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Import TechBot
svn path=/trunk/; revision=13064
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Casper Hornstrup
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274
irc/TechBot/CHMLibrary/CHMDecoding/BinaryReaderHelp.cs
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274
irc/TechBot/CHMLibrary/CHMDecoding/BinaryReaderHelp.cs
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using System;
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using System.Collections;
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using System.IO;
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using System.Text;
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using System.Globalization;
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namespace HtmlHelp.ChmDecoding
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{
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/// <summary>
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/// The class <c>BinaryReaderHelp</c> implements static helper methods for extracting binary data
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/// from a binary reader object.
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/// </summary>
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internal class BinaryReaderHelp
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{
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/// <summary>
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/// Internal helper method to extract null-terminated strings from a binary reader
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/// </summary>
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/// <param name="binReader">reference to the binary reader</param>
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/// <param name="offset">offset in the stream</param>
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/// <param name="noOffset">true if the offset value should be used</param>
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/// <param name="encoder">encoder used for text encoding</param>
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/// <returns>An extracted string value</returns>
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internal static string ExtractString(ref BinaryReader binReader, int offset, bool noOffset, Encoding encoder)
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{
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string strReturn = "";
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if(encoder == null)
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encoder = Encoding.ASCII;
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ArrayList nameBytes = new ArrayList();
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byte curByte;
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if(!noOffset)
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binReader.BaseStream.Seek(offset, SeekOrigin.Begin);
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if(binReader.BaseStream.Position >= binReader.BaseStream.Length)
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return "";
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curByte = binReader.ReadByte();
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while( (curByte != (byte)0) && (binReader.BaseStream.Position < binReader.BaseStream.Length) )
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{
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nameBytes.Add( curByte );
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curByte = binReader.ReadByte();
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}
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byte[] name = (byte[]) (nameBytes.ToArray(System.Type.GetType("System.Byte")));
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strReturn = encoder.GetString(name,0,name.Length);
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return strReturn;
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}
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/// <summary>
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/// Internal helper method to extract a string with a specific length from the binary reader
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/// </summary>
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/// <param name="binReader">reference to the binary reader</param>
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/// <param name="length">length of the string (number of bytes)</param>
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/// <param name="offset">offset in the stream</param>
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/// <param name="noOffset">true if the offset value should be used</param>
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/// <param name="encoder">encoder used for text encoding</param>
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/// <returns>An extracted string value</returns>
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internal static string ExtractString(ref BinaryReader binReader, int length, int offset, bool noOffset, Encoding encoder)
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{
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string strReturn = "";
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if(length == 0)
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return "";
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if(encoder == null)
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encoder = Encoding.ASCII;
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ArrayList nameBytes = new ArrayList();
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byte curByte;
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if(!noOffset)
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binReader.BaseStream.Seek(offset, SeekOrigin.Begin);
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if(binReader.BaseStream.Position >= binReader.BaseStream.Length)
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return "";
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curByte = binReader.ReadByte();
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while( (curByte != (byte)0) && (nameBytes.Count < length) && (binReader.BaseStream.Position < binReader.BaseStream.Length) )
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{
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nameBytes.Add( curByte );
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if(nameBytes.Count < length)
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curByte = binReader.ReadByte();
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}
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byte[] name = (byte[]) (nameBytes.ToArray(System.Type.GetType("System.Byte")));
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strReturn = encoder.GetString(name,0,name.Length);
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return strReturn;
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}
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/// <summary>
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/// Internal helper method to extract a string with a specific length from the binary reader
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/// </summary>
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/// <param name="binReader">reference to the binary reader</param>
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/// <param name="bFoundTerminator">reference to a bool vairable which will receive true if the
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/// string terminator \0 was found. false indicates that the end of the stream was reached.</param>
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/// <param name="offset">offset in the stream</param>
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/// <param name="noOffset">true if the offset value should be used</param>
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/// <param name="encoder">encoder used for text encoding</param>
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/// <returns>An extracted string value</returns>
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internal static string ExtractString(ref BinaryReader binReader, ref bool bFoundTerminator, int offset, bool noOffset, Encoding encoder)
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{
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string strReturn = "";
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ArrayList nameBytes = new ArrayList();
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byte curByte;
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if(encoder == null)
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encoder = Encoding.ASCII;
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if(!noOffset)
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binReader.BaseStream.Seek(offset, SeekOrigin.Begin);
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if(binReader.BaseStream.Position >= binReader.BaseStream.Length)
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return "";
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curByte = binReader.ReadByte();
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while( (curByte != (byte)0) && (binReader.BaseStream.Position < binReader.BaseStream.Length) )
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{
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nameBytes.Add( curByte );
