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Diffstat (limited to 'sandbox/win/src/shared_handles.cc')
-rw-r--r-- | sandbox/win/src/shared_handles.cc | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/sandbox/win/src/shared_handles.cc b/sandbox/win/src/shared_handles.cc new file mode 100644 index 0000000000..423b67bab3 --- /dev/null +++ b/sandbox/win/src/shared_handles.cc @@ -0,0 +1,67 @@ +// Copyright (c) 2006-2008 The Chromium 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 "sandbox/win/src/shared_handles.h" + +namespace sandbox { + +// Note once again the the assumption here is that the shared memory is +// initialized with zeros in the process that calls SetHandle and that +// the process that calls GetHandle 'sees' this memory. + +SharedHandles::SharedHandles() { + shared_.items = NULL; + shared_.max_items = 0; +} + +bool SharedHandles::Init(void* raw_mem, size_t size_bytes) { + if (size_bytes < sizeof(shared_.items[0])) { + // The shared memory is too small! + return false; + } + shared_.items = static_cast<SharedItem*>(raw_mem); + shared_.max_items = size_bytes / sizeof(shared_.items[0]); + return true; +} + +// Note that an empty slot is marked with a tag == 0 that is why is +// not a valid imput tag +bool SharedHandles::SetHandle(uint32 tag, HANDLE handle) { + if (0 == tag) { + // Invalid tag + return false; + } + // Find empty slot and put the tag and the handle there + SharedItem* empty_slot = FindByTag(0); + if (NULL == empty_slot) { + return false; + } + empty_slot->tag = tag; + empty_slot->item = handle; + return true; +} + +bool SharedHandles::GetHandle(uint32 tag, HANDLE* handle) { + if (0 == tag) { + // Invalid tag + return false; + } + SharedItem* found = FindByTag(tag); + if (NULL == found) { + return false; + } + *handle = found->item; + return true; +} + +SharedHandles::SharedItem* SharedHandles::FindByTag(uint32 tag) { + for (size_t ix = 0; ix != shared_.max_items; ++ix) { + if (tag == shared_.items[ix].tag) { + return &shared_.items[ix]; + } + } + return NULL; +} + +} // namespace sandbox |