Merge branch 'Jalview-JS/develop' into merge/Ben_trying_out_JSdevelop_with_develop

[jalview.git] / unused / javajs / util / CompoundDocHeader.java

diff --git a/unused/javajs/util/CompoundDocHeader.java b/unused/javajs/util/CompoundDocHeader.java
new file mode 100644 (file)
index 0000000..72317fe
--- /dev/null
+++ b/unused/javajs/util/CompoundDocHeader.java
@@ -0,0 +1,115 @@
+/* $RCSfile$
+ * $Author$
+ * $Date$
+ * $Revision$
+ *
+ * Some portions of this file have been modified by Robert Hanson hansonr.at.stolaf.edu 2012-2017
+ * for use in SwingJS via transpilation into JavaScript using Java2Script.
+ *
+ * Copyright (C) 2011  The Jmol Development Team
+ *
+ * Contact: jmol-developers@lists.sf.net
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ *  02110-1301, USA.
+ */
+
+package javajs.util;
+
+
+class CompoundDocHeader {
+
+  /**
+   * 
+   */
+  private final CompoundDocument cd;
+
+  /**
+   * @param compoundDocument
+   */
+  CompoundDocHeader(CompoundDocument compoundDocument) {
+    cd = compoundDocument;
+  }
+
+  //512 bytes
+  //offset 0:
+  byte[] magicNumbers = new byte[8]; // D0CF11E0A1B11AE1
+  byte[] uniqueID16 = new byte[16];
+  byte revNumber; // 3E = 62
+  //byte unusedb1;
+  byte verNumber; // 3
+  //byte unusedb2;
+  //short byteOrder; // -2 littleEndian
+  short sectorPower; // 2^sectorPower = sector size; 512 = 2^9
+  short shortSectorPower; // 2^shortSectorPower = short sector size; 64 = 2^6
+  byte[] unused = new byte[10];
+  int nSATsectors; // number of sectors for sector allocation table
+  int SID_DIR_start; // sector identifier of start of directory sector
+  //offset 56:
+  int minBytesStandardStream; // less than this (and not DIR) will be "short"
+  int SID_SSAT_start; // start of short sector allocation table (SSAT)
+  int nSSATsectors; // number of sectors allocated to SSAT
+  int SID_MSAT_next; // pointer to next master sector allocation table sector
+  int nAdditionalMATsectors; // number of sectors allocated to more MSAT sectors
+  //offset 76; 436 bytes:      
+  int[] MSAT0 = new int[109]; // beginning of master allocation table 
+
+  /*
+   *  Sector 0 is first sector AFTER this header
+   *  
+   *  If sectorPower = 9, then this allows for 109 PAGES
+   *  of sector allocation tables, with 127 pointers per
+   *  page (plus 1 pointer to the next SAT page), each 
+   *  pointing to a sector of 512 bytes. Thus, with no additional
+   *  MSAT pages, the header allows for 109*128*512 = 7.1 Mb file
+   *  
+   */
+
+  final boolean readData() {
+    try {
+      cd.readByteArray(magicNumbers, 0, 8);
+      if ((magicNumbers[0] & 0xFF) != 0xD0 || (magicNumbers[1] & 0xFF) != 0xCF
+          || (magicNumbers[2] & 0xFF) != 0x11 || (magicNumbers[3] & 0xFF) != 0xE0
+          || (magicNumbers[4] & 0xFF) != 0xA1 || (magicNumbers[5] & 0xFF) != 0xB1
+          || (magicNumbers[6] & 0xFF) != 0x1A || (magicNumbers[7] & 0xFF) != 0xE1)
+        return false;
+      cd.readByteArray(uniqueID16, 0, 16);
+      revNumber = cd.readByte();
+      cd.readByte();
+      verNumber = cd.readByte();
+      cd.readByte();
+      byte b1 = cd.readByte();
+      byte b2 = cd.readByte();
+      cd.isBigEndian = (b1 == -1 && b2 == -2);
+      sectorPower = cd.readShort();
+      shortSectorPower = cd.readShort();
+      cd.readByteArray(unused, 0, 10);
+      nSATsectors = cd.readInt();
+      SID_DIR_start = cd.readInt();
+      cd.readByteArray(unused, 0, 4);
+      minBytesStandardStream = cd.readInt();
+      SID_SSAT_start = cd.readInt();
+      nSSATsectors = cd.readInt();
+      SID_MSAT_next = cd.readInt();
+      nAdditionalMATsectors = cd.readInt();
+      for (int i = 0; i < 109; i++)
+        MSAT0[i] = cd.readInt();
+    } catch (Exception e) {
+      System.out.println(e.toString());
+      return false;
+    }
+    return true;
+  }
+}
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