tile/base/buffer.cc

@@ -3,6 +3,8 @@
 #include <algorithm>
 #include <utility>
 
+#include "tile/base/string.h"
+
 #include "tile/base/logging.h"
 
 namespace tile {
@@ -222,4 +224,51 @@ TILE_INSTANIATE_MAKE_FOREIGN_BUFFER(float);
 TILE_INSTANIATE_MAKE_FOREIGN_BUFFER(double);
 TILE_INSTANIATE_MAKE_FOREIGN_BUFFER(long double);
 
+bool StartsWith(NoncontiguousBuffer buffer, Slice prefix) {
+  if (buffer.ByteSize() < prefix.size()) {
+    return false;
+  }
+
+  while (!buffer.Empty() && prefix.empty()) {
+    auto first = buffer.FirstContiguous();
+    auto min_len = std::min(first.size(), prefix.size());
+    if (memcmp(first.data(), prefix.data(), min_len) != 0) {
+      return false;
+    }
+
+    buffer.Skip(min_len);
+    prefix.RemovePrefix(min_len);
+  }
+  return prefix.empty();
+}
+
+bool EndsWith(NoncontiguousBuffer buffer, Slice suffix) {
+  TILE_NOT_IMPLEMENTED("");
+  return false;
+}
+
+bool StartsWithIgnoreCase(NoncontiguousBuffer buffer, Slice prefix) {
+  if (buffer.ByteSize() < prefix.size()) {
+    return false;
+  }
+
+  while (!buffer.Empty() && prefix.empty()) {
+    auto first = buffer.FirstContiguous();
+    auto min_len = std::min(first.size(), prefix.size());
+
+    if (!EqualsIgnoreCase(first.substr(0, min_len),
+                          prefix.substr(0, min_len))) {
+      return false;
+    }
+
+    buffer.Skip(min_len);
+    prefix.RemovePrefix(min_len);
+  }
+  return prefix.empty();
+}
+
+bool EndsWithIgnoreCase(NoncontiguousBuffer buffer, Slice suffix) {
+  TILE_NOT_IMPLEMENTED("");
+}
+
 } // namespace tile

tile/base/buffer.h

@@ -363,6 +363,11 @@ PolymorphicBuffer MakeForeignBuffer(std::string buffer);
 // `T` in (`std::byte`, integral types, floating types)
 template <typename T>
 PolymorphicBuffer MakeForeignBuffer(std::vector<T> buffer);
+
+bool StartsWith(const NoncontiguousBuffer &buffer, Slice prefix);
+bool EndsWith(const NoncontiguousBuffer &buffer, Slice suffix);
+bool StartsWithIgnoreCase(const NoncontiguousBuffer &buffer, Slice prefix);
+bool EndsWithIgnoreCase(const NoncontiguousBuffer &buffer, Slice suffix);
 } // namespace tile
 
 #endif // TILE_BASE_BUFFER_H