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#include "libfilezilla/buffer.hpp"
#include "libfilezilla/encode.hpp"
namespace fz {
namespace {
template<typename DataContainer>
void base64_encode_impl(std::string & out, DataContainer const& in, base64_type type, bool pad)
{
static_assert(sizeof(typename DataContainer::value_type) == 1, "Bad container type");
std::string::value_type const* const base64_chars =
(type == base64_type::standard)
? "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
size_t len = in.size();
size_t pos{};
size_t const newcap = out.size() + ((len + 2) / 3) * 4;
if (out.capacity() < newcap) {
out.reserve(newcap);
}
while (len >= 3) {
len -= 3;
auto const c1 = static_cast<unsigned char>(in[pos++]);
auto const c2 = static_cast<unsigned char>(in[pos++]);
auto const c3 = static_cast<unsigned char>(in[pos++]);
out += base64_chars[(c1 >> 2) & 0x3fu];
out += base64_chars[((c1 & 0x3u) << 4) | ((c2 >> 4) & 0xfu)];
out += base64_chars[((c2 & 0xfu) << 2) | ((c3 >> 6) & 0x3u)];
out += base64_chars[(c3 & 0x3fu)];
}
if (len) {
auto const c1 = static_cast<unsigned char>(in[pos++]);
out += base64_chars[(c1 >> 2) & 0x3fu];
if (len == 2) {
auto const c2 = static_cast<unsigned char>(in[pos++]);
out += base64_chars[((c1 & 0x3u) << 4) | ((c2 >> 4) & 0xfu)];
out += base64_chars[(c2 & 0xfu) << 2];
}
else {
out += base64_chars[(c1 & 0x3u) << 4];
if (pad) {
out += '=';
}
}
if (pad) {
out += '=';
}
}
}
}
std::string base64_encode(std::string_view const& in, base64_type type, bool pad)
{
std::string ret;
base64_encode_impl(ret, in, type, pad);
return ret;
}
std::string base64_encode(std::vector<uint8_t> const& in, base64_type type, bool pad)
{
std::string ret;
base64_encode_impl(ret, in, type, pad);
return ret;
}
std::string base64_encode(fz::buffer const& in, base64_type type, bool pad)
{
std::string ret;
base64_encode_impl(ret, in.to_view(), type, pad);
return ret;
}
void base64_encode_append(std::string& result, std::string_view const& in, base64_type type, bool pad)
{
base64_encode_impl(result, in, type, pad);
}
namespace {
template<typename Ret, typename View>
Ret base64_decode_impl(View const& in)
{
using Unsigned = std::make_unsigned_t<typename View::value_type>;
unsigned char const chars[256] =
{
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x80, 0xff, 0x80, 0x80, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x80, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3e, 0xff, 0x3e, 0xff, 0x3f,
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff, 0xff, 0xff, 0x40, 0xff, 0xff,
0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0x3f,
0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};
Ret ret;
ret.reserve((in.size() / 4) * 3);
size_t pos{};
size_t len = in.size();
// Trim trailing whitespace
while (len && static_cast<Unsigned>(in[len - 1]) <= 255 && chars[static_cast<unsigned char>(in[len - 1])] == 0x80) {
--len;
}
auto next = [&]() {
while (pos < len) {
auto const u = static_cast<Unsigned>(in[pos++]);
unsigned char c = (u <= 255) ? chars[u] : 0xffu;
if (c != 0x80u) {
return c;
}
}
return static_cast<unsigned char>(0x40u);
};
while (pos < len) {
auto c1 = next();
auto c2 = next();
auto c3 = next();
auto c4 = next();
if (c1 == 0xff || c1 == 0x40 ||
c2 == 0xff || c2 == 0x40 ||
c3 == 0xff || c4 == 0xff)
{
// Bad input
