124 lines
2.2 KiB
C
124 lines
2.2 KiB
C
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#include "base64.h"
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///===============
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char base64_table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
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///===============
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char* strchr (const char *s, int c)
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{
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do {
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if (*s == c)
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{
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return (char*)s;
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}
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} while (*s++);
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return (0);
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}
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///===============
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int base64_encode(char inp[], char outp[], int len)
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{
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int i, j;
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unsigned char chr[3];
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for (i = 0, j=-1; i < len; i+=3)
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{
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chr[0] = (unsigned char) inp[i];
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if (i < len)
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{
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chr[1] = (unsigned char) inp[i+1];
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chr[2] = (unsigned char) inp[i+2];
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}
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outp[++j] = base64_table[ chr[0]>>2 ];
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outp[++j] = base64_table[ ((chr[0] & 3) << 4) | (chr[1] >> 4) ];
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outp[++j] = base64_table[ ((chr[1] & 15) << 2) | (chr[2] >> 6) ];
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outp[++j] = base64_table[ chr[2] & 63 ];
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}
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switch (len%3)
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{
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case 1:
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outp[j-1] = outp[j] = '=';
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break;
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case 2:
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outp[j] = '=';
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break;
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default:
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break;
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};
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outp[j+1] = '\0';
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return j+1;
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}
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///===============
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int base64_decode(char inp[], char outp[], int len)
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{
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int i, j, k;
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char chr[4];
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for (i = 0, j=-1, k=0; i < len; i+=4)
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{
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chr[0] = strchr(base64_table, inp[i]) - base64_table;
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chr[1] = strchr(base64_table, inp[i+1]) - base64_table;
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if (inp[i+2] == '=')
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{
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chr[2] = 0;
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k++;
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}
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else
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chr[2] = strchr(base64_table, inp[i+2]) - base64_table;
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if (inp[i+3] == '=')
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{
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chr[3] = 0;
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k++;
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}
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else
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chr[3] = strchr(base64_table, inp[i+3]) - base64_table;
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outp[++j] = ((chr[0] << 2) | (chr[1] >> 4));
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outp[++j] = ((chr[1] << 4) | (chr[2] >> 2));
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outp[++j] = ((chr[2] & 0x03 )<< 6) | (chr[3] & 0x3f);
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}
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outp[j+1-k] = '\0';
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return j+1-k;
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}
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///===============
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#define NULL ((void*)0)
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typedef struct
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{
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void *name;
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void *function;
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} export_t;
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char szbase64_encode[]={"base64_encode"};
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char szbase64_decode[]={"base64_decode"};
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export_t EXPORTS[] =
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{
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{szbase64_encode, (void*) base64_encode},
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{szbase64_decode, (void*) base64_decode},
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{ NULL, NULL },
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};
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///===============
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