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📄 adler32.c(3.16 KB)
📄 atomic.c(7.23 KB)
📄 auth.c(32.4 KB)
📄 auth.h(6.1 KB)
📄 base64.c(19.18 KB)
📄 bit_array.c(6.26 KB)
📄 cache-inprocess.c(21.2 KB)
📄 cache-membuffer.c(116.43 KB)
📄 cache-memcache.c(17.35 KB)
📄 cache-null.c(4.35 KB)
📄 cache.c(10.22 KB)
📄 cache.h(4.03 KB)
📄 cache_config.c(6.01 KB)
📄 checksum.c(24.17 KB)
📄 checksum.h(2.32 KB)
📄 cmdline.c(58.99 KB)
📄 compat.c(5.28 KB)
📄 compress_lz4.c(4.51 KB)
📄 compress_zlib.c(6.85 KB)
📄 config.c(39.66 KB)
📄 config_auth.c(8.65 KB)
📄 config_file.c(70.25 KB)
📄 config_impl.h(6.15 KB)
📄 config_keys.inc(2.65 KB)
📄 config_win.c(9.61 KB)
📄 crypto.c(25.19 KB)
📄 crypto.h(5.43 KB)
📄 ctype.c(13.81 KB)
📄 date.c(12.86 KB)
📄 debug.c(3.77 KB)
📄 deprecated.c(64.3 KB)
📄 dirent_uri.c(80.17 KB)
📄 dirent_uri.h(1.43 KB)
📄 dso.c(3.74 KB)
📄 encode.c(2.69 KB)
📄 eol.c(2.79 KB)
📄 error.c(24.52 KB)
📄 errorcode.inc(4.27 KB)
📄 fnv1a.c(6.92 KB)
📄 fnv1a.h(3.04 KB)
📄 genctype.py(3.84 KB)
📄 gpg_agent.c(22.29 KB)
📄 hash.c(19.59 KB)
📄 internal_statements.h(1.87 KB)
📄 internal_statements.sql(1.58 KB)
📄 io.c(182.6 KB)
📄 iter.c(3.84 KB)
📄 libsvn_subr.pc.in(515 B)
📄 lock.c(1.69 KB)
📄 log.c(14 KB)
📁 lz4
📄 macos_keychain.c(9.7 KB)
📄 magic.c(5.25 KB)
📄 md5.c(1.8 KB)
📄 mergeinfo.c(89.24 KB)
📄 mutex.c(3.06 KB)
📄 nls.c(3.06 KB)
📄 object_pool.c(9.76 KB)
📄 opt.c(39.34 KB)
📄 opt.h(1.89 KB)
📄 packed_data.c(33.43 KB)
📄 path.c(35.99 KB)
📄 pool.c(4.35 KB)
📄 pools.h(1.45 KB)
📄 prefix_string.c(10.65 KB)
📄 prompt.c(28.82 KB)
📄 properties.c(13.59 KB)
📄 quoprint.c(8.96 KB)
📄 root_pools.c(3.15 KB)
📄 simple_providers.c(25.54 KB)
📄 skel.c(23.04 KB)
📄 sorts.c(15.9 KB)
📄 spillbuf.c(19.78 KB)
📄 sqlite.c(49.68 KB)
📄 sqlite3wrapper.c(3.16 KB)
📄 ssl_client_cert_providers.c(6.66 KB)
📄 ssl_client_cert_pw_providers.c(18.93 KB)
📄 ssl_server_trust_providers.c(7.77 KB)
📄 stream.c(65.69 KB)
📄 string.c(40.2 KB)
📄 subst.c(67.57 KB)
📄 sysinfo.c(43.67 KB)
📄 sysinfo.h(2.58 KB)
📄 target.c(11.58 KB)
📄 temp_serializer.c(14.02 KB)
📄 time.c(9.08 KB)
📄 token.c(2.58 KB)
📄 types.c(9.43 KB)
📄 user.c(2.66 KB)
📄 username_providers.c(9.2 KB)
📄 utf.c(40.38 KB)
📁 utf8proc
📄 utf8proc.c(20.71 KB)
📄 utf_validate.c(13.3 KB)
📄 utf_width.c(10.85 KB)
📄 validate.c(3.35 KB)
📄 version.c(9.89 KB)
📄 win32_crashrpt.c(25.06 KB)
📄 win32_crashrpt.h(1.35 KB)
📄 win32_crashrpt_dll.h(4 KB)
📄 win32_crypto.c(18.12 KB)
📄 win32_xlate.c(7.3 KB)
📄 win32_xlate.h(2.11 KB)
📄 x509.h(3.75 KB)
📄 x509info.c(9.53 KB)
📄 x509parse.c(35.77 KB)
📄 xml.c(20.01 KB)

