107 lines
3.0 KiB
C
107 lines
3.0 KiB
C
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is libguac-client-rdp.
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*
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* The Initial Developer of the Original Code is
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* Michael Jumper.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include <stdint.h>
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int guac_rdp_encode_utf8(int codepoint, char* utf8) {
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int i;
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int mask, bytes;
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/* Determine size and initial byte mask */
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if (codepoint <= 0x007F) {
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mask = 0x00;
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bytes = 1;
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}
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else if (codepoint <= 0x7FF) {
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mask = 0xC0;
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bytes = 2;
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}
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else if (codepoint <= 0xFFFF) {
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mask = 0xE0;
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bytes = 3;
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}
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else if (codepoint <= 0x1FFFFF) {
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mask = 0xF0;
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bytes = 4;
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}
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/* Otherwise, invalid codepoint */
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else {
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*(utf8++) = '?';
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return 1;
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}
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/* Offset buffer by size */
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utf8 += bytes - 1;
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/* Add trailing bytes, if any */
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for (i=1; i<bytes; i++) {
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*(utf8--) = 0x80 | (codepoint & 0x3F);
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codepoint >>= 6;
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}
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/* Set initial byte */
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*utf8 = mask | codepoint;
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/* Done */
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return bytes;
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}
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void guac_rdp_utf16_to_utf8(const unsigned char* utf16, char* utf8, int length) {
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int i;
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const uint16_t* in_codepoint = (const uint16_t*) utf16;
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/* For each UTF-16 character */
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for (i=0; i<length; i++) {
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/* Get next codepoint */
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uint16_t codepoint = *(in_codepoint++);
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/* Save codepoint as UTF-8 */
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utf8 += guac_rdp_encode_utf8(codepoint, utf8);
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}
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/* Save NULL terminator */
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*(utf8++) = 0;
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}
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