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114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
#include "base64.h"
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#include <stdexcept>
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namespace minitts::app {
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namespace {
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constexpr char kAlphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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int decode_char(char c) {
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if (c >= 'A' && c <= 'Z') {
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return c - 'A';
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}
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if (c >= 'a' && c <= 'z') {
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return c - 'a' + 26;
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}
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if (c >= '0' && c <= '9') {
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return c - '0' + 52;
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}
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if (c == '+') {
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return 62;
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}
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if (c == '/') {
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return 63;
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}
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return -1;
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}
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} // namespace
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std::string base64_encode(const uint8_t * data, size_t size) {
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std::string out;
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out.reserve(((size + 2) / 3) * 4);
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for (size_t i = 0; i < size; i += 3) {
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const uint32_t b0 = data[i];
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const uint32_t b1 = i + 1 < size ? data[i + 1] : 0;
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const uint32_t b2 = i + 2 < size ? data[i + 2] : 0;
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const uint32_t chunk = (b0 << 16) | (b1 << 8) | b2;
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out.push_back(kAlphabet[(chunk >> 18) & 0x3f]);
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out.push_back(kAlphabet[(chunk >> 12) & 0x3f]);
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out.push_back(i + 1 < size ? kAlphabet[(chunk >> 6) & 0x3f] : '=');
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out.push_back(i + 2 < size ? kAlphabet[chunk & 0x3f] : '=');
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}
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return out;
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}
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std::string base64_encode(const std::vector<uint8_t> & bytes) {
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return base64_encode(bytes.data(), bytes.size());
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}
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std::string base64_encode(const std::vector<std::byte> & bytes) {
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return base64_encode(reinterpret_cast<const uint8_t *>(bytes.data()), bytes.size());
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}
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namespace {
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template <typename Byte>
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std::vector<Byte> decode(std::string_view input) {
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if (input.rfind("data:", 0) == 0) {
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const auto comma = input.find(',');
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if (comma == std::string_view::npos || input.find(";base64") == std::string_view::npos) {
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throw std::runtime_error("malformed base64 data URI");
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}
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input = input.substr(comma + 1);
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}
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std::vector<Byte> out;
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out.reserve((input.size() / 4) * 3);
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uint32_t buffer = 0;
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int bits = 0;
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int padding = 0;
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for (const char c : input) {
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if (c == ' ' || c == '\t' || c == '\r' || c == '\n') {
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continue;
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}
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if (c == '=') {
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++padding;
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if (padding > 2) {
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throw std::runtime_error("malformed base64 payload: excess padding");
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}
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continue;
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}
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if (padding > 0) {
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throw std::runtime_error("malformed base64 payload: data after padding");
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}
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const int value = decode_char(c);
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if (value < 0) {
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throw std::runtime_error("malformed base64 payload: invalid character");
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}
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buffer = (buffer << 6) | static_cast<uint32_t>(value);
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bits += 6;
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if (bits >= 8) {
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bits -= 8;
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out.push_back(static_cast<Byte>((buffer >> bits) & 0xff));
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}
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}
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if (bits >= 6) {
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throw std::runtime_error("malformed base64 payload: truncated quartet");
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}
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return out;
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}
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} // namespace
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std::vector<uint8_t> base64_decode(std::string_view input) {
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return decode<uint8_t>(input);
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}
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std::vector<std::byte> base64_decode_bytes(std::string_view input) {
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return decode<std::byte>(input);
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}
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} // namespace minitts::app
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