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/*
* Copyright (C) 2019 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "HexNumber.h"
#include <wtf/ASCIICType.h>
#include <wtf/CheckedArithmetic.h>
#include <wtf/IndexedRange.h>
#include <wtf/PrintStream.h>
#include <wtf/StdLibExtras.h>
#include <wtf/text/StringView.h>
namespace WTF {
namespace Internal {
static const std::array<Latin1Character, 16>& hexDigitsForMode(HexConversionMode mode)
{
static constexpr std::array<Latin1Character, 16> lowercaseHexDigits { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
static constexpr std::array<Latin1Character, 16> uppercaseHexDigits { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
return mode == Lowercase ? lowercaseHexDigits : uppercaseHexDigits;
}
std::span<Latin1Character> appendHex(std::span<Latin1Character> buffer, std::uintmax_t number, unsigned minimumDigits, HexConversionMode mode)
{
size_t startIndex = buffer.size();
auto& hexDigits = hexDigitsForMode(mode);
do {
buffer[--startIndex] = hexDigits[number & 0xF];
number >>= 4;
} while (number);
auto startIndexWithLeadingZeros = buffer.size() - std::min<size_t>(minimumDigits, buffer.size());
if (startIndex > startIndexWithLeadingZeros) {
memsetSpan(buffer.subspan(startIndexWithLeadingZeros, startIndex - startIndexWithLeadingZeros), '0');
startIndex = startIndexWithLeadingZeros;
}
return buffer.subspan(startIndex);
}
}
void printInternal(PrintStream& out, HexNumberBuffer buffer)
{
out.print(StringView(buffer.span()));
}
static void toHexInternal(std::span<const uint8_t> values, std::span<Latin1Character> hexadecimalOutput)
{
for (auto [i, digestValue] : indexedRange(values)) {
hexadecimalOutput[i * 2] = upperNibbleToASCIIHexDigit(digestValue);
hexadecimalOutput[i * 2 + 1] = lowerNibbleToASCIIHexDigit(digestValue);
}
}
CString toHexCString(std::span<const uint8_t> values)
{
std::span<char> buffer;
auto result = CString::newUninitialized(CheckedSize(values.size()) * 2U, buffer);
toHexInternal(values, byteCast<Latin1Character>(buffer));
return result;
}
String toHexString(std::span<const uint8_t> values)
{
std::span<Latin1Character> buffer;
auto result = String::createUninitialized(CheckedSize(values.size()) * 2U, buffer);
toHexInternal(values, buffer);
return result;
}
} // namespace WTF
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