static Package OpenCore(Stream stream, FileMode packageMode, FileAccess packageAccess, bool ownsStream)
{
if ((packageAccess & FileAccess.Read) == FileAccess.Read && !stream.CanRead)
{
throw new IOException("Stream does not support reading");
}
if ((packageAccess & FileAccess.Write) == FileAccess.Write && !stream.CanWrite)
{
throw new IOException("Stream does not support reading");
}
if (!stream.CanSeek)
{
throw new ArgumentException("stream", "Stream must support seeking");
}
if (packageMode == FileMode.Open && stream.Length == 0)
{
throw new FileFormatException("Stream length cannot be zero with FileMode.Open");
}
if (packageMode == FileMode.CreateNew && stream.Length > 0)
{
throw new IOException("Cannot use CreateNew when stream contains data");
}
if (packageMode == FileMode.Append || packageMode == FileMode.Truncate)
{
if (stream.CanWrite)
{
throw new NotSupportedException(string.Format("PackageMode.{0} is not supported", packageMode));
}
else
{
throw new IOException(string.Format("PackageMode.{0} is not supported", packageMode));
}
}
// Test to see if archive is valid
if (stream.Length > 0 && packageAccess == FileAccess.Read)
{
try
{
using (zipsharp.UnzipArchive a = new zipsharp.UnzipArchive(stream))
{
}
}
catch
{
throw new FileFormatException("The specified archive is invalid.");
}
}
return(new ZipPackage(packageAccess, ownsStream, stream));
}
static Package OpenCore (Stream stream, FileMode packageMode, FileAccess packageAccess)
{
if ((packageAccess & FileAccess.Read) == FileAccess.Read && !stream.CanRead)
throw new IOException ("Stream does not support reading");
if ((packageAccess & FileAccess.Write) == FileAccess.Write && !stream.CanWrite)
throw new IOException ("Stream does not support reading");
if (!stream.CanSeek)
throw new ArgumentException ("stream", "Stream must support seeking");
if (packageMode == FileMode.Open && stream.Length == 0)
throw new FileFormatException("Stream length cannot be zero with FileMode.Open");
if (packageMode == FileMode.CreateNew && stream.Length > 0)
throw new IOException ("Cannot use CreateNew when stream contains data");
if (packageMode == FileMode.Append || packageMode == FileMode.Truncate)
{
if (stream.CanWrite)
throw new NotSupportedException (string.Format("PackageMode.{0} is not supported", packageMode));
else
throw new IOException (string.Format("PackageMode.{0} is not supported", packageMode));
}
// Test to see if archive is valid
if (stream.Length > 0 && packageAccess == FileAccess.Read) {
try {
using (zipsharp.UnzipArchive a = new zipsharp.UnzipArchive (stream)) {
}
} catch {
throw new FileFormatException ("The specified archive is invalid.");
}
}
return new ZipPackage (packageAccess, stream);
}
