From ef7df8048d1067d3148287f27af9047743f1e2ae Mon Sep 17 00:00:00 2001
From: gcontini <1121667+gcontini@users.noreply.github.com>
Date: 周日, 15 3月 2020 16:26:21 +0800
Subject: [PATCH] Merge branch 'feature/pc_identifiers' into develop issues #2 #3 #14 #49
---
src/library/base/base64.cpp | 153 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 153 insertions(+), 0 deletions(-)
diff --git a/src/library/base/base64.cpp b/src/library/base/base64.cpp
new file mode 100644
index 0000000..f508d4a
--- /dev/null
+++ b/src/library/base/base64.cpp
@@ -0,0 +1,153 @@
+#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
+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
+ 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;
+ 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
--
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