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| #include <stdio.h>
| #include <stdlib.h>
| #include <algorithm>
|
| #include "base64.h"
| namespace license {
| using namespace std;
|
| const static char* b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
| // maps A=>0,B=>1..
| const static unsigned char unb64[] = {
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 10
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 20
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 30
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 40
| 0, 0, 0, 62, 0, 0, 0, 63, 52, 53, // 50
| 54, 55, 56, 57, 58, 59, 60, 61, 0, 0, // 60
| 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, // 70
| 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 80
| 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, // 90
| 25, 0, 0, 0, 0, 0, 0, 26, 27, 28, // 100
| 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // 110
| 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, // 120
| 49, 50, 51, 0, 0, 0, 0, 0, 0, 0, // 130
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 140
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 150
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 160
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 170
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 180
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 190
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 200
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 210
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 220
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 230
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 240
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 250
| 0, 0, 0, 0, 0, 0,
| }; // This array has 255 elements
|
| // review api
| static void add_CR_if_needed(string& encodeBuffer, int lineLenght) {
| if (lineLenght > 0 && ((encodeBuffer.size() + 1) % lineLenght) == 0) {
| encodeBuffer += '\n';
| }
| }
|
| string base64(const void* binaryData, size_t len, int lineLenght) {
| const unsigned char* bin = (const unsigned char*)binaryData;
|
| // int rc = 0; // result counter
| unsigned int byteNo; // I need this after the loop
|
| int modulusLen = len % 3;
| int pad = ((modulusLen & 1) << 1) + ((modulusLen & 2) >> 1); // 2 gives 1 and 1 gives 2, but 0 gives 0.
|
| const size_t flen = 4 * (len + pad) / 3;
| size_t totalLength = flen;
| if (lineLenght > 0) {
| totalLength += ((int)flen / lineLenght) + 3;
| }
|
| string encodeBuffer;
| encodeBuffer.reserve(totalLength);
|
| for (byteNo = 0; byteNo <= len - 3; byteNo += 3) {
| unsigned char BYTE0 = bin[byteNo];
| unsigned char BYTE1 = bin[byteNo + 1];
| unsigned char BYTE2 = bin[byteNo + 2];
|
| add_CR_if_needed(encodeBuffer, lineLenght);
| encodeBuffer += b64[BYTE0 >> 2];
| add_CR_if_needed(encodeBuffer, lineLenght);
| encodeBuffer += b64[((0x3 & BYTE0) << 4) + (BYTE1 >> 4)];
| add_CR_if_needed(encodeBuffer, lineLenght);
| encodeBuffer += b64[((0x0f & BYTE1) << 2) + (BYTE2 >> 6)];
| add_CR_if_needed(encodeBuffer, lineLenght);
| encodeBuffer += b64[0x3f & BYTE2];
| }
|
| if (pad == 2) {
| add_CR_if_needed(encodeBuffer, lineLenght);
| encodeBuffer += b64[bin[byteNo] >> 2];
| add_CR_if_needed(encodeBuffer, lineLenght);
| encodeBuffer += b64[(0x3 & bin[byteNo]) << 4];
| add_CR_if_needed(encodeBuffer, lineLenght);
| encodeBuffer += '=';
| add_CR_if_needed(encodeBuffer, lineLenght);
| encodeBuffer += '=';
| } else if (pad == 1) {
| add_CR_if_needed(encodeBuffer, lineLenght);
| encodeBuffer += b64[bin[byteNo] >> 2];
| add_CR_if_needed(encodeBuffer, lineLenght);
| encodeBuffer += b64[((0x3 & bin[byteNo]) << 4) + (bin[byteNo + 1] >> 4)];
| add_CR_if_needed(encodeBuffer, lineLenght);
| encodeBuffer += b64[(0x0f & bin[byteNo + 1]) << 2];
| add_CR_if_needed(encodeBuffer, lineLenght);
| encodeBuffer += '=';
| }
| if (lineLenght && encodeBuffer[encodeBuffer.length() - 1] != '\n') {
| encodeBuffer += '\n';
| }
| return encodeBuffer;
| }
|
| std::vector<uint8_t> unbase64(const std::string& base64_data) {
| string tmp_str(base64_data);
| tmp_str.erase(std::remove(tmp_str.begin(), tmp_str.end(), '\n'), tmp_str.end());
| const unsigned char* safeAsciiPtr = (const unsigned char*)tmp_str.c_str();
| std::vector<uint8_t> bin;
| // int cb = 0;
| unsigned int charNo;
| int pad = 0;
| size_t len = tmp_str.size();
|
| if (len < 2) { // 2 accesses below would be OOB.
| // catch empty string, return NULL as result.
| puts("ERROR: You passed an invalid base64 string (too short). You get NULL back.");
| return bin;
| }
| if (safeAsciiPtr[len - 1] == '=') ++pad;
| if (safeAsciiPtr[len - 2] == '=') ++pad;
|
| size_t flen = 3 * len / 4 - pad;
| bin.reserve(flen);
|
| for (charNo = 0; charNo <= len - 4 - pad; charNo += 4) {
| int A = unb64[safeAsciiPtr[charNo]];
| int B = unb64[safeAsciiPtr[charNo + 1]];
| int C = unb64[safeAsciiPtr[charNo + 2]];
| int D = unb64[safeAsciiPtr[charNo + 3]];
|
| bin.push_back((A << 2) | (B >> 4));
| bin.push_back((B << 4) | (C >> 2));
| bin.push_back((C << 6) | (D));
| }
|
| if (pad == 1) {
| int A = unb64[safeAsciiPtr[charNo]];
| int B = unb64[safeAsciiPtr[charNo + 1]];
| int C = unb64[safeAsciiPtr[charNo + 2]];
| bin.push_back((A << 2) | (B >> 4));
| bin.push_back((B << 4) | (C >> 2));
| } else if (pad == 2) {
| int A = unb64[safeAsciiPtr[charNo]];
| int B = unb64[safeAsciiPtr[charNo + 1]];
| bin.push_back((A << 2) | (B >> 4));
| }
|
| return bin;
| }
|
| } // namespace license
|
|
