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