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using System; |
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using System.Collections.Generic; |
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using System.IO; |
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using System.Text; |
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|
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namespace Oni |
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{ |
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internal sealed class SubtitleImporter : Importer |
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{ |
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#region Private data |
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private List<byte> subtitles; |
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private List<int> offsets; |
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#endregion |
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|
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public override void Import(string filePath, string outputDirPath) |
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{ |
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ReadTextFile(filePath); |
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|
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string name = Path.GetFileNameWithoutExtension(filePath); |
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|
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BeginImport(); |
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WriteSUBT(name, subtitles.ToArray()); |
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Write(outputDirPath); |
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} |
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|
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private void ReadTextFile(string filePath) |
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{ |
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subtitles = new List<byte>(); |
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offsets = new List<int>(); |
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|
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var data = File.ReadAllBytes(filePath); |
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int i = SkipPreamble(data); |
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|
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while (i < data.Length) |
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{ |
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int nameStart = i; |
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|
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while (!IsNewLine(data, i) && data[i] != '=') |
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i++; |
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|
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int nameEnd = i; |
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|
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if (IsNewLine(data, i)) |
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{ |
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// |
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// This was an empty line or a line that does not contain a =. Skip it. |
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// |
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|
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continue; |
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} |
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|
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i++; |
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|
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int textStart = i; |
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|
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while (!IsNewLine(data, i)) |
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i++; |
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|
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int textEnd = i; |
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|
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if (nameEnd > nameStart) |
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{ |
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offsets.Add(subtitles.Count); |
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|
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for (int j = nameStart; j < nameEnd; j++) |
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subtitles.Add(data[j]); |
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|
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subtitles.Add(0); |
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|
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for (int j = textStart; j < textEnd; j++) |
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subtitles.Add(data[j]); |
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|
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subtitles.Add(0); |
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} |
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|
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i = SkipNewLine(data, i); |
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} |
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} |
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|
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private static int SkipPreamble(byte[] data) |
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{ |
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int offset = CheckPreamble(data, Encoding.UTF8.GetPreamble()); |
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|
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if (offset > 0) |
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return offset; |
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|
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if (CheckPreamble(data, Encoding.Unicode.GetPreamble()) != 0 |
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|| CheckPreamble(data, Encoding.BigEndianUnicode.GetPreamble()) != 0 |
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|| CheckPreamble(data, Encoding.UTF32.GetPreamble()) != 0) |
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{ |
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throw new InvalidDataException("UTF16/32 input text files are not supported."); |
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} |
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|
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if (data.Length >= 4) |
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{ |
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if ((data[1] == 0 && data[3] == 0) |
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|| (data[0] == 0 && data[2] == 0)) |
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{ |
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throw new InvalidDataException("UTF16/32 input text files are not supported."); |
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} |
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} |
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|
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return 0; |
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} |
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|
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private static int CheckPreamble(byte[] data, byte[] preamble) |
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{ |
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if (data.Length < preamble.Length) |
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return 0; |
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|
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for (int i = 0; i < preamble.Length; i++) |
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{ |
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if (data[i] != preamble[i]) |
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return 0; |
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} |
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|
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return preamble.Length; |
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} |
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|
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private static bool IsNewLine(byte[] data, int offset) |
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{ |
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if (offset >= data.Length) |
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return true; |
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|
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return (SkipNewLine(data, offset) > offset); |
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} |
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|
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private static int SkipNewLine(byte[] data, int offset) |
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{ |
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if (offset < data.Length) |
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{ |
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if (data[offset] == '\n') |
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{ |
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offset++; |
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} |
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else if (data[offset] == '\r') |
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{ |
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offset++; |
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|
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if (offset < data.Length && data[offset] == '\n') |
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offset++; |
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} |
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} |
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|
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return offset; |
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} |
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|
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private void WriteSUBT(string name, byte[] subtitles) |
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{ |
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var subt = CreateInstance(TemplateTag.SUBT, name); |
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|
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using (var writer = subt.OpenWrite(16)) |
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{ |
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writer.Write(WriteRawPart(subtitles)); |
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writer.Write(offsets.Count); |
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writer.Write(offsets.ToArray()); |
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} |
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} |
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} |
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} |
