printing/backend/printing_info_win.cc

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "printing/backend/printing_info_win.h"

#include <stdint.h>

#include "base/containers/heap_array.h"
#include "base/logging.h"

namespace printing {

namespace internal {

base::HeapArray<uint8_t> GetDriverInfo(HANDLE printer, int level) {
  DWORD size = 0;
  // ::GetPrinterDriver() will always fail on this check for the required size
  // because the provided buffer is intentionally insufficient.
  ::GetPrinterDriver(printer, nullptr, level, nullptr, 0, &size);
  if (GetLastError() != ERROR_INSUFFICIENT_BUFFER || size == 0)
    return {};

  auto buffer = base::HeapArray<uint8_t>::Uninit(size);
  if (!::GetPrinterDriver(printer, nullptr, level, buffer.data(), size,
                          &size)) {
    return {};
  }

  return buffer;
}

base::HeapArray<uint8_t> GetPrinterInfo(HANDLE printer, int level) {
  DWORD size = 0;
  // ::GetPrinter() will always fail on this check for the required size
  // because the provided buffer is intentionally insufficient.
  ::GetPrinter(printer, level, nullptr, 0, &size);
  DWORD last_err = GetLastError();
  if (last_err != ERROR_INSUFFICIENT_BUFFER || size == 0) {
    LOG(WARNING) << "Failed to get size of PRINTER_INFO_" << level
                 << ", error = " << last_err;
    return {};
  }

  auto buffer = base::HeapArray<uint8_t>::Uninit(size);
  if (!::GetPrinter(printer, level, buffer.data(), size, &size)) {
    LOG(WARNING) << "Failed to get PRINTER_INFO_" << level
                 << ", error = " << GetLastError();
    return {};
  }
  return buffer;
}

}  // namespace internal

}  // namespace printing