chromium/third_party/tflite_support/src/tensorflow_lite_support/metadata/cc/metadata_extractor.cc

/* Copyright 2020 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.
==============================================================================*/

#include "tensorflow_lite_support/metadata/cc/metadata_extractor.h"

#include <string>

#include "absl/memory/memory.h"  // from @com_google_absl
#include "absl/status/status.h"  // from @com_google_absl
#include "absl/strings/str_cat.h"  // from @com_google_absl
#include "absl/strings/str_format.h"  // from @com_google_absl
#include "absl/strings/string_view.h"  // from @com_google_absl
#include "flatbuffers/flatbuffers.h"  // from @flatbuffers
#include "tensorflow/lite/schema/schema_generated.h"
#include "tensorflow_lite_support/cc/common.h"
#include "tensorflow_lite_support/cc/port/status_macros.h"
#include "tensorflow_lite_support/metadata/cc/utils/zip_readonly_mem_file.h"
#include "tensorflow_lite_support/metadata/metadata_schema_generated.h"
#include "third_party/zlib/contrib/minizip/ioapi.h"
#include "third_party/zlib/contrib/minizip/unzip.h"


namespace tflite {
namespace metadata {

namespace {
constexpr char kMetadataBufferName[] = …;

StatusCode;
Offset;
Vector;
TensorMetadata;
CreateStatusWithPayload;
TfLiteSupportStatus;

// Util to get item from src_vector specified by index.
template <typename T>
const T* GetItemFromVector(
    const flatbuffers::Vector<flatbuffers::Offset<T>>* src_vector, int index) { … }

// Wrapper function around calls to unzip to avoid repeating conversion logic
// from error code to Status.
absl::Status UnzipErrorToStatus(int error) { … }

// Stores a file name, position in zip buffer and size.
struct ZipFileInfo { … };

// Returns the ZipFileInfo corresponding to the current file in the provided
// unzFile object.
tflite::support::StatusOr<ZipFileInfo> GetCurrentZipFileInfo(
    const unzFile& zf) { … }
}  // namespace

/* static */
tflite::support::StatusOr<std::unique_ptr<ModelMetadataExtractor>>
ModelMetadataExtractor::CreateFromModelBuffer(const char* buffer_data,
                                              size_t buffer_size) { … }

/* static */
tflite::support::StatusOr<const tflite::ProcessUnit*>
ModelMetadataExtractor::FindFirstProcessUnit(
    const tflite::TensorMetadata& tensor_metadata,
    tflite::ProcessUnitOptions type) { … }

/* static */
std::string ModelMetadataExtractor::FindFirstAssociatedFileName(
    const tflite::TensorMetadata& tensor_metadata,
    tflite::AssociatedFileType type, absl::string_view locale) { … }

absl::Status ModelMetadataExtractor::InitFromModelBuffer(
    const char* buffer_data, size_t buffer_size) { … }

absl::Status ModelMetadataExtractor::ExtractAssociatedFiles(
    const char* buffer_data, size_t buffer_size) { … }

tflite::support::StatusOr<absl::string_view>
ModelMetadataExtractor::GetAssociatedFile(const std::string& filename) const { … }

tflite::support::StatusOr<std::string> ModelMetadataExtractor::GetModelVersion()
    const { … }

const flatbuffers::Vector<flatbuffers::Offset<tflite::TensorMetadata>>*
ModelMetadataExtractor::GetInputTensorMetadata() const { … }

const tflite::TensorMetadata* ModelMetadataExtractor::GetInputTensorMetadata(
    int index) const { … }

int ModelMetadataExtractor::GetInputTensorCount() const { … }

const Vector<Offset<TensorMetadata>>*
ModelMetadataExtractor::GetOutputTensorMetadata() const { … }

const tflite::TensorMetadata* ModelMetadataExtractor::GetOutputTensorMetadata(
    int index) const { … }

int ModelMetadataExtractor::GetOutputTensorCount() const { … }

const Vector<flatbuffers::Offset<tflite::ProcessUnit>>*
ModelMetadataExtractor::GetInputProcessUnits() const { … }

const tflite::ProcessUnit* ModelMetadataExtractor::GetInputProcessUnit(
    int index) const { … }

int ModelMetadataExtractor::GetInputProcessUnitsCount() const { … }

const Vector<flatbuffers::Offset<tflite::ProcessUnit>>*
ModelMetadataExtractor::GetOutputProcessUnits() const { … }

const tflite::ProcessUnit* ModelMetadataExtractor::GetOutputProcessUnit(
    int index) const { … }

int ModelMetadataExtractor::GetOutputProcessUnitsCount() const { … }

}  // namespace metadata
}  // namespace tflite