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https://github.com/KolibriOS/kolibrios.git
synced 2024-12-14 02:47:07 +03:00
60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
/* Author: PaulCodeman
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Example:
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char bufferb64[0x1000] = {0};
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base64_encode("Kevin van Zonneveld",#bufferb64, 19);
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#bufferb64 == "S2V2aW4gdmFuIFpvbm5ldmVsZA=="
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*/
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:dword b64_symbols = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
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inline void base64_encode(dword data, buffer, length)
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{
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byte o1 = 0;
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byte o2 = 0;
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byte o3 = 0;
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dword bits = 0;
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dword h1 = 0;
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dword h2 = 0;
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dword h3 = 0;
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dword h4 = 0;
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dword end = 0;
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end = data+length;
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do
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{
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o1 = DSBYTE[data];data++;
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if (data < end) {o2 = DSBYTE[data];data++;} else o2 = 0;
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if (data < end) {o3 = DSBYTE[data];data++;} else o3 = 0;
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bits = o1<<16;
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bits |= o2<<8;
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bits |= o3;
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h1 = bits>>18 & 0x3f;
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h2 = bits>>12 & 0x3f;
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h3 = bits>>6 & 0x3f;
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h4 = bits & 0x3f;
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DSBYTE[buffer] = DSBYTE[#b64_symbols+h1];buffer++;
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DSBYTE[buffer] = DSBYTE[#b64_symbols+h2];buffer++;
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DSBYTE[buffer] = DSBYTE[#b64_symbols+h3];buffer++;
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DSBYTE[buffer] = DSBYTE[#b64_symbols+h4];buffer++;
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} while(end > data);
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switch(length % 3)
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{
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case 1:
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buffer--;
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DSBYTE[buffer] = '=';
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buffer--;
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DSBYTE[buffer] = '=';
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buffer+=2;
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break;
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case 2:
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buffer--;
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DSBYTE[buffer] = '=';
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buffer++;
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break;
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}
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DSBYTE[buffer] = 0;
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}
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