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/*
* LibSylph -- E-Mail client library
* Copyright (C) 1999-2005 Hiroyuki Yamamoto
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <glib.h>
#include <ctype.h>
static gboolean get_hex_value(guchar *out, gchar c1, gchar c2);
static void get_hex_str(gchar *out, guchar ch);
#define MAX_LINELEN 76
#define IS_LBREAK(p) \
(*(p) == '\0' || *(p) == '\n' || (*(p) == '\r' && *((p) + 1) == '\n'))
#define SOFT_LBREAK_IF_REQUIRED(n) \
if (len + (n) > MAX_LINELEN || \
(len + (n) == MAX_LINELEN && (!IS_LBREAK(inp + 1)))) { \
*outp++ = '='; \
*outp++ = '\n'; \
len = 0; \
}
void qp_encode_line(gchar *out, const guchar *in)
{
const guchar *inp = in;
gchar *outp = out;
guchar ch;
gint len = 0;
while (*inp != '\0') {
ch = *inp;
if (IS_LBREAK(inp)) {
*outp++ = '\n';
len = 0;
if (*inp == '\r')
inp++;
inp++;
} else if (ch == '\t' || ch == ' ') {
if (IS_LBREAK(inp + 1)) {
SOFT_LBREAK_IF_REQUIRED(3);
*outp++ = '=';
get_hex_str(outp, ch);
outp += 2;
len += 3;
inp++;
} else {
SOFT_LBREAK_IF_REQUIRED(1);
*outp++ = *inp++;
len++;
}
} else if ((ch >= 33 && ch <= 60) || (ch >= 62 && ch <= 126)) {
SOFT_LBREAK_IF_REQUIRED(1);
*outp++ = *inp++;
len++;
} else {
SOFT_LBREAK_IF_REQUIRED(3);
*outp++ = '=';
get_hex_str(outp, ch);
outp += 2;
len += 3;
inp++;
}
}
if (len > 0)
*outp++ = '\n';
*outp = '\0';
}
gint qp_decode_line(gchar *str)
{
gchar *inp = str, *outp = str;
while (*inp != '\0') {
if (*inp == '=') {
if (inp[1] && inp[2] &&
get_hex_value((guchar *)outp, inp[1], inp[2])
== TRUE) {
inp += 3;
} else if (inp[1] == '\0' || g_ascii_isspace(inp[1])) {
/* soft line break */
break;
} else {
/* broken QP string */
*outp = *inp++;
}
} else {
*outp = *inp++;
}
outp++;
}
*outp = '\0';
return outp - str;
}
gint qp_decode_q_encoding(guchar *out, const gchar *in, gint inlen)
{
const gchar *inp = in;
guchar *outp = out;
if (inlen < 0)
inlen = G_MAXINT;
while (inp - in < inlen && *inp != '\0') {
if (*inp == '=' && inp + 3 - in <= inlen) {
if (get_hex_value(outp, inp[1], inp[2]) == TRUE) {
inp += 3;
} else {
*outp = *inp++;
}
} else if (*inp == '_') {
*outp = ' ';
inp++;
} else {
*outp = *inp++;
}
outp++;
}
*outp = '\0';
return outp - out;
}
gint qp_get_q_encoding_len(const guchar *str)
{
const guchar *inp = str;
gint len = 0;
while (*inp != '\0') {
if (*inp == 0x20)
len++;
else if (*inp == '=' || *inp == '?' || *inp == '_' ||
*inp < 32 || *inp > 127 || g_ascii_isspace(*inp))
len += 3;
else
len++;
inp++;
}
return len;
}
void qp_q_encode(gchar *out, const guchar *in)
{
const guchar *inp = in;
gchar *outp = out;
while (*inp != '\0') {
if (*inp == 0x20)
*outp++ = '_';
else if (*inp == '=' || *inp == '?' || *inp == '_' ||
*inp < 32 || *inp > 127 || g_ascii_isspace(*inp)) {
*outp++ = '=';
get_hex_str(outp, *inp);
outp += 2;
} else
*outp++ = *inp;
inp++;
}
*outp = '\0';
}
#define HEX_TO_INT(val, hex) \
{ \
gchar c = hex; \
\
if ('0' <= c && c <= '9') { \
val = c - '0'; \
} else if ('a' <= c && c <= 'f') { \
val = c - 'a' + 10; \
} else if ('A' <= c && c <= 'F') { \
val = c - 'A' + 10; \
} else { \
val = -1; \
} \
}
static gboolean get_hex_value(guchar *out, gchar c1, gchar c2)
{
gint hi, lo;
HEX_TO_INT(hi, c1);
HEX_TO_INT(lo, c2);
if (hi == -1 || lo == -1)
return FALSE;
*out = (hi << 4) + lo;
return TRUE;
}
#define INT_TO_HEX(hex, val) \
{ \
if ((val) < 10) \
hex = '0' + (val); \
else \
hex = 'A' + (val) - 10; \
}
static void get_hex_str(gchar *out, guchar ch)
{
gchar hex;
INT_TO_HEX(hex, ch >> 4);
*out++ = hex;
INT_TO_HEX(hex, ch & 0x0f);
*out++ = hex;
}
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