private static SvnDiffInstruction ReadInstruction(BinaryReaderEOF reader)
{
if (reader.EOF)
{
return(null);
}
SvnDiffInstruction instruction = new SvnDiffInstruction();
byte opCodeAndLength = reader.ReadByte();
instruction.OpCode = (SvnDiffInstructionOpCode)((opCodeAndLength & 0xC0) >> 6);
byte length = (byte)(opCodeAndLength & 0x3F);
if (length == 0)
{
instruction.Length = ReadInt(reader);
}
else
{
instruction.Length = length;
}
if (instruction.OpCode == SvnDiffInstructionOpCode.CopyFromSource ||
instruction.OpCode == SvnDiffInstructionOpCode.CopyFromTarget)
{
instruction.Offset = ReadInt(reader);
}
return(instruction);
}
public static SvnDiff[] ParseSvnDiff(Stream inputStream)
{
BinaryReaderEOF reader = new BinaryReaderEOF(inputStream);
byte[] signature = reader.ReadBytes(3);
byte version = reader.ReadByte();
if (signature[0] != 'S' || signature[1] != 'V' || signature[2] != 'N')
{
throw new InvalidOperationException("The signature is invalid.");
}
if (version != 0)
{
throw new Exception("Unsupported SVN diff version");
}
List <SvnDiff> diffs = new List <SvnDiff>();
while (!reader.EOF)
{
SvnDiff diff = new SvnDiff();
diff.SourceViewOffset = ReadInt(reader);
diff.SourceViewLength = ReadInt(reader);
diff.TargetViewLength = ReadInt(reader);
int instructionSectionLength = (int)ReadInt(reader);
int dataSectionLength = (int)ReadInt(reader);
diff.InstructionSectionBytes = reader.ReadBytes(instructionSectionLength);
diff.DataSectionBytes = reader.ReadBytes(dataSectionLength);
diffs.Add(diff);
}
return(diffs.ToArray());
}
private static ulong ReadInt(BinaryReaderEOF reader, out int bytesRead)
{
ulong value = 0;
bytesRead = 0;
byte b = reader.ReadByte();
bytesRead++;
while ((b & 0x80) != 0)
{
value |= (byte)(b & 0x7F);
value <<= 7;
b = reader.ReadByte();
bytesRead++;
}
value |= (ulong)b;
return(value);
}
