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trying to debug, additional rewrites

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Ondřej Novák 2025-01-26 21:36:03 +01:00
parent 378b5586ab
commit 42f780a729
87 changed files with 1771 additions and 529 deletions
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174
libs/base64.h Normal file
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@ -0,0 +1,174 @@
#pragma once
#include <iterator>
class base64_t {
public:
constexpr base64_t(const char *charset, char terminator):_terminator(terminator) {
for (int i = 0; i < 64; ++i) _charset[i] = charset[i];
for (char &c: _charmap) c=-1;
for (unsigned int i = 0; i < 64;++i) {
int c = _charset[i]-32;
_charmap[c] = static_cast<char>(i);
}
}
template<typename InIter, typename OutIter>
constexpr OutIter encode(InIter beg, InIter end, OutIter out) const {
unsigned int remain = 0;
unsigned int accum = 0;
while (beg != end) {
accum = static_cast<unsigned char>(*beg);
++beg;
if (beg == end) {
remain = 2;
break;
}
accum = (accum << 8) | static_cast<unsigned char>(*beg);
++beg;
if (beg == end) {
remain = 1;
break;
}
accum = (accum << 8) | static_cast<unsigned char>(*beg);
++beg;
*out = _charset[accum >> 18];
++out;
*out = _charset[(accum >> 12) & 0x3F];
++out;
*out = _charset[(accum >> 6) & 0x3F];
++out;
*out = _charset[accum & 0x3F];
++out;
accum = 0;
}
switch (remain) {
case 2: *out = _charset[accum >> 2];
++out;
*out = _charset[(accum << 4) & 0x3F];
++out;
if (_terminator) {
*out = _terminator;
++out;
*out = _terminator;
++out;
}
break;
case 1: *out = _charset[accum >> 10];
++out;
*out = _charset[(accum >> 4) & 0x3F];
++out;
*out = _charset[(accum << 2) & 0x3F];
++out;
if (_terminator) {
*out = _terminator;
++out;
}
break;
default:
break;
}
return out;
}
template<typename InIter, typename OutIter>
constexpr OutIter decode(InIter beg, InIter end, OutIter out) const {
unsigned int accum = 0;
unsigned int remain = 0;
char c = 0;
auto load_next = [&]() {
do {
if (beg == end || *beg == _terminator) return false;
auto val = static_cast<unsigned int>(*beg)-32;
++beg;
if (val < 96) {
c = _charmap[val];
if (c != -1) return true;
}
//skip invalid characters
} while (true);
};
while (load_next()) {
accum = c;
if (!load_next()) {
remain = 3;
break;
}
accum = (accum << 6) | c;
if (!load_next()) {
remain = 2;
break;
}
accum = (accum << 6) | c;
if (!load_next()) {
remain = 1;
break;
}
accum = (accum << 6) | c;
*out = static_cast<char>(accum >> 16);
++out;
*out = static_cast<char>((accum >> 8) & 0xFF);
++out;
*out = static_cast<char>(accum & 0xFF);
++out;
}
switch (remain) {
default: break;
case 2: *out = static_cast<char>(accum >> 4);
++out;
break;
case 1:*out = static_cast<char>(accum >> 10);
++out;
*out = static_cast<char>((accum >> 2) & 0xFF);
++out;
break;
}
return out;
}
protected:
char _charset[64] = {};
char _charmap[96] = {};
char _terminator;
};
inline constexpr auto base64 = base64_t{"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",'='};
inline constexpr auto base64url = base64_t{"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_",'\0'};
template<std::size_t N>
class binary_data {
public:
static constexpr std::size_t buff_size = (N+3)*3/4;
constexpr binary_data(const char *txt) {
auto res =base64.decode(txt, txt+N, data);
sz = res - data;
}
constexpr operator std::basic_string_view<unsigned char>() const {
return {data, sz};
}
operator std::string_view() const {
return {reinterpret_cast<const char *>(data), sz};
}
constexpr auto begin() const {return data;}
constexpr auto end() const {return data+sz;}
constexpr std::size_t size() const {return sz;}
protected:
std::size_t sz = 0;
unsigned char data[buff_size]= {};
};
template<std::size_t N>
binary_data(const char (&)[N]) -> binary_data<N>;