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 <stddef.h> 8 #include <stdlib.h> 9 10 #include <algorithm> 11 12 #include "base/logging.h" 13 #include "mojo/public/cpp/bindings/lib/serialization_util.h" 14 15 namespace mojo { 16 namespace internal { 17 FixedBuffer()18FixedBuffer::FixedBuffer() : ptr_(nullptr), cursor_(0), size_(0) {} 19 Initialize(void * memory,size_t size)20void FixedBuffer::Initialize(void* memory, size_t size) { 21 DCHECK(size == internal::Align(size)); 22 23 ptr_ = static_cast<char*>(memory); 24 cursor_ = 0; 25 size_ = size; 26 } 27 Allocate(size_t delta)28void* FixedBuffer::Allocate(size_t delta) { 29 delta = internal::Align(delta); 30 31 if (delta == 0 || delta > size_ - cursor_) { 32 NOTREACHED(); 33 return nullptr; 34 } 35 36 char* result = ptr_ + cursor_; 37 cursor_ += delta; 38 39 return result; 40 } 41 FixedBufferForTesting(size_t size)42FixedBufferForTesting::FixedBufferForTesting(size_t size) { 43 size_ = internal::Align(size); 44 // Use calloc here to ensure all message memory is zero'd out. 45 ptr_ = static_cast<char*>(calloc(size_, 1)); 46 } 47 ~FixedBufferForTesting()48FixedBufferForTesting::~FixedBufferForTesting() { 49 free(ptr_); 50 } 51 Leak()52void* FixedBufferForTesting::Leak() { 53 char* ptr = ptr_; 54 ptr_ = nullptr; 55 cursor_ = 0; 56 size_ = 0; 57 return ptr; 58 } 59 60 } // namespace internal 61 } // namespace mojo 62