/// <summary> /// Deserializes the metadata (footer, properties, etc.) for this checkpoint file. /// </summary> private async Task ReadMetadataAsync() { Stream filestream = null; try { filestream = this.ReaderPool.AcquireStream(); // Read and validate the Footer section. The footer is always at the end of the stream, minus space for the checksum. var footerHandle = new BlockHandle(filestream.Length - FileFooter.SerializedSize - sizeof(ulong), FileFooter.SerializedSize); this.Footer = await FileBlock.ReadBlockAsync(filestream, footerHandle, (sectionReader, sectionHandle) => FileFooter.Read(sectionReader, sectionHandle)).ConfigureAwait(false); // Verify we know how to deserialize this version of the checkpoint file. if (this.Footer.Version != FileVersion) { throw new InvalidDataException(SR.Error_KeyCheckpointFile_Deserialized); } // Read and validate the Properties section. var propertiesHandle = this.Footer.PropertiesHandle; this.Properties = await FileBlock.ReadBlockAsync( filestream, propertiesHandle, (sectionReader, sectionHandle) => FilePropertySection.Read <KeyCheckpointFileProperties>(sectionReader, sectionHandle)).ConfigureAwait(false); } finally { this.ReaderPool.ReleaseStream(filestream, true); } }
/// <summary> /// Create a new key checkpoint file with the given filename. /// </summary> /// <param name="filename">Path to the checkpoint file.</param> /// <param name="fileId">File Id of the checkpoint file.</param> /// <param name="isValueAReferenceType"></param> public KeyCheckpointFile(string filename, uint fileId, bool isValueAReferenceType) : this(filename, isValueAReferenceType) { this.Properties = new KeyCheckpointFileProperties() { FileId = fileId, }; this.isValueAReferenceType = isValueAReferenceType; }