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Refactored the base64 binary to its own space with a unified class that (will) be used for parsing (in addition to emitting)

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Jesse Beder
2012-01-21 01:18:37 -06:00
parent e145488547
commit 6105d4cfeb
7 changed files with 148 additions and 49 deletions
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90
src/binary.cpp Normal file
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#include "yaml-cpp/binary.h"
#include "yaml-cpp/ostream.h"
namespace YAML
{
static const char encoding[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
void WriteBase64(ostream& out, const unsigned char *data, std::size_t size)
{
const char PAD = '=';
out << "\"";
std::size_t chunks = size / 3;
std::size_t remainder = size % 3;
for(std::size_t i=0;i<chunks;i++, data += 3) {
out << encoding[data[0] >> 2];
out << encoding[((data[0] & 0x3) << 4) | (data[1] >> 4)];
out << encoding[((data[1] & 0xf) << 2) | (data[2] >> 6)];
out << encoding[data[2] & 0x3f];
}
switch(remainder) {
case 0:
break;
case 1:
out << encoding[data[0] >> 2];
out << encoding[((data[0] & 0x3) << 4)];
out << PAD;
out << PAD;
break;
case 2:
out << encoding[data[0] >> 2];
out << encoding[((data[0] & 0x3) << 4) | (data[1] >> 4)];
out << encoding[((data[1] & 0xf) << 2)];
out << PAD;
break;
}
out << "\"";
}
static const unsigned char decoding[] = {
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255, 62,255,255,255, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61,255,255,255, 0,255,255,
255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,255,255,255,255,255,
255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
};
std::vector<unsigned char> ReadBase64(const std::string& input)
{
typedef std::vector<unsigned char> ret_type;
if(input.empty())
return ret_type();
ret_type ret(3 * input.size() / 4 + 1);
unsigned char *out = &ret[0];
unsigned value = 0;
for(std::size_t i=0;i<input.size();i++) {
unsigned char d = decoding[static_cast<unsigned>(input[i])];
if(d == 255)
return ret_type();
value = (value << 6) | d;
if(i % 4 == 3) {
*out++ = value >> 16;
if(i > 0 && input[i - 1] != '=')
*out++ = value >> 8;
if(input[i] != '=')
*out++ = value;
}
}
ret.resize(out - &ret[0]);
return ret;
}
}