src/ui/a11y/bin/a11y_manager/tests/util/util.cc

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "src/ui/a11y/bin/a11y_manager/tests/util/util.h"

namespace accessibility_test {

char *ReadFile(vfs::internal::Node *node, int length, char *buffer) {
  EXPECT_LE(length, kMaxLogBufferSize);
  async::Loop loop(&kAsyncLoopConfigNoAttachToThread);
  loop.StartThread("ReadingDebugFile");

  int fd = OpenAsFD(node, loop.dispatcher());
  EXPECT_LE(0, fd);

  memset(buffer, 0, kMaxLogBufferSize);
  EXPECT_EQ(length, pread(fd, buffer, length, 0));
  return buffer;
}

int OpenAsFD(vfs::internal::Node *node, async_dispatcher_t *dispatcher) {
  zx::channel local, remote;
  EXPECT_EQ(ZX_OK, zx::channel::create(0, &local, &remote));
  EXPECT_EQ(ZX_OK, node->Serve(fuchsia::io::OPEN_RIGHT_READABLE, std::move(remote), dispatcher));
  int fd = -1;
  EXPECT_EQ(ZX_OK, fdio_fd_create(local.release(), &fd));
  return fd;
}

}  // namespace accessibility_test