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curByte = binReader.ReadByte();
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if( curByte == (byte)0 )
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{
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bFoundTerminator = true;
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}
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}
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byte[] name = (byte[]) (nameBytes.ToArray(System.Type.GetType("System.Byte")));
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strReturn = encoder.GetString(name,0,name.Length);
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return strReturn;
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}
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/// <summary>
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/// Internal helper method to extract a null-terminated UTF-16/UCS-2 strings from a binary reader
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/// </summary>
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/// <param name="binReader">reference to the binary reader</param>
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/// <param name="offset">offset in the stream</param>
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/// <param name="noOffset">true if the offset value should be used</param>
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/// <param name="encoder">encoder used for text encoding</param>
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/// <returns>An extracted string value</returns>
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internal static string ExtractUTF16String(ref BinaryReader binReader, int offset, bool noOffset, Encoding encoder)
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{
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string strReturn = "";
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ArrayList nameBytes = new ArrayList();
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byte curByte;
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int lastByte=-1;
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if(!noOffset)
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binReader.BaseStream.Seek(offset, SeekOrigin.Begin);
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if(binReader.BaseStream.Position >= binReader.BaseStream.Length)
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return "";
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if(encoder == null)
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encoder = Encoding.Unicode;
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curByte = binReader.ReadByte();
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int nCnt = 0;
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while( ((curByte != (byte)0) || (lastByte != 0) ) && (binReader.BaseStream.Position < binReader.BaseStream.Length) )
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{
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nameBytes.Add( curByte );
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if(nCnt%2 == 0)
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lastByte = (int)curByte;
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curByte = binReader.ReadByte();
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nCnt++;
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}
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byte[] name = (byte[]) (nameBytes.ToArray(System.Type.GetType("System.Byte")));
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strReturn = Encoding.Unicode.GetString(name,0,name.Length);
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// apply text encoding
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name = Encoding.Default.GetBytes(strReturn);
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strReturn = encoder.GetString(name,0,name.Length);
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return strReturn;
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}
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/// <summary>
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/// Internal helper for reading ENCINT encoded integer values
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/// </summary>
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/// <param name="binReader">reference to the reader</param>
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/// <returns>a long value</returns>
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internal static long ReadENCINT(ref BinaryReader binReader)
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{
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long nRet = 0;
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byte buffer = 0;
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int shift = 0;
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if(binReader.BaseStream.Position >= binReader.BaseStream.Length)
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return nRet;
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do
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{
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buffer = binReader.ReadByte();
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nRet |= ((long)((buffer & (byte)0x7F))) << shift;
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shift += 7;
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}while ( (buffer & (byte)0x80) != 0);
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return nRet;
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}
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/// <summary>
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/// Reads an s/r encoded value from the byte array and decodes it into an integer
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/// </summary>
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/// <param name="wclBits">a byte array containing all bits (contains only 0 or 1 elements)</param>
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/// <param name="s">scale param for encoding</param>
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/// <param name="r">root param for encoding</param>
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/// <param name="nBitIndex">current index in the wclBits array</param>
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/// <returns>Returns an decoded integer value.</returns>
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internal static int ReadSRItem(byte[] wclBits, int s, int r, ref int nBitIndex)
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{
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int nRet = 0;
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int q = r;
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int nPref1Cnt = 0;
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while( wclBits[nBitIndex++] == 1)
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{
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nPref1Cnt++;
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}
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if(nPref1Cnt == 0)
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{
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int nMask = 0;
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for(int nbits=0; nbits<q;nbits++)
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{
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nMask |= ( 0x01 & (int)wclBits[nBitIndex]) << (q-nbits-1);
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nBitIndex++;
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}
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nRet = nMask;
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}
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else
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{
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q += (nPref1Cnt-1);
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int nMask = 0;
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int nRMaxValue = 0;
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for(int nbits=0; nbits<q;nbits++)
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{
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nMask |= ( 0x01 & (int)wclBits[nBitIndex]) << (q-nbits-1);
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nBitIndex++;
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}
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for(int nsv=0; nsv<r; nsv++)
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{
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nRMaxValue = nRMaxValue << 1;
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nRMaxValue |= 0x1;
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}
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nRMaxValue++; // startvalue of s/r encoding with 1 prefixing '1'
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nRMaxValue *= (int) Math.Pow((double)2, (double)(nPref1Cnt-1));
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nRet = nRMaxValue + nMask;
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}
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return nRet;
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}
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}
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}
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