1 // Copyright (c) 2013 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.
5 #include "nacl_io/fifo_char.h"
15 FIFOChar::FIFOChar(size_t size)
16 : buffer_(NULL), size_(size), avail_(0), tail_(0) {
18 buffer_ = (char*)malloc(size);
19 assert(buffer_ != NULL);
23 FIFOChar::~FIFOChar() {
27 bool FIFOChar::IsEmpty() {
31 bool FIFOChar::IsFull() {
32 return avail_ >= size_;
35 bool FIFOChar::Resize(size_t len) {
36 // Can not resize smaller than the current size
41 buffer_ = (char*)realloc(buffer_, len);
42 assert(buffer_ != NULL);
49 size_t FIFOChar::ReadAvailable() {
53 size_t FIFOChar::WriteAvailable() {
54 return size_ - avail_;
57 size_t FIFOChar::Peek(void* buf, size_t len) {
58 char* ptr = static_cast<char*>(buf);
61 len = std::min(len, avail_);
65 size_t read_len = std::min(len, size_ - offs);
66 memcpy(ptr, &buffer_[offs], read_len);
81 size_t FIFOChar::Read(void* buf, size_t len) {
82 size_t read_len = Peek(buf, len);
85 tail_ = (tail_ + read_len) % size_;
90 size_t FIFOChar::Write(const void* buf, size_t len) {
91 const char* ptr = static_cast<const char*>(buf);
93 size_t room = size_ - avail_;
94 len = std::min(len, room);
96 size_t offs = (tail_ + avail_) % size_;
98 size_t write_len = std::min(len, size_ - offs);
99 memcpy(&buffer_[offs], ptr, write_len);
114 } // namespace nacl_io