void BrotliStateCleanup(BrotliState* s) {
BrotliStateCleanupAfterMetablock(s);
BROTLI_FREE(s, s->ringbuffer);
BROTLI_FREE(s, s->block_type_trees);
BROTLI_FREE(s, s->legacy_input_buffer);
BROTLI_FREE(s, s->legacy_output_buffer);
}
void BrotliStateCleanupAfterMetablock(BrotliState* s) {
BROTLI_FREE(s, s->context_modes);
BROTLI_FREE(s, s->context_map);
BROTLI_FREE(s, s->dist_context_map);
BrotliHuffmanTreeGroupRelease(s, &s->literal_hgroup);
BrotliHuffmanTreeGroupRelease(s, &s->insert_copy_hgroup);
BrotliHuffmanTreeGroupRelease(s, &s->distance_hgroup);
}
void BrotliHuffmanTreeGroupRelease(BrotliState* s, HuffmanTreeGroup* group) {
BROTLI_FREE(s, group->codes);
group->htrees = NULL;
}
void BrotliSplitBlock(MemoryManager* m,
const Command* cmds,
const size_t num_commands,
const uint8_t* data,
const size_t pos,
const size_t mask,
const BrotliEncoderParams* params,
BlockSplit* literal_split,
BlockSplit* insert_and_copy_split,
BlockSplit* dist_split) {
{
size_t literals_count = CountLiterals(cmds, num_commands);
uint8_t* literals = BROTLI_ALLOC(m, uint8_t, literals_count);
if (BROTLI_IS_OOM(m)) return;
/* Create a continuous array of literals. */
CopyLiteralsToByteArray(cmds, num_commands, data, pos, mask, literals);
/* Create the block split on the array of literals.
Literal histograms have alphabet size 256. */
SplitByteVectorLiteral(
m, literals, literals_count,
kSymbolsPerLiteralHistogram, kMaxLiteralHistograms,
kLiteralStrideLength, kLiteralBlockSwitchCost, params,
literal_split);
if (BROTLI_IS_OOM(m)) return;
BROTLI_FREE(m, literals);
}
{
/* Compute prefix codes for commands. */
uint16_t* insert_and_copy_codes = BROTLI_ALLOC(m, uint16_t, num_commands);
size_t i;
if (BROTLI_IS_OOM(m)) return;
for (i = 0; i < num_commands; ++i) {
insert_and_copy_codes[i] = cmds[i].cmd_prefix_;
}
/* Create the block split on the array of command prefixes. */
SplitByteVectorCommand(
m, insert_and_copy_codes, num_commands,
kSymbolsPerCommandHistogram, kMaxCommandHistograms,
kCommandStrideLength, kCommandBlockSwitchCost, params,
insert_and_copy_split);
if (BROTLI_IS_OOM(m)) return;
/* TODO: reuse for distances? */
BROTLI_FREE(m, insert_and_copy_codes);
}
{
/* Create a continuous array of distance prefixes. */
uint16_t* distance_prefixes = BROTLI_ALLOC(m, uint16_t, num_commands);
size_t j = 0;
size_t i;
if (BROTLI_IS_OOM(m)) return;
for (i = 0; i < num_commands; ++i) {
const Command* cmd = &cmds[i];
if (CommandCopyLen(cmd) && cmd->cmd_prefix_ >= 128) {
distance_prefixes[j++] = cmd->dist_prefix_;
}
}
/* Create the block split on the array of distance prefixes. */
SplitByteVectorDistance(
m, distance_prefixes, j,
kSymbolsPerDistanceHistogram, kMaxCommandHistograms,
kCommandStrideLength, kDistanceBlockSwitchCost, params,
dist_split);
if (BROTLI_IS_OOM(m)) return;
BROTLI_FREE(m, distance_prefixes);
}
}
void BrotliDestroyBlockSplit(MemoryManager* m, BlockSplit* self) {
BROTLI_FREE(m, self->types);
BROTLI_FREE(m, self->lengths);
}
void BrotliDecoderStateCleanup(BrotliDecoderState* s) {
BrotliDecoderStateCleanupAfterMetablock(s);
BROTLI_FREE(s, s->ringbuffer);
BROTLI_FREE(s, s->block_type_trees);
}
