d0500757df
This fixes this warning from a recent version of Clang:
rlz/lib/string_utils.cc:14:35: error: comparison of constant 128 with
expression of type 'char' is always true
[-Werror,-Wtautological-constant-out-of-range-compare]
return (letter >= 0x0 && letter < 0x80);
~~~~~~ ^ ~~~~
BUG=163104
Review URL: https://chromiumcodereview.appspot.com/11434029
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170265 0039d316-1c4b-4281-b951-d872f2087c98
93 lines
2.2 KiB
C++
93 lines
2.2 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// String manipulation functions used in the RLZ library.
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#include "rlz/lib/string_utils.h"
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#include "rlz/lib/assert.h"
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namespace rlz_lib {
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bool IsAscii(unsigned char letter) {
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return letter < 0x80;
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}
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bool GetHexValue(char letter, int* value) {
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if (!value) {
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ASSERT_STRING("GetHexValue: Invalid output paramter");
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return false;
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}
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*value = 0;
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if (letter >= '0' && letter <= '9')
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*value = letter - '0';
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else if (letter >= 'a' && letter <= 'f')
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*value = (letter - 'a') + 0xA;
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else if (letter >= 'A' && letter <= 'F')
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*value = (letter - 'A') + 0xA;
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else
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return false;
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return true;
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}
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int HexStringToInteger(const char* text) {
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if (!text) {
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ASSERT_STRING("HexStringToInteger: text is NULL.");
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return 0;
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}
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int idx = 0;
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// Ignore leading whitespace.
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while (text[idx] == '\t' || text[idx] == ' ')
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idx++;
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if ((text[idx] == '0') &&
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(text[idx + 1] == 'X' || text[idx + 1] == 'x'))
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idx +=2; // String is of the form 0x...
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int number = 0;
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int digit = 0;
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for (; text[idx] != '\0'; idx++) {
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if (!GetHexValue(text[idx], &digit)) {
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// Ignore trailing whitespaces, but assert on other trailing characters.
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bool only_whitespaces = true;
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while (only_whitespaces && text[idx])
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only_whitespaces = (text[idx++] == ' ');
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if (!only_whitespaces)
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ASSERT_STRING("HexStringToInteger: text contains non-hex characters.");
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return number;
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}
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number = (number << 4) | digit;
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}
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return number;
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}
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bool BytesToString(const unsigned char* data,
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int data_len,
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std::string* string) {
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if (!string)
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return false;
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string->clear();
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if (data_len < 1 || !data)
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return false;
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static const char kHex[] = "0123456789ABCDEF";
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// Fix the buffer size to begin with to avoid repeated re-allocation.
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string->resize(data_len * 2);
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int index = data_len;
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while (index--) {
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string->at(2 * index) = kHex[data[index] >> 4]; // high digit
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string->at(2 * index + 1) = kHex[data[index] & 0x0F]; // low digit
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}
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return true;
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}
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} // namespace rlz_lib
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