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| 1 // Copyright 2014 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 "mojo/public/cpp/bindings/lib/fixed_buffer.h" | |
| 6 | |
| 7 #include <stdlib.h> | |
| 8 | |
| 9 #include <algorithm> | |
| 10 | |
| 11 #include "mojo/public/cpp/bindings/lib/bindings_serialization.h" | |
| 12 #include "mojo/public/cpp/environment/logging.h" | |
| 13 | |
| 14 namespace mojo { | |
| 15 namespace internal { | |
| 16 | |
| 17 FixedBuffer::FixedBuffer(size_t size) | |
| 18 : ptr_(nullptr), cursor_(0), size_(internal::Align(size)) { | |
| 19 // calloc() required to zero memory and thus avoid info leaks. | |
| 20 ptr_ = static_cast<char*>(calloc(size_, 1)); | |
| 21 } | |
| 22 | |
| 23 FixedBuffer::~FixedBuffer() { | |
| 24 free(ptr_); | |
| 25 } | |
| 26 | |
| 27 void* FixedBuffer::Allocate(size_t delta) { | |
| 28 delta = internal::Align(delta); | |
| 29 | |
| 30 if (delta == 0 || delta > size_ - cursor_) { | |
| 31 MOJO_DCHECK(false) << "Not reached"; | |
| 32 return nullptr; | |
| 33 } | |
| 34 | |
| 35 char* result = ptr_ + cursor_; | |
| 36 cursor_ += delta; | |
| 37 | |
| 38 return result; | |
| 39 } | |
| 40 | |
| 41 void* FixedBuffer::Leak() { | |
| 42 char* ptr = ptr_; | |
| 43 ptr_ = nullptr; | |
| 44 cursor_ = 0; | |
| 45 size_ = 0; | |
| 46 return ptr; | |
| 47 } | |
| 48 | |
| 49 } // namespace internal | |
| 50 } // namespace mojo | |
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