public void AddChild(PowerPointRecord entry)
{
if (this._children == null)
{
this._children = new List <PowerPointRecord>();
}
this._children.Add(entry);
}
private PowerPointRecord GetRecord(PowerPointRecord parent)
{
if (this._contentStream.Position + 8 >= this._contentStream.Length)
{
return(null);
}
UInt16 version = this._contentReader.ReadUInt16();
UInt16 type = this._contentReader.ReadUInt16();
UInt32 length = this._contentReader.ReadUInt32();
return(new PowerPointRecord(parent, version, type, length, this._contentStream.Position));
}
/// <summary>
/// 初始化新的Record
/// </summary>
/// <param name="parent">父节点</param>
/// <param name="version">RecordVersion和Instance</param>
/// <param name="type">Record类型</param>
/// <param name="length">Record内容大小</param>
/// <param name="offset">Record相对PowerPoint Document偏移</param>
public PowerPointRecord(PowerPointRecord parent, UInt16 version, UInt16 type, UInt32 length, Int64 offset)
{
this._recVer = (UInt16)(version & 0xF);
this._recInstance = (UInt16)(version & 0xFFF0);
this._recType = (RecordType)type;
this._recLen = length;
this._offset = offset;
this._deepth = (parent == null ? 0 : parent._deepth + 1);
this._parent = parent;
if (_recVer == 0xF)
{
this._children = new List <PowerPointRecord>();
}
}
protected override void ReadContent()
{
DirectoryEntry entry = this._dirRootEntry.GetChild("PowerPoint Document");
if (entry == null)
{
return;
}
try
{
this._contentStream = new MemoryStream(this._entryData[entry.EntryID]);
this._contentReader = new BinaryReader(this._contentStream);
#region 测试方法
this._recordTree = new StringBuilder();
#endregion
this._allText = new StringBuilder();
this._records = new List <PowerPointRecord>();
PowerPointRecord record = null;
while (this._contentStream.Position < this._contentStream.Length)
{
record = this.ReadRecord(null);
if (record == null || record.RecordType == 0)
{
break;
}
}
this._allText = new StringBuilder(StringHelper.ReplaceString(this._allText.ToString()));
}
finally
{
if (this._contentReader != null)
{
this._contentReader.Close();
}
if (this._contentStream != null)
{
this._contentStream.Close();
}
}
}
private PowerPointRecord ReadRecord(PowerPointRecord parent)
{
PowerPointRecord record = GetRecord(parent);
if (record == null)
{
return(null);
}
#region 测试方法
else
{
this._recordTree.Append('-', record.Deepth * 2);
this._recordTree.AppendFormat("[{0}]-[{1}]-[Len:{2}]", record.RecordType, record.Deepth, record.RecordLength);
this._recordTree.AppendLine();
}
#endregion
if (parent == null)
{
this._records.Add(record);
}
else
{
parent.AddChild(record);
}
if (record.RecordVersion == 0xF)
{
while (this._contentStream.Position < record.Offset + record.RecordLength)
{
this.ReadRecord(record);
}
}
else
{
if (record.Parent != null && (
record.Parent.RecordType == RecordType.ListWithTextContainer ||
record.Parent.RecordType == RecordType.HeadersFootersContainer ||
(UInt32)record.Parent.RecordType == 0xF00D))
{
if (record.RecordType == RecordType.TextCharsAtom || record.RecordType == RecordType.CString)//找到Unicode双字节文字内容
{
Byte[] data = this._contentReader.ReadBytes((Int32)record.RecordLength);
this._allText.Append(StringHelper.GetString(true, data));
this._allText.AppendLine();
}
else if (record.RecordType == RecordType.TextBytesAtom)//找到Unicode<256单字节文字内容
{
Byte[] data = this._contentReader.ReadBytes((Int32)record.RecordLength);
this._allText.Append(StringHelper.GetString(false, data));
this._allText.AppendLine();
}
else
{
this._contentStream.Seek(record.RecordLength, SeekOrigin.Current);
}
}
else
{
if (this._contentStream.Position + record.RecordLength < this._contentStream.Length)
{
this._contentStream.Seek(record.RecordLength, SeekOrigin.Current);
}
else
{
this._contentStream.Seek(0, SeekOrigin.End);
}
}
}
return(record);
}
