On Fri, 5 Apr 2024 17:44:38 GMT, Roger Riggs <rri...@openjdk.org> wrote:
> When encoding a vary large string in String.getBytes(StandardCharset.UTF_8) > computation of the buffer size may exceed the range of a positive 32-bit > Integer. > If the estimated size for the result byte array is too large, pre-compute the > exact buffer size. > If that exceeds the range, then throw OutOfMemoryError. Code fix looks good, but see the comment in the test. test/jdk/java/lang/String/CompactString/MaxSizeUTF16String.java line 143: > 141: // Strings of size min+1...min+2, throw OOME > 142: // The resulting byte array would exceed implementation limits > 143: for (int count = min + 1; count < max; count++) { The case `min + 1` cannot lead to a `NegativeArraySizeException` in the current code, since `3 * (min + 1) <= MAX_VALUE`. In theory, it should succeed by returning the encoded `byte[]`, although It throws `OOME` for exceeding VM limits. That is, this case does not trigger the invocation of `computeSizeUTF8_UTF16()` in the proposed fix. Only `min + 2` throws `NegativeArraySizeException` in the current code, and thus the invocation of `computeSizeUTF8_UTF16()` in the proposed fix. ------------- PR Review: https://git.openjdk.org/jdk/pull/18663#pullrequestreview-1985830221 PR Review Comment: https://git.openjdk.org/jdk/pull/18663#discussion_r1555466467