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- moved all files to a "source" subdirectory to tidy up the GitHub project page
- started to write a readme.md
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hbeham
237
source/ChanSort.Api/Utils/DvbStringDecoder.cs
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237
source/ChanSort.Api/Utils/DvbStringDecoder.cs
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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 ChanSort.Api
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{
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#region Documentation
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/*
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ETSI EN 300 468
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For one-byte character tables, the codes in the range 0x80 to 0x9F are assigned to control functions
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as shown in Table A.1: Single byte control codes
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Control code - Control code Description
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0x80 to 0x85 reserved for future use
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0x86 character emphasis on
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0x87 character emphasis off
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0x88 to 0x89 reserved for future use
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0x8A CR/LF
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0x8B to 0x9F user defined
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A.2 Selection of character table
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First byte value - Character code table - Table description - Reproduced in figure
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0x01 ISO/IEC 8859-5 [27] Latin/Cyrillic alphabet A.2
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0x02 ISO/IEC 8859-6 [28] Latin/Arabic alphabet A.3
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0x03 ISO/IEC 8859-7 [29] Latin/Greek alphabet A.4
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0x04 ISO/IEC 8859-8 [30] Latin/Hebrew alphabet A.5
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0x05 ISO/IEC 8859-9 [31] Latin alphabet No. 5 A.6
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0x06 ISO/IEC 8859-10 [32] Latin alphabet No. 6 A.7
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0x07 ISO/IEC 8859-11 [33] Latin/Thai (draft only) A.8
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0x08 reserved for future use (see note)
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0x09 ISO/IEC 8859-13 [34] Latin alphabet No. 7 A.9
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0x0A ISO/IEC 8859-14 [35] Latin alphabet No. 8 (Celtic) A.10
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0x0B ISO/IEC 8859-15 [36] Latin alphabet No. 9 A.11
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0x0C to 0x0F reserved for future use
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0x10 ISO/IEC 8859 See table A.4
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0x11 ISO/IEC 10646 [16] Basic Multilingual Plane (BMP)
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0x12 KSX1001-2004 [44] Korean Character Set
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0x13 GB-2312-1980 Simplified Chinese Character
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0x14 Big5 subset of ISO/IEC 10646 [16] Traditional Chinese
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0x15 UTF-8 encoding of ISO/IEC 10646 [16] Basic Multilingual Plane (BMP)
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0x16 to 0x1E reserved for future use
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0x1F Described by encoding_type_id Described by 8 bit
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Table A.4: Character Coding Tables for first byte 0x10
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First byte value - Second byte value - Third Byte Value - Selected character code - table - Table Description
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0x10 0x00 0x00 reserved for future use
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0x10 0x00 0x01 ISO/IEC 8859-1 [23] West European
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0x10 0x00 0x02 ISO/IEC 8859-2 [24] East European
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0x10 0x00 0x03 ISO/IEC 8859-3 [25] South European
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0x10 0x00 0x04 ISO/IEC 8859-4 [26] North and North-East European
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0x10 0x00 0x05 ISO/IEC 8859-5 [27] Latin/Cyrillic A.2
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0x10 0x00 0x06 ISO/IEC 8859-6 [28] Latin/Arabic A.3
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0x10 0x00 0x07 ISO/IEC 8859-7 [29] Latin/Greek A.4
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0x10 0x00 0x08 ISO/IEC 8859-8 [30] Latin/Hebrew A.5
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0x10 0x00 0x09 ISO/IEC 8859-9 [31] West European & Turkish A.6
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0x10 0x00 0x0A ISO/IEC 8859-10 [32] North European A.7
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0x10 0x00 0x0B ISO/IEC 8859-11 [33] Thai A.8
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0x10 0x00 0x0C Reserved for future use
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0x10 0x00 0x0D ISO/IEC 8859-13 [34] Baltic A.9
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0x10 0x00 0x0E ISO/IEC 8859-14 [35] Celtic A.10
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0x10 0x00 0x0F ISO/IEC 8859-15 [36] West European A.11
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*/
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#endregion
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public class DvbStringDecoder
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{
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static readonly string[] codePages1 =
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{
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null, "iso-8859-5", "iso-8859-6", "iso-8859-7", "iso-8859-8", "iso-8859-9", "iso-8859-10", "iso-8859-11",
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null, "iso-8859-13", "iso-8859-14", "iso-8859-15", null, null, null, null,
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null, // codePages2 prefix
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"utf-16", "x-cp20949", "x-cp20936", "utf-16", "utf-8", null, null, null,
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"utf-8", null, null, null, "utf-8"
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};
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static readonly string[] codePages2 =
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{
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null, "iso-8859-1", "iso-8859-2", "iso-8859-3", "iso-8859-4", "iso-8859-5", "iso-8859-6", "iso-8859-7",
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"iso-8859-8", "iso-8859-9", "iso-8859-10", "iso-8859-11", null, "iso-8859-13", "iso-8859-14", "iso-8859-15"
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};
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private readonly Dictionary<string, Decoder> decoderCache = new Dictionary<string, Decoder>();
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public DvbStringDecoder(Encoding defaultEncoding)
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{
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this.DefaultEncoding = defaultEncoding;
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}
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public Encoding DefaultEncoding { get; set; }
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#region GetChannelNames()
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public void GetChannelNames(byte[] name, int off, int len, out string longName, out string shortName)
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{
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longName = "";
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shortName = "";
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if (len == 0)
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return;
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byte b = name[off];
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if (b == 0)
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return;
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Decoder decoder = this.DefaultEncoding.GetDecoder();
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bool singleByteChar = true;
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if (b < 0x20)
