Keep only base/extractor.[cc|h].

base/security/b64.c

-// Copyright 2007-2009 Google Inc.
-//
-// Licensed 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 "b64.h"
-
-static const char b64outmap[64] = {
-  'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
-  'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
-  'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
-  'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
-  '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '_'
-};
-
-static const char b64inmap[96] = {
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 63, 0, 0,
-  53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 0, 0, 0, 0, 0, 0,
-  0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
-  16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 0, 0, 0, 0, 64,
-  0, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41,
-  42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 0, 0, 0, 0, 0,
-};
-
-int B64_encode(const uint8_t* input,
-               int input_length,
-               char* output,
-               int output_max) {
-  unsigned int accu = 0;
-  int shift = 0;
-  int output_size = 0;
-
-  while (input_length--) {
-    accu <<= 8;
-    accu |= *input++;
-    shift += 8;
-
-    while (shift >= 6) {
-      if (output_size >= output_max) return -1;  // out of output space
-      output[output_size++] = b64outmap[(accu >> (shift - 6)) & 63];
-      shift -= 6;
-    }
-  }
-  if (shift) {
-    if (output_size >= output_max) return -1;  // out of output space
-    accu <<= 8;  // pad with 0 byte really
-    shift += 8;
-    output[output_size++] = b64outmap[(accu >> (shift - 6)) & 63];
-  }
-
-  // Output terminating 0
-  if (output_size >= output_max) return -1;  // out of output space
-  output[output_size] = '\0';
-
-  return output_size;
-}
-
-int B64_decode(const char* input,
-               uint8_t* output,
-               int output_max) {
-  unsigned int accu = 0;
-  int shift = 0;
-  int output_size = 0;
-
-  while (*input) {
-    unsigned char in = *input++ & 255;
-    if (in < 32 || in > 127 || !b64inmap[in - 32]) return -1;  // invalid input
-    accu <<= 6;
-    accu |= (b64inmap[in - 32] - 1);
-    shift += 6;
-    if (shift >= 8) {
-      if (output_size >= output_max) return -1;  // out of output space
-      output[output_size++] = (accu >> (shift - 8)) & 255;
-      shift -= 8;
-    }
-  }
-  return output_size;
-}