85 lines
2.0 KiB
C#
85 lines
2.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Drawing;
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using System.IO;
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namespace ImageDecode
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{
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public class ImageHeader
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{
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public uint Offset;
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public Format Format;
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public uint RefOffset;
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public Format RefFormat;
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public byte[] Image;
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public ImageHeader( BinaryReader reader )
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{
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Offset = reader.ReadUInt32();
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Format = (Format)( Offset >> 24 );
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Offset &= 0xFFFFFF;
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RefOffset = reader.ReadUInt16();
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RefFormat = (Format)reader.ReadUInt16();
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}
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}
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public enum Format
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{
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Format20 = 0x20,
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Format40 = 0x40,
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Format80 = 0x80,
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}
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public static class ShpReader
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{
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public static IEnumerable<byte[]> Read( Stream stream )
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{
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BinaryReader reader = new BinaryReader( stream );
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ushort numImages = reader.ReadUInt16();
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reader.ReadUInt16();
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reader.ReadUInt16();
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ushort width = reader.ReadUInt16();
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ushort height = reader.ReadUInt16();
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reader.ReadUInt32();
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List<ImageHeader> headers = new List<ImageHeader>();
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for( int i = 0 ; i < numImages ; i++ )
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headers.Add( new ImageHeader( reader ) );
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new ImageHeader( reader ); // end-of-file header
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new ImageHeader( reader ); // all-zeroes header
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foreach( ImageHeader h in headers )
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{
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reader.BaseStream.Position = h.Offset;
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switch( h.Format )
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{
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case Format.Format20:
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//throw new NotImplementedException();
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break;
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case Format.Format40:
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//throw new NotImplementedException();
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break;
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case Format.Format80:
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{
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byte[] compressedBytes = reader.ReadBytes( (int)( reader.BaseStream.Length - reader.BaseStream.Position ) );
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MemoryStream ms = new MemoryStream( compressedBytes );
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byte[] imageBytes = new byte[ width * height ];
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Format80.DecodeInto( ms, imageBytes );
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h.Image = imageBytes;
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break;
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}
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default:
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throw new InvalidDataException();
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}
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if( h.Image != null )
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yield return h.Image;
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}
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}
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}
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}
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