3v2_HEADER_SIZE;
+}
+
static int id3v2_check_write_tag(ID3v2EncContext *id3, AVIOContext *pb, AVDictionaryEntry *t,
const char table[][4], enum ID3v2Encoding enc)
{
continue;
}
+ if ((ret = id3v2_put_priv(id3, pb, t->key, t->value)) > 0) {
+ id3->len += ret;
+ continue;
+ } else if (ret < 0) {
+ return ret;
+ }
+
/* unknown tag, write as TXXX frame */
if ((ret = id3v2_put_ttag(id3, pb, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0)
return ret;