return Ret();
}
if (c4 == 0x40) {
// Pad
if (pos < len) {
// Not at end of string
return Ret();
}
ret.push_back((c1 << 2) | ((c2 >> 4) & 0x3));
if (c3 != 0x40) {
ret.push_back(((c2 & 0xf) << 4) | ((c3 >> 2) & 0xf));
}
}
else {
if (c3 == 0x40) {
// Bad input
return Ret();
}
ret.push_back((c1 << 2) | ((c2 >> 4) & 0x3));
ret.push_back(((c2 & 0xf) << 4) | ((c3 >> 2) & 0xf));
ret.push_back(((c3 & 0x3) << 6) | c4);
}
}
return ret;
}
}
std::vector<uint8_t> base64_decode(std::string_view const& in)
{
return base64_decode_impl<std::vector<uint8_t>>(in);
}
std::vector<uint8_t> base64_decode(std::wstring_view const& in)
{
return base64_decode_impl<std::vector<uint8_t>>(in);
}
std::vector<uint8_t> base64_decode(fz::buffer const& in)
{
return base64_decode_impl<std::vector<uint8_t>>(in.to_view());
}
std::string base64_decode_s(std::string_view const& in)
{
return base64_decode_impl<std::string>(in);
}
std::string base64_decode_s(std::wstring_view const& in)
{
return base64_decode_impl<std::string>(in);
}
std::string base64_decode_s(fz::buffer const& in)
{
return base64_decode_impl<std::string>(in.to_view());
}
namespace {
template<typename DataContainer>
std::string base32_encode_impl(DataContainer const& in, base32_type type, bool pad)
{
static_assert(sizeof(typename DataContainer::value_type) == 1, "Bad container type");
std::string::value_type const* const base32_chars =
(type == base32_type::standard)
? "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"
: (type == base32_type::base32hex)
? "0123456789ABCDEFGHIJKLMNOPQRSTUV"
: "123456789ABCDEFGHJKMNPQRSTUVWXYZ";
std::string ret;
size_t len = in.size();
size_t pos{};
ret.reserve(((len + 4) / 5) * 8);
while (len >= 5) {
len -= 5;
auto const c1 = static_cast<unsigned char>(in[pos++]);
auto const c2 = static_cast<unsigned char>(in[pos++]);
auto const c3 = static_cast<unsigned char>(in[pos++]);
auto const c4 = static_cast<unsigned char>(in[pos++]);
auto const c5 = static_cast<unsigned char>(in[pos++]);
ret += base32_chars[(c1 >> 3) & 0x1fu];
ret += base32_chars[((c1 & 0x7u) << 2) | ((c2 >> 6) & 0x3u)];
ret += base32_chars[(c2 >> 1) & 0x1fu];
ret += base32_chars[((c2 & 0x1u) << 4) | ((c3 >> 4) & 0xfu)];
ret += base32_chars[((c3 & 0xfu) << 1) | ((c4 >> 7) & 0x1u)];
ret += base32_chars[(c4 >> 2) & 0x1fu];
ret += base32_chars[((c4 & 0x3u) << 3) | ((c5 >> 5) & 0x7u)];
ret += base32_chars[c5 & 0x1fu];
}
if (len) {
auto const c1 = static_cast<unsigned char>(in[pos++]);
ret += base32_chars[(c1 >> 3) & 0x1fu];
if (len >= 2) {
auto const c2 = static_cast<unsigned char>(in[pos++]);
ret += base32_chars[((c1 & 0x7u) << 2) | ((c2 >> 6) & 0x3u)];
ret += base32_chars[(c2 >> 1) & 0x1fu];
if (len >= 3) {
auto const c3 = static_cast<unsigned char>(in[pos++]);
ret += base32_chars[((c2 & 0x1u) << 4) | ((c3 >> 4) & 0xfu)];
if (len >= 4) {
auto const c4 = static_cast<unsigned char>(in[pos++]);
ret += base32_chars[((c3 & 0xfu) << 1) | ((c4 >> 7) & 0x1u)];
ret += base32_chars[(c4 >> 2) & 0x1fu];
ret += base32_chars[((c4 & 0x3u) << 3)];
if (pad) {
ret += '=';
}
}
else {
ret += base32_chars[((c3 & 0xfu) << 1)];
if (pad) {
ret += "===";
}
}
}
else {
ret += base32_chars[((c2 & 0x1u) << 4)];
if (pad) {
ret += "====";
}
}
}
else {
ret += base32_chars[((c1 & 0x7u) << 2)];
if (pad) {
ret += "======";
}
}
}
return ret;
}
}
