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/* This is a public domain base64 implementation written by WEI Zhicheng. */
#include "base64.h"
#define BASE64_PAD '='
#define BASE64DE_FIRST '+'
#define BASE64DE_LAST 'z'
/* BASE 64 encode table */
static const char base64en[] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3',
'4', '5', '6', '7', '8', '9', '+', '/',
};
/* ASCII order for BASE 64 decode, 255 in unused character */
static const unsigned char base64de[] = {
/* nul, soh, stx, etx, eot, enq, ack, bel, */
255, 255, 255, 255, 255, 255, 255, 255,
/* bs, ht, nl, vt, np, cr, so, si, */
255, 255, 255, 255, 255, 255, 255, 255,
/* dle, dc1, dc2, dc3, dc4, nak, syn, etb, */
255, 255, 255, 255, 255, 255, 255, 255,
/* can, em, sub, esc, fs, gs, rs, us, */
255, 255, 255, 255, 255, 255, 255, 255,
/* sp, '!', '"', '#', '$', '%', '&', ''', */
255, 255, 255, 255, 255, 255, 255, 255,
/* '(', ')', '*', '+', ',', '-', '.', '/', */
255, 255, 255, 62, 255, 255, 255, 63,
/* '0', '1', '2', '3', '4', '5', '6', '7', */
52, 53, 54, 55, 56, 57, 58, 59,
/* '8', '9', ':', ';', '<', '=', '>', '?', */
60, 61, 255, 255, 255, 255, 255, 255,
/* '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G', */
255, 0, 1, 2, 3, 4, 5, 6,
/* 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', */
7, 8, 9, 10, 11, 12, 13, 14,
/* 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', */
15, 16, 17, 18, 19, 20, 21, 22,
/* 'X', 'Y', 'Z', '[', '\', ']', '^', '_', */
23, 24, 25, 255, 255, 255, 255, 255,
/* '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', */
255, 26, 27, 28, 29, 30, 31, 32,
/* 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', */
33, 34, 35, 36, 37, 38, 39, 40,
/* 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', */
41, 42, 43, 44, 45, 46, 47, 48,
/* 'x', 'y', 'z', '{', '|', '}', '~', del, */
49, 50, 51, 255, 255, 255, 255, 255
};
unsigned int
base64_encode(const unsigned char *in, unsigned int inlen, char *out)
{
int s;
unsigned int i;
unsigned int j;
unsigned char c;
unsigned char l;
s = 0;
l = 0;
for (i = j = 0; i < inlen; i++) {
c = in[i];
switch (s) {
case 0:
s = 1;
out[j++] = base64en[(c >> 2) & 0x3F];
break;
case 1:
s = 2;
out[j++] = base64en[((l & 0x3) << 4) | ((c >> 4) & 0xF)];
break;
case 2:
s = 0;
out[j++] = base64en[((l & 0xF) << 2) | ((c >> 6) & 0x3)];
out[j++] = base64en[c & 0x3F];
break;
}
l = c;
}
switch (s) {
case 1:
out[j++] = base64en[(l & 0x3) << 4];
out[j++] = BASE64_PAD;
out[j++] = BASE64_PAD;
break;
case 2:
out[j++] = base64en[(l & 0xF) << 2];
out[j++] = BASE64_PAD;
break;
}
out[j] = 0;
return j;
}
unsigned int
base64_decode(const char *in, unsigned int inlen, unsigned char *out)
{
unsigned int i;
unsigned int j;
unsigned char c;
if (inlen & 0x3) {
/* We sanitize the input to where this never gets hit */
return 0; // LCOV_EXCL_LINE
}
for (i = j = 0; i < inlen; i++) {
if (in[i] == BASE64_PAD) {
break;
}
if (in[i] < BASE64DE_FIRST || in[i] > BASE64DE_LAST) {
return 0;
}
c = base64de[(unsigned char)in[i]];
if (c == 255) {
return 0;
}
switch (i & 0x3) {
case 0:
out[j] = (c << 2) & 0xFF;
break;
case 1:
out[j++] |= (c >> 4) & 0x3;
out[j] = (c & 0xF) << 4;
break;
case 2:
out[j++] |= (c >> 2) & 0xF;
out[j] = (c & 0x3) << 6;
break;
case 3:
out[j++] |= c;
break;
}
}
return j;
}
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