blob: f10e55c37b610b91f4e349a9ae2017734eabb90f [file] [log] [blame]
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "bin/io_buffer.h"
#include "platform/memory_sanitizer.h"
namespace dart {
namespace bin {
Dart_Handle IOBuffer::Allocate(intptr_t size, uint8_t** buffer) {
uint8_t* data = Allocate(size);
if (data == NULL) {
return Dart_Null();
Dart_Handle result = Dart_NewExternalTypedDataWithFinalizer(
Dart_TypedData_kUint8, data, size, data, size, IOBuffer::Finalizer);
if (Dart_IsError(result)) {
if (buffer != NULL) {
*buffer = data;
return result;
uint8_t* IOBuffer::Allocate(intptr_t size) {
return static_cast<uint8_t*>(calloc(size, sizeof(uint8_t)));
uint8_t* IOBuffer::Reallocate(uint8_t* buffer, intptr_t new_size) {
if (new_size == 0) {
// The call to `realloc()` below has a corner case if the new size is 0:
// It can return `nullptr` in that case even though `malloc(0)` would
// return a unique non-`nullptr` value. To avoid returning `nullptr` on
// successful realloc, we handle this case specially.
auto new_buffer = IOBuffer::Allocate(0);
if (new_buffer != nullptr) {
return new_buffer;
return buffer;
// It seems windows realloc() doesn't free memory when shrinking, so we'll
// manually allocate a new buffer, copy the data and free the old buffer.
auto new_buffer = IOBuffer::Allocate(new_size);
if (new_buffer != nullptr) {
memmove(new_buffer, buffer, new_size);
return static_cast<uint8_t*>(new_buffer);
return static_cast<uint8_t*>(realloc(buffer, new_size));
} // namespace bin
} // namespace dart