std::string base32_encode(std::string_view const& in, base32_type type, bool pad)
{
return base32_encode_impl(in, type, pad);
}
std::string base32_encode(std::vector<uint8_t> const& in, base32_type type, bool pad)
{
return base32_encode_impl(in, type, pad);
}
std::string base32_encode(fz::buffer const& in, base32_type type, bool pad)
{
return base32_encode_impl(in.to_view(), type, pad);
}
namespace {
template<typename Ret, typename View>
Ret base32_decode_impl(View const& in, base32_type type)
{
using Unsigned = std::make_unsigned_t<typename View::value_type>;
unsigned char const chars_s[256] =
{
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x80, 0xff, 0x80, 0x80, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x80, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x00, 0x00, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0x40, 0xff, 0xff,
0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};
unsigned char const chars_h[256] =
{
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x80, 0xff, 0x80, 0x80, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x80, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0xff, 0xff, 0xff, 0x40, 0xff, 0xff,
0xff, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};
unsigned char const chars_l[256] =
{
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x80, 0xff, 0x80, 0x80, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x80, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0xff, 0xff, 0x40, 0xff, 0xff,
0xff, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0xff, 0x11, 0x12, 0xff, 0x13, 0x14, 0xff,
0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0xff, 0x11, 0x12, 0xff, 0x13, 0x14, 0xff,
0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};
auto const chars = (type == base32_type::standard) ? chars_s : (type == base32_type::base32hex) ? chars_h : chars_l;
Ret ret;
ret.reserve((in.size() / 8) * 5);
size_t pos{};
size_t len = in.size();
// Trim trailing whitespace
while (len && static_cast<Unsigned>(in[len - 1]) <= 255 && chars[static_cast<unsigned char>(in[len - 1])] == 0x80) {
--len;
}
unsigned char end{};
auto next = [&]() -> unsigned char {
while (pos < len) {
auto const u = static_cast<Unsigned>(in[pos++]);
unsigned char c = (u <= 255) ? chars[u] : 0xffu;
if (c == 0x80u) {
continue;
}
if (end) {
if (c != end) {
end = 0xffu;
}
return end;
}
else if (c == 0xffu || c == 0x40u) {
end = c;
}
return c;
}
return end ? end : 0x40u;
};
while (pos < len) {
auto const c1 = next();
auto const c2 = next();
auto const c3 = next();
auto const c4 = next();
auto const c5 = next();
auto const c6 = next();
auto const c7 = next();
auto const c8 = next();
if (c2 == 0x40 || c8 == 0xff) {
// Bad input
return Ret();
}
ret.push_back((c1 << 3) | ((c2 >> 2) & 0x7));
if (c3 != 0x40) {
if (c4 == 0x40) {
// Bad input
return Ret();
}
ret.push_back(((c2 & 0x3) << 6) | (c3 << 1) | ((c4 >> 4) & 0x1));
if (c5 != 0x40) {
ret.push_back(((c4 & 0xf) << 4) | (c5 >> 1));
if (c6 != 0x40) {
if (c7 == 0x40) {
// Bad input
return Ret();
}
ret.push_back(((c5 & 0x1) << 7) | (c6 << 2) | ((c7 >> 3) & 0x3));
if (c8 != 0x40) {
ret.push_back(((c7 & 0x7) << 5) | c8);
}
}
}
}
}
return ret;
}
}
std::vector<uint8_t> base32_decode(std::string_view const& in, base32_type type)
{
return base32_decode_impl<std::vector<uint8_t>>(in, type);
}
