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RRTcodebaseC

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* @param to_encode Null-terminated UTF-8 string to encode
* @param change_spaces If set, spaces are encoded using the underscore character.
* @return Null-terminated encoded string. Must be free()'d after usage.
* Halts the program on memory allocation errors,
* for all other errors, an empty string is returned.
* NULL is never returned.
*/
char* dc_encode_modified_utf7(const char* to_encode, int change_spaces)
{
#define UTF16MASK 0x03FFUL
#define UTF16SHIFT 10
#define UTF16BASE 0x10000UL
#define UTF16HIGHSTART 0xD800UL
#define UTF16HIGHEND 0xDBFFUL
#define UTF16LOSTART 0xDC00UL
#define UTF16LOEND 0xDFFFUL
#define UNDEFINED 64
unsigned int utf8pos = 0;
unsigned int utf8total = 0;
unsigned int c = 0;
unsigned int utf7mode = 0;
unsigned int bitstogo = 0;
unsigned int utf16flag = 0;
unsigned long ucs4 = 0;
unsigned long bitbuf = 0;
char* dst = NULL;
char* res = NULL;
if (!to_encode) {
return dc_strdup("");
}
res = (char*)malloc(2*strlen(to_encode)+1);
dst = res;
if(!dst) {
exit(51);
}
utf7mode = 0;
utf8total = 0;
bitstogo = 0;
utf8pos = 0;
while ((c = (unsigned char)*to_encode) != '\0')
{
++to_encode;
// normal character?
if (c >= ' ' && c <= '~' && (c != '_' || !change_spaces)) {
// switch out of UTF-7 mode
if (utf7mode) {
if (bitstogo) {
*dst++ = base64chars[(bitbuf << (6 - bitstogo)) & 0x3F];
}
*dst++ = '-';
utf7mode = 0;
utf8pos = 0;
bitstogo = 0;
utf8total= 0;
}
if (change_spaces && c==' ') {
*dst++ = '_';
}
else {
*dst++ = c;
}
// encode '&' as '&-'
if (c=='&') {
*dst++ = '-';
}
continue;
}
// switch to UTF-7 mode
if (!utf7mode) {
*dst++ = '&';
utf7mode = 1;
}
// encode ascii characters as themselves
if (c < 0x80) {
ucs4 = c;
}
else if (utf8total) {
// save UTF8 bits into UCS4
ucs4 = (ucs4 << 6) | (c & 0x3FUL);
if (++utf8pos < utf8total) {
continue;
}
}
else {
utf8pos = 1;
if (c < 0xE0) {
utf8total = 2;
ucs4 = c & 0x1F;
}
else if (c < 0xF0) {
utf8total = 3;
ucs4 = c & 0x0F;
}
else {