127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
#include <stdio.h>
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#include "base64.h"
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/* BASE 64 encode table */
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static const char base64en[] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
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'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
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'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
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'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
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'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
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'w', 'x', 'y', 'z', '0', '1', '2', '3',
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'4', '5', '6', '7', '8', '9', '+', '/',
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};
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#define BASE64_PAD '='
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#define BASE64DE_FIRST '+'
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#define BASE64DE_LAST 'z'
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/* ASCII order for BASE 64 decode, -1 in unused character */
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static const signed char base64de[] = {
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/* '+', ',', '-', '.', '/', '0', '1', '2', */
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62, -1, -1, -1, 63, 52, 53, 54,
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/* '3', '4', '5', '6', '7', '8', '9', ':', */
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55, 56, 57, 58, 59, 60, 61, -1,
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/* ';', '<', '=', '>', '?', '@', 'A', 'B', */
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-1, -1, -1, -1, -1, -1, 0, 1,
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/* 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', */
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2, 3, 4, 5, 6, 7, 8, 9,
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/* 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', */
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10, 11, 12, 13, 14, 15, 16, 17,
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/* 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', */
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18, 19, 20, 21, 22, 23, 24, 25,
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/* '[', '\', ']', '^', '_', '`', 'a', 'b', */
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-1, -1, -1, -1, -1, -1, 26, 27,
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/* 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', */
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28, 29, 30, 31, 32, 33, 34, 35,
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/* 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', */
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36, 37, 38, 39, 40, 41, 42, 43,
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/* 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', */
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44, 45, 46, 47, 48, 49, 50, 51,
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};
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int hv_base64_encode(const unsigned char *in, unsigned int inlen, char *out) {
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unsigned int i = 0, j = 0;
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for (; i < inlen; i++) {
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int s = i % 3;
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switch (s) {
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case 0:
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out[j++] = base64en[(in[i] >> 2) & 0x3F];
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continue;
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case 1:
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out[j++] = base64en[((in[i-1] & 0x3) << 4) + ((in[i] >> 4) & 0xF)];
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continue;
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case 2:
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out[j++] = base64en[((in[i-1] & 0xF) << 2) + ((in[i] >> 6) & 0x3)];
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out[j++] = base64en[in[i] & 0x3F];
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}
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}
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/* move back */
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i -= 1;
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/* check the last and add padding */
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if ((i % 3) == 0) {
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out[j++] = base64en[(in[i] & 0x3) << 4];
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out[j++] = BASE64_PAD;
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out[j++] = BASE64_PAD;
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} else if ((i % 3) == 1) {
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out[j++] = base64en[(in[i] & 0xF) << 2];
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out[j++] = BASE64_PAD;
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}
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return j;
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}
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int hv_base64_decode(const char *in, unsigned int inlen, unsigned char *out) {
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unsigned int i = 0, j = 0;
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for (; i < inlen; i++) {
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int c;
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int s = i % 4;
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if (in[i] == '=')
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return j;
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if (in[i] < BASE64DE_FIRST || in[i] > BASE64DE_LAST ||
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(c = base64de[in[i] - BASE64DE_FIRST]) == -1)
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return -1;
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switch (s) {
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case 0:
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out[j] = ((unsigned int)c << 2) & 0xFF;
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continue;
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case 1:
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out[j++] += ((unsigned int)c >> 4) & 0x3;
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/* if not last char with padding */
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if (i < (inlen - 3) || in[inlen - 2] != '=')
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out[j] = ((unsigned int)c & 0xF) << 4;
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continue;
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case 2:
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out[j++] += ((unsigned int)c >> 2) & 0xF;
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/* if not last char with padding */
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if (i < (inlen - 2) || in[inlen - 1] != '=')
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out[j] = ((unsigned int)c & 0x3) << 6;
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continue;
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case 3:
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out[j++] += (unsigned char)c;
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}
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}
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return j;
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}
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