internal static DxfBlocksSection BlocksSectionFromBuffer(DxfCodePairBufferReader buffer)
{
var section = new DxfBlocksSection();
section.Clear();
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
if (DxfCodePair.IsSectionStart(pair))
{
// done reading blocks, onto the next section
break;
}
else if (DxfCodePair.IsSectionEnd(pair))
{
// done reading blocks
buffer.Advance(); // swallow (0, ENDSEC)
break;
}
if (pair.Code != 0)
{
throw new DxfReadException("Expected new block.", pair);
}
buffer.Advance(); // swallow (0, CLASS)
var block = DxfBlock.FromBuffer(buffer);
if (block != null)
{
section.Blocks.Add(block);
}
}
return(section);
}
internal static DxfEntitiesSection EntitiesSectionFromBuffer(DxfCodePairBufferReader buffer)
{
var entities = new List <DxfEntity>();
entities.Clear();
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
if (DxfCodePair.IsSectionEnd(pair))
{
// done reading entities
buffer.Advance(); // swallow (0, ENDSEC)
break;
}
if (pair.Code != 0)
{
throw new DxfReadException("Expected new entity.", pair);
}
var entity = DxfEntity.FromBuffer(buffer);
if (entity != null)
{
entities.Add(entity);
}
}
var section = new DxfEntitiesSection();
var collected = GatherEntities(entities);
section.Entities.AddRange(collected);
return(section);
}
internal static DxfHeaderSection HeaderSectionFromBuffer(DxfCodePairBufferReader buffer)
{
var section = new DxfHeaderSection();
string keyName = null;
Func <short, bool> shortToBool = value => value != 0;
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
buffer.Advance();
if (DxfCodePair.IsSectionEnd(pair))
{
// done reading settings
break;
}
if (pair.Code == 9)
{
// what setting to get
keyName = pair.StringValue;
}
else
{
section.Header.SetHeaderVariable(keyName, pair);
if (string.Compare(keyName, "$ACADVER", StringComparison.OrdinalIgnoreCase) == 0 && section.Header.Version >= DxfAcadVersion.R2007)
{
// R2007 and up should switch to a UTF8 reader
buffer.SetUtf8Reader();
}
}
}
return(section);
}
internal static DxfHeaderSection HeaderSectionFromBuffer(DxfCodePairBufferReader buffer)
{
var section = new DxfHeaderSection();
string keyName = null;
Func <short, bool> shortToBool = value => value != 0;
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
buffer.Advance();
if (DxfCodePair.IsSectionEnd(pair))
{
// done reading settings
break;
}
if (pair.Code == 9)
{
// what setting to get
keyName = pair.StringValue;
}
else
{
section.Header.SetHeaderVariable(keyName, pair);
}
}
return(section);
}
internal static DxfClassesSection ClassesSectionFromBuffer(DxfCodePairBufferReader buffer, DxfAcadVersion version)
{
var section = new DxfClassesSection();
section.Clear();
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
if (DxfCodePair.IsSectionEnd(pair))
{
// done reading classes
buffer.Advance(); // swallow (0, ENDSEC)
break;
}
if (pair.Code != 0)
{
throw new DxfReadException("Expected new class.", pair);
}
var cls = DxfClass.FromBuffer(buffer, version);
if (cls != null)
{
section.Classes.Add(cls);
}
}
return(section);
}
internal static DxfObjectsSection ObjectsSectionFromBuffer(DxfCodePairBufferReader buffer)
{
var objects = new List <DxfObject>();
objects.Clear();
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
if (DxfCodePair.IsSectionEnd(pair))
{
// done reading objects
buffer.Advance(); // swallow (0, ENDSEC)
break;
}
if (pair.Code != 0)
{
throw new DxfReadException("Expected new object.", pair);
}
var obj = DxfObject.FromBuffer(buffer);
if (obj != null)
{
objects.Add(obj);
}
}
var section = new DxfObjectsSection();
section.Objects.AddRange(objects);
return(section);
}
internal static void SwallowSection(DxfCodePairBufferReader buffer)
{
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
buffer.Advance();
