Reading a PNG file fails because of WBMPImageReaderSpi.canDecodeInput()

FULL PRODUCT VERSION :
java version " 1.7.0_25 "
Java(TM) SE Runtime Environment (build 1.7.0_25-b15)
Java HotSpot(TM) 64-Bit Server VM (build 23.25-b01, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64

A DESCRIPTION OF THE PROBLEM :
While inspecting PNG header, com.sun.imageio.plugins.wbmp.WBMPImageReaderSpi.canDecodeInput() throws IOException because the first byte of a PNG header is 137 (unsigned byte), which was read as a negative value (signed byte). Hence it doesn't call " stream.reset() " and when the image is passed to PNGImageReader, the first byte is skipped and the reader falsely throws " javax.imageio.IIOException: Bad PNG signature! " .

REGRESSION. Last worked in version 6u43

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
just call javax.imageio.ImageIO.read() with any PNG file.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Should read a PNG file successfully.
ACTUAL -
It throws " javax.imageio.IIOException: Bad PNG signature! " exception.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
javax.imageio.IIOException: I/O error reading PNG header!
at com.sun.imageio.plugins.png.PNGImageReader.readHeader(PNGImageReader.java:315)
at com.sun.imageio.plugins.png.PNGImageReader.readMetadata(PNGImageReader.java:654)
at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1229)
at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1577)
at javax.imageio.ImageIO.read(ImageIO.java:1448)
at com.syslore.image.reader.BufferedImageBlobImageReader.read(BufferedImageBlobImageReader.java:34)
at com.syslore.image.reader.BlobImageFactory.create(BlobImageFactory.java:61)
at com.syslore.flowmanager.autocrop.SimpleAutoCropper.crop(SimpleAutoCropper.java:56)
at com.syslore.flowmanager.preprocess.AutoCropperBlobImageBuilder.build(AutoCropperBlobImageBuilder.java:55)
at com.syslore.flowmanager.preprocess.AutoCropperBlobImageBuilderTest.testCropSimpleImage(AutoCropperBlobImageBuilderTest.java:38)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.runTestClass(JUnitTestClassExecuter.java:55)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.execute(JUnitTestClassExecuter.java:42)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassProcessor.processTestClass(JUnitTestClassProcessor.java:75)
at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:49)
at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.messaging.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:32)
at org.gradle.messaging.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:99)
at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.messaging.remote.internal.TypeCastDispatch.dispatch(TypeCastDispatch.java:30)
at org.gradle.messaging.remote.internal.WorkerProtocol.handleIncoming(WorkerProtocol.java:53)
at org.gradle.messaging.remote.internal.WorkerProtocol.handleIncoming(WorkerProtocol.java:31)
at org.gradle.messaging.remote.internal.ProtocolStack$ProtocolStage.handleIncoming(ProtocolStack.java:167)
at org.gradle.messaging.remote.internal.ProtocolStack$BottomStage.handleIncoming(ProtocolStack.java:277)
at org.gradle.messaging.remote.internal.ProtocolStack$BottomConnection$1.run(ProtocolStack.java:299)
at org.gradle.messaging.remote.internal.ProtocolStack$ExecuteRunnable.dispatch(ProtocolStack.java:120)
at org.gradle.messaging.remote.internal.ProtocolStack$ExecuteRunnable.dispatch(ProtocolStack.java:116)
at org.gradle.messaging.dispatch.AsyncDispatch.dispatchMessages(AsyncDispatch.java:132)
at org.gradle.messaging.dispatch.AsyncDispatch.access$000(AsyncDispatch.java:33)
at org.gradle.messaging.dispatch.AsyncDispatch$1.run(AsyncDispatch.java:72)
at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
Caused by: javax.imageio.IIOException: Bad PNG signature!
at com.sun.imageio.plugins.png.PNGImageReader.readHeader(PNGImageReader.java:242)
... 60 more

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
ImageInputStream imageInputStream = new FileImageInputStream(new File( " simple_10x10.png " ));

BufferedImage bufferedImage = javax.imageio.ImageIO.read(imageInputStream);
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
No workaround found.