| 1 | // sass.hpp must go before all system headers to get the |
|---|---|
| 2 | // __EXTENSIONS__ fix on Solaris. |
| 3 | #include "sass.hpp" |
| 4 | |
| 5 | #include "base64vlq.hpp" |
| 6 | |
| 7 | namespace Sass { |
| 8 | |
| 9 | sass::string Base64VLQ::encode(const int number) const |
| 10 | { |
| 11 | sass::string encoded = ""; |
| 12 | |
| 13 | int vlq = to_vlq_signed(number); |
| 14 | |
| 15 | do { |
| 16 | int digit = vlq & VLQ_BASE_MASK; |
| 17 | vlq >>= VLQ_BASE_SHIFT; |
| 18 | if (vlq > 0) { |
| 19 | digit |= VLQ_CONTINUATION_BIT; |
| 20 | } |
| 21 | encoded += base64_encode(number: digit); |
| 22 | } while (vlq > 0); |
| 23 | |
| 24 | return encoded; |
| 25 | } |
| 26 | |
| 27 | char Base64VLQ::base64_encode(const int number) const |
| 28 | { |
| 29 | int index = number; |
| 30 | if (index < 0) index = 0; |
| 31 | if (index > 63) index = 63; |
| 32 | return CHARACTERS[index]; |
| 33 | } |
| 34 | |
| 35 | int Base64VLQ::to_vlq_signed(const int number) const |
| 36 | { |
| 37 | return (number < 0) ? ((-number) << 1) + 1 : (number << 1) + 0; |
| 38 | } |
| 39 | |
| 40 | const char* Base64VLQ::CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
| 41 | |
| 42 | const int Base64VLQ::VLQ_BASE_SHIFT = 5; |
| 43 | const int Base64VLQ::VLQ_BASE = 1 << VLQ_BASE_SHIFT; |
| 44 | const int Base64VLQ::VLQ_BASE_MASK = VLQ_BASE - 1; |
| 45 | const int Base64VLQ::VLQ_CONTINUATION_BIT = VLQ_BASE; |
| 46 | |
| 47 | } |
| 48 |