internal static ZipIOCentralDirectoryFileHeader ParseRecord(BinaryReader reader, Encoding encoding)
{
ZipIOCentralDirectoryFileHeader header = new ZipIOCentralDirectoryFileHeader(encoding);
header._signature = reader.ReadUInt32();
header._versionMadeBy = reader.ReadUInt16();
header._versionNeededToExtract = reader.ReadUInt16();
header._generalPurposeBitFlag = reader.ReadUInt16();
header._compressionMethod = reader.ReadUInt16();
header._lastModFileDateTime = reader.ReadUInt32();
header._crc32 = reader.ReadUInt32();
header._compressedSize = reader.ReadUInt32();
header._uncompressedSize = reader.ReadUInt32();
header._fileNameLength = reader.ReadUInt16();
header._extraFieldLength = reader.ReadUInt16();
header._fileCommentLength = reader.ReadUInt16();
header._diskNumberStart = reader.ReadUInt16();
header._internalFileAttributes = reader.ReadUInt16();
header._externalFileAttributes = reader.ReadUInt32();
header._relativeOffsetOfLocalHeader = reader.ReadUInt32();
header._fileName = reader.ReadBytes(header._fileNameLength);
// check for the ZIP 64 version and escaped values
ZipIOZip64ExtraFieldUsage zip64extraFieldUsage = ZipIOZip64ExtraFieldUsage.None;
if (header._versionNeededToExtract >= (ushort)ZipIOVersionNeededToExtract.Zip64FileFormat)
{
if (header._compressedSize == UInt32.MaxValue)
{
zip64extraFieldUsage |= ZipIOZip64ExtraFieldUsage.CompressedSize;
}
if (header._uncompressedSize == UInt32.MaxValue)
{
zip64extraFieldUsage |= ZipIOZip64ExtraFieldUsage.UncompressedSize;
}
if (header._relativeOffsetOfLocalHeader == UInt32.MaxValue)
{
zip64extraFieldUsage |= ZipIOZip64ExtraFieldUsage.OffsetOfLocalHeader;
}
if (header._diskNumberStart == UInt16.MaxValue)
{
zip64extraFieldUsage |= ZipIOZip64ExtraFieldUsage.DiskNumber;
}
}
// if the ZIP 64 record is missing the zip64extraFieldUsage value will be ignored
header._extraField = ZipIOExtraField.ParseRecord(reader,
zip64extraFieldUsage,
header._extraFieldLength);
header._fileComment = reader.ReadBytes(header._fileCommentLength);
//populate frequently used field with user friendly data representations
header._stringFileName = ZipIOBlockManager.ValidateNormalizeFileName(encoding.GetString(header._fileName));
header.Validate();
return(header);
}