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{
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if (b == 0x10) // prefix for 2-byte code page
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{
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int cpIndex = name[off + 1] * 256 + name[off + 2];
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off += 2;
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len -= 2;
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SetDecoder(codePages2, cpIndex, ref decoder);
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}
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if (b <= 0x1F)
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SetDecoder(codePages1, b, ref decoder);
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singleByteChar = b < 0x10;
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++off;
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--len;
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}
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if (!singleByteChar)
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{
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char[] buffer = new char[100];
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int l= decoder.GetChars(name, off, len, buffer, 0, false);
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longName = new string(buffer, 0, l);
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return;
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}
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StringBuilder sbLong = new StringBuilder();
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StringBuilder sbShort = new StringBuilder();
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bool inShortMode = false;
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for (int c = 0; c < len; c++)
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{
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int i = off + c;
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b = name[i];
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if (b == 0x00)
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break;
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char ch = '\0';
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switch (b)
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{
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case 0x86: inShortMode = true; continue;
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case 0x87: inShortMode = false; continue;
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case 0x8a: ch = '\n'; break;
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default:
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if (b >= 0x80 && b <= 0x9f) // DVB-S control characters
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continue;
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break;
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}
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if (ch == '\0')
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{
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// read as many bytes as necessary to get a character
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char[] charArray = new char[1];
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for (int byteCnt = 1; decoder.GetChars(name, i, byteCnt, charArray, 0) == 0; byteCnt++)
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++i;
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ch = charArray[0];
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}
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if (ch == '\0')
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continue;
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sbLong.Append(ch);
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if (inShortMode)
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sbShort.Append(ch);
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}
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longName = sbLong.ToString();
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shortName = sbShort.ToString();
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}
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#endregion
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#region SetDecoder()
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private void SetDecoder(string[] codePages, int cpIndex, ref Decoder defaultDecoder)
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{
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if (cpIndex >= codePages.Length)
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return;
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Decoder decoder;
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string cp = codePages[cpIndex];
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if (cp == null)
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return;
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if (this.decoderCache.TryGetValue(cp, out decoder))
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{
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defaultDecoder = decoder;
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return;
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}
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try
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{
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var encoding = Encoding.GetEncoding(cp);
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defaultDecoder = encoding.GetDecoder();
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}
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catch (ArgumentException)
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{
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}
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decoderCache[cp] = defaultDecoder;
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}
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#endregion
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#region GetCodepageBytes()
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public static byte[] GetCodepageBytes(Encoding encoding)
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{
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var encName = encoding.WebName;
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for (int i = 0; i < codePages1.Length; i++)
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{
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if (codePages1[i] == encName)
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return new [] {(byte)i};
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}
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for (int i = 0; i < codePages2.Length; i++)
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{
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if (codePages2[i] == encName)
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return new[] { (byte)0x10, (byte)i };
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}
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return new byte[0];
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}
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#endregion
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#region GetEncoding()
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/// <summary>
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/// Pass in either a value <=0x1F excluding 0x10 or 0x10xxyy
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/// </summary>
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public static Encoding GetEncoding(int encodingMarker)
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{
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string enc = null;
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if (encodingMarker < 0x20)
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enc = codePages1[encodingMarker];
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else
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{
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encodingMarker &= 0xFFFF;
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if (encodingMarker < codePages2.Length)
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enc = codePages2[encodingMarker];
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}
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return enc == null ? null : Encoding.GetEncoding(enc);
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}
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#endregion
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}
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}
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