use more bits for q5 buckets if the size is larger than a meg

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "brotli"
-version = "3.1.4"
+version = "3.1.5"
 authors = ["Daniel Reiter Horn <danielrh@dropbox.com>", "The Brotli Authors"]
 description = "A brotli compressor and decompressor that with an interface avoiding the rust stdlib. This makes it suitable for embedded devices and kernels. It is designed with a pluggable allocator so that the standard lib's allocator may be employed. The default build also includes a stdlib allocator and stream interface. Disable this with --features=no-stdlib. All included code is safe."
 license = "BSD-3-Clause/MIT"

src/enc/encode.rs

@@ -916,7 +916,7 @@ fn ChooseHasher(params: &mut BrotliEncoderParams) {
   } else {
     (*hparams).type_ = 5i32;
     (*hparams).block_bits = core::cmp::min((*params).quality - 1, 9);
-    (*hparams).bucket_bits = if (*params).quality < 7 {
+    (*hparams).bucket_bits = if (*params).quality < 7 && (*params).size_hint <= (1usize << 20i32) {
       14i32
     } else {
       15i32