| /* Copyright 2015 The TensorFlow Authors. All Rights Reserved. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| ==============================================================================*/ |
| |
| // Helper routines for encoding/decoding tensor contents. |
| #ifndef TENSORFLOW_PLATFORM_TENSOR_CODING_H_ |
| #define TENSORFLOW_PLATFORM_TENSOR_CODING_H_ |
| |
| #include <string> |
| #include "tensorflow/core/lib/core/refcount.h" |
| #include "tensorflow/core/lib/core/stringpiece.h" |
| #include "tensorflow/core/platform/platform.h" |
| #include "tensorflow/core/platform/protobuf.h" |
| #include "tensorflow/core/platform/types.h" |
| |
| namespace tensorflow { |
| namespace port { |
| |
| // Store src contents in *out. If backing memory for src is shared with *out, |
| // will ref obj during the call and will arrange to unref obj when no |
| // longer needed. |
| void AssignRefCounted(StringPiece src, core::RefCounted* obj, string* out); |
| |
| // Copy contents of src to dst[0,src.size()-1]. |
| inline void CopyToArray(const string& src, char* dst) { |
| memcpy(dst, src.data(), src.size()); |
| } |
| |
| // Copy subrange [pos:(pos + n)) from src to dst. If pos >= src.size() the |
| // result is empty. If pos + n > src.size() the subrange [pos, size()) is |
| // copied. |
| inline void CopySubrangeToArray(const string& src, size_t pos, size_t n, |
| char* dst) { |
| if (pos >= src.size()) return; |
| memcpy(dst, src.data() + pos, std::min(n, src.size() - pos)); |
| } |
| |
| // Store encoding of strings[0..n-1] in *out. |
| void EncodeStringList(const tstring* strings, int64 n, string* out); |
| |
| // Decode n strings from src and store in strings[0..n-1]. |
| // Returns true if successful, false on parse error. |
| bool DecodeStringList(const string& src, tstring* strings, int64 n); |
| |
| // Assigns base[0..bytes-1] to *s |
| void CopyFromArray(string* s, const char* base, size_t bytes); |
| |
| // Encodes sequences of strings and serialized protocol buffers into a string. |
| // Normal usage consists of zero or more calls to Append() and a single call to |
| // Finalize(). |
| class StringListEncoder { |
| public: |
| virtual ~StringListEncoder() = default; |
| |
| // Encodes the given protocol buffer. This may not be called after Finalize(). |
| virtual void Append(const protobuf::MessageLite& m) = 0; |
| |
| // Encodes the given string. This may not be called after Finalize(). |
| virtual void Append(const string& s) = 0; |
| |
| // Signals end of the encoding process. No other calls are allowed after this. |
| virtual void Finalize() = 0; |
| }; |
| |
| // Decodes a string into sequences of strings (which may represent serialized |
| // protocol buffers). Normal usage involves a single call to ReadSizes() in |
| // order to retrieve the length of all the strings in the sequence. For each |
| // size returned a call to Data() is expected and will return the actual |
| // string. |
| class StringListDecoder { |
| public: |
| virtual ~StringListDecoder() = default; |
| |
| // Populates the given vector with the lengths of each string in the sequence |
| // being decoded. Upon returning the vector is guaranteed to contain as many |
| // elements as there are strings in the sequence. |
| virtual bool ReadSizes(std::vector<uint32>* sizes) = 0; |
| |
| // Returns a pointer to the next string in the sequence, then prepares for the |
| // next call by advancing 'size' characters in the sequence. |
| virtual const char* Data(uint32 size) = 0; |
| }; |
| |
| std::unique_ptr<StringListEncoder> NewStringListEncoder(string* out); |
| std::unique_ptr<StringListDecoder> NewStringListDecoder(const string& in); |
| |
| #if defined(TENSORFLOW_PROTOBUF_USES_CORD) |
| // Store src contents in *out. If backing memory for src is shared with *out, |
| // will ref obj during the call and will arrange to unref obj when no |
| // longer needed. |
| void AssignRefCounted(StringPiece src, core::RefCounted* obj, Cord* out); |
| |
| // TODO(kmensah): Macro guard this with a check for Cord support. |
| inline void CopyToArray(const Cord& src, char* dst) { src.CopyToArray(dst); } |
| |
| // Copy n bytes of src to dst. If pos >= src.size() the result is empty. |
| // If pos + n > src.size() the subrange [pos, size()) is copied. |
| inline void CopySubrangeToArray(const Cord& src, int64 pos, int64 n, |
| char* dst) { |
| src.Subcord(pos, n).CopyToArray(dst); |
| } |
| |
| // Store encoding of strings[0..n-1] in *out. |
| void EncodeStringList(const tstring* strings, int64 n, Cord* out); |
| |
| // Decode n strings from src and store in strings[0..n-1]. |
| // Returns true if successful, false on parse error. |
| bool DecodeStringList(const Cord& src, tstring* strings, int64 n); |
| |
| // Assigns base[0..bytes-1] to *c |
| void CopyFromArray(Cord* c, const char* base, size_t bytes); |
| |
| std::unique_ptr<StringListEncoder> NewStringListEncoder(Cord* out); |
| std::unique_ptr<StringListDecoder> NewStringListDecoder(const Cord& in); |
| #endif // defined(TENSORFLOW_PROTOBUF_USES_CORD) |
| |
| } // namespace port |
| } // namespace tensorflow |
| |
| #endif // TENSORFLOW_PLATFORM_TENSOR_CODING_H_ |