Add PKZIP archive model

PKZIP/Archive.cs

@@ -0,0 +1,71 @@
+namespace SabreTools.Models.PKZIP
+{
+    /// <summary>
+    /// Represents a single ZIP/ZIP64 archive
+    /// </summary>
+    public class Archive
+    {
+        #region Entries, Interleaved
+
+        /// <summary>
+        /// Local file headers, always appear first in each group
+        /// </summary>
+        public LocalFileHeader[]? LocalFileHeaders { get; set; }
+
+        /// <summary>
+        /// Encryption headers, may appear second in each group
+        /// </summary>
+        /// TODO: Determine the model for the encryption headers
+        public byte[]?[]? EncryptionHeaders { get; set; }
+
+        /// <summary>
+        /// File data, appears after the encryption header
+        /// if it exists or after the local file header otherwise
+        /// </summary>
+        public byte[][]? FileData { get; set; }
+
+        /// <summary>
+        /// Data descriptors, appears after the file data
+        /// </summary>
+        public DataDescriptor?[]? DataDescriptors { get; set; }
+
+        /// <summary>
+        /// ZIP64 Data descriptors, appears after the file data
+        /// </summary>
+        public DataDescriptor64?[]? ZIP64DataDescriptors { get; set; }
+
+        #endregion
+
+        /// <summary>
+        /// Optional archive decryption header, appears after all entries
+        /// </summary>
+        /// TODO: Determine the model
+        public byte[]? ArchiveDecryptionHeader { get; set; }
+
+        /// <summary>
+        /// Optional archive extra data record, appears after either
+        /// the archive decryption header or after all entries
+        /// </summary>
+        public ArchiveExtraDataRecord? ArchiveExtraDataRecord { get; set; }
+
+        /// <summary>
+        /// Central directory headers in sequential order
+        /// </summary>
+        public CentralDirectoryFileHeader[]? CentralDirectoryHeaders { get; set; }
+
+        /// <summary>
+        /// Optional ZIP64 end of central directory record
+        /// </summary>
+        public EndOfCentralDirectoryRecord64? ZIP64EndOfCentralDirectoryRecord { get; set; }
+
+        /// <summary>
+        /// Optional ZIP64 end of central directory locator
+        /// </summary>
+        public EndOfCentralDirectoryLocator64? ZIP64EndOfCentralDirectoryLocator { get; set; }
+
+        /// <summary>
+        /// Required end of central directory record, always must be last
+        /// </summary>
+        public EndOfCentralDirectoryRecord? EndOfCentralDirectoryRecord { get; set; }
+    }
+}