ID3v2_frame* parse_frame(char* bytes, int offset, int version)
{
ID3v2_frame* frame = new_frame();
// Parse frame header
memcpy(frame->frame_id, bytes + offset, ID3_FRAME_ID);
// Check if we are into padding
if(memcmp(frame->frame_id, "\0\0\0\0", 4) == 0)
{
return NULL;
}
frame->size = btoi(bytes, 4, offset += ID3_FRAME_ID);
if(version == ID3v24)
{
frame->size = syncint_decode(frame->size);
}
memcpy(frame->flags, bytes + (offset += ID3_FRAME_SIZE), 2);
// Load frame data
frame->data = (char*) malloc(frame->size * sizeof(char*));
memcpy(frame->data, bytes + (offset += ID3_FRAME_FLAGS), frame->size);
return frame;
}
ID3v2_header* get_tag_header(const char* file_name)
{
char buffer[ID3_HEADER];
FILE* file = fopen(file_name, "rb");
if(file == NULL)
{
perror("Error opening file");
return NULL;
}
fread(buffer, ID3_HEADER, 1, file);
fclose(file);
ID3v2_header* tag_header = new_header();
if( ! _has_id3v2tag(buffer))
{
if (tag_header != NULL)
free (tag_header);
return NULL;
}
int position = 0;
memcpy(tag_header->tag, buffer, ID3_HEADER_TAG);
tag_header->major_version = buffer[position += ID3_HEADER_TAG];
tag_header->minor_version = buffer[position += ID3_HEADER_VERSION];
tag_header->flags = buffer[position += ID3_HEADER_REVISION];
tag_header->tag_size = syncint_decode(btoi(buffer, ID3_HEADER_SIZE, position += ID3_HEADER_FLAGS));
return tag_header;
}
