static PyObject *
flac_MetadataSimpleIterator_is_last (flac_MetadataSimpleIteratorObject *self)
{
PyFLAC_CHECK_initialized(self);
return PyFLAC_bool(FLAC__metadata_simple_iterator_is_last(self->iterator));
}
static FLAC__bool write_to_flac_(foreign_metadata_t *fm, FILE *fin, FILE *fout, FLAC__Metadata_SimpleIterator *it, const char **error)
{
FLAC__byte buffer[4];
const unsigned ID_LEN = FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
size_t block_num = 0;
FLAC__ASSERT(sizeof(buffer) >= ID_LEN);
while(block_num < fm->num_blocks) {
/* find next matching padding block */
do {
/* even on the first chunk's loop there will be a skippable STREAMINFO block, on subsequent loops we are first moving past the PADDING we just used */
if(!FLAC__metadata_simple_iterator_next(it)) {
if(error) *error = "no matching PADDING block found (004)";
return false;
}
} while(FLAC__metadata_simple_iterator_get_block_type(it) != FLAC__METADATA_TYPE_PADDING);
if(FLAC__metadata_simple_iterator_get_block_length(it) != ID_LEN+fm->blocks[block_num].size) {
if(error) *error = "PADDING block with wrong size found (005)";
return false;
}
/* transfer chunk into APPLICATION block */
/* first set up the file pointers */
if(fseeko(fin, fm->blocks[block_num].offset, SEEK_SET) < 0) {
if(error) *error = "seek failed in WAVE/AIFF file (006)";
return false;
}
if(fseeko(fout, FLAC__metadata_simple_iterator_get_block_offset(it), SEEK_SET) < 0) {
if(error) *error = "seek failed in FLAC file (007)";
return false;
}
/* update the type */
buffer[0] = FLAC__METADATA_TYPE_APPLICATION;
if(FLAC__metadata_simple_iterator_is_last(it))
buffer[0] |= 0x80; /*MAGIC number*/
if(fwrite(buffer, 1, 1, fout) < 1) {
if(error) *error = "write failed in FLAC file (008)";
return false;
}
/* length stays the same so skip over it */
if(fseeko(fout, FLAC__STREAM_METADATA_LENGTH_LEN/8, SEEK_CUR) < 0) {
if(error) *error = "seek failed in FLAC file (009)";
return false;
}
/* write the APPLICATION ID */
memcpy(buffer, FLAC__FOREIGN_METADATA_APPLICATION_ID[fm->type], ID_LEN);
if(fwrite(buffer, 1, ID_LEN, fout) < ID_LEN) {
if(error) *error = "write failed in FLAC file (010)";
return false;
}
/* transfer the foreign metadata */
if(!copy_data_(fin, fout, fm->blocks[block_num].size, error, "read failed in WAVE/AIFF file (011)", "write failed in FLAC file (012)"))
return false;
block_num++;
}
return true;
}
