1 files changed, 55 insertions, 0 deletions
diff --git a/tensorflow/core/lib/core/coding.h b/tensorflow/core/lib/core/coding.h
new file mode 100644
index 0000000000..0c14bf1bbf
--- /dev/null
+++ b/tensorflow/core/lib/core/coding.h
@@ -0,0 +1,55 @@
+// Endian-neutral encoding:
+// * Fixed-length numbers are encoded with least-significant byte first
+// * In addition we support variable length "varint" encoding
+// * Strings are encoded prefixed by their length in varint format
+
+#ifndef TENSORFLOW_LIB_CORE_CODING_H_
+#define TENSORFLOW_LIB_CORE_CODING_H_
+
+#include "tensorflow/core/lib/core/raw_coding.h"
+#include "tensorflow/core/lib/core/stringpiece.h"
+#include "tensorflow/core/platform/port.h"
+
+namespace tensorflow {
+namespace core {
+
+// Lower-level versions of Put... that write directly into a character buffer
+// REQUIRES: dst has enough space for the value being written
+extern void EncodeFixed32(char* dst, uint32 value);
+extern void EncodeFixed64(char* dst, uint64 value);
+extern void PutFixed32(string* dst, uint32 value);
+extern void PutFixed64(string* dst, uint64 value);
+
+extern void PutVarint32(string* dst, uint32 value);
+extern void PutVarint64(string* dst, uint64 value);
+
+extern bool GetVarint32(StringPiece* input, uint32* value);
+extern bool GetVarint64(StringPiece* input, uint64* value);
+
+extern const char* GetVarint32Ptr(const char* p, const char* limit, uint32* v);
+extern const char* GetVarint64Ptr(const char* p, const char* limit, uint64* v);
+
+// Internal routine for use by fallback path of GetVarint32Ptr
+extern const char* GetVarint32PtrFallback(const char* p, const char* limit,
+                                          uint32* value);
+inline const char* GetVarint32Ptr(const char* p, const char* limit,
+                                  uint32* value) {
+  if (p < limit) {
+    uint32 result = *(reinterpret_cast<const unsigned char*>(p));
+    if ((result & 128) == 0) {
+      *value = result;
+      return p + 1;
+    }
+  }
+  return GetVarint32PtrFallback(p, limit, value);
+}
+
+extern char* EncodeVarint64(char* dst, uint64 v);
+
+// Returns the length of the varint32 or varint64 encoding of "v"
+extern int VarintLength(uint64_t v);
+
+}  // namespace core
+}  // namespace tensorflow
+
+#endif  // TENSORFLOW_LIB_CORE_CODING_H_