1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/security/sandbox/win/src/shared_handles.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,67 @@
1.4 +// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#include "sandbox/win/src/shared_handles.h"
1.9 +
1.10 +namespace sandbox {
1.11 +
1.12 +// Note once again the the assumption here is that the shared memory is
1.13 +// initialized with zeros in the process that calls SetHandle and that
1.14 +// the process that calls GetHandle 'sees' this memory.
1.15 +
1.16 +SharedHandles::SharedHandles() {
1.17 + shared_.items = NULL;
1.18 + shared_.max_items = 0;
1.19 +}
1.20 +
1.21 +bool SharedHandles::Init(void* raw_mem, size_t size_bytes) {
1.22 + if (size_bytes < sizeof(shared_.items[0])) {
1.23 + // The shared memory is too small!
1.24 + return false;
1.25 + }
1.26 + shared_.items = static_cast<SharedItem*>(raw_mem);
1.27 + shared_.max_items = size_bytes / sizeof(shared_.items[0]);
1.28 + return true;
1.29 +}
1.30 +
1.31 +// Note that an empty slot is marked with a tag == 0 that is why is
1.32 +// not a valid imput tag
1.33 +bool SharedHandles::SetHandle(uint32 tag, HANDLE handle) {
1.34 + if (0 == tag) {
1.35 + // Invalid tag
1.36 + return false;
1.37 + }
1.38 + // Find empty slot and put the tag and the handle there
1.39 + SharedItem* empty_slot = FindByTag(0);
1.40 + if (NULL == empty_slot) {
1.41 + return false;
1.42 + }
1.43 + empty_slot->tag = tag;
1.44 + empty_slot->item = handle;
1.45 + return true;
1.46 +}
1.47 +
1.48 +bool SharedHandles::GetHandle(uint32 tag, HANDLE* handle) {
1.49 + if (0 == tag) {
1.50 + // Invalid tag
1.51 + return false;
1.52 + }
1.53 + SharedItem* found = FindByTag(tag);
1.54 + if (NULL == found) {
1.55 + return false;
1.56 + }
1.57 + *handle = found->item;
1.58 + return true;
1.59 +}
1.60 +
1.61 +SharedHandles::SharedItem* SharedHandles::FindByTag(uint32 tag) {
1.62 + for (size_t ix = 0; ix != shared_.max_items; ++ix) {
1.63 + if (tag == shared_.items[ix].tag) {
1.64 + return &shared_.items[ix];
1.65 + }
1.66 + }
1.67 + return NULL;
1.68 +}
1.69 +
1.70 +} // namespace sandbox
