new version "(16) Kreuz Köln Ost": #close JSON-12. remove dependency to awkward boost.archive for base64.
parent
12793cf92c
commit
3a138e06d6
@ -0,0 +1,133 @@
|
||||
#include "base64.hh"
|
||||
#include <stdint.h>
|
||||
#include <stdexcept>
|
||||
|
||||
namespace
|
||||
{
|
||||
|
||||
#define __ (-1) // invalid char -> exception!
|
||||
#define SP (-2) // space char -> ignore
|
||||
#define EQ (-3) // '=' char -> special handling of EOF
|
||||
|
||||
const char* const b64c = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
||||
|
||||
const int8_t values[256] = {
|
||||
// 1 2 3 4 5 6 7 8 9 A B C D E F
|
||||
__, __, __, __, __, __, __, __, __, SP, SP, __, SP, SP, __, __, // 0x00 .. 0x0F
|
||||
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 0x10 .. 0x1F
|
||||
SP, __, __, __, __, __, __, __, __, __, __, 62, __, __, __, 63, // 0x20 .. 0x2F
|
||||
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, __, __, __, EQ, __, __, // 0x30 .. 0x3F 0x3D = '='
|
||||
__, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 0x40 .. 0x4F
|
||||
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, __, __, __, __, __, // 0x50 .. 0x5F
|
||||
__, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, // 0x60 .. 0x6F
|
||||
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, __, __, __, __, __, // 0x70 .. 0x7F
|
||||
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 0x80 .. 0x8F
|
||||
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 0x90 .. 0x9F
|
||||
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 0xA0 .. 0xAF
|
||||
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 0xB0 .. 0xBF
|
||||
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 0xC0 .. 0xCF
|
||||
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 0xD0 .. 0xDF
|
||||
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 0xE0 .. 0xEF
|
||||
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 0xF0 .. 0xFF
|
||||
};
|
||||
|
||||
struct IllegalCharacter
|
||||
{
|
||||
char c;
|
||||
};
|
||||
|
||||
unsigned fetch(const char*& s, const char* end)
|
||||
{
|
||||
while( s < end)
|
||||
{
|
||||
const int8_t sc = values[ uint8_t(*s) ];
|
||||
if(sc==-1) throw IllegalCharacter{*s};
|
||||
++s;
|
||||
if(sc>=0)
|
||||
{
|
||||
return uint8_t(sc);
|
||||
}else{
|
||||
if(sc==EQ) { return 255; }
|
||||
}
|
||||
}
|
||||
|
||||
return 255;
|
||||
}
|
||||
|
||||
} // end of anonymous namespace
|
||||
|
||||
|
||||
// decodes base64-encoded 'input', skip whitespaces, throw if illegal character found in string
|
||||
std::string base64_decode(const std::string& input)
|
||||
try{
|
||||
std::string ret;
|
||||
ret.reserve( (input.size()+3)/4 * 3 );
|
||||
|
||||
const char* c = input.data();
|
||||
const char* const end = c + input.size();
|
||||
|
||||
uint8_t u0, u1, u2, u3=0;
|
||||
|
||||
while(c < end)
|
||||
{
|
||||
u0 = fetch(c,end);
|
||||
u1 = fetch(c,end);
|
||||
u2 = fetch(c,end);
|
||||
u3 = fetch(c,end);
|
||||
|
||||
if(u1!=255) { ret += char( (u0 << 2) | (u1 >> 4) ); }
|
||||
if(u2!=255) { ret += char( (u1 << 4) | (u2 >> 2) ); }
|
||||
if(u3!=255) { ret += char( (u2 << 6) | (u3 ) ); }
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
catch(const IllegalCharacter& ic)
|
||||
{
|
||||
throw std::runtime_error("Illegal character (" + std::to_string( int(ic.c) ) + ") in base64-encoded string \"" + input + "\"" );
|
||||
}
|
||||
|
||||
|
||||
std::string base64_encode(const std::string& input)
|
||||
{
|
||||
typedef uint8_t U8;
|
||||
|
||||
std::string ret;
|
||||
ret.reserve( (input.size()+2)/3 * 4 );
|
||||
|
||||
const unsigned triples = input.size()/3;
|
||||
const char* s = input.data();
|
||||
for(unsigned q=0; q<triples; ++q, s+=3)
|
||||
{
|
||||
const uint32_t u = U8(s[0])*65536 + U8(s[1])*256 + U8(s[2]);
|
||||
ret += b64c[ (u>>18) & 63 ];
|
||||
ret += b64c[ (u>>12) & 63 ];
|
||||
ret += b64c[ (u>> 6) & 63 ];
|
||||
ret += b64c[ (u ) & 63 ];
|
||||
}
|
||||
|
||||
switch(input.size() - triples*3)
|
||||
{
|
||||
case 2 :
|
||||
{
|
||||
const uint32_t u = U8(s[0])*65536 + U8(s[1])*256;
|
||||
ret += b64c[ (u>>18) & 63 ];
|
||||
ret += b64c[ (u>>12) & 63 ];
|
||||
ret += b64c[ (u>> 6) & 63 ];
|
||||
ret += '=';
|
||||
return ret;
|
||||
}
|
||||
|
||||
case 1 :
|
||||
{
|
||||
const uint32_t u = U8(s[0])*65536;
|
||||
ret += b64c[ (u>>18) & 63 ];
|
||||
ret += b64c[ (u>>12) & 63 ];
|
||||
ret += '=';
|
||||
ret += '=';
|
||||
return ret;
|
||||
}
|
||||
case 0: return ret;
|
||||
default : throw std::logic_error("Internal error in base64_encode()!");
|
||||
}
|
||||
}
|
@ -0,0 +1,12 @@
|
||||
#ifndef JSON_ADAPTER_BASE64_HH
|
||||
#define JSON_ADAPTER_BASE64_HH
|
||||
|
||||
#include <string>
|
||||
|
||||
// decodes base64-encoded 'input', skip whitespaces, throw std::runtime_error if an illegal character found in string
|
||||
std::string base64_decode(const std::string& input);
|
||||
|
||||
// encodes base64-encoded 'input', without any whitespaces nor linebreaks
|
||||
std::string base64_encode(const std::string& input);
|
||||
|
||||
#endif // JSON_ADAPTER_BASE64_HH
|
Loading…
Reference in New Issue