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comparison: security/sandbox/win/src/shared_handles.cc
security/sandbox/win/src/shared_handles.cc
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| 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 |
