forked from KolibriOS/kolibrios
132 lines
4.1 KiB
C
132 lines
4.1 KiB
C
/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
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/* cairo - a vector graphics library with display and print output
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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., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, 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 the 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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#include "cairo-error-private.h"
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#include "cairo-output-stream-private.h"
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typedef struct _cairo_base85_stream {
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cairo_output_stream_t base;
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cairo_output_stream_t *output;
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unsigned char four_tuple[4];
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int pending;
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} cairo_base85_stream_t;
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static void
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_expand_four_tuple_to_five (unsigned char four_tuple[4],
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unsigned char five_tuple[5],
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cairo_bool_t *all_zero)
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{
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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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if (all_zero)
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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 && all_zero)
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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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}
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static cairo_status_t
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_cairo_base85_stream_write (cairo_output_stream_t *base,
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const unsigned char *data,
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unsigned int length)
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{
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cairo_base85_stream_t *stream = (cairo_base85_stream_t *) base;
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const unsigned char *ptr = data;
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unsigned char five_tuple[5];
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cairo_bool_t is_zero;
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while (length) {
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stream->four_tuple[stream->pending++] = *ptr++;
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length--;
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if (stream->pending == 4) {
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_expand_four_tuple_to_five (stream->four_tuple, five_tuple, &is_zero);
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if (is_zero)
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_cairo_output_stream_write (stream->output, "z", 1);
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else
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_cairo_output_stream_write (stream->output, five_tuple, 5);
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stream->pending = 0;
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}
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}
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return _cairo_output_stream_get_status (stream->output);
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}
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static cairo_status_t
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_cairo_base85_stream_close (cairo_output_stream_t *base)
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{
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cairo_base85_stream_t *stream = (cairo_base85_stream_t *) base;
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unsigned char five_tuple[5];
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if (stream->pending) {
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memset (stream->four_tuple + stream->pending, 0, 4 - stream->pending);
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_expand_four_tuple_to_five (stream->four_tuple, five_tuple, NULL);
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_cairo_output_stream_write (stream->output, five_tuple, stream->pending + 1);
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}
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return _cairo_output_stream_get_status (stream->output);
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}
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cairo_output_stream_t *
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_cairo_base85_stream_create (cairo_output_stream_t *output)
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{
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cairo_base85_stream_t *stream;
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if (output->status)
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return _cairo_output_stream_create_in_error (output->status);
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stream = malloc (sizeof (cairo_base85_stream_t));
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if (unlikely (stream == NULL)) {
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_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
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return (cairo_output_stream_t *) &_cairo_output_stream_nil;
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}
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_cairo_output_stream_init (&stream->base,
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_cairo_base85_stream_write,
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NULL,
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_cairo_base85_stream_close);
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stream->output = output;
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stream->pending = 0;
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return &stream->base;
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}
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