1 files changed, 63 insertions, 0 deletions
diff --git a/modules/brotli/enc/histogram.h b/modules/brotli/enc/histogram.h
new file mode 100644
index 000000000..42af3c3f9
--- /dev/null
+++ b/modules/brotli/enc/histogram.h
@@ -0,0 +1,63 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Models the histograms of literals, commands and distance codes. */
+
+#ifndef BROTLI_ENC_HISTOGRAM_H_
+#define BROTLI_ENC_HISTOGRAM_H_
+
+#include <string.h>  /* memset */
+
+#include "../common/constants.h"
+#include "../common/context.h"
+#include "../common/platform.h"
+#include <brotli/types.h>
+#include "./block_splitter.h"
+#include "./command.h"
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+/* The distance symbols effectively used by "Large Window Brotli" (32-bit). */
+#define BROTLI_NUM_HISTOGRAM_DISTANCE_SYMBOLS 544
+
+#define FN(X) X ## Literal
+#define DATA_SIZE BROTLI_NUM_LITERAL_SYMBOLS
+#define DataType uint8_t
+#include "./histogram_inc.h"  /* NOLINT(build/include) */
+#undef DataType
+#undef DATA_SIZE
+#undef FN
+
+#define FN(X) X ## Command
+#define DataType uint16_t
+#define DATA_SIZE BROTLI_NUM_COMMAND_SYMBOLS
+#include "./histogram_inc.h"  /* NOLINT(build/include) */
+#undef DATA_SIZE
+#undef FN
+
+#define FN(X) X ## Distance
+#define DATA_SIZE BROTLI_NUM_HISTOGRAM_DISTANCE_SYMBOLS
+#include "./histogram_inc.h"  /* NOLINT(build/include) */
+#undef DataType
+#undef DATA_SIZE
+#undef FN
+
+BROTLI_INTERNAL void BrotliBuildHistogramsWithContext(
+    const Command* cmds, const size_t num_commands,
+    const BlockSplit* literal_split, const BlockSplit* insert_and_copy_split,
+    const BlockSplit* dist_split, const uint8_t* ringbuffer, size_t pos,
+    size_t mask, uint8_t prev_byte, uint8_t prev_byte2,
+    const ContextType* context_modes, HistogramLiteral* literal_histograms,
+    HistogramCommand* insert_and_copy_histograms,
+    HistogramDistance* copy_dist_histograms);
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}  /* extern "C" */
+#endif
+
+#endif  /* BROTLI_ENC_HISTOGRAM_H_ */