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/*
* base64.c -- routines for converting to base64
*
* This code is Copyright (c) 2012, by the authors of nmh. See the
* COPYRIGHT file in the root directory of the nmh distribution for
* complete copyright information.
*/
#include <h/mh.h>
#include <h/mime.h>
static char nib2b64[0x40+1] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int
writeBase64aux (FILE *in, FILE *out, int crlf)
{
unsigned int cc, n;
unsigned char inbuf[3];
int skipnl = 0;
n = BPERLIN;
while ((cc = fread (inbuf, sizeof(*inbuf), sizeof(inbuf), in)) > 0) {
unsigned long bits;
char *bp;
char outbuf[4];
if (cc < sizeof(inbuf)) {
inbuf[2] = 0;
if (cc < sizeof(inbuf) - 1)
inbuf[1] = 0;
}
/*
* Convert a LF to a CRLF if desired. That means we need to push
* data back into the input stream.
*/
if (crlf) {
unsigned int i;
for (i = 0; i < cc; i++) {
if (inbuf[i] == '\n' && !skipnl) {
inbuf[i] = '\r';
/*
* If it's the last character in the buffer, we can just
* substitute a \r and push a \n back. Otherwise shuffle
* everything down and push the last character back.
*/
if (i == cc - 1) {
/*
* If we're at the end of the input, there might be
* more room in inbuf; if so, add it there. Otherwise
* push it back to the input.
*/
if (cc < sizeof(inbuf))
inbuf[cc++] = '\n';
else
ungetc('\n', in);
skipnl = 1;
} else {
/* This only works as long as sizeof(inbuf) == 3 */
ungetc(inbuf[cc - 1], in);
if (cc == 3 && i == 0)
inbuf[2] = inbuf[1];
inbuf[++i] = '\n';
}
} else {
skipnl = 0;
}
}
}
bits = (inbuf[0] & 0xff) << 16;
bits |= (inbuf[1] & 0xff) << 8;
bits |= inbuf[2] & 0xff;
for (bp = outbuf + sizeof(outbuf); bp > outbuf; bits >>= 6)
*--bp = nib2b64[bits & 0x3f];
if (cc < sizeof(inbuf)) {
outbuf[3] = '=';
if (cc < sizeof inbuf - 1)
outbuf[2] = '=';
}
fwrite (outbuf, sizeof(*outbuf), sizeof(outbuf), out);
if (cc < sizeof(inbuf)) {
putc ('\n', out);
return OK;
}
if (--n <= 0) {
n = BPERLIN;
putc ('\n', out);
}
}
if (n != BPERLIN)
putc ('\n', out);
return OK;
}
/* Caller is responsible for ensuring that the out array is long
enough. Given length is that of in, out should be have at
least this capacity:
4 * [length/3] + length/57 + 2
But double the length will certainly be sufficient. */
int
writeBase64 (unsigned char *in, size_t length, unsigned char *out)
{
unsigned int n = BPERLIN;
while (1) {
unsigned long bits;
unsigned char *bp;
unsigned int cc;
for (cc = 0, bp = in; length > 0 && cc < 3; ++cc, ++bp, --length)
/* empty */ ;
if (cc == 0) {
break;
} else {
bits = (in[0] & 0xff) << 16;
if (cc > 1) {
bits |= (in[1] & 0xff) << 8;
if (cc > 2) {
bits |= in[2] & 0xff;
}
}
}
for (bp = out + 4; bp > out; bits >>= 6)
*--bp = nib2b64[bits & 0x3f];
if (cc < 3) {
out[3] = '=';
if (cc < 2)
out[2] = '=';
out += 4;
n = 0;
break;
}
in += 3;
out += 4;
if (--n <= 0) {
n = BPERLIN;
*out++ = '\n';
}
}
if (n != BPERLIN)
*out++ = '\n';
*out = '\0';
return OK;
}
/*
* Essentially a duplicate of writeBase64, but without line wrapping or
* newline termination (note: string IS NUL terminated)
*/
int
writeBase64raw (unsigned char *in, size_t length, unsigned char *out)
{
while (1) {
unsigned long bits;
unsigned char *bp;
unsigned int cc;
for (cc = 0, bp = in; length > 0 && cc < 3; ++cc, ++bp, --length)
/* empty */ ;
if (cc == 0) {
break;
} else {
bits = (in[0] & 0xff) << 16;
if (cc > 1) {
bits |= (in[1] & 0xff) << 8;
if (cc > 2) {
bits |= in[2] & 0xff;
}
}
}
for (bp = out + 4; bp > out; bits >>= 6)
*--bp = nib2b64[bits & 0x3f];
if (cc < 3) {
out[3] = '=';
if (cc < 2)
out[2] = '=';
out += 4;
break;
}
in += 3;
out += 4;
}
*out = '\0';
return OK;
}
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