Add C++ API for streaming zipformer ASR on RK NPU (#1908)

sherpa-onnx/csrc/file-utils.cc

@@ -5,6 +5,7 @@
 #include "sherpa-onnx/csrc/file-utils.h"
 
 #include <fstream>
+#include <memory>
 #include <string>
 
 #include "sherpa-onnx/csrc/macros.h"
@@ -22,4 +23,61 @@ void AssertFileExists(const std::string &filename) {
   }
 }
 
+std::vector<char> ReadFile(const std::string &filename) {
+  std::ifstream input(filename, std::ios::binary);
+  std::vector<char> buffer(std::istreambuf_iterator<char>(input), {});
+  return buffer;
+}
+
+#if __ANDROID_API__ >= 9
+std::vector<char> ReadFile(AAssetManager *mgr, const std::string &filename) {
+  AAsset *asset = AAssetManager_open(mgr, filename.c_str(), AASSET_MODE_BUFFER);
+  if (!asset) {
+    __android_log_print(ANDROID_LOG_FATAL, "sherpa-onnx",
+                        "Read binary file: Load %s failed", filename.c_str());
+    exit(-1);
+  }
+
+  auto p = reinterpret_cast<const char *>(AAsset_getBuffer(asset));
+  size_t asset_length = AAsset_getLength(asset);
+
+  std::vector<char> buffer(p, p + asset_length);
+  AAsset_close(asset);
+
+  return buffer;
+}
+#endif
+
+#if __OHOS__
+std::vector<char> ReadFile(NativeResourceManager *mgr,
+                           const std::string &filename) {
+  std::unique_ptr<RawFile, decltype(&OH_ResourceManager_CloseRawFile)> fp(
+      OH_ResourceManager_OpenRawFile(mgr, filename.c_str()),
+      OH_ResourceManager_CloseRawFile);
+
+  if (!fp) {
+    std::ostringstream os;
+    os << "Read file '" << filename << "' failed.";
+    SHERPA_ONNX_LOGE("%s", os.str().c_str());
+    return {};
+  }
+
+  auto len = static_cast<int32_t>(OH_ResourceManager_GetRawFileSize(fp.get()));
+
+  std::vector<char> buffer(len);
+
+  int32_t n = OH_ResourceManager_ReadRawFile(fp.get(), buffer.data(), len);
+
+  if (n != len) {
+    std::ostringstream os;
+    os << "Read file '" << filename << "' failed. Number of bytes read: " << n
+       << ". Expected bytes to read: " << len;
+    SHERPA_ONNX_LOGE("%s", os.str().c_str());
+    return {};
+  }
+
+  return buffer;
+}
+#endif
+
 }  // namespace sherpa_onnx