better pascal TEXT handling

src/com/bytezone/diskbrowser/applefile/PascalText.java

@@ -4,6 +4,8 @@ package com.bytezone.diskbrowser.applefile;
 public class PascalText extends TextFile
 // -----------------------------------------------------------------------------------//
 {
+  private final static int PAGE_SIZE = 1024;
+
   // ---------------------------------------------------------------------------------//
   public PascalText (String name, byte[] buffer)
   // ---------------------------------------------------------------------------------//
@@ -16,28 +18,34 @@ public class PascalText extends TextFile
   public String getText ()
   // ---------------------------------------------------------------------------------//
   {
+    // Text files are broken up into 1024-byte pages.
+    //    [DLE] [indent] [text] [CR] ... [nulls]
+
     StringBuilder text = new StringBuilder (getHeader ());
 
-    int ptr = 0x400;
+    int ptr = PAGE_SIZE;                                // skip text editor header
+
     while (ptr < buffer.length)
     {
-      if (buffer[ptr] == 0x00)
+      if (buffer[ptr] == 0x00)                          // padding to page boundary
       {
-        ++ptr;
+        ptr = (ptr / PAGE_SIZE + 1) * PAGE_SIZE;        // skip to next page
         continue;
       }
 
-      if (buffer[ptr] == 0x10)
+      if (buffer[ptr] == 0x10)                          // Data Link Escape code
       {
-        int tab = buffer[ptr + 1] - 0x20;
+        int tab = (buffer[ptr + 1] & 0xFF) - 32;        // indent amaount
         while (tab-- > 0)
           text.append (" ");
         ptr += 2;
       }
 
-      String line = getLine (ptr);
-      text.append (line + "\n");
-      ptr += line.length () + 1;
+      while (buffer[ptr] != 0x0D)
+        text.append ((char) buffer[ptr++]);
+
+      text.append ("\n");
+      ptr++;
     }
 
     if (text.length () > 0)
@@ -45,16 +53,4 @@ public class PascalText extends TextFile
 
     return text.toString ();
   }
-
-  // ---------------------------------------------------------------------------------//
-  private String getLine (int ptr)
-  // ---------------------------------------------------------------------------------//
-  {
-    StringBuilder line = new StringBuilder ();
-
-    while (buffer[ptr] != 0x0D)
-      line.append ((char) buffer[ptr++]);
-
-    return line.toString ();
-  }
 }