Check-in rlz code to src\rlz from http://code.google.com/p/rlz/.

rlz/lib/string_utils.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// String manipulation functions used in the RLZ library.
+
+#include "rlz/lib/string_utils.h"
+
+#include "rlz/lib/assert.h"
+
+namespace rlz_lib {
+
+bool IsAscii(char letter) {
+  return (letter >= 0x0 && letter < 0x80);
+}
+
+bool GetHexValue(char letter, int* value) {
+  if (!value) {
+    ASSERT_STRING("GetHexValue: Invalid output paramter");
+    return false;
+  }
+  *value = 0;
+
+  if (letter >= '0' && letter <= '9')
+    *value = letter - '0';
+  else if (letter >= 'a' && letter <= 'f')
+    *value = (letter - 'a') + 0xA;
+  else if (letter >= 'A' && letter <= 'F')
+    *value = (letter - 'A') + 0xA;
+  else
+    return false;
+
+  return true;
+}
+
+int HexStringToInteger(const char* text) {
+  if (!text) {
+    ASSERT_STRING("HexStringToInteger: text is NULL.");
+    return 0;
+  }
+
+  int idx = 0;
+  // Ignore leading whitespace.
+  while (text[idx] == '\t' || text[idx] == ' ')
+    idx++;
+
+  if ((text[idx] == '0') &&
+      (text[idx + 1] == 'X' || text[idx + 1] == 'x'))
+    idx +=2;  // String is of the form 0x...
+
+  int number = 0;
+  int digit = 0;
+  for (; text[idx] != '\0'; idx++) {
+    if (!GetHexValue(text[idx], &digit)) {
+      // Ignore trailing whitespaces, but assert on other trailing characters.
+      bool only_whitespaces = true;
+      while (only_whitespaces && text[idx])
+        only_whitespaces = (text[idx++] == ' ');
+      if (!only_whitespaces)
+        ASSERT_STRING("HexStringToInteger: text contains non-hex characters.");
+      return number;
+    }
+    number = (number << 4) | digit;
+  }
+
+  return number;
+}
+
+bool BytesToString(const unsigned char* data,
+                   int data_len,
+                   std::string* string) {
+  if (!string)
+    return false;
+
+  string->clear();
+  if (data_len < 1 || !data)
+    return false;
+
+  static const char kHex[] = "0123456789ABCDEF";
+
+  // Fix the buffer size to begin with to avoid repeated re-allocation.
+  string->resize(data_len * 2);
+  int index = data_len;
+  while (index--) {
+    string->at(2 * index) = kHex[data[index] >> 4];  // high digit
+    string->at(2 * index + 1) = kHex[data[index] & 0x0F];  // low digit
+  }
+
+  return true;
+}
+
+}  // namespace rlz_lib