std::vector<uint8_t> base32_decode(std::wstring_view const& in, base32_type type)
{
return base32_decode_impl<std::vector<uint8_t>>(in, type);
}
std::vector<uint8_t> base32_decode(fz::buffer const& in, base32_type type)
{
return base32_decode_impl<std::vector<uint8_t>>(in.to_view(), type);
}
std::string base32_decode_s(std::string_view const& in, base32_type type)
{
return base32_decode_impl<std::string>(in, type);
}
std::string base32_decode_s(std::wstring_view const& in, base32_type type)
{
return base32_decode_impl<std::string>(in, type);
}
std::string base32_decode_s(fz::buffer const& in, base32_type type)
{
return base32_decode_impl<std::string>(in.to_view(), type);
}
std::string percent_encode(std::string_view const& s, bool keep_slashes)
{
std::string ret;
ret.reserve(s.size());
for (auto const& c : s) {
if (!c) {
break;
}
else if ((c >= '0' && c <= '9') ||
(c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') ||
c == '-' || c == '.' || c == '_' || c == '~')
{
ret += c;
}
else if (c == '/' && keep_slashes) {
ret += c;
}
else {
ret += '%';
ret += int_to_hex_char<char, false>(static_cast<unsigned char>(c) >> 4);
ret += int_to_hex_char<char, false>(c & 0xf);
}
}
return ret;
}
std::string percent_encode(std::wstring_view const& s, bool keep_slashes)
{
return percent_encode(to_utf8(s), keep_slashes);
}
std::wstring percent_encode_w(std::wstring_view const& s, bool keep_slashes)
{
return to_wstring(percent_encode(s, keep_slashes));
}
namespace {
template<typename Ret, typename View>
Ret percent_decode_impl(View const & s, bool allow_embedded_null, bool plus_is_space)
{
Ret ret;
ret.reserve(s.size());
auto const* c = s.data();
auto const* const end = c + s.size();
while (c < end) {
if (*c == '%') {
if (++c == end) {
return Ret();
}
int const high = hex_char_to_int(*c);
if (high == -1) {
return Ret();
}
if (++c == end) {
return Ret();
}
int const low = hex_char_to_int(*c);
if (low == -1) {
return Ret();
}
if (!high && !low && !allow_embedded_null) {
return Ret();
}
ret.push_back(static_cast<typename Ret::value_type>(static_cast<uint8_t>((high << 4) + low)));
}
else if (plus_is_space && *c == '+') {
ret.push_back(static_cast<typename Ret::value_type>(' '));
}
else {
if (!*c && !allow_embedded_null) {
return Ret();
}
using Unsigned = std::make_unsigned_t<typename View::value_type>;
auto const u = static_cast<Unsigned>(*c);
if (u > 255) {
return Ret();
}
ret.push_back(static_cast<typename Ret::value_type>(u));
}
++c;
}
return ret;
}
}
std::vector<uint8_t> percent_decode(std::string_view const& s, bool allow_embedded_null, bool plus_is_space)
{
return percent_decode_impl<std::vector<uint8_t>>(s, allow_embedded_null, plus_is_space);
}
std::vector<uint8_t> percent_decode(std::wstring_view const& s, bool allow_embedded_null, bool plus_is_space)
{
return percent_decode_impl<std::vector<uint8_t>>(s, allow_embedded_null, plus_is_space);
}
std::string percent_decode_s(std::string_view const& s, bool allow_embedded_null, bool plus_is_space)
{
return percent_decode_impl<std::string>(s, allow_embedded_null, plus_is_space);
}
std::string percent_decode_s(std::wstring_view const& s, bool allow_embedded_null, bool plus_is_space)
{
return percent_decode_impl<std::string>(s, allow_embedded_null, plus_is_space);
}
}
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