chromium/third_party/zstd/src/lib/compress/zstd_compress_literals.c

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 * All rights reserved.
 *
 * This source code is licensed under both the BSD-style license (found in the
 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
 * in the COPYING file in the root directory of this source tree).
 * You may select, at your option, one of the above-listed licenses.
 */

 /*-*************************************
 *  Dependencies
 ***************************************/
#include "zstd_compress_literals.h"


/* **************************************************************
*  Debug Traces
****************************************************************/
#if DEBUGLEVEL >= 2

static size_t showHexa(const void* src, size_t srcSize)
{
    const BYTE* const ip = (const BYTE*)src;
    size_t u;
    for (u=0; u<srcSize; u++) {
        RAWLOG(5, " %02X", ip[u]); (void)ip;
    }
    RAWLOG(5, " \n");
    return srcSize;
}

#endif


/* **************************************************************
*  Literals compression - special cases
****************************************************************/
size_t ZSTD_noCompressLiterals (void* dst, size_t dstCapacity, const void* src, size_t srcSize)
{ … }

static int allBytesIdentical(const void* src, size_t srcSize)
{ … }

size_t ZSTD_compressRleLiteralsBlock (void* dst, size_t dstCapacity, const void* src, size_t srcSize)
{ … }

/* ZSTD_minLiteralsToCompress() :
 * returns minimal amount of literals
 * for literal compression to even be attempted.
 * Minimum is made tighter as compression strategy increases.
 */
static size_t
ZSTD_minLiteralsToCompress(ZSTD_strategy strategy, HUF_repeat huf_repeat)
{ … }

size_t ZSTD_compressLiterals (
                  void* dst, size_t dstCapacity,
            const void* src, size_t srcSize,
                  void* entropyWorkspace, size_t entropyWorkspaceSize,
            const ZSTD_hufCTables_t* prevHuf,
                  ZSTD_hufCTables_t* nextHuf,
                  ZSTD_strategy strategy,
                  int disableLiteralCompression,
                  int suspectUncompressible,
                  int bmi2)
{ … }