internal static unsafe void BrotliDecoderStateCleanup(ref BrotliDecoderState s)
{
BrotliDecoderStateCleanupAfterMetablock(ref s);
s.free_func(s.memory_manager_opaque, s.ringbuffer);
s.ringbuffer = null;
s.free_func(s.memory_manager_opaque, s.block_type_trees);
s.block_type_trees = null;
}
private static unsafe bool BrotliDecoderHuffmanTreeGroupInit(ref BrotliDecoderState s,
HuffmanTreeGroup *group, uint alphabet_size, uint ntrees)
{
/* Pack two allocations into one */
size_t max_table_size = (int)kMaxHuffmanTableSize[(alphabet_size + 31) >> 5];
size_t code_size = sizeof(HuffmanCode) * ntrees * max_table_size;
size_t htree_size = IntPtr.Size * ntrees;
/* Pointer alignment is, hopefully, wider than sizeof(HuffmanCode). */
var p = (HuffmanCode **)s.alloc_func(s.memory_manager_opaque, code_size + htree_size);
group->alphabet_size = (ushort)alphabet_size;
group->num_htrees = (ushort)ntrees;
group->htrees = (HuffmanCode **)p;
group->codes = (HuffmanCode *)(&p[ntrees]);
return(p != null);
}
private static unsafe void BrotliDecoderStateCleanupAfterMetablock(ref BrotliDecoderState s)
{
s.free_func(s.memory_manager_opaque, s.context_modes);
s.context_modes = null;
s.free_func(s.memory_manager_opaque, s.context_map);
s.context_map = null;
s.free_func(s.memory_manager_opaque, s.dist_context_map);
s.dist_context_map = null;
fixed(HuffmanTreeGroup *lh = &s.literal_hgroup)
fixed(HuffmanTreeGroup * ich = &s.insert_copy_hgroup)
fixed(HuffmanTreeGroup * dh = &s.distance_hgroup)
{
BrotliDecoderHuffmanTreeGroupRelease(ref s, lh);
BrotliDecoderHuffmanTreeGroupRelease(ref s, ich);
BrotliDecoderHuffmanTreeGroupRelease(ref s, dh);
}
}
private static unsafe void BrotliDecoderStateMetablockBegin(ref BrotliDecoderState s)
{
s.meta_block_remaining_len = 0;
fixed(uint *bl = s.block_length)
{
bl[0] = 1U << 28;
bl[1] = 1U << 28;
bl[2] = 1U << 28;
}
fixed(uint *nbt = s.num_block_types)
{
nbt[0] = 1;
nbt[1] = 1;
nbt[2] = 1;
}
fixed(uint *btr = s.block_type_rb)
{
btr[0] = 1;
btr[1] = 0;
btr[2] = 1;
btr[3] = 0;
btr[4] = 1;
btr[5] = 0;
}
s.context_map = null;
s.context_modes = null;
s.dist_context_map = null;
s.context_map_slice = null;
s.literal_htree = null;
s.dist_context_map_slice = null;
s.dist_htree_index = 0;
s.context_lookup1 = null;
s.context_lookup2 = null;
s.literal_hgroup.codes = null;
s.literal_hgroup.htrees = null;
s.insert_copy_hgroup.codes = null;
s.insert_copy_hgroup.htrees = null;
s.distance_hgroup.codes = null;
s.distance_hgroup.htrees = null;
}
internal static unsafe void BrotliDecoderStateInit(ref BrotliDecoderState s)
{
BrotliDecoderStateInitWithCustomAllocators(ref s, null, null, null);
}
private static unsafe void BrotliDecoderStateInitWithCustomAllocators(
ref BrotliDecoderState s, brotli_alloc_func alloc_func, brotli_free_func free_func,
void *opaque)
{
if (alloc_func == null)
{
s.alloc_func = DefaultAllocFunc;
s.free_func = DefaultFreeFunc;
s.memory_manager_opaque = null;
}
else
{
s.alloc_func = alloc_func;
s.free_func = free_func;
s.memory_manager_opaque = opaque;
}
fixed(BrotliBitReader *br = &s.br)
BrotliInitBitReader(br);
s.state = BrotliRunningState.BROTLI_STATE_UNINITED;
s.substate_metablock_header = BrotliRunningMetablockHeaderState.BROTLI_STATE_METABLOCK_HEADER_NONE;
s.substate_tree_group = BrotliRunningTreeGroupState.BROTLI_STATE_TREE_GROUP_NONE;
s.substate_context_map = BrotliRunningContextMapState.BROTLI_STATE_CONTEXT_MAP_NONE;
s.substate_uncompressed = BrotliRunningUncompressedState.BROTLI_STATE_UNCOMPRESSED_NONE;
s.substate_huffman = BrotliRunningHuffmanState.BROTLI_STATE_HUFFMAN_NONE;
s.substate_decode_uint8 = BrotliRunningDecodeUint8State.BROTLI_STATE_DECODE_UINT8_NONE;
s.substate_read_block_length = BrotliRunningReadBlockLengthState.BROTLI_STATE_READ_BLOCK_LENGTH_NONE;
s.buffer_length = 0;
s.loop_counter = 0;
s.pos = 0;
s.rb_roundtrips = 0;
s.partial_pos_out = 0;
s.block_type_trees = null;
s.block_len_trees = null;
s.ringbuffer = null;
s.ringbuffer_size = 0;
s.new_ringbuffer_size = 0;
s.ringbuffer_mask = 0;
s.context_map = null;
s.context_modes = null;
s.dist_context_map = null;
s.context_map_slice = null;
s.dist_context_map_slice = null;
s.sub_loop_counter = 0;
s.literal_hgroup.codes = null;
s.literal_hgroup.htrees = null;
s.insert_copy_hgroup.codes = null;
s.insert_copy_hgroup.htrees = null;
s.distance_hgroup.codes = null;
s.distance_hgroup.htrees = null;
s.custom_dict = null;
s.custom_dict_size = 0;
s.is_last_metablock = false;
s.should_wrap_ringbuffer = false;
s.window_bits = 0;
s.max_distance = 0;
fixed(int *rb = s.dist_rb)
{
rb[0] = 16;
rb[1] = 15;
rb[2] = 11;
rb[3] = 4;
}
s.dist_rb_idx = 0;
s.block_type_trees = null;
s.block_len_trees = null;
s.mtf_upper_bound = 63;
}
