PDFBOX-5965: reset EOF if rewind is possible; improve test

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1924161 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

io/src/main/java/org/apache/pdfbox/io/NonSeekableRandomAccessReadInputStream.java

@@ -243,6 +243,7 @@ else if (bufferBytes[LAST] > 0)
             bufferBytes[LAST] = -1;
             currentBufferPointer = bufferBytes[CURRENT] - remainingBytesToRewind;
             position -= bytes;
+            isEOF = false;
         }
         else
         {

io/src/test/java/org/apache/pdfbox/io/NonSeekableRandomAccessReadInputStreamTest.java

@@ -152,6 +152,25 @@ void testPositionUnreadBytes() throws IOException
             assertEquals(7, randomAccessSource.getPosition());
             randomAccessSource.rewind(4);
             assertEquals(3, randomAccessSource.getPosition());
+
+            // PDFBOX-5965: check that it also works near EOF
+            assertEquals(3, randomAccessSource.read());
+            assertEquals(4, randomAccessSource.read());
+            assertEquals(5, randomAccessSource.read());
+            assertEquals(6, randomAccessSource.read());
+            assertEquals(7, randomAccessSource.read());
+            assertEquals(8, randomAccessSource.read());
+            assertEquals(9, randomAccessSource.read());
+            assertEquals(10, randomAccessSource.read());
+            assertEquals(-1, randomAccessSource.read());
+            assertTrue(randomAccessSource.isEOF());
+            randomAccessSource.rewind(4);
+            assertFalse(randomAccessSource.isEOF());
+            assertEquals(7, randomAccessSource.read());
+            assertEquals(8, randomAccessSource.read());
+            assertEquals(9, randomAccessSource.read());
+            assertEquals(10, randomAccessSource.read());
+            assertEquals(-1, randomAccessSource.read());
         }
     }