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// 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/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
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