skorotkov commented on code in PR #11518:
URL: https://github.com/apache/ignite/pull/11518#discussion_r1810776896


##########
modules/core/src/main/java/org/apache/ignite/internal/binary/BinaryWriterExImpl.java:
##########
@@ -1880,6 +1892,72 @@ public void writeFieldIdNoSchemaUpdate(int fieldId) {
         fieldCnt++;
     }
 
+    /**
+     * Write byte array from the InputStream with the specified length.
+     *
+     * @param in InputStream.
+     * @param len Length of data in the stream.
+     * @return Number of bytes written.
+     */
+    public int writeByteArrayFromInputStream(InputStream in, int len) throws 
IOException {
+        out.unsafeEnsure(1 + 4 + len);
+
+        return doWriteByteArrayFromInputStream(in, len);
+    }
+
+    /**
+     * Write byte array from the InputStream with uknown length.
+     *
+     * @param in InputStream.
+     * @return Number of bytes written or -1 if stream contains more than 
{@code MAX_ARRAY_SIZE} bytes.
+     */
+    public int writeByteArrayFromInputStream(InputStream in) throws 
IOException {
+        out.unsafeEnsure(1 + 4);
+
+        int writtenLen = doWriteByteArrayFromInputStream(in, MAX_ARRAY_SIZE);
+
+        if (writtenLen == MAX_ARRAY_SIZE && in.read() != -1)

Review Comment:
   This is a case when user didn't provide the length of data in the stream via 
the API.
   
   So we accept any actual length <= `MAX_ARRAY_SIZE` and thus need to check 
that there is no more data in stream if `MAX_ARRAY_SIZE` was achieved.
   
   In any case whether here or in `doWriteByteArrayFromInputStream` we still 
need to do extra `in.read()` to be sure that no more data present in stream.
   
   Moreove in the `doWriteByteArrayFromInputStream` it's supposed that we are 
not allowed to read more bytes (and move stream pointer) to hadle case what 
used does pass the length of data.
   
   Or may be I just do not see the obvious solution ?
   
   



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