feat: bump snappy to 1.2.1

see google/snappy#183

deps/snappy/CMakeLists.txt

@@ -27,7 +27,7 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 cmake_minimum_required(VERSION 3.1)
-project(Snappy VERSION 1.1.10 LANGUAGES C CXX)
+project(Snappy VERSION 1.2.1 LANGUAGES C CXX)
 
 # C++ standard can be overridden when this is used as a sub-project.
 if(NOT CMAKE_CXX_STANDARD)

deps/snappy/snappy-internal.h

@@ -334,6 +334,31 @@ static inline std::pair<size_t, bool> FindMatchLength(const char* s1,
 }
 #endif
 
+static inline size_t FindMatchLengthPlain(const char* s1, const char* s2,
+                                          const char* s2_limit) {
+  // Implementation based on the x86-64 version, above.
+  assert(s2_limit >= s2);
+  int matched = 0;
+
+  while (s2 <= s2_limit - 8 &&
+         UNALIGNED_LOAD64(s2) == UNALIGNED_LOAD64(s1 + matched)) {
+    s2 += 8;
+    matched += 8;
+  }
+  if (LittleEndian::IsLittleEndian() && s2 <= s2_limit - 8) {
+    uint64_t x = UNALIGNED_LOAD64(s2) ^ UNALIGNED_LOAD64(s1 + matched);
+    int matching_bits = Bits::FindLSBSetNonZero64(x);
+    matched += matching_bits >> 3;
+    s2 += matching_bits >> 3;
+  } else {
+    while ((s2 < s2_limit) && (s1[matched] == *s2)) {
+      ++s2;
+      ++matched;
+    }
+  }
+  return matched;
+}
+
 // Lookup tables for decompression code.  Give --snappy_dump_decompression_table
 // to the unit test to recompute char_table.