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 19 using ::android::StringPiece; 20 21 namespace aapt { 22 namespace io { 23 24 StringInputStream::StringInputStream(const StringPiece& str) : str_(str), offset_(0u) { 25 } 26 27 bool 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 38 void StringInputStream::BackUp(size_t count) { 39 if (count > offset_) { 40 offset_ = 0u; 41 } else { 42 offset_ -= count; 43 } 44 } 45 46 size_t StringInputStream::ByteCount() const { 47 return offset_; 48 } 49 50 size_t StringInputStream::TotalSize() const { 51 return str_.size(); 52 } 53 54 StringOutputStream::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 61 StringOutputStream::~StringOutputStream() { 62 Flush(); 63 } 64 65 bool 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 76 void StringOutputStream::BackUp(size_t count) { 77 if (count > buffer_offset_) { 78 buffer_offset_ = 0u; 79 } else { 80 buffer_offset_ -= count; 81 } 82 } 83 84 size_t StringOutputStream::ByteCount() const { 85 return str_->size() + buffer_offset_; 86 } 87 88 void StringOutputStream::Flush() { 89 if (buffer_offset_ != 0u) { 90 FlushImpl(); 91 } 92 } 93 94 void StringOutputStream::FlushImpl() { 95 str_->append(buffer_.get(), buffer_offset_); 96 buffer_offset_ = 0u; 97 } 98 99 } // namespace io 100 } // namespace aapt 101
