public void ApplyCodePairs(DxfCodePairBufferReader buffer)
{
var pair = buffer.Peek();
buffer.Advance();
switch (pair.Code)
{
case 5:
((IDxfItemInternal)this).Handle = DxfCommonConverters.UIntHandle(pair.StringValue);
break;
case 8:
// just a re-iteration of the layer
break;
case 67:
// just a re-iteration of the paper space setting
break;
case 100:
Debug.Assert(pair.StringValue == AcDbEntityText || pair.StringValue == AcDbBlockEndText);
break;
case DxfCodePairGroup.GroupCodeNumber:
var groupName = DxfCodePairGroup.GetGroupName(pair.StringValue);
ExtensionDataGroups.Add(DxfCodePairGroup.FromBuffer(buffer, groupName));
break;
}
}
internal static DxfBlock FromBuffer(DxfCodePairBufferReader buffer)
{
if (!buffer.ItemsRemain)
{
return null;
}
var block = new DxfBlock();
var readingBlockStart = true;
var readingBlockEnd = false;
var entities = new List<DxfEntity>();
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
if (DxfCodePair.IsSectionEnd(pair))
{
// done reading blocks
buffer.Advance(); // swallow (0, ENDSEC)
break;
}
else if (IsBlockStart(pair))
{
if (readingBlockStart)
{
// if another block is found, stop reading this one because some blocks don't specify (0, ENDBLK)
break;
}
break;
}
else if (IsBlockEnd(pair))
{
if (!readingBlockStart) throw new DxfReadException("Unexpected block end", pair);
readingBlockStart = false;
readingBlockEnd = true;
buffer.Advance(); // swallow (0, ENDBLK)
}
else if (pair.Code == 0)
{
// should be an entity
var entity = DxfEntity.FromBuffer(buffer);
if (entity != null)
{
// entity could be null if it's unsupported
entities.Add(entity);
}
}
else
{
// read value pair
if (readingBlockStart)
{
buffer.Advance();
switch (pair.Code)
{
case 1:
block.XrefName = pair.StringValue;
break;
case 2:
block.Name = pair.StringValue;
break;
case 3:
break;
case 4:
block.Description = pair.StringValue;
break;
case 5:
((IDxfItemInternal)block).Handle = DxfCommonConverters.UIntHandle(pair.StringValue);
break;
case 8:
block.Layer = pair.StringValue;
break;
case 10:
block.BasePoint = block.BasePoint.WithUpdatedX(pair.DoubleValue);
break;
case 20:
block.BasePoint = block.BasePoint.WithUpdatedY(pair.DoubleValue);
break;
case 30:
block.BasePoint = block.BasePoint.WithUpdatedZ(pair.DoubleValue);
break;
case 67:
block.IsInPaperSpace = DxfCommonConverters.BoolShort(pair.ShortValue);
break;
case 70:
block.Flags = pair.ShortValue;
break;
case 330:
((IDxfItemInternal)block).OwnerHandle = DxfCommonConverters.UIntHandle(pair.StringValue);
break;
case DxfCodePairGroup.GroupCodeNumber:
var groupName = DxfCodePairGroup.GetGroupName(pair.StringValue);
block.ExtensionDataGroups.Add(DxfCodePairGroup.FromBuffer(buffer, groupName));
break;
case (int)DxfXDataType.ApplicationName:
block.XData = DxfXData.FromBuffer(buffer, pair.StringValue);
break;
}
}
else if (readingBlockEnd)
{
block.EndBlock.ApplyCodePairs(buffer);
}
else
{
throw new DxfReadException("Unexpected pair in block", pair);
}
}
}
var collected = DxfEntitiesSection.GatherEntities(entities);
foreach (var entity in collected)
{
block.Entities.Add(entity);
}
return block;
}
internal static DxfTable FromBuffer(DxfCodePairBufferReader buffer)
{
var pair = buffer.Peek();
buffer.Advance();
if (pair.Code != 2)
{
throw new DxfReadException("Expected table type.", pair);
}
var tableType = pair.StringValue;
// read common table values
var commonValues = new List <DxfCodePair>();
var groups = new List <DxfCodePairGroup>();
pair = buffer.Peek();
while (pair != null && pair.Code != 0)
{
buffer.Advance();
if (pair.Code == DxfCodePairGroup.GroupCodeNumber)
{
var groupName = DxfCodePairGroup.GetGroupName(pair.StringValue);
groups.Add(DxfCodePairGroup.FromBuffer(buffer, groupName));
}
else
{
commonValues.Add(pair);
}
pair = buffer.Peek();
}
DxfTable result;
switch (tableType)
{
case DxfTable.AppIdText:
result = DxfAppIdTable.ReadFromBuffer(buffer);
break;
case DxfTable.BlockRecordText:
result = DxfBlockRecordTable.ReadFromBuffer(buffer);
break;
case DxfTable.DimStyleText:
result = DxfDimStyleTable.ReadFromBuffer(buffer);
break;
case DxfTable.LayerText:
result = DxfLayerTable.ReadFromBuffer(buffer);
break;
case DxfTable.LTypeText:
result = DxfLTypeTable.ReadFromBuffer(buffer);
break;
case DxfTable.StyleText:
result = DxfStyleTable.ReadFromBuffer(buffer);
break;
case DxfTable.UcsText:
result = DxfUcsTable.ReadFromBuffer(buffer);
break;
case DxfTable.ViewText:
result = DxfViewTable.ReadFromBuffer(buffer);
break;
case DxfTable.ViewPortText:
result = DxfViewPortTable.ReadFromBuffer(buffer);
break;
default:
SwallowTable(buffer);
result = null;
break;
}
if (result != null)
{
// set common values
foreach (var common in commonValues)
{
switch (common.Code)
{
case 5:
result.Handle = DxfCommonConverters.UIntHandle(common.StringValue);
break;
case 70:
// entry count, read dynamically
break;
case 330:
result.OwnerHandle = DxfCommonConverters.UIntHandle(common.StringValue);
break;
}
}
foreach (var group in groups)
{
result.ExtensionDataGroups.Add(group);
}
result.AfterRead();
}
return(result);
}
