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// Copyright 2023 The Chromium Authors.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "scoped_print_handle_win.h"
namespace content_analysis {
namespace sdk {
std::unique_ptr<ScopedPrintHandle>
CreateScopedPrintHandle(const ContentAnalysisRequest& request,
int64_t browser_pid) {
if (!request.has_print_data() || !request.print_data().has_handle()) {
return nullptr;
}
// The handle in the request must be duped to be read by the agent
// process. If that doesn't work for any reason, return null.
// See https://learn.microsoft.com/en-us/windows/win32/api/handleapi/nf-handleapi-duplicatehandle
// for details.
HANDLE browser_process = OpenProcess(
/*dwDesiredAccess=*/PROCESS_DUP_HANDLE,
/*bInheritHandle=*/false,
/*dwProcessId=*/browser_pid);
if (!browser_process)
return nullptr;
HANDLE dupe = nullptr;
DuplicateHandle(
/*hSourceProcessHandle=*/browser_process,
/*hSourceHandle=*/reinterpret_cast<HANDLE>(request.print_data().handle()),
/*hTargetProcessHandle=*/GetCurrentProcess(),
/*lpTargetHandle=*/&dupe,
/*dwDesiredAccess=*/PROCESS_DUP_HANDLE | FILE_MAP_READ,
/*bInheritHandle=*/false,
/*dwOptions=*/0);
CloseHandle(browser_process);
if (!dupe)
return nullptr;
ContentAnalysisRequest::PrintData dupe_print_data;
dupe_print_data.set_handle(reinterpret_cast<int64_t>(dupe));
dupe_print_data.set_size(request.print_data().size());
return std::make_unique<ScopedPrintHandleWin>(dupe_print_data);
}
ScopedPrintHandleWin::ScopedPrintHandleWin(
const ContentAnalysisRequest::PrintData& print_data)
: ScopedPrintHandleBase(print_data),
handle_(reinterpret_cast<HANDLE>(print_data.handle())) {
mapped_ = MapViewOfFile(handle_, FILE_MAP_READ, 0, 0, 0);
}
ScopedPrintHandleWin::~ScopedPrintHandleWin() {
CloseHandle(handle_);
}
const char* ScopedPrintHandleWin::data() {
return reinterpret_cast<const char*>(mapped_);
}
} // namespace sdk
} // namespace content_analysis
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