protected override Variant GenerateInternalValue()
{
Variant value;
// 1. Default value
if (_mutatedValue == null)
{
var stream = new BitStreamList()
{
Name = fullName
};
foreach (var child in this)
{
var val = child.Value;
val.Name = child.fullName;
stream.Add(val);
}
value = new Variant(stream);
}
else
{
value = MutatedValue;
}
// 2. Relations
if (_mutatedValue != null && mutationFlags.HasFlag(MutateOverride.Relations))
{
return(MutatedValue);
}
foreach (var r in relations.From <Relation>())
{
// CalculateFromValue can return null sometimes
// when mutations mess up the relation.
// In that case use the exsiting value for this element.
var relationValue = r.CalculateFromValue();
if (relationValue != null)
{
value = relationValue;
}
}
// 3. Fixup
if (_mutatedValue != null && mutationFlags.HasFlag(MutateOverride.Fixup))
{
return(MutatedValue);
}
if (_fixup != null)
{
value = _fixup.fixup(this);
}
return(value);
}
protected override Variant fixupImpl()
{
var ref1 = elements["ref1"];
var ref2 = elements["ref2"];
var data = new BitStreamList();
data.Add(ref1.Value);
data.Add(ref2.Value);
data.Seek(0, System.IO.SeekOrigin.Begin);
CRCTool crcTool = new CRCTool();
crcTool.Init(type);
return(new Variant((uint)crcTool.crctablefast(data)));
}
public void TestUnalignedRead()
{
BitStreamList lst = new BitStreamList();
var bs1 = new BitStream();
bs1.WriteBits(0xaa, 12);
lst.Add(bs1);
var bs2a = new BitStream();
bs2a.WriteBits(0x7, 3);
lst.Add(bs2a);
var bs2b = new BitStream();
bs2b.WriteBits(0x7, 4);
lst.Add(bs2b);
var bs3 = new BitStream();
bs3.WriteBits(0x10a, 18);
lst.Add(bs3);
lst.SeekBits(10, SeekOrigin.Begin);
Assert.AreEqual(37, lst.LengthBits);
var buf = new byte[4];
int len = lst.Read(buf, 0, buf.Length);
Assert.AreEqual(3, len); // 2bit + 7bit + 18bit = 27bit = 3 bytes
Assert.AreEqual(37, lst.LengthBits);
Assert.AreEqual(34, lst.PositionBits);
Assert.AreEqual(4, lst.Length);
Assert.AreEqual(4, lst.Position);
// 00 00 10 10 10 10 11 10 11 10 00 00 00 00 10 00 01 01 0
// 10 11 10 11 10 00 00 00 00 10 00 01
// 0xbb 0x80 0x21
Assert.AreEqual(new byte[] { 0xbb, 0x80, 0x21, 0x00 }, buf);
lst.SeekBits(0, SeekOrigin.Begin);
int bits = (int)lst[0].LengthBits + 1;
ulong tmp;
int cnt = lst.ReadBits(out tmp, bits);
Assert.AreEqual(bits, cnt);
}
/// <summary>
/// Ensures that the data stream length is in full bytes
/// by padding with up to 7 bits of '0'
/// </summary>
/// <param name="data">Stream of bits</param>
/// <returns>Stream of bits padded to a byte boundary</returns>
protected static BitwiseStream PadBits(BitwiseStream data)
{
long lengthBits = data.LengthBits;
int extra = 8 - (int)(lengthBits % 8);
if (extra != 8)
{
BitStreamList lst = new BitStreamList();
lst.Add(data);
BitStream pad = new BitStream();
pad.WriteBits(0, extra);
lst.Add(pad);
lengthBits += extra;
data = lst;
}
return(data);
}
public void TestList()
{
BitStreamList lst = new BitStreamList();
lst.Add(new BitStream(new MemoryStream(Encoding.ASCII.GetBytes("Hello"))));
lst.Add(new BitStream(new MemoryStream(Encoding.ASCII.GetBytes("World"))));
Assert.AreEqual(0, lst.Position);
Assert.AreEqual(0, lst.PositionBits);
Assert.AreEqual(10, lst.Length);
Assert.AreEqual(80, lst.LengthBits);
long ret = lst.SeekBits(12, SeekOrigin.Begin);
Assert.AreEqual(12, ret);
Assert.AreEqual(1, lst.Position);
Assert.AreEqual(12, lst.PositionBits);
