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104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/*
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(c) 2002-2016 by Vladimir Dubrovin <3proxy@3proxy.ru>
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please read License Agreement
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*/
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#include <string.h>
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static const char base64digits[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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#define BAD -1
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static const char base64val[] = {
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BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD,
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BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD,
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BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD, 62, BAD,BAD,BAD, 63,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61,BAD,BAD, BAD,BAD,BAD,BAD,
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BAD, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,BAD, BAD,BAD,BAD,BAD,
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BAD, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
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41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,BAD, BAD,BAD,BAD,BAD
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};
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#define DECODE64(c) ((c > 32 && c<127)? base64val[(int)c] : BAD)
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char* en64 (const char *in, char *out, int inlen)
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{
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for (; inlen > 0; inlen -= 3, in+=3)
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{
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*out++ = base64digits[in[0] >> 2];
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*out++ = base64digits[((in[0]&3)<<4) | ((inlen > 1)?(in[1]>>4):0)];
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*out++ = (inlen > 1)? base64digits[((in[1] << 2) & 0x3c) | ((inlen > 2)? (in[2] >> 6) : 0)]: '=';
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*out++ = (inlen > 2)? base64digits[in[2] & 0x3f] : '=';
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}
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*out = '\0';
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return out;
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}
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int de64 (const char *in, char *out, int maxlen)
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{
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int len = 0;
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register char digit1, digit2, digit3, digit4;
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if (in[0] == '+' && in[1] == ' ')
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in += 2;
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if (*in == '\r')
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return(0);
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do {
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digit1 = in[0];
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if (DECODE64(digit1) == BAD)
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return(-1);
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digit2 = in[1];
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if (DECODE64(digit2) == BAD)
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return(-1);
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digit3 = in[2];
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if (digit3 != '=' && DECODE64(digit3) == BAD)
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return(-1);
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digit4 = in[3];
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if (digit4 != '=' && DECODE64(digit4) == BAD)
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return(-1);
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in += 4;
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*out++ = (DECODE64(digit1) << 2) | (DECODE64(digit2) >> 4);
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++len;
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if (digit3 != '=')
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{
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*out++ = ((DECODE64(digit2) << 4) & 0xf0) | (DECODE64(digit3) >> 2);
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++len;
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if (digit4 != '=')
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{
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*out++ = ((DECODE64(digit3) << 6) & 0xc0) | DECODE64(digit4);
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++len;
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}
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}
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} while
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(*in && *in != '\r' && digit4 != '=' && (maxlen-=4) >= 4);
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return (len);
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}
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char hex[] = "0123456789ABCDEF";
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void tohex(char *in, char *out, int len){
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int i;
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for (i=0; i<len; i++) {
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out[(i<<1)] = hex[(in[i]>>4)];
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out[(i<<1) + 1] = hex[(in[i]&0x0F)];
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}
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out[(i<<1)] = 0;
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}
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void fromhex(char *in, char *out, int len){
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char *c1, *c2;
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for (; len > 0; len--) {
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c1 = strchr((char *)hex, *in++);
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c2 = strchr((char *)hex, *in++);
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if(c1 && c2){
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*out++ = (char)(unsigned char)(((c1 - hex) << 4) + (c2 - hex));
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}
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}
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}
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