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updated base64

This commit is contained in:
mrbesen 2020-10-05 14:18:07 +02:00
parent ddbe2f089e
commit fe6e8e27c6
Signed by: MrBesen
GPG Key ID: 596B2350DCD67504
2 changed files with 18 additions and 23 deletions
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36
src/util.cpp
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@ -144,8 +144,6 @@ std::string mrbesen::Util::bytesToBase64(char* buffer, unsigned int len) {
if(len == 0) return "";
const uint8_t overlen = len % 3;
const uint8_t len_padding = overlen ? (3 - overlen) : 0; //anzahl benötigter padding chars
size_t len_encoded = (len+2) / 3 * 4;
static const unsigned char trailing_char = '=';
@ -154,30 +152,24 @@ std::string mrbesen::Util::bytesToBase64(char* buffer, unsigned int len) {
std::string ret;
ret.reserve(len_encoded);
char nextb = 0;
for(unsigned int pos = 0; pos < len; pos ++) {
const char c = buffer[pos];
uint8_t tripos = pos % 3; //position im trible
uint8_t maskShift = (1+tripos) << 1; //2, 4, 6
uint8_t mask = 0xff << maskShift;
ret.push_back(base64_chars[((c & mask) >> maskShift) | nextb]);
if(tripos == 2) {
ret.push_back(base64_chars[c & ~mask]);
nextb = 0;
for(unsigned int pos = 0; pos < len; pos += 3) {
ret.push_back(base64_chars[(buffer[pos] & 0xfc) >> 2]);
if (pos+1 < len) {
ret.push_back(base64_chars[((buffer[pos] & 0x03) << 4) + ((buffer[pos + 1] & 0xf0) >> 4)]);
if (pos+2 < len) {
ret.push_back(base64_chars[((buffer[pos + 1] & 0x0f) << 2) + ((buffer[pos + 2] & 0xc0) >> 6)]);
ret.push_back(base64_chars[ buffer[pos + 2] & 0x3f]);
} else {
ret.push_back(base64_chars[(buffer[pos + 1] & 0x0f) << 2]);
ret.push_back(trailing_char);
}
} else {
uint8_t invmaskShift = 6 - maskShift;
nextb = (c & ~mask) << invmaskShift;
ret.push_back(base64_chars[(buffer[pos] & 0x03) << 4]);
ret.push_back(trailing_char);
ret.push_back(trailing_char);
}
}
if(nextb)
ret.push_back(base64_chars[(int) nextb]);
for(uint8_t i = 0; i < len_padding; ++i) {
ret.push_back(trailing_char);
}
return ret;
}

5
tests/utilstest.cpp
View File

@ -171,7 +171,7 @@ int testUtil_trim() {
}
int testUtil_base() {
char buf[] {0, (char) 0xAB, (char) 0x12, (char) 0xCD, (char) 0x34};
char buf[] {0, (char) 0xAB, (char) 0x12, (char) 0xCD, (char) 0x34, (char) 0xFF};
std::string ret = bytesToBase16(buf, 5);
ASSERT(ret == "00ab12cd34", ret);
@ -188,5 +188,8 @@ int testUtil_base() {
ret = bytesToBase64(buf, 0);
ASSERT(ret == "", ret);
ret = bytesToBase64(buf, 6);
ASSERT(ret == "AKsSzTT_", ret);
return TESTGOOD;
}