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tags manipulation

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This commit is contained in:
Frédéric Mangano 2013-01-01 16:10:46 +01:00
parent ee702d71e2
commit 7f3d1b1367
1 changed files with 55 additions and 8 deletions
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63
opustags.c
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@ -32,7 +32,7 @@ int parse_tags(char *data, long len, opus_tags *tags){
tags->lengths = calloc(tags->count, sizeof(uint32_t));
if(tags->lengths == NULL)
return -1;
tags->comment = calloc(tags->count, sizeof(const char*));
tags->comment = calloc(tags->count, sizeof(char*));
if(tags->comment == NULL){
free(tags->lengths);
return -1;
@ -52,6 +52,54 @@ int parse_tags(char *data, long len, opus_tags *tags){
return 0;
}
int match_field(const char *comment, uint32_t len, const char *field){
size_t field_len = strlen(field);
if(len <= field_len)
return 0;
if(comment[field_len] != '=')
return 0;
if(strncmp(comment, field, field_len) != 0)
return 0;
return 1;
}
void delete_tags(opus_tags *tags, const char *field){
uint32_t i;
for(i=0; i<tags->count; i++){
if(match_field(tags->comment[i], tags->lengths[i], field)){
tags->count--;
tags->lengths[i] = tags->lengths[tags->count];
tags->comment[i] = tags->comment[tags->count];
// No need to resize the arrays.
}
}
}
int add_tags(opus_tags *tags, const char **tags_to_add, uint32_t count){
uint32_t *lengths = realloc(tags->lengths, (tags->count + count) * sizeof(uint32_t));
const char **comment = realloc(tags->comment, (tags->count + count) * sizeof(char*));
if(lengths == NULL || comment == NULL)
return -1;
tags->lengths = lengths;
tags->comment = comment;
uint32_t i;
for(i=0; i<count; i++){
tags->lengths[tags->count + i] = strlen(tags_to_add[i]);
tags->comment[tags->count + i] = tags_to_add[i];
}
tags->count += count;
return 0;
}
void print_tags(opus_tags *tags){
int i;
for(i=0; i<tags->count; i++){
fwrite(tags->comment[i], 1, tags->lengths[i], stdout);
puts("");
}
}
void free_tags(opus_tags *tags){
if(tags->count > 0){
free(tags->lengths);
@ -112,13 +160,12 @@ int main(int argc, char **argv){
if(packet_count == 2){ // Comment header
if(parse_tags((char*) op.packet, op.bytes, &tags) == -1)
error = "opustags: invalid comment header";
fwrite(tags.vendor_string, 1, tags.vendor_length, stdout);
puts("");
int i;
for(i=0; i<tags.count; i++){
fwrite(tags.comment[i], 1, tags.lengths[i], stdout);
puts("");
}
// DEBUG
delete_tags(&tags, "ARTIST");
const char *tag = "ARTIST=Someone";
add_tags(&tags, &tag, 1);
print_tags(&tags);
// END DEBUG
free_tags(&tags);
break;
}