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#include <glib.h>
#include "camel-utf8.h"
/**
* camel_utf8_putc:
* @ptr:
* @c:
*
* Output a 32 bit unicode character as utf8 octets. At most 4 octets will
* be written to @ptr. @ptr will be advanced to the next character position.
**/
void
camel_utf8_putc(unsigned char **ptr, guint32 c)
{
register unsigned char *p = *ptr;
if (c <= 0x7f)
*p++ = c;
else if (c <= 0x7ff) {
*p++ = 0xc0 | c >> 6;
*p++ = 0x80 | (c & 0x3f);
} else if (c <= 0xffff) {
*p++ = 0xe0 | c >> 12;
*p++ = 0x80 | ((c >> 6) & 0x3f);
*p++ = 0x80 | (c & 0x3f);
} else {
/* see unicode standard 3.0, S 3.8, max 4 octets */
*p++ = 0xf0 | c >> 18;
*p++ = 0x80 | ((c >> 12) & 0x3f);
*p++ = 0x80 | ((c >> 6) & 0x3f);
*p++ = 0x80 | (c & 0x3f);
}
*ptr = p;
}
/**
* camel_utf8_getc:
* @ptr:
*
* Get a Unicode character from a utf8 stream. @ptr will be advanced
* to the next character position. Invalid utf8 characters will be
* silently skipped. @ptr should point to a NUL terminated array.
*
* Return value: The next Unicode character. @ptr will be advanced to
* the next character always.
**/
guint32
camel_utf8_getc(const unsigned char **ptr)
{
register unsigned char *p = (unsigned char *)*ptr;
register unsigned char c, r;
register guint32 v, m;
again:
r = *p++;
loop:
if (r < 0x80) {
*ptr = p;
v = r;
} else if (r < 0xf8) { /* valid start char? (max 4 octets) */
v = r;
m = 0x7f80; /* used to mask out the length bits */
do {
c = *p++;
if ((c & 0xc0) != 0x80) {
r = c;
goto loop;
}
v = (v<<6) | (c & 0x3f);
r<<=1;
m<<=5;
} while (r & 0x40);
*ptr = p;
v &= ~m;
} else {
goto again;
}
return v;
}
/**
* camel_utf8_getc_limit:
* @ptr:
* @end: must not be NULL.
*
* Get the next utf8 char at @ptr, and return it, advancing @ptr to
* the next character. If @end is reached before a full utf8
* character can be read, then the invalid Unicode char 0xffff is
* returned as a sentinel (Unicode 3.1, section 2.7), and @ptr is not
* advanced.
*
* Return value: The next utf8 char, or 0xffff.
**/
guint32
camel_utf8_getc_limit(const unsigned char **ptr, const unsigned char *end)
{
register unsigned char *p = (unsigned char *)*ptr;
register unsigned char c, r;
register guint32 v = 0xffff, m;
again:
while (p < end) {
r = *p++;
loop:
if (r < 0x80) {
*ptr = p;
return r;
} else if (r < 0xf8) { /* valid start char? (max 4 octets) */
v = r;
m = 0x7f80; /* used to mask out the length bits */
do {
if (p >= end)
return 0xffff;
c = *p++;
if ((c & 0xc0) != 0x80) {
r = c;
goto loop;
}
v = (v<<6) | (c & 0x3f);
r<<=1;
m<<=5;
} while (r & 0x40);
*ptr = p;
v &= ~m;
return v;
} else {
goto again;
}
}
return 0xffff;
}
void
g_string_append_u(GString *out, guint32 c)
{
unsigned char buffer[8];
unsigned char *p = buffer;
camel_utf8_putc(&p, c);
*p = 0;
g_string_append(out, buffer);
}
static char *utf7_alphabet =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
static unsigned char utf7_rank[256] = {
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x3e,0x3f,0xff,0xff,0xff,
0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,
0x0f,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0xff,0xff,0xff,0xff,0xff,
0xff,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,
0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,0x30,0x31,0x32,0x33,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
};
/**
* camel_utf7_utf8:
* @ptr:
*
* Convert a modified utf7 string to utf8. If the utf7 string
* contains 8 bit characters, they are treated as iso-8859-1.
*
* The IMAP rules [rfc2060] are used in the utf7 encoding.
*
* Return value: The converted string.
**/
char *
camel_utf7_utf8(const char *ptr)
{
const unsigned char *p = (unsigned char *)ptr;
unsigned int c;
guint32 v=0, x;
GString *out;
int i=0;
int state = 0;
char *ret;
out = g_string_new("");
do {
c = *p++;
switch(state) {
case 0:
if (c == '&')
state = 1;
else
g_string_append_u(out, c);
break;
case 1:
if (c == '-') {
g_string_append_c(out, '&');
state = 0;
} else if (utf7_rank[c] != 0xff) {
v = utf7_rank[c];
i = 6;
state = 2;
} else {
/* invalid */
g_string_append(out, "&-");
state = 0;
}
break;
case 2:
if (c == '-') {
state = 0;
} else if (utf7_rank[c] != 0xff) {
v = (v<<6) | utf7_rank[c];
i+=6;
if (i >= 16) {
x = (v >> (i-16)) & 0xffff;
g_string_append_u(out, x);
i-=16;
}
} else {
g_string_append_u(out, c);
state = 0;
}
break;
}
} while (c);
ret = g_strdup(out->str);
g_string_free(out, TRUE);
return ret;
}
static void utf7_closeb64(GString *out, guint32 v, guint32 i)
{
guint32 x;
if (i>0) {
x = (v << (6-i)) & 0x3f;
g_string_append_c(out, utf7_alphabet[x]);
}
g_string_append_c(out, '-');
}
/**
* camel_utf8_utf7:
* @ptr:
*
* Convert a utf8 string to a modified utf7 format.
*
* The IMAP rules [rfc2060] are used in the utf7 encoding.
*
* Return value:
**/
char *
camel_utf8_utf7(const char *ptr)
{
const unsigned char *p = (unsigned char *)ptr;
unsigned int c;
guint32 x, v = 0;
int state = 0;
GString *out;
int i = 0;
char *ret;
out = g_string_new("");
while ( (c = camel_utf8_getc(&p)) ) {
if (c >= 0x20 && c <= 0x7e) {
if (state == 1) {
utf7_closeb64(out, v, i);
state = 0;
i = 0;
}
if (c == '&')
g_string_append(out, "&-");
else
g_string_append_c(out, c);
} else {
if (state == 0) {
g_string_append_c(out, '&');
state = 1;
}
v = (v << 16) | c;
i += 16;
while (i >= 6) {
x = (v >> (i-6)) & 0x3f;
g_string_append_c(out, utf7_alphabet[x]);
i -= 6;
}
}
}
if (state == 1)
utf7_closeb64(out, v, i);
ret = g_strdup(out->str);
g_string_free(out, TRUE);
return ret;
}
|
