mirror of
https://github.com/google/brotli.git
synced 2024-11-26 05:20:04 +00:00
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
/* NOLINT(build/header_guard) */
|
|
/* Copyright 2013 Google Inc. All Rights Reserved.
|
|
|
|
Distributed under MIT license.
|
|
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
|
|
*/
|
|
|
|
/* template parameters: Histogram, DATA_SIZE, DataType */
|
|
|
|
/* A simple container for histograms of data in blocks. */
|
|
|
|
typedef struct FN(Histogram) {
|
|
uint32_t data_[DATA_SIZE];
|
|
size_t total_count_;
|
|
double bit_cost_;
|
|
} FN(Histogram);
|
|
|
|
static BROTLI_INLINE void FN(HistogramClear)(FN(Histogram)* self) {
|
|
memset(self->data_, 0, sizeof(self->data_));
|
|
self->total_count_ = 0;
|
|
self->bit_cost_ = HUGE_VAL;
|
|
}
|
|
|
|
static BROTLI_INLINE void FN(ClearHistograms)(
|
|
FN(Histogram)* array, size_t length) {
|
|
size_t i;
|
|
for (i = 0; i < length; ++i) FN(HistogramClear)(array + i);
|
|
}
|
|
|
|
static BROTLI_INLINE void FN(HistogramAdd)(FN(Histogram)* self, size_t val) {
|
|
++self->data_[val];
|
|
++self->total_count_;
|
|
}
|
|
|
|
static BROTLI_INLINE void FN(HistogramAddVector)(FN(Histogram)* self,
|
|
const DataType *p, size_t n) {
|
|
self->total_count_ += n;
|
|
n += 1;
|
|
while (--n) ++self->data_[*p++];
|
|
}
|
|
|
|
static BROTLI_INLINE void FN(HistogramAddHistogram)(FN(Histogram)* self,
|
|
const FN(Histogram)* v) {
|
|
size_t i;
|
|
self->total_count_ += v->total_count_;
|
|
for (i = 0; i < DATA_SIZE; ++i) {
|
|
self->data_[i] += v->data_[i];
|
|
}
|
|
}
|
|
|
|
static BROTLI_INLINE size_t FN(HistogramDataSize)(void) { return DATA_SIZE; }
|