Remove unnecessary ring buffer boundary checks.

PiperOrigin-RevId: 990982480

c/enc/hash.h

diff --git a/c/enc/hash.h b/c/enc/hash.h
index 35addc8..0340611 100644
--- a/c/enc/hash.h
+++ b/c/enc/hash.h
@@ -850,8 +850,6 @@
   }
 #endif
 
-  BROTLI_DCHECK(cur_ix_masked + max_length <= ring_buffer_mask + 1);
-
   for (i = 0; i < 4; ++i) {
     const size_t distance = (size_t)distance_cache[i];
     size_t offset;
@@ -895,7 +893,7 @@
     limit = source_size - offset;
     limit = (limit > max_length) ? max_length : limit;
     if (distance > max_distance) continue;
-    if (cur_ix_masked + best_len > ring_buffer_mask || best_len >= limit ||
+    if (best_len >= limit ||
         /* compare 4 bytes ending at best_len + 1 */
         BrotliUnalignedRead32(&data[cur_ix_masked + best_len - 3]) !=
             BrotliUnalignedRead32(&source[offset + best_len - 3])) {

c/enc/hash_longest_match_simd_opt_inc.h

diff --git a/c/enc/hash_longest_match_simd_opt_inc.h b/c/enc/hash_longest_match_simd_opt_inc.h
index 6985a5d..6c54fae 100644
--- a/c/enc/hash_longest_match_simd_opt_inc.h
+++ b/c/enc/hash_longest_match_simd_opt_inc.h
@@ -190,11 +190,7 @@
     }
     prev_ix &= ring_buffer_mask;
 
-    if (cur_ix_masked + best_len > ring_buffer_mask) {
-      break;
-    }
-    if (prev_ix + best_len > ring_buffer_mask ||
-        BrotliUnalignedRead16(&data[cur_ix_masked + best_len - 1]) !=
+    if (BrotliUnalignedRead16(&data[cur_ix_masked + best_len - 1]) !=
             BrotliUnalignedRead16(&data[prev_ix + best_len - 1])) {
       continue;
     }
@@ -244,11 +240,7 @@
         break;
       }
       prev_ix &= ring_buffer_mask;
-      if (cur_ix_masked + best_len > ring_buffer_mask) {
-        break;
-      }
-      if (prev_ix + best_len > ring_buffer_mask ||
-          /* compare 4 bytes ending at best_len + 1 */
+      if (/* compare 4 bytes ending at best_len + 1 */
           BrotliUnalignedRead32(&data[cur_ix_masked + best_len - 3]) !=
               BrotliUnalignedRead32(&data[prev_ix + best_len - 3])) {
         continue;