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/* NOLINT(build/header_guard) */
/* Copyright 2018 Google Inc. All Rights Reserved.
Distributed under MIT license.
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/
/* template parameters: FN, HASHER_A, HASHER_B */
/* Composite hasher: This hasher allows to combine two other hashers, HASHER_A
and HASHER_B. */
#define HashComposite HASHER()
#define FN_A(X) EXPAND_CAT(X, HASHER_A)
#define FN_B(X) EXPAND_CAT(X, HASHER_B)
static BROTLI_INLINE size_t FN(HashTypeLength)(void) {
size_t a = FN_A(HashTypeLength)();
size_t b = FN_B(HashTypeLength)();
return a > b ? a : b;
}
static BROTLI_INLINE size_t FN(StoreLookahead)(void) {
size_t a = FN_A(StoreLookahead)();
size_t b = FN_B(StoreLookahead)();
return a > b ? a : b;
}
typedef struct HashComposite {
HASHER_A ha;
HASHER_B hb;
HasherCommon ha_common;
HasherCommon hb_common;
/* Shortcuts. */
HasherCommon* common;
BROTLI_BOOL fresh;
const BrotliEncoderParams* params;
} HashComposite;
static void FN(Initialize)(HasherCommon* common,
HashComposite* BROTLI_RESTRICT self, const BrotliEncoderParams* params) {
self->common = common;
self->ha_common = *self->common;
self->hb_common = *self->common;
self->fresh = BROTLI_TRUE;
self->params = params;
/* TODO(lode): Initialize of the hashers is deferred to Prepare (and params
remembered here) because we don't get the one_shot and input_size params
here that are needed to know the memory size of them. Instead provide
those params to all hashers FN(Initialize) */
}
static void FN(Prepare)(
HashComposite* BROTLI_RESTRICT self, BROTLI_BOOL one_shot,
size_t input_size, const uint8_t* BROTLI_RESTRICT data) {
if (self->fresh) {
self->fresh = BROTLI_FALSE;
self->ha_common.extra[0] = self->common->extra[0];
self->ha_common.extra[1] = self->common->extra[1];
self->ha_common.extra[2] = NULL;
self->ha_common.extra[3] = NULL;
self->hb_common.extra[0] = self->common->extra[2];
self->hb_common.extra[1] = self->common->extra[3];
self->hb_common.extra[2] = NULL;
self->hb_common.extra[3] = NULL;
FN_A(Initialize)(&self->ha_common, &self->ha, self->params);
FN_B(Initialize)(&self->hb_common, &self->hb, self->params);
}
FN_A(Prepare)(&self->ha, one_shot, input_size, data);
FN_B(Prepare)(&self->hb, one_shot, input_size, data);
}
static BROTLI_INLINE void FN(HashMemAllocInBytes)(
const BrotliEncoderParams* params, BROTLI_BOOL one_shot,
size_t input_size, size_t* alloc_size) {
size_t alloc_size_a[4] = {0};
size_t alloc_size_b[4] = {0};
FN_A(HashMemAllocInBytes)(params, one_shot, input_size, alloc_size_a);
FN_B(HashMemAllocInBytes)(params, one_shot, input_size, alloc_size_b);
/* Should never happen. */
if (alloc_size_a[2] != 0 || alloc_size_a[3] != 0) exit(EXIT_FAILURE);
if (alloc_size_b[2] != 0 || alloc_size_b[3] != 0) exit(EXIT_FAILURE);
alloc_size[0] = alloc_size_a[0];
alloc_size[1] = alloc_size_a[1];
alloc_size[2] = alloc_size_b[0];
alloc_size[3] = alloc_size_b[1];
}
static BROTLI_INLINE void FN(Store)(HashComposite* BROTLI_RESTRICT self,
const uint8_t* BROTLI_RESTRICT data, const size_t mask, const size_t ix) {
FN_A(Store)(&self->ha, data, mask, ix);
FN_B(Store)(&self->hb, data, mask, ix);
}
static BROTLI_INLINE void FN(StoreRange)(
HashComposite* BROTLI_RESTRICT self, const uint8_t* BROTLI_RESTRICT data,
const size_t mask, const size_t ix_start,
const size_t ix_end) {
FN_A(StoreRange)(&self->ha, data, mask, ix_start, ix_end);
FN_B(StoreRange)(&self->hb, data, mask, ix_start, ix_end);
}
static BROTLI_INLINE void FN(StitchToPreviousBlock)(
HashComposite* BROTLI_RESTRICT self,
size_t num_bytes, size_t position, const uint8_t* ringbuffer,
size_t ring_buffer_mask) {
FN_A(StitchToPreviousBlock)(&self->ha, num_bytes, position,
ringbuffer, ring_buffer_mask);
FN_B(StitchToPreviousBlock)(&self->hb, num_bytes, position,
ringbuffer, ring_buffer_mask);
}
static BROTLI_INLINE void FN(PrepareDistanceCache)(
HashComposite* BROTLI_RESTRICT self, int* BROTLI_RESTRICT distance_cache) {
FN_A(PrepareDistanceCache)(&self->ha, distance_cache);
FN_B(PrepareDistanceCache)(&self->hb, distance_cache);
}
static BROTLI_INLINE void FN(FindLongestMatch)(
HashComposite* BROTLI_RESTRICT self,
const BrotliEncoderDictionary* dictionary,
const uint8_t* BROTLI_RESTRICT data, const size_t ring_buffer_mask,
const int* BROTLI_RESTRICT distance_cache, const size_t cur_ix,
const size_t max_length, const size_t max_backward,
const size_t dictionary_distance, const size_t max_distance,
HasherSearchResult* BROTLI_RESTRICT out) {
FN_A(FindLongestMatch)(&self->ha, dictionary, data, ring_buffer_mask,
distance_cache, cur_ix, max_length, max_backward, dictionary_distance,
max_distance, out);
FN_B(FindLongestMatch)(&self->hb, dictionary, data, ring_buffer_mask,
distance_cache, cur_ix, max_length, max_backward, dictionary_distance,
max_distance, out);
}
#undef HashComposite
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