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- /*
- * Copyright (c) Contributors, http://opensimulator.org/
- * See CONTRIBUTORS.TXT for a full list of copyright holders.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * * Neither the name of the OpenSimulator Project nor the
- * names of its contributors may be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- using System;
- using System.Collections.Generic;
- using System.Text;
- namespace OpenSim.Framework.OpenJpeg
- {
- public static class bio
- {
- public static opj_bio bio_create()
- {
- opj_bio bio = new opj_bio();
- return bio;
- }
- public static void bio_destroy(opj_bio bio)
- {
- // not needed on C#
- }
- public static int bio_numbytes(opj_bio bio)
- {
- return (bio.bp - bio.start);
- }
- public static void bio_init_enc(opj_bio bio, sbyte bp, int len)
- {
- bio.start = (byte)bp;
- bio.end = (byte)(bp + (byte)len);
- bio.bp = (byte)bp;
- bio.buf = 0;
- bio.ct = 8;
- }
- public static void bio_init_dec(opj_bio bio, sbyte bp, int len)
- {
- bio.start = (byte)bp;
- bio.end = (byte)(bp + len);
- bio.bp = (byte)bp;
- bio.buf = 0;
- bio.ct = 0;
- }
- public static void bio_write(opj_bio bio, int v, int n)
- {
- for (int i = n - 1; i >= 0; i--)
- bio_putbit(bio, (v >> i) & 1);
- }
- public static int bio_read(opj_bio bio, int n)
- {
- int v = 0;
- for (int i = n - 1; i >= 0; i--)
- v += bio_getbit(bio) << i;
- return v;
- }
- public static int bio_flush(opj_bio bio)
- {
- bio.ct = 0;
- if (bio_byteout(bio) != 0)
- return 1;
- if (bio.ct == 7)
- {
- bio.ct = 0;
- if (bio_byteout(bio) != 0)
- return 1;
- }
- return 0;
- }
- public static int bio_inalign(opj_bio bio)
- {
- bio.ct = 0;
- if ((bio.buf & 0xff) == 0xff)
- {
- if (bio_bytein(bio) != 0)
- return 1;
- bio.ct = 0;
- }
- return 0;
- }
- private static int bio_bytein(opj_bio bio)
- {
- bio.buf = (bio.buf << 8) & 0xffff;
- bio.ct = bio.buf == 0xff00 ? 7 : 8;
- if (bio.bp >= bio.end)
- return 1;
- bio.buf |= bio.bp++;
- return 0;
- }
- private static int bio_byteout(opj_bio bio)
- {
- bio.buf = (bio.buf << 8) & 0xffff;
- bio.ct = bio.buf == 0xff00 ? 7 : 8;
- if (bio.bp >= bio.end)
- return 1;
- bio.bp = (byte)(bio.buf >> 8);
- bio.bp++;
- return 0;
- }
- private static void bio_putbit(opj_bio bio, int b)
- {
- if (bio.ct == 0)
- bio_byteout(bio);
- bio.ct--;
- bio.buf |= (byte)(b << bio.ct);
- }
- private static int bio_getbit(opj_bio bio)
- {
- if (bio.ct == 0)
- bio_bytein(bio);
- bio.ct--;
- return (int)((bio.buf >> bio.ct) & 1);
- }
- }
- public struct opj_bio
- {
- public byte start;
- public byte end;
- public byte bp;
- public uint buf;
- public int ct;
- }
- }
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