cscore: Separate platform-specific sources (#1387)

cscore/src/main/native/cpp/UsbCameraImplCommon.cpp

@@ -0,0 +1,52 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2016-2018 FIRST. All Rights Reserved.                        */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "cscore_c.h"  // NOLINT(build/include_order)
+
+#include "c_util.h"
+#include "cscore_cpp.h"
+
+using namespace cs;
+
+extern "C" {
+
+CS_Source CS_CreateUsbCameraDev(const char* name, int dev, CS_Status* status) {
+  return cs::CreateUsbCameraDev(name, dev, status);
+}
+
+CS_Source CS_CreateUsbCameraPath(const char* name, const char* path,
+                                 CS_Status* status) {
+  return cs::CreateUsbCameraPath(name, path, status);
+}
+
+char* CS_GetUsbCameraPath(CS_Source source, CS_Status* status) {
+  return ConvertToC(cs::GetUsbCameraPath(source, status));
+}
+
+CS_UsbCameraInfo* CS_EnumerateUsbCameras(int* count, CS_Status* status) {
+  auto cameras = cs::EnumerateUsbCameras(status);
+  CS_UsbCameraInfo* out = static_cast<CS_UsbCameraInfo*>(
+      wpi::CheckedMalloc(cameras.size() * sizeof(CS_UsbCameraInfo)));
+  *count = cameras.size();
+  for (size_t i = 0; i < cameras.size(); ++i) {
+    out[i].dev = cameras[i].dev;
+    out[i].path = ConvertToC(cameras[i].path);
+    out[i].name = ConvertToC(cameras[i].name);
+  }
+  return out;
+}
+
+void CS_FreeEnumeratedUsbCameras(CS_UsbCameraInfo* cameras, int count) {
+  if (!cameras) return;
+  for (int i = 0; i < count; ++i) {
+    std::free(cameras[i].path);
+    std::free(cameras[i].name);
+  }
+  std::free(cameras);
+}
+
+}  // extern "C"