More bluetooth medium code.

internal/platform/implementation/linux/bluetooth_classic_socket.cc

@@ -0,0 +1,68 @@
+#include <array>
+#include <cerrno>
+#include <cstdint>
+#include <unistd.h>
+
+#include "internal/platform/byte_array.h"
+#include "internal/platform/exception.h"
+#include "internal/platform/implementation/linux/bluetooth_classic_socket.h"
+
+namespace nearby {
+namespace linux {
+
+ExceptionOr<ByteArray> BluetoothInputStream::Read(std::int64_t size) {
+  char *data = new char[size];
+  ssize_t ret = read(fd_, data, size);
+  if (ret == 0) {
+    delete[] data;
+    return ExceptionOr(ByteArray());
+  } else if (ret < 0) {
+    delete[] data;
+    return Exception::kIo;
+  }
+
+  return ExceptionOr(ByteArray(data, size));
+}
+
+ExceptionOr<std::size_t> BluetoothInputStream::Skip(std::size_t offset) {
+  auto off = lseek(fd_, offset, SEEK_CUR);
+  if (off != offset) {
+    auto end = lseek(fd_, 0, SEEK_END);
+    return off == end ? ExceptionOr((std::size_t)off) : Exception::kIo;
+  }
+  return ExceptionOr((std::size_t)(off));
+}
+
+ExceptionOr<ByteArray> BluetoothInputStream::ReadExactly(std::size_t size) {
+  char *data = new char[size];
+  ssize_t ret = read(fd_, data, size);
+  if (ret < 0) {
+    delete[] data;
+    return Exception::kIo;
+  }
+
+  return ExceptionOr(ByteArray(data, size));
+}
+
+Exception BluetoothOutputStream::Write(const ByteArray &data) {
+  ssize_t written = 0;
+  while (written < data.size()) {
+    ssize_t ret = write(fd_, data.data(), data.size());
+    if (ret < 1) {
+      return Exception{Exception::kIo};
+    }
+    written += ret;
+  }
+  return Exception{Exception::kSuccess};
+}
+
+Exception BluetoothOutputStream::Flush() {
+  return Exception{Exception::kSuccess};
+}
+
+Exception BluetoothOutputStream::Close() {
+  return close(fd_) < 0 ? Exception{Exception::kIo}
+                        : Exception{Exception::kSuccess};
+}
+} // namespace linux
+} // namespace nearby