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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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