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// Copyright 2017 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.
#include "net/base/hex_utils.h"
#include <algorithm>
#include "base/strings/stringprintf.h"
namespace net {
std::string HexDump(base::StringPiece input) {
const int kBytesPerLine = 16; // Maximum bytes dumped per line.
int offset = 0;
const char* buf = input.data();
int bytes_remaining = input.size();
std::string output;
const char* p = buf;
while (bytes_remaining > 0) {
const int line_bytes = std::min(bytes_remaining, kBytesPerLine);
base::StringAppendF(&output, "0x%04x: ", offset);
for (int i = 0; i < kBytesPerLine; ++i) {
if (i < line_bytes) {
base::StringAppendF(&output, "%02x", static_cast<unsigned char>(p[i]));
} else {
output += " ";
}
if (i % 2) {
output += ' ';
}
}
output += ' ';
for (int i = 0; i < line_bytes; ++i) {
// Replace non-printable characters and 0x20 (space) with '.'
output += (p[i] > 0x20 && p[i] < 0x7f) ? p[i] : '.';
}
bytes_remaining -= line_bytes;
offset += line_bytes;
p += line_bytes;
output += '\n';
}
return output;
}
} // namespace net
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