private bool IsOpenable(bool needToUncompress, bool needToLoadIntoMemory, out string message)
{
message = null;
if (this._originallyInArchive)
{
if (needToUncompress && this.CompressionMethod != ZipArchiveEntry.CompressionMethodValues.Stored && this.CompressionMethod != ZipArchiveEntry.CompressionMethodValues.Deflate)
{
message = CompressionConstants.UnsupportedCompression;
return(false);
}
if ((long)this._diskNumberStart != (long)this._archive.NumberOfThisDisk)
{
message = CompressionConstants.SplitSpanned;
return(false);
}
if (this._offsetOfLocalHeader > this._archive.ArchiveStream.Length)
{
message = CompressionConstants.LocalFileHeaderCorrupt;
return(false);
}
this._archive.ArchiveStream.Seek(this._offsetOfLocalHeader, SeekOrigin.Begin);
if (!ZipLocalFileHeader.TrySkipBlock(this._archive.ArchiveReader))
{
message = CompressionConstants.LocalFileHeaderCorrupt;
return(false);
}
if (this.OffsetOfCompressedData + this._compressedSize > this._archive.ArchiveStream.Length)
{
message = CompressionConstants.LocalFileHeaderCorrupt;
return(false);
}
if (needToLoadIntoMemory && this._compressedSize > (long)int.MaxValue)
{
message = CompressionConstants.EntryTooLarge;
return(false);
}
}
return(true);
}
internal bool LoadLocalHeaderExtraFieldAndCompressedBytesIfNeeded()
{
if (this._originallyInArchive)
{
this._archive.ArchiveStream.Seek(this._offsetOfLocalHeader, SeekOrigin.Begin);
this._lhUnknownExtraFields = ZipLocalFileHeader.GetExtraFields(this._archive.ArchiveReader);
}
if (!this._everOpenedForWrite && this._originallyInArchive)
{
this._compressedBytes = new byte[this._compressedSize];
this._archive.ArchiveStream.Seek(this.OffsetOfCompressedData, SeekOrigin.Begin);
ZipHelper.ReadBytes(this._archive.ArchiveStream, this._compressedBytes, (int)this._compressedSize);
}
return(true);
}