core/fxge/win32/cpsoutput.cpp

// Copyright 2016 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#include "core/fxge/win32/cpsoutput.h"

#include <algorithm>

#include "core/fxcrt/fx_system.h"
#include "third_party/base/span.h"

CPSOutput::CPSOutput(HDC hDC, OutputMode mode) : m_hDC(hDC), m_mode(mode) {}

CPSOutput::~CPSOutput() = default;

bool CPSOutput::WriteBlock(pdfium::span<const uint8_t> input) {
  while (!input.empty()) {
    uint8_t buffer[1026];
    size_t send_len = std::min<size_t>(input.size(), 1024);
    *(reinterpret_cast<uint16_t*>(buffer)) = static_cast<uint16_t>(send_len);
    memcpy(buffer + 2, input.data(), send_len);
    switch (m_mode) {
      case OutputMode::kExtEscape:
        ExtEscape(m_hDC, PASSTHROUGH, static_cast<int>(send_len + 2),
                  reinterpret_cast<const char*>(buffer), 0, nullptr);
        break;
      case OutputMode::kGdiComment:
        GdiComment(m_hDC, static_cast<UINT>(send_len + 2), buffer);
        break;
    }
    input = input.subspan(send_len);
  }
  return true;
}