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98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/* cairo_output_stream.c: Output stream abstraction
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*
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* Copyright © 2005 Red Hat, Inc
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*
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* This library is free software; you can redistribute it and/or
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* modify it either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with 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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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is cairo_output_stream.c as distributed with the
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* cairo graphics library.
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*
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* The Initial Developer of the Original Code is Red Hat, Inc.
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*
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* Author(s):
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* Kristian Høgsberg <krh@redhat.com>
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*/
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#include "cairoint.h"
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static cairo_bool_t
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_convert_four_tuple (const unsigned char *four_tuple, char five_tuple[5])
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{
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cairo_bool_t all_zero;
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uint32_t value;
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int digit, i;
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value = four_tuple[0] << 24 | four_tuple[1] << 16 | four_tuple[2] << 8 | four_tuple[3];
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all_zero = TRUE;
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for (i = 0; i < 5; i++) {
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digit = value % 85;
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if (digit != 0)
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all_zero = FALSE;
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five_tuple[4-i] = digit + 33;
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value = value / 85;
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}
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return all_zero;
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}
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void
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_cairo_output_stream_write_base85_string (cairo_output_stream_t *stream,
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const char *data,
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size_t length)
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{
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unsigned char *ptr;
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unsigned char four_tuple[4];
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char five_tuple[5];
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int column;
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ptr = (unsigned char *)data;
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column = 0;
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while (length > 0) {
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if (length >= 4) {
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if (_convert_four_tuple (ptr, five_tuple)) {
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column += 1;
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_cairo_output_stream_write (stream, "z", 1);
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} else {
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column += 5;
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_cairo_output_stream_write (stream, five_tuple, 5);
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}
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length -= 4;
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ptr += 4;
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} else { /* length < 4 */
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memset (four_tuple, 0, 4);
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memcpy (four_tuple, ptr, length);
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_convert_four_tuple (four_tuple, five_tuple);
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column += length + 1;
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_cairo_output_stream_write (stream, five_tuple, length + 1);
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length = 0;
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}
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if (column >= 72) {
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_cairo_output_stream_write (stream, "\n", 1);
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column = 0;
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}
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}
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if (column > 0) {
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_cairo_output_stream_write (stream, "\n", 1);
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}
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}
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