if (DxfCodePair.IsSectionEnd(pair))
{
break;
}
}
}
internal static DxfHeaderSection HeaderSectionFromBuffer(DxfCodePairBufferReader buffer)
{
var section = new DxfHeaderSection();
string keyName = null;
Func <short, bool> shortToBool = value => value != 0;
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
buffer.Advance();
if (DxfCodePair.IsSectionEnd(pair))
{
// done reading settings
break;
}
if (pair.Code == 9)
{
// what setting to get
keyName = pair.StringValue;
}
else
{
section.Header.SetHeaderVariable(keyName, pair);
if (string.Compare(keyName, "$DWGCODEPAGE", StringComparison.OrdinalIgnoreCase) == 0 && section.Header.Version <= DxfAcadVersion.R2004)
{
// R2004 and before should honor the specified code page
if (DxfEncodingHelper.TryParseEncoding(pair.StringValue, out var codePage))
{
var encoding = Encoding.GetEncoding(codePage);
buffer.SetReaderEncoding(encoding);
}
}
else if (string.Compare(keyName, "$ACADVER", StringComparison.OrdinalIgnoreCase) == 0 && section.Header.Version >= DxfAcadVersion.R2007)
{
// R2007 and up should switch to a UTF8 reader
buffer.SetReaderEncoding(Encoding.UTF8);
}
}
}
return(section);
}
internal static DxfThumbnailImageSection ThumbnailImageSectionFromBuffer(DxfCodePairBufferReader buffer)
{
if (buffer.ItemsRemain)
{
var lengthPair = buffer.Peek();
buffer.Advance();
if (lengthPair.Code != 90)
{
return(null);
}
var length = lengthPair.IntegerValue;
var lines = new List <string>();
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
buffer.Advance();
if (DxfCodePair.IsSectionEnd(pair))
{
break;
}
Debug.Assert(pair.Code == 310);
lines.Add(pair.StringValue);
}
var section = new DxfThumbnailImageSection();
section.Clear();
section.RawData = DxfCommonConverters.HexBytes(string.Join(string.Empty, lines.ToArray()));
return(section);
}
return(null);
}
internal static DxfThumbnailImageSection ThumbnailImageSectionFromBuffer(DxfCodePairBufferReader buffer)
{
if (buffer.ItemsRemain)
{
var lengthPair = buffer.Peek();
buffer.Advance();
if (lengthPair.Code != 90)
{
return(null);
}
var length = lengthPair.IntegerValue;
var rawData = new List <byte>();
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
buffer.Advance();
if (DxfCodePair.IsSectionEnd(pair))
{
break;
}
Debug.Assert(pair.Code == 310);
rawData.AddRange(pair.BinaryValue);
}
var section = new DxfThumbnailImageSection();
section.Clear();
section.RawData = rawData.ToArray();
return(section);
}
return(null);
}
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 DxfTablesSection TablesSectionFromBuffer(DxfCodePairBufferReader buffer)
{
var section = new DxfTablesSection();
section.Clear();
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
buffer.Advance();
if (DxfCodePair.IsSectionEnd(pair))
{
break;
}
if (!IsTableStart(pair))
{
throw new DxfReadException("Expected start of table.", pair);
}
var table = DxfTable.FromBuffer(buffer);
if (table != null)
{
switch (table.TableType)
{
case DxfTableType.AppId:
section.AppIdTable = (DxfAppIdTable)table;
break;
case DxfTableType.BlockRecord:
section.BlockRecordTable = (DxfBlockRecordTable)table;
break;
case DxfTableType.DimStyle:
section.DimStyleTable = (DxfDimStyleTable)table;
break;
case DxfTableType.Layer:
section.LayerTable = (DxfLayerTable)table;
break;
case DxfTableType.LType:
section.LTypeTable = (DxfLTypeTable)table;
break;
case DxfTableType.Style:
section.StyleTable = (DxfStyleTable)table;
break;
case DxfTableType.Ucs:
section.UcsTable = (DxfUcsTable)table;
break;
case DxfTableType.View:
section.ViewTable = (DxfViewTable)table;
break;
case DxfTableType.ViewPort:
section.ViewPortTable = (DxfViewPortTable)table;
break;
default:
throw new DxfReadException($"Unexpected table type {table.TableType}", pair);
}
}
}
return(section);
}
