garydgregory commented on code in PR #457:
URL: https://github.com/apache/commons-io/pull/457#discussion_r1223704062
##########
src/test/java/org/apache/commons/io/FileUtilsTest.java:
##########
@@ -2446,6 +2447,56 @@ public void testReadFileToByteArray() throws Exception {
assertEquals(31, data[2]);
}
+ @Test
+ public void testReadFileToByteArrayOffsetAndLength() throws Exception {
+ final File file = new File(tempDirFile, "read.txt");
+ final byte[] arr = new byte[] {10, 20, 30, 40 ,50, 60, 70};
+ Files.write(file.toPath(), arr);
+
+ final byte[] data = FileUtils.readFileToByteArray(file, 2, 5);
+ assertEquals(4, data.length);
+ assertEquals(30, data[0]); // arrayOffSet
+ assertEquals(60, data[3]); // arrayLength
+ }
+
+ @Test
+ public void testReadFileToByteArrayOffsetAndLengthSameValue() throws
Exception {
+ final File file = new File(tempDirFile, "read.txt");
+ final byte[] arr = new byte[] {10, 20, 30, 40 ,50, 60, 70};
+ Files.write(file.toPath(), arr);
+
+ final byte[] data = FileUtils.readFileToByteArray(file, 2, 2);
+ assertEquals(1, data.length);
+ assertEquals(30, data[0]); // return one byte
+ }
+
+ @Test
+ public void testReadFileToByteArrayOffsetAndLengthZero() throws Exception {
+ final File file = new File(tempDirFile, "read.txt");
+ final byte[] arr = new byte[] {10, 20, 30, 40 ,50, 60, 70};
+ Files.write(file.toPath(), arr);
+
+ final byte[] data = FileUtils.readFileToByteArray(file, 0, 0);
+ assertEquals(0, data.length);// return one byte
Review Comment:
The comment is wrong: How is length zero equal to one byte?
##########
src/test/java/org/apache/commons/io/FileUtilsTest.java:
##########
@@ -2446,6 +2447,56 @@ public void testReadFileToByteArray() throws Exception {
assertEquals(31, data[2]);
}
+ @Test
+ public void testReadFileToByteArrayOffsetAndLength() throws Exception {
+ final File file = new File(tempDirFile, "read.txt");
+ final byte[] arr = new byte[] {10, 20, 30, 40 ,50, 60, 70};
+ Files.write(file.toPath(), arr);
+
+ final byte[] data = FileUtils.readFileToByteArray(file, 2, 5);
+ assertEquals(4, data.length);
+ assertEquals(30, data[0]); // arrayOffSet
+ assertEquals(60, data[3]); // arrayLength
+ }
+
+ @Test
+ public void testReadFileToByteArrayOffsetAndLengthSameValue() throws
Exception {
+ final File file = new File(tempDirFile, "read.txt");
+ final byte[] arr = new byte[] {10, 20, 30, 40 ,50, 60, 70};
+ Files.write(file.toPath(), arr);
+
+ final byte[] data = FileUtils.readFileToByteArray(file, 2, 2);
+ assertEquals(1, data.length);
+ assertEquals(30, data[0]); // return one byte
+ }
+
+ @Test
+ public void testReadFileToByteArrayOffsetAndLengthZero() throws Exception {
+ final File file = new File(tempDirFile, "read.txt");
+ final byte[] arr = new byte[] {10, 20, 30, 40 ,50, 60, 70};
+ Files.write(file.toPath(), arr);
+
+ final byte[] data = FileUtils.readFileToByteArray(file, 0, 0);
+ assertEquals(0, data.length);// return one byte
+ }
+
+
+ @Test()
+ public void testReadFileToByteArrayOffsetAndLengthException() {
+
+ final File file = new File(tempDirFile, "read.txt");
+ final byte[] arr = new byte[] {10, 20, 30, 40, 50, 60, 70};
+
+ try {
+ Files.write(file.toPath(), arr);
+ FileUtils.readFileToByteArray(file, 2, 1);
+ } catch (IOException | IllegalArgumentException ex) {
+ assertEquals("Length must be greater than or equal to offset: " +
2, ex.getMessage());
Review Comment:
This makes no sense to me: the position and length should not be related;
"2, 1" should mean, starting at 0-based position 2, read one byte. IOW, I am
describing the same semantics as 'java.io.InputStream.read(byte[], int, int)'.
In this test, the file is 7 bytes in length, so "2, 1", should return the third
byte value of "30".
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