109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
#ifndef _WDL_BASE64_H_
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#define _WDL_BASE64_H_
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#ifndef WDL_BASE64_FUNCDECL
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#define WDL_BASE64_FUNCDECL static
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#endif
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static const char wdl_base64_alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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WDL_BASE64_FUNCDECL void wdl_base64encode(const unsigned char *in, char *out, int len)
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{
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while (len >= 6)
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{
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const int accum = (in[0] << 16) + (in[1] << 8) + in[2];
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const int accum2 = (in[3] << 16) + (in[4] << 8) + in[5];
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out[0] = wdl_base64_alphabet[(accum >> 18) & 0x3F];
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out[1] = wdl_base64_alphabet[(accum >> 12) & 0x3F];
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out[2] = wdl_base64_alphabet[(accum >> 6) & 0x3F];
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out[3] = wdl_base64_alphabet[accum & 0x3F];
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out[4] = wdl_base64_alphabet[(accum2 >> 18) & 0x3F];
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out[5] = wdl_base64_alphabet[(accum2 >> 12) & 0x3F];
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out[6] = wdl_base64_alphabet[(accum2 >> 6) & 0x3F];
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out[7] = wdl_base64_alphabet[accum2 & 0x3F];
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out+=8;
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in+=6;
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len-=6;
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}
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if (len >= 3)
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{
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const int accum = (in[0]<<16)|(in[1]<<8)|in[2];
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out[0] = wdl_base64_alphabet[(accum >> 18) & 0x3F];
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out[1] = wdl_base64_alphabet[(accum >> 12) & 0x3F];
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out[2] = wdl_base64_alphabet[(accum >> 6) & 0x3F];
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out[3] = wdl_base64_alphabet[accum & 0x3F];
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in+=3;
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len-=3;
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out+=4;
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}
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if (len>0)
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{
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if (len == 2)
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{
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const int accum = (in[0] << 8) | in[1];
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out[0] = wdl_base64_alphabet[(accum >> 10) & 0x3F];
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out[1] = wdl_base64_alphabet[(accum >> 4) & 0x3F];
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out[2] = wdl_base64_alphabet[(accum & 0xF)<<2];
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}
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else
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{
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const int accum = in[0];
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out[0] = wdl_base64_alphabet[(accum >> 2) & 0x3F];
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out[1] = wdl_base64_alphabet[(accum & 0x3)<<4];
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out[2]='=';
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}
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out[3]='=';
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out+=4;
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}
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out[0]=0;
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}
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WDL_BASE64_FUNCDECL int wdl_base64decode(const char *src, unsigned char *dest, int destsize)
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{
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static const char *tab = // poolable string
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"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
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"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
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"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x3e\xff\xff\xff\x3f"
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"\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\xff\xff\xff\xff\xff\xff"
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"\xff\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e"
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"\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\xff\xff\xff\xff\xff"
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"\xff\x1a\x1b\x1c\x1d\x1e\x1f\x20\x21\x22\x23\x24\x25\x26\x27\x28"
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"\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30\x31\x32\x33\xff\xff\xff\xff\xff"
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"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
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"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
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"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
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"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
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"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
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"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
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"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
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"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff";
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unsigned int accum=0;
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int nbits=0, wpos=0;
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if (destsize <= 0) return 0;
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for (;;)
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{
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const int v=(int)tab[*(unsigned char *)src++];
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if (v<0) return wpos;
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accum += v;
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nbits += 6;
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if (nbits >= 8)
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{
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nbits-=8;
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dest[wpos] = (accum>>nbits)&0xff;
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if (++wpos >= destsize) return wpos;
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}
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accum <<= 6;
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}
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}
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#endif
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