bool DoRead(Stream stream)
{
if (stream.Length < _metadataTable.MinLength + SegmentLength)
{
return(false); // 虽然插件数据文件存在，但并未包含有效的数据
}
// 1. 读取各个分段的长度
stream.Position = stream.Length - SegmentLength;
var addinRecordSegmentLength = stream.ReadInt64();
var addinMetadataSegmentLength = stream.ReadInt64();
var invalidAddinFilePacksSegmentLength = stream.ReadInt64();
var dataSegmentLength = stream.ReadInt64();
if (dataSegmentLength + SegmentLength != stream.Length)
{
return(false); // 插件数据文件已被破坏，返回 false 以便让系统重新解析插件
}
// 2. 读取 AddinMetadata 分段 (AddinMetadataTable)
stream.Position = addinRecordSegmentLength; // 指针指向 AddinMetadata 分段 (AddinMetadataTable) 的起始位置
var hasAddins = _metadataTable.Read(stream);
if (!hasAddins || _metadataTable.AddinCount == 0)
{
return(false); // 虽然插件数据文件存在，但并未包含有效的数据
}
// 3. 根据 AddinMetadata 读取 AddinRecord 分段，并进行验证
foreach (var metadata in _metadataTable.Addins)
{
stream.Position = metadata.Position;
var addin = new AddinRecord(metadata);
addin.Read(stream);
if (stream.Position - metadata.Position != metadata.Length || addin.Uid != metadata.AddinUid)
{
return(false); // 插件数据文件已被破坏，返回 false 以便让系统重新解析插件
}
_addinRecords.Add(addin);
}
// 4. 读取 InvalidAddinFilePack 分段
stream.Position = addinRecordSegmentLength + addinMetadataSegmentLength; // 指针指向 InvalidAddinFilePack 分段的起始位置
_invalidAddinFilePacks = RecordHelpers.Read(stream, ref AddinFilePack.Factory);
if (stream.Position - (addinRecordSegmentLength + addinMetadataSegmentLength) != invalidAddinFilePacksSegmentLength)
{
return(false); // 插件数据文件已被破坏，返回 false 以便让系统重新解析插件
}
// 5. 读取 Uid 分段
stream.Position = addinRecordSegmentLength + addinMetadataSegmentLength + invalidAddinFilePacksSegmentLength; // 指针指向 Uid 分段的起始位置
UidStorage.Read(stream);
return(true);
}
public void Read(Stream reader)
{
//OperationStatus = (AddinOperationStatus)reader.ReadSByte();
_addinHeader.Read(reader);
_addinFilePack.Read(reader);
var activatorIsNull = reader.ReadBoolean();
if (!activatorIsNull)
{
_addinActivator = new AddinActivatorRecord();
_addinActivator.Read(reader);
}
//_referencedApplicationAssemblies = RecordHelpers.Read(reader, ref ReferencedApplicationAssemblyRecord.Factory);
_referencedAssemblies = RecordHelpers.Read(reader, ref ReferencedAssemblyRecord.Factory);
_extendedAddins = RecordHelpers.Read(reader, ref ExtendedAddinRecord.Factory);
_extendedExtensionPoints = RecordHelpers.Read(reader);
_extensionPoints = RecordHelpers.Read(reader, ref ExtensionPointRecord.Factory);
_ebRecordGroups = RecordHelpers.Read(reader, ref ExtensionBuilderRecordGroup.Factory);
_exRecordGroups = RecordHelpers.Read(reader, ref ExtensionRecordGroup.Factory);
}
