garydgregory commented on code in PR #776:
URL: https://github.com/apache/commons-io/pull/776#discussion_r2340346452
##########
src/main/java/org/apache/commons/io/IOUtils.java:
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@@ -2697,6 +2711,68 @@ public static byte[] toByteArray(final InputStream
input, final long size) throw
return toByteArray(input, (int) size);
}
+ /**
+ * Reads exactly {@code size} bytes from the given {@link InputStream}
into a new {@code byte[]}.
+ *
+ * <p>The memory used by this method is <strong>proportional</strong> to
the number
+ * of bytes read and limited by the specified {@code size}. This makes it
suitable for
+ * processing large input streams, provided that
<strong>sufficient</strong> heap space is
+ * available.</p>
+ *
+ * <p>This method processes the input stream in successive chunks of up to
+ * {@code chunkSize} bytes.</p>
+ *
+ * @param input the {@link InputStream} to read; must not be {@code
null}.
+ * @param size the exact number of bytes to read; must be {@code >=
0}.
+ * The actual bytes read are validated to equal {@code
size}.
+ * @param chunkSize The chunk size for incremental reading; must be
{@code > 0}.
+ * @return a new byte array of length {@code size}.
+ * @throws IllegalArgumentException if {@code size} is negative or {@code
chunkSize <= 0}.
+ * @throws EOFException if the stream ends before {@code size}
bytes are read.
+ * @throws IOException if an I/O error occurs while reading.
+ * @throws NullPointerException if {@code input} is {@code null}.
+ * @since 2.21.0
+ */
+ public static byte[] toByteArray(final InputStream input, final int size,
final int chunkSize) throws IOException {
+ Objects.requireNonNull(input, "input");
+ if (chunkSize <= 0) {
+ throw new IllegalArgumentException("Chunk size must be greater
than zero: " + chunkSize);
+ }
+ if (size <= chunkSize) {
+ // throws if size < 0
+ return toByteArray(input::read, size);
+ }
+ final UnsynchronizedByteArrayOutputStream output =
copyToOutputStream(input, size, chunkSize);
+ if (output.size() != size) {
+ throw new EOFException("Unexpected read size, current: " +
output.size() + ", expected: " + size);
Review Comment:
Hi @ppkarwasz
We now have two calls to the new `copyToOutputStream` method, and in both
cases, we check the return value and throw an exception (with different
exceptions and styles in building the message). What about moving the check and
exception throwing inside the private method, which could throw IAE.
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