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44 lines
1.0 KiB
44 lines
1.0 KiB
#include "sass.hpp"
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#include "base64vlq.hpp"
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namespace Sass {
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std::string Base64VLQ::encode(const int number) const
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{
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std::string encoded = "";
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int vlq = to_vlq_signed(number);
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do {
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int digit = vlq & VLQ_BASE_MASK;
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vlq >>= VLQ_BASE_SHIFT;
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if (vlq > 0) {
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digit |= VLQ_CONTINUATION_BIT;
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}
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encoded += base64_encode(digit);
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} while (vlq > 0);
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return encoded;
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}
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char Base64VLQ::base64_encode(const int number) const
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{
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int index = number;
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if (index < 0) index = 0;
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if (index > 63) index = 63;
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return CHARACTERS[index];
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}
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int Base64VLQ::to_vlq_signed(const int number) const
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{
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return (number < 0) ? ((-number) << 1) + 1 : (number << 1) + 0;
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}
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const char* Base64VLQ::CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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const int Base64VLQ::VLQ_BASE_SHIFT = 5;
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const int Base64VLQ::VLQ_BASE = 1 << VLQ_BASE_SHIFT;
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const int Base64VLQ::VLQ_BASE_MASK = VLQ_BASE - 1;
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const int Base64VLQ::VLQ_CONTINUATION_BIT = VLQ_BASE;
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}
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