Author: bayard
Date: Fri May 18 16:37:59 2007
New Revision: 539632
URL: http://svn.apache.org/viewvc?view=rev&rev=539632
Log:
Applying Hiroshi's test from IO-117 with my fix. Fixes negative number
possibilities in EndianUtils.readSwappedUnsignedInteger()
Modified:
jakarta/commons/proper/io/trunk/src/java/org/apache/commons/io/EndianUtils.java
jakarta/commons/proper/io/trunk/src/test/org/apache/commons/io/EndianUtilsTest.java
Modified:
jakarta/commons/proper/io/trunk/src/java/org/apache/commons/io/EndianUtils.java
URL:
http://svn.apache.org/viewvc/jakarta/commons/proper/io/trunk/src/java/org/apache/commons/io/EndianUtils.java?view=diff&rev=539632&r1=539631&r2=539632
==============================================================================
---
jakarta/commons/proper/io/trunk/src/java/org/apache/commons/io/EndianUtils.java
(original)
+++
jakarta/commons/proper/io/trunk/src/java/org/apache/commons/io/EndianUtils.java
Fri May 18 16:37:59 2007
@@ -182,10 +182,13 @@
* @return the value read
*/
public static long readSwappedUnsignedInteger(byte[] data, int offset) {
- return ( ( ( data[ offset + 0 ] & 0xff ) << 0 ) +
- ( ( data[ offset + 1 ] & 0xff ) << 8 ) +
- ( ( data[ offset + 2 ] & 0xff ) << 16 ) +
- ( ( data[ offset + 3 ] & 0xff ) << 24 ) );
+ long low = ( ( ( data[ offset + 0 ] & 0xff ) << 0 ) +
+ ( ( data[ offset + 1 ] & 0xff ) << 8 ) +
+ ( ( data[ offset + 2 ] & 0xff ) << 16 ) );
+
+ long high = data[ offset + 3 ] & 0xff;
+
+ return (high << 24) + (0xffffffffL & low);
}
/**
@@ -368,10 +371,13 @@
int value3 = read( input );
int value4 = read( input );
- return ( ( value1 & 0xff ) << 0 ) +
- ( ( value2 & 0xff ) << 8 ) +
- ( ( value3 & 0xff ) << 16 ) +
- ( ( value4 & 0xff ) << 24 );
+ long low = ( ( ( value1 & 0xff ) << 0 ) +
+ ( ( value2 & 0xff ) << 8 ) +
+ ( ( value3 & 0xff ) << 16 ) );
+
+ long high = value4 & 0xff;
+
+ return (high << 24) + (0xffffffffL & low);
}
/**
Modified:
jakarta/commons/proper/io/trunk/src/test/org/apache/commons/io/EndianUtilsTest.java
URL:
http://svn.apache.org/viewvc/jakarta/commons/proper/io/trunk/src/test/org/apache/commons/io/EndianUtilsTest.java?view=diff&rev=539632&r1=539631&r2=539632
==============================================================================
---
jakarta/commons/proper/io/trunk/src/test/org/apache/commons/io/EndianUtilsTest.java
(original)
+++
jakarta/commons/proper/io/trunk/src/test/org/apache/commons/io/EndianUtilsTest.java
Fri May 18 16:37:59 2007
@@ -263,4 +263,17 @@
}
}
+ // tests #IO-117
+ public void testUnsignedOverrun() throws Exception {
+ byte[] target = new byte[] { 0, 0, 0, (byte)0x80 };
+ long expected = 0x80000000L;
+
+ long actual = EndianUtils.readSwappedUnsignedInteger(target, 0);
+ assertEquals("readSwappedUnsignedInteger(byte[], int) was incorrect",
expected, actual);
+
+ ByteArrayInputStream in = new ByteArrayInputStream(target);
+ actual = EndianUtils.readSwappedUnsignedInteger(in);
+ assertEquals("readSwappedUnsignedInteger(InputStream) was incorrect",
expected, actual);
+ }
+
}
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