1 files changed, 57 insertions, 0 deletions
diff --git a/tensorflow/core/lib/core/stringpiece.cc b/tensorflow/core/lib/core/stringpiece.cc
new file mode 100644
index 0000000000..57c5139f47
--- /dev/null
+++ b/tensorflow/core/lib/core/stringpiece.cc
@@ -0,0 +1,57 @@
+#include "tensorflow/core/lib/core/stringpiece.h"
+
+#include <iostream>
+#include "tensorflow/core/lib/hash/hash.h"
+
+namespace tensorflow {
+
+size_t StringPiece::Hasher::operator()(StringPiece s) const {
+  return Hash64(s.data(), s.size());
+}
+
+std::ostream& operator<<(std::ostream& o, StringPiece piece) {
+  o.write(piece.data(), piece.size());
+  return o;
+}
+
+bool StringPiece::contains(StringPiece s) const {
+  return memmem(data_, size_, s.data_, s.size_) != nullptr;
+}
+
+size_t StringPiece::find(char c, size_t pos) const {
+  if (pos >= size_) {
+    return npos;
+  }
+  const char* result =
+      reinterpret_cast<const char*>(memchr(data_ + pos, c, size_ - pos));
+  return result != NULL ? result - data_ : npos;
+}
+
+// Search range is [0..pos] inclusive.  If pos == npos, search everything.
+size_t StringPiece::rfind(char c, size_t pos) const {
+  if (size_ == 0) return npos;
+  for (const char* p = data_ + std::min(pos, size_ - 1); p >= data_; p--) {
+    if (*p == c) {
+      return p - data_;
+    }
+  }
+  return npos;
+}
+
+bool StringPiece::Consume(StringPiece x) {
+  if (starts_with(x)) {
+    remove_prefix(x.size_);
+    return true;
+  }
+  return false;
+}
+
+StringPiece StringPiece::substr(size_t pos, size_t n) const {
+  if (pos > size_) pos = size_;
+  if (n > size_ - pos) n = size_ - pos;
+  return StringPiece(data_ + pos, n);
+}
+
+const StringPiece::size_type StringPiece::npos = size_type(-1);
+
+}  // namespace tensorflow