1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "sandbox/win/src/shared_handles.h" 6 7 namespace sandbox { 8 9 // Note once again the the assumption here is that the shared memory is 10 // initialized with zeros in the process that calls SetHandle and that 11 // the process that calls GetHandle 'sees' this memory. 12 13 SharedHandles::SharedHandles() { 14 shared_.items = NULL; 15 shared_.max_items = 0; 16 } 17 18 bool SharedHandles::Init(void* raw_mem, size_t size_bytes) { 19 if (size_bytes < sizeof(shared_.items[0])) { 20 // The shared memory is too small! 21 return false; 22 } 23 shared_.items = static_cast<SharedItem*>(raw_mem); 24 shared_.max_items = size_bytes / sizeof(shared_.items[0]); 25 return true; 26 } 27 28 // Note that an empty slot is marked with a tag == 0 that is why is 29 // not a valid imput tag 30 bool SharedHandles::SetHandle(uint32 tag, HANDLE handle) { 31 if (0 == tag) { 32 // Invalid tag 33 return false; 34 } 35 // Find empty slot and put the tag and the handle there 36 SharedItem* empty_slot = FindByTag(0); 37 if (NULL == empty_slot) { 38 return false; 39 } 40 empty_slot->tag = tag; 41 empty_slot->item = handle; 42 return true; 43 } 44 45 bool SharedHandles::GetHandle(uint32 tag, HANDLE* handle) { 46 if (0 == tag) { 47 // Invalid tag 48 return false; 49 } 50 SharedItem* found = FindByTag(tag); 51 if (NULL == found) { 52 return false; 53 } 54 *handle = found->item; 55 return true; 56 } 57 58 SharedHandles::SharedItem* SharedHandles::FindByTag(uint32 tag) { 59 for (size_t ix = 0; ix != shared_.max_items; ++ix) { 60 if (tag == shared_.items[ix].tag) { 61 return &shared_.items[ix]; 62 } 63 } 64 return NULL; 65 } 66 67 } // namespace sandbox 68
