/// <summary>
/// Create a new LocalFileHeader
/// </summary>
/// <param name="fileName"></param>
/// <param name="encoding"></param>
/// <param name="compressionMethod"></param>
/// <param name="deflateOption"></param>
/// <param name="streaming">true if in streaming mode</param>
/// <returns></returns>
internal static ZipIOLocalFileHeader CreateNew(string fileName, Encoding encoding,
CompressionMethodEnum compressionMethod, DeflateOptionEnum deflateOption, bool streaming)
{
//this should be ensured by the higher levels
Debug.Assert(Enum.IsDefined(typeof(CompressionMethodEnum), compressionMethod));
Debug.Assert(Enum.IsDefined(typeof(DeflateOptionEnum), deflateOption));
byte[] asciiName = encoding.GetBytes(fileName);
if (asciiName.Length > ZipIOBlockManager.MaxFileNameSize)
{
throw new ArgumentOutOfRangeException("fileName");
}
ZipIOLocalFileHeader header = new ZipIOLocalFileHeader();
header._signature = ZipIOLocalFileHeader._signatureConstant;
header._compressionMethod = (ushort)compressionMethod;
if (streaming)
{
header._versionNeededToExtract = (UInt16)ZipIOVersionNeededToExtract.Zip64FileFormat;
}
else
{
header._versionNeededToExtract = (UInt16)ZipIOBlockManager.CalcVersionNeededToExtractFromCompression(
compressionMethod);
}
if (compressionMethod != CompressionMethodEnum.Stored)
{
Debug.Assert(deflateOption != DeflateOptionEnum.None); //this should be ensured by the higher levels
header.DeflateOption = deflateOption;
}
if (streaming)
{
// set bit 3
header.StreamingCreationFlag = true;
}
header._lastModFileDateTime = ZipIOBlockManager.ToMsDosDateTime(DateTime.Now);
header._fileNameLength = (UInt16)asciiName.Length;
header._fileName = asciiName;
header._extraField = ZipIOExtraField.CreateNew(!streaming /* creating padding if it is not in streaming creation mode */);
header._extraFieldLength = header._extraField.Size;
//populate frequently used field with user friendly data representations
header._stringFileName = fileName;
return(header);
}
internal static ZipIOCentralDirectoryFileHeader CreateNew(Encoding encoding, ZipIOLocalFileBlock fileBlock)
{
ZipIOCentralDirectoryFileHeader header = new ZipIOCentralDirectoryFileHeader(encoding);
// initialize fields that are not duplicated in the local file block(header)
header._fileCommentLength = 0;
header._fileComment = null;
header._diskNumberStart = 0;
header._internalFileAttributes = 0;
header._externalFileAttributes = 0;
header._versionMadeBy = (ushort)ZipIOVersionNeededToExtract.Zip64FileFormat;
header._extraField = ZipIOExtraField.CreateNew(false /* no padding */);
// update the rest of the fields based on the local file header
header.UpdateFromLocalFileBlock(fileBlock);
return(header);
}
