[commons-compress] 02/05: In most IOUtil methods, the target may be null to simulate output to dev/null on Linux and NUL on Windows.

[ggregory]

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ggregory pushed a commit to branch master
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commit f2b68e96847fc6a3af50cab63f4619331633c3d9
Author: Gary Gregory <garydgreg...@gmail.com>
AuthorDate: Sun Feb 13 16:48:37 2022 -0500

    In most IOUtil methods,the target may be null to simulate output to
    dev/null on Linux and NUL on Windows.
    
    Used a next commit.
---
 .../java/org/apache/commons/compress/utils/IOUtils.java    | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/main/java/org/apache/commons/compress/utils/IOUtils.java 
b/src/main/java/org/apache/commons/compress/utils/IOUtils.java
index a043b8e..528b858 100644
--- a/src/main/java/org/apache/commons/compress/utils/IOUtils.java
+++ b/src/main/java/org/apache/commons/compress/utils/IOUtils.java
@@ -61,7 +61,7 @@ public final class IOUtils {
      * @param input
      *            the InputStream to copy
      * @param output
-     *            the target Stream
+     *            the target, may be null to simulate output to dev/null on 
Linux and NUL on Windows
      * @return the number of bytes copied
      * @throws IOException
      *             if an error occurs
@@ -76,7 +76,7 @@ public final class IOUtils {
      * @param input
      *            the InputStream to copy
      * @param output
-     *            the target Stream
+     *            the target, may be null to simulate output to dev/null on 
Linux and NUL on Windows
      * @param buffersize
      *            the buffer size to use, must be bigger than 0
      * @return the number of bytes copied
@@ -93,7 +93,9 @@ public final class IOUtils {
         int n = 0;
         long count=0;
         while (-1 != (n = input.read(buffer))) {
-            output.write(buffer, 0, n);
+            if (output != null) {
+                output.write(buffer, 0, n);
+            }
             count += n;
         }
         return count;
@@ -309,7 +311,7 @@ public final class IOUtils {
      * @param len
      *            maximum amount of bytes to copy
      * @param output
-     *            the target Stream
+     *            the target, may be null to simulate output to dev/null on 
Linux and NUL on Windows
      * @param buffersize
      *            the buffer size to use, must be bigger than 0
      * @return the number of bytes copied
@@ -328,7 +330,9 @@ public final class IOUtils {
         int n = 0;
         long count = 0;
         while (count < len && -1 != (n = input.read(buffer, 0, (int) 
Math.min(len - count, buffer.length)))) {
-            output.write(buffer, 0, n);
+            if (output != null) {
+                output.write(buffer, 0, n);
+            }
             count += n;
         }
         return count;