internal void Write(BitWriter writer, DwgObjectMap objectMap, HashSet <int> writtenHandles, int pointerOffset, DwgVersionId version)
{
if (!writtenHandles.Add(Handle.HandleOrOffset))
{
// already been written
return;
}
PrepareCommonValues();
OnBeforeObjectWrite();
SetCommonValues();
objectMap.SetOffset(Handle.HandleOrOffset, writer.Position);
// write object to memory so the size can be computed
using (var ms = new MemoryStream())
{
var tempWriter = new BitWriter(ms);
tempWriter.Write_BS((short)Type);
WriteCommonDataStart(tempWriter, objectMap, pointerOffset);
WriteSpecific(tempWriter, objectMap, pointerOffset, version);
WriteCommonDataEnd(tempWriter, objectMap, pointerOffset);
var tempBytes = tempWriter.AsBytes();
// now output everything
writer.StartCrcCalculation(initialValue: DwgHeaderVariables.InitialCrcValue);
writer.Write_MS(tempBytes.Length);
writer.WriteBytes(tempBytes);
writer.WriteCrc();
}
foreach (var child in ChildItems)
{
child.Write(writer, objectMap, writtenHandles, pointerOffset, version);
}
}
public void WriteSimpleFileHeader()
{
var expected = new byte[]
{
(byte)'A', (byte)'C', (byte)'1', (byte)'0', (byte)'1', (byte)'4',
0, 0, 0, 0, 0,
42, // maintver
1,
0x78, 0x56, 0x34, 0x12, // image seeker
0, 0, // unknown
0x00, 0x01, // codepage
5, 0, 0, 0, // 5 section locators
0, 0, 0, 0, 0, 0, 0, 0, 0, // header locator
0, 0, 0, 0, 0, 0, 0, 0, 0, // class section locator
0, 0, 0, 0, 0, 0, 0, 0, 0, // object map locator
0, 0, 0, 0, 0, 0, 0, 0, 0, // unknown R13C3 and later locator
0, 0, 0, 0, 0, 0, 0, 0, 0, // unknown padding locator
0x63, 0xF1, // CRC
0x95, 0xA0, 0x4E, 0x28, 0x99, 0x82, 0x1A, 0xE5, // sentinel
0x5E, 0x41, 0xE0, 0x5F, 0x9D, 0x3A, 0x4D, 0x00,
};
var fileHeader = new DwgFileHeader(DwgVersionId.R14, 42, 0x12345678, 256);
using (var ms = new MemoryStream())
{
var writer = new BitWriter(ms);
fileHeader.Write(writer);
var actual = writer.AsBytes();
Assert.Equal(expected, actual);
}
}
public void RoundTrip()
{
foreach (var version in AllVersions)
{
using (var ms = new MemoryStream())
{
// write it
var writer = new BitWriter(ms);
var variables = new DwgHeaderVariables();
variables.Write(writer, version);
// read it
var reader = new BitReader(writer.AsBytes());
var variables2 = DwgHeaderVariables.Parse(reader, version);
// this also verifies the CRC
}
}
}
