static int lha_lh_new_init(void *data, LHADecoderCallback callback,
void *callback_data)
{
LHANewDecoder *decoder = data;
// Initialize input stream reader.
bit_stream_reader_init(&decoder->bit_stream_reader,
callback, callback_data);
// Initialize data structures.
init_ring_buffer(decoder);
// First read starts the first block.
decoder->block_remaining = 0;
// Initialize tree tables to a known state.
init_tree(decoder->code_tree, NUM_CODES * 2);
init_tree(decoder->offset_tree, MAX_TEMP_CODES * 2);
return 1;
}
static int lha_pm2_decoder_init(void *data, LHADecoderCallback callback,
void *callback_data)
{
LHAPM2Decoder *decoder = data;
bit_stream_reader_init(&decoder->bit_stream_reader,
callback, callback_data);
// Tree has not been built yet. It needs to be built on
// the first call to read().
decoder->tree_state = PM2_REBUILD_UNBUILT;
decoder->tree_rebuild_remaining = 0;
// Initialize ring buffer contents.
memset(&decoder->ringbuf, ' ', RING_BUFFER_SIZE);
decoder->ringbuf_pos = 0;
// Init history lookup list.
init_history(decoder);
// Initialize the lookup trees to a known state.
init_tree(decoder->code_tree, CODE_TREE_ELEMENTS);
init_tree(decoder->offset_tree, OFFSET_TREE_ELEMENTS);
return 1;
}
static int lha_lzs_init(void *data, LHADecoderCallback callback,
void *callback_data)
{
LHALZSDecoder *decoder = data;
memset(decoder->ringbuf, ' ', RING_BUFFER_SIZE);
decoder->ringbuf_pos = RING_BUFFER_SIZE - START_OFFSET;
bit_stream_reader_init(&decoder->bit_stream_reader, callback,
callback_data);
return 1;
}
static int lha_pm1_init(void *data, LHADecoderCallback callback,
void *callback_data)
{
LHAPM1Decoder *decoder = data;
memset(decoder, 0, sizeof(LHAPM1Decoder));
bit_stream_reader_init(&decoder->bit_stream_reader,
callback, callback_data);
decoder->output_stream_pos = 0;
decoder->byte_decode_tree = NULL;
decoder->ringbuf_pos = 0;
init_history_list(&decoder->history_list);
return 1;
}
static int lha_lh1_init(void *data, LHADecoderCallback callback,
void *callback_data)
{
LHALH1Decoder *decoder = data;
// Initialize input stream reader.
bit_stream_reader_init(&decoder->bit_stream_reader,
callback, callback_data);
// Initialize data structures.
init_groups(decoder);
init_tree(decoder);
init_offset_table(decoder);
init_ring_buffer(decoder);
return 1;
}