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// Copyright 2015 The Weave 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 "src/data_encoding.h"
#include <memory>
#include <base/logging.h>
#include <base/strings/string_util.h>
#include <base/strings/stringprintf.h>
#include "src/string_utils.h"
#include "third_party/modp_b64/modp_b64/modp_b64.h"
namespace weave {
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;
}
// Helper for Base64Encode() and Base64EncodeWrapLines().
std::string Base64EncodeHelper(const void* data, size_t size) {
std::vector<char> buffer;
buffer.resize(modp_b64_encode_len(size));
size_t out_size =
modp_b64_encode(buffer.data(), static_cast<const char*>(data), size);
return std::string{buffer.begin(), buffer.begin() + out_size};
}
} // namespace
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(Join("=", key, value));
}
return Join("&", pairs);
}
WebParamList WebParamsDecode(const std::string& data) {
WebParamList result;
for (const auto& p : Split(data, "&", true, true)) {
auto pair = SplitAtFirst(p, "=", true);
result.emplace_back(UrlDecode(pair.first.c_str()),
UrlDecode(pair.second.c_str()));
}
return result;
}
std::string Base64Encode(const void* data, size_t size) {
return Base64EncodeHelper(data, size);
}
std::string Base64EncodeWrapLines(const void* data, size_t size) {
std::string unwrapped = Base64EncodeHelper(data, size);
std::string wrapped;
for (size_t i = 0; i < unwrapped.size(); i += 64) {
wrapped.append(unwrapped, i, 64);
wrapped.append("\n");
}
return wrapped;
}
bool Base64Decode(const std::string& input, std::vector<uint8_t>* output) {
std::string temp_buffer;
const std::string* data = &input;
if (input.find_first_of("\r\n") != std::string::npos) {
base::ReplaceChars(input, "\n", "", &temp_buffer);
base::ReplaceChars(temp_buffer, "\r", "", &temp_buffer);
data = &temp_buffer;
}
// base64 decoded data has 25% fewer bytes than the original (since every
// 3 source octets are encoded as 4 characters in base64).
// modp_b64_decode_len provides an upper estimate of the size of the output
// data.
output->resize(modp_b64_decode_len(data->size()));
size_t size_read = modp_b64_decode(reinterpret_cast<char*>(output->data()),
data->data(), data->size());
if (size_read == MODP_B64_ERROR) {
output->resize(0);
return false;
}
output->resize(size_read);
return true;
}
} // namespace weave
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