119 lines
3.9 KiB
C
119 lines
3.9 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-vnc.
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*
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* The Initial Developer of the Original Code is
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* James Muehlner.
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* Portions created by the Initial Developer are Copyright (C) 2010
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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 <stdlib.h>
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#include <string.h>
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#include <iconv.h>
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#include <errno.h>
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char* convert(const char* from_charset, const char* to_charset, char* input) {
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size_t input_remaining;
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size_t output_remaining;
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size_t bytes_converted = 0;
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char* output;
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char* output_buffer;
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char* new_buffer;
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char* input_buffer;
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size_t output_length;
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iconv_t cd;
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cd = iconv_open(to_charset, from_charset);
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if(cd == (iconv_t) -1)
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/* Cannot convert due to invalid character set */
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return NULL;
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input_remaining = strlen(input);
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input_buffer = input;
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/* Start the output buffer the same size as the input buffer */
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output_length = input_remaining;
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/* Leave some space at the end for NULL terminator */
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if (!(output = (char*) malloc(output_length + 4))) {
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/* Cannot convert due to memory allocation error */
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iconv_close(cd);
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return NULL;
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}
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do {
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output_buffer = output + bytes_converted;
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output_remaining = output_length - bytes_converted;
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bytes_converted = iconv(cd, &input_buffer,
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&input_remaining, &output_buffer, &output_remaining);
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if(bytes_converted == -1) {
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if(errno == E2BIG) {
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/* The output buffer is too small, so allocate more space */
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bytes_converted = output_buffer - output;
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output_length += input_remaining * 2 + 8;
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if (!(new_buffer = (char*) realloc(output, output_length + 4))) {
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/* Cannot convert due to memory allocation error */
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iconv_close(cd);
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free(output);
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return NULL;
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}
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output = new_buffer;
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output_buffer = output + bytes_converted;
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}
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else if (errno == EILSEQ) {
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/* Cannot convert because an invalid sequence was discovered */
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iconv_close(cd);
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free(output);
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return NULL;
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}
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else if (errno == EINVAL) {
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/* Incomplete sequence detected, can be ignored */
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break;
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}
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}
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} while (input_remaining);
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/* Flush the iconv conversion */
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iconv(cd, NULL, NULL, &output_buffer, &output_remaining);
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iconv_close(cd);
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/* Add the NULL terminator */
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memset(output_buffer, 0, 4);
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return output;
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}
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