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/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "buffer.h"
#include "hex-binary.h"
#include "quoted-printable.h"
int quoted_printable_q_decode(const unsigned char *src, size_t src_size,
buffer_t *dest)
{
char hexbuf[3];
size_t src_pos, next;
bool errors = FALSE;
hexbuf[2] = '\0';
next = 0;
for (src_pos = 0; src_pos < src_size; src_pos++) {
if (src[src_pos] != '_' && src[src_pos] != '=')
continue;
buffer_append(dest, src + next, src_pos - next);
next = src_pos;
if (src[src_pos] == '_') {
buffer_append_c(dest, ' ');
next++;
continue;
}
if (src_pos+2 >= src_size)
break;
/* =<hex> */
hexbuf[0] = src[src_pos+1];
hexbuf[1] = src[src_pos+2];
if (hex_to_binary(hexbuf, dest) == 0) {
src_pos += 2;
next = src_pos+1;
} else {
/* non-hex data, show as-is */
errors = TRUE;
next = src_pos;
}
}
buffer_append(dest, src + next, src_size - next);
return errors ? -1 : 0;
}
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