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
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
#include "sass.hpp"
#include "base64vlq.hpp"
namespace Sass {
std::string Base64VLQ::encode(const int number) const
{
std::string encoded = "";
int vlq = to_vlq_signed(number);
do {
int digit = vlq & VLQ_BASE_MASK;
vlq >>= VLQ_BASE_SHIFT;
if (vlq > 0) {
digit |= VLQ_CONTINUATION_BIT;
}
encoded += base64_encode(digit);
} while (vlq > 0);
return encoded;
}
char Base64VLQ::base64_encode(const int number) const
{
int index = number;
if (index < 0) index = 0;
if (index > 63) index = 63;
return CHARACTERS[index];
}
int Base64VLQ::to_vlq_signed(const int number) const
{
return (number < 0) ? ((-number) << 1) + 1 : (number << 1) + 0;
}
const char* Base64VLQ::CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
const int Base64VLQ::VLQ_BASE_SHIFT = 5;
const int Base64VLQ::VLQ_BASE = 1 << VLQ_BASE_SHIFT;
const int Base64VLQ::VLQ_BASE_MASK = VLQ_BASE - 1;
const int Base64VLQ::VLQ_CONTINUATION_BIT = VLQ_BASE;
}
|
