1 files changed, 71 insertions, 0 deletions

diff --git a/java/com/xagasoft/gats/Integer.java b/java/com/xagasoft/gats/Integer.java
new file mode 100644
index 0000000..7da12d4
--- /dev/null
+++ b/java/com/xagasoft/gats/Integer.java
@@ -0,0 +1,71 @@
+package com.xagasoft.gats;
+
+import java.io.OutputStream;
+import java.io.InputStream;
+
+public class Integer extends Type
+{
+        public int getType()
+        {
+                return Type.INTEGER;
+        };
+
+        /**
+         * Possible TODO: have this return a Number, and construct either a Long
+         * or BigInteger when appropriate.
+         */
+        public static long readPackedInt( InputStream is )
+                throws java.io.IOException
+        {
+                int b;
+                long rOut = 0;
+                boolean bNeg;
+                
+                b = is.read();
+                bNeg = (b&0x40) == 0x40;
+                rOut |= b&0x3F;
+                int c = 0;
+                while( (b&0x80) == 0x80 )
+                {
+                        b = is.read();
+                        rOut |= (long)(b&0x7F) << (6+7*(c++));
+                }
+                if( bNeg )
+                        return -rOut;
+                return rOut;
+        }
+
+        public static void writePackedInt( OutputStream os, long iIn )
+                throws java.io.IOException
+        {
+                int b;
+
+                if( iIn < 0 )
+                {
+                        iIn = -iIn;
+                        b = (int)(iIn&0x3F);
+                        if( iIn > b )
+                                b |= 0x80 | 0x40;
+                        else
+                                b |= 0x40;
+                }
+                else
+                {
+                        b = (int)(iIn&0x3F);
+                        if( iIn > b )
+                                b |= 0x80;
+                }
+                os.write( b );
+                iIn = iIn >> 6;
+
+                while( iIn > 0 )
+                {
+                        b = (int)(iIn&0x7F);
+                        if( iIn > b )
+                                b |= 0x80;
+                        os.write( b );
+                        iIn = iIn >> 7;
+                }
+        }
+};
+