1/* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "io/StringStream.h" 18 19using ::android::StringPiece; 20 21namespace aapt { 22namespace io { 23 24StringInputStream::StringInputStream(const StringPiece& str) : str_(str), offset_(0u) { 25} 26 27bool StringInputStream::Next(const void** data, size_t* size) { 28 if (offset_ == str_.size()) { 29 return false; 30 } 31 32 *data = str_.data() + offset_; 33 *size = str_.size() - offset_; 34 offset_ = str_.size(); 35 return true; 36} 37 38void StringInputStream::BackUp(size_t count) { 39 if (count > offset_) { 40 offset_ = 0u; 41 } else { 42 offset_ -= count; 43 } 44} 45 46size_t StringInputStream::ByteCount() const { 47 return offset_; 48} 49 50size_t StringInputStream::TotalSize() const { 51 return str_.size(); 52} 53 54StringOutputStream::StringOutputStream(std::string* str, size_t buffer_capacity) 55 : str_(str), 56 buffer_capacity_(buffer_capacity), 57 buffer_offset_(0u), 58 buffer_(new char[buffer_capacity]) { 59} 60 61StringOutputStream::~StringOutputStream() { 62 Flush(); 63} 64 65bool StringOutputStream::Next(void** data, size_t* size) { 66 if (buffer_offset_ == buffer_capacity_) { 67 FlushImpl(); 68 } 69 70 *data = buffer_.get() + buffer_offset_; 71 *size = buffer_capacity_ - buffer_offset_; 72 buffer_offset_ = buffer_capacity_; 73 return true; 74} 75 76void StringOutputStream::BackUp(size_t count) { 77 if (count > buffer_offset_) { 78 buffer_offset_ = 0u; 79 } else { 80 buffer_offset_ -= count; 81 } 82} 83 84size_t StringOutputStream::ByteCount() const { 85 return str_->size() + buffer_offset_; 86} 87 88void StringOutputStream::Flush() { 89 if (buffer_offset_ != 0u) { 90 FlushImpl(); 91 } 92} 93 94void StringOutputStream::FlushImpl() { 95 str_->append(buffer_.get(), buffer_offset_); 96 buffer_offset_ = 0u; 97} 98 99} // namespace io 100} // namespace aapt 101