blob: f2de9375f5be125081dae0b1563c22bb70cd7519 [file] [log] [blame]
// Copyright 2014 The Chromium OS 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 "buffet/data_encoding.h"
#include <base/strings/stringprintf.h>
#include <string.h>
#include "buffet/string_utils.h"
namespace {
inline int HexToDec(int hex) {
int dec = -1;
if (hex >= '0' && hex <= '9') {
dec = hex - '0';
} else if (hex >= 'A' && hex <= 'F') {
dec = hex - 'A' + 10;
} else if (hex >= 'a' && hex <= 'f') {
dec = hex - 'a' + 10;
}
return dec;
}
} // namespace
/////////////////////////////////////////////////////////////////////////
namespace buffet {
namespace data_encoding {
std::string UrlEncode(const char* data, bool encodeSpaceAsPlus) {
std::string result;
while (*data) {
char c = *data++;
// According to RFC3986 (http://www.faqs.org/rfcs/rfc3986.html),
// section 2.3. - Unreserved Characters
if ((c >= '0' && c <= '9') ||
(c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z') ||
c == '-' || c == '.' || c == '_' || c == '~') {
result += c;
} else if (c == ' ' && encodeSpaceAsPlus) {
// For historical reasons, some URLs have spaces encoded as '+',
// this also applies to form data encoded as
// 'application/x-www-form-urlencoded'
result += '+';
} else {
base::StringAppendF(&result, "%%%02X",
static_cast<unsigned char>(c)); // Encode as %NN
}
}
return result;
}
std::string UrlDecode(const char* data) {
std::string result;
while (*data) {
char c = *data++;
int part1 = 0, part2 = 0;
// HexToDec would return -1 even for character 0 (end of string),
// so it is safe to access data[0] and data[1] without overrunning the buf.
if (c == '%' &&
(part1 = HexToDec(data[0])) >= 0 && (part2 = HexToDec(data[1])) >= 0) {
c = static_cast<char>((part1 << 4) | part2);
data += 2;
} else if (c == '+') {
c = ' ';
}
result += c;
}
return result;
}
std::string WebParamsEncode(const WebParamList& params,
bool encodeSpaceAsPlus) {
std::vector<std::string> pairs;
pairs.reserve(params.size());
for (const auto& p : params) {
std::string key = UrlEncode(p.first.c_str(), encodeSpaceAsPlus);
std::string value = UrlEncode(p.second.c_str(), encodeSpaceAsPlus);
pairs.push_back(string_utils::Join('=', key, value));
}
return string_utils::Join('&', pairs);
}
WebParamList WebParamsDecode(const std::string& data) {
WebParamList result;
std::vector<std::string> params = string_utils::Split(data, '&');
for (const auto& p : params) {
auto pair = string_utils::SplitAtFirst(p, '=');
result.emplace_back(UrlDecode(pair.first.c_str()),
UrlDecode(pair.second.c_str()));
}
return result;
}
} // namespace data_encoding
} // namespace buffet