ret = lst.Seek(2, SeekOrigin.Current);
Assert.AreEqual(3, ret);
Assert.AreEqual(3, lst.Position);
Assert.AreEqual(28, lst.PositionBits);
ret = lst.SeekBits(-12, SeekOrigin.End);
Assert.AreEqual(68, ret);
Assert.AreEqual(8, lst.Position);
Assert.AreEqual(68, lst.PositionBits);
ulong bits;
int b = lst.ReadBits(out bits, 15);
Assert.AreEqual(12, b);
Assert.AreEqual(0xc64, bits);
Assert.AreEqual(lst.Length, lst.Position);
Assert.AreEqual(lst.LengthBits, lst.PositionBits);
lst.Add(new BitStream(new MemoryStream(Encoding.ASCII.GetBytes("!"))));
Assert.AreEqual(10, lst.Position);
Assert.AreEqual(80, lst.PositionBits);
Assert.AreEqual(11, lst.Length);
Assert.AreEqual(88, lst.LengthBits);
ret = lst.SeekBits(-12, SeekOrigin.End);
Assert.AreEqual(76, ret);
Assert.AreEqual(9, lst.Position);
Assert.AreEqual(76, lst.PositionBits);
b = lst.ReadBits(out bits, 15);
Assert.AreEqual(12, b);
Assert.AreEqual(lst.Length, lst.Position);
Assert.AreEqual(lst.LengthBits, lst.PositionBits);
Assert.AreEqual(0x421, bits);
var buf = new byte[3];
b = lst.Read(buf, 0, buf.Length);
Assert.AreEqual(0, b);
Assert.AreEqual(lst.Length, lst.Position);
Assert.AreEqual(lst.LengthBits, lst.PositionBits);
lst.Seek(-3, SeekOrigin.End);
b = lst.Read(buf, 0, buf.Length);
Assert.AreEqual(3, b);
Assert.AreEqual(Encoding.ASCII.GetBytes("ld!"), buf);
Assert.AreEqual(lst.Length, lst.Position);
Assert.AreEqual(lst.LengthBits, lst.PositionBits);
}
private static BitwiseStream GrowByBits(BitwiseStream data, long growBy)
{
var dataLen = data.LengthBits;
var tgtLen = dataLen + growBy;
if (tgtLen <= 0)
{
// Return empty if size is negative
data = new BitStream();
}
else if (data.LengthBits == 0)
{
// If objOf is a block, data is a BitStreamList
data = new BitStream();
// Fill with 'A' if we don't have any data
while (data.LengthBits < growBy)
{
data.WriteByte((byte)'A');
}
// Truncate to the correct bit length
data.SetLengthBits(growBy);
}
else
{
// Loop data over and over until we get to our target length
var lst = new BitStreamList();
while (tgtLen > dataLen)
{
lst.Add(data);
tgtLen -= dataLen;
}
var dst = new BitStream();
data.Seek(0, System.IO.SeekOrigin.Begin);
while (tgtLen > 0)
{
ulong bits;
int len = data.ReadBits(out bits, (int)Math.Min(tgtLen, 64));
if (len == 0)
{
data.Seek(0, System.IO.SeekOrigin.Begin);
}
else
{
dst.WriteBits(bits, len);
}
tgtLen -= len;
}
lst.Add(dst);
data = lst;
}
return(data);
}
private static BitwiseStream GrowByBytes(BitwiseStream data, long growBy)
{
var dataLen = data.Length;
var tgtLen = dataLen + growBy;
if (tgtLen <= 0)
{
// Return empty if size is negative
data = new BitStream();
}
else if (data.Length == 0)
{
// If objOf is a block, data is a BitStreamList
data = new BitStream();
// Fill with 'A' if we don't have any data
while (--tgtLen > 0)
{
data.WriteByte((byte)'A');
}
}
else
{
// Loop data over and over until we get to our target length
var lst = new BitStreamList();
while (tgtLen > dataLen)
{
lst.Add(data);
tgtLen -= dataLen;
}
var buf = new byte[BitwiseStream.BlockCopySize];
var dst = new BitStream();
data.Seek(0, System.IO.SeekOrigin.Begin);
while (tgtLen > 0)
{
int len = (int)Math.Min(tgtLen, buf.Length);
len = data.Read(buf, 0, len);
if (len == 0)
{
data.Seek(0, System.IO.SeekOrigin.Begin);
}
else
{
dst.Write(buf, 0, len);
}
tgtLen -= len;
}
lst.Add(dst);
data = lst;
}
return(data);
}
