66 lines
1.8 KiB
C++
66 lines
1.8 KiB
C++
#include "Utility/Base64.h"
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#include <algorithm>
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namespace {
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// OFFSET: 0x0061AD10
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// FUNCTION: fn_04416
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unsigned Position(unsigned char value) {
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if (value >= 'A' && value <= 'Z') {
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return value - 'A';
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}
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if (value >= 'a' && value <= 'z') {
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return value - 'a' + 26;
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}
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if (value >= '0' && value <= '9') {
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return value - '0' + 52;
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}
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if (value == '+' || value == '-') {
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return 62;
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}
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if (value == '/' || value == '_') {
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return 63;
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}
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return value;
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}
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}
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// OFFSET: 0x0061AB10
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// FUNCTION: fn_04415
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std::string InsertLinebreaks(std::string text, unsigned int distance) {
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if (text.empty()) {
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return {};
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}
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for (unsigned int pos = distance; pos < text.size(); pos += distance + 1) {
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text.insert(pos, "\n", 1);
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}
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return text;
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}
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// OFFSET: 0x006195C0
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// FUNCTION: fn_04411
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std::string DecodeBase64(std::string encoded, bool removeLinebreaks) {
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if (encoded.empty()) {
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return {};
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}
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if (removeLinebreaks) {
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encoded.erase(std::remove(encoded.begin(), encoded.end(), '\n'), encoded.end());
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return DecodeBase64(encoded, false);
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}
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std::string decoded;
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decoded.reserve(encoded.size() / 4 * 3);
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for (std::size_t pos = 0; pos < encoded.size(); pos += 4) {
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unsigned second = Position(encoded[pos + 1]);
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decoded.push_back(static_cast<char>((Position(encoded[pos]) << 2) + ((second >> 4) & 3)));
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if (pos + 2 < encoded.size() && encoded[pos + 2] != '=' && encoded[pos + 2] != '.') {
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unsigned third = Position(encoded[pos + 2]);
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decoded.push_back(static_cast<char>((second << 4) ^ ((third >> 2) & 15)));
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if (pos + 3 < encoded.size() && encoded[pos + 3] != '=' && encoded[pos + 3] != '.') {
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decoded.push_back(static_cast<char>((third << 6) + Position(encoded[pos + 3])));
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}
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}
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}
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return decoded;
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}
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