Editing: adler32.c

/*
 * adler32.c :  routines for handling Adler-32 checksums
 *
 * ====================================================================
 *    Licensed to the Apache Software Foundation (ASF) under one
 *    or more contributor license agreements.  See the NOTICE file
 *    distributed with this work for additional information
 *    regarding copyright ownership.  The ASF licenses this file
 *    to you under the Apache License, Version 2.0 (the
 *    "License"); you may not use this file except in compliance
 *    with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing,
 *    software distributed under the License is distributed on an
 *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *    KIND, either express or implied.  See the License for the
 *    specific language governing permissions and limitations
 *    under the License.
 * ====================================================================
 */

#include <apr.h>
#include <zlib.h>

#include "private/svn_adler32.h"

/**
 * An Adler-32 implementation per RFC1950.
 *
 * "The Adler-32 algorithm is much faster than the CRC32 algorithm yet
 * still provides an extremely low probability of undetected errors"
 */

/*
 * 65521 is the largest prime less than 65536.
 * "That 65521 is prime is important to avoid a possible large class of
 *  two-byte errors that leave the check unchanged."
 */
#define ADLER_MOD_BASE 65521

/*
 * Start with CHECKSUM and update the checksum by processing a chunk
 * of DATA sized LEN.
 */
apr_uint32_t
svn__adler32(apr_uint32_t checksum, const char *data, apr_off_t len)
{
  /* The actual limit can be set somewhat higher but should
   * not be lower because the SIMD code would not be used
   * in that case.
   *
   * However, it must be lower than 5552 to make sure our local
   * implementation does not suffer from overflows.
   */
  if (len >= 80)
    {
      /* Larger buffers can be efficiently handled by Marc Adler's
       * optimized code. Also, new zlib versions will come with
       * SIMD code for x86 and x64.
       */
      return (apr_uint32_t)adler32(checksum,
                                   (const Bytef *)data,
                                   (uInt)len);
    }
  else
    {
      const unsigned char *input = (const unsigned char *)data;
      apr_uint32_t s1 = checksum & 0xFFFF;
      apr_uint32_t s2 = checksum >> 16;
      apr_uint32_t b;

/* Some loop unrolling
       * (approx. one clock tick per byte + 2 ticks loop overhead)
       */
      for (; len >= 8; len -= 8, input += 8)
        {
          s1 += input[0]; s2 += s1;
          s1 += input[1]; s2 += s1;
          s1 += input[2]; s2 += s1;
          s1 += input[3]; s2 += s1;
          s1 += input[4]; s2 += s1;
          s1 += input[5]; s2 += s1;
          s1 += input[6]; s2 += s1;
          s1 += input[7]; s2 += s1;
        }

/* Adler-32 calculation as a simple two ticks per iteration loop.
       */
      while (len--)
        {
          b = *input++;
          s1 += b;
          s2 += s1;
        }

return ((s2 % ADLER_MOD_BASE) << 16) | (s1 % ADLER_MOD_BASE);
    }
}

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Editing: adler32.c

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