record size of encrypted temp data

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1894303 13f79535-47bb-0310-9956-ffa450edef68

poi-ooxml/src/main/java/org/apache/poi/openxml4j/opc/internal/EncryptedTempFilePackagePart.java

@@ -98,12 +98,9 @@ public final class EncryptedTempFilePackagePart extends PackagePart {
         return tempFile.getOutputStream();
     }
 
-    /**
-     * @return EncryptedTempData.getSize() always returns -1
-     */
     @Override
     public long getSize() {
-        return -1;
+        return tempFile.getByteCount();
     }
 
     @Override

poi-ooxml/src/main/java/org/apache/poi/poifs/crypt/temp/EncryptedTempData.java

@@ -32,6 +32,7 @@ import javax.crypto.CipherInputStream;
 import javax.crypto.CipherOutputStream;
 import javax.crypto.spec.SecretKeySpec;
 
+import org.apache.commons.io.output.CountingOutputStream;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.apache.poi.poifs.crypt.ChainingMode;
@@ -52,7 +53,8 @@ public class EncryptedTempData {
     private final SecretKeySpec skeySpec;
     private final byte[] ivBytes;
     private final File tempFile;
-    
+    private CountingOutputStream outputStream;
+
     public EncryptedTempData() throws IOException {
         SecureRandom sr = new SecureRandom();
         ivBytes = new byte[16];
@@ -72,7 +74,8 @@ public class EncryptedTempData {
      */
     public OutputStream getOutputStream() throws IOException {
         Cipher ciEnc = CryptoFunctions.getCipher(skeySpec, cipherAlgorithm, ChainingMode.cbc, ivBytes, Cipher.ENCRYPT_MODE, PADDING);
-        return new CipherOutputStream(new FileOutputStream(tempFile), ciEnc);
+        outputStream = new CountingOutputStream(new CipherOutputStream(new FileOutputStream(tempFile), ciEnc));
+        return outputStream;
     }
 
     /**
@@ -86,6 +89,13 @@ public class EncryptedTempData {
         return new CipherInputStream(new FileInputStream(tempFile), ciDec);
     }
 
+    /**
+     * @return number of bytes stored in the temp data file (the number you should expect after you decrypt the data)
+     */
+    public long getByteCount() {
+        return outputStream == null ? 0 : outputStream.getByteCount();
+    }
+
     /**
      * Removes the temporarily backing file
      */

poi-ooxml/src/test/java/org/apache/poi/openxml4j/opc/TestEncryptedTempFilePackagePart.java

@@ -33,15 +33,16 @@ public class TestEncryptedTempFilePackagePart {
     @Test
     void testRoundTrip() throws Exception {
         String text = UUID.randomUUID().toString();
+        byte[] bytes = text.getBytes(StandardCharsets.UTF_8);
         String filepath =  OpenXML4JTestDataSamples.getSampleFileName("sample.docx");
 
         try (OPCPackage p = OPCPackage.open(filepath, PackageAccess.READ)) {
             PackagePartName name = new PackagePartName("/test.txt", true);
             EncryptedTempFilePackagePart part = new EncryptedTempFilePackagePart(p, name, "text/plain");
             try (OutputStream os = part.getOutputStream()) {
-                os.write(text.getBytes(StandardCharsets.UTF_8));
+                os.write(bytes);
             }
-            assertEquals(-1, part.getSize());
+            assertEquals(bytes.length, part.getSize());
             try (InputStream is = part.getInputStream()) {
                 assertEquals(text, new String(IOUtils.toByteArray(is), StandardCharsets.UTF_8));
             }

poi-ooxml/src/test/java/org/apache/poi/openxml4j/opc/TestTempFilePackagePart.java

@@ -40,7 +40,7 @@ public class TestTempFilePackagePart {
             PackagePartName name = new PackagePartName("/test.txt", true);
             TempFilePackagePart part = new TempFilePackagePart(p, name, "text/plain");
             try (OutputStream os = part.getOutputStream()) {
-                os.write(text.getBytes(StandardCharsets.UTF_8));
+                os.write(bytes);
             }
             assertEquals(bytes.length, part.getSize());
             try (InputStream is = part.getInputStream()) {