mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-12-25 23:39:37 -05:00
137 lines
3.6 KiB
C++
137 lines
3.6 KiB
C++
/*
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* Copyright (C) 2023 Kyle Reed
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __FILE_READER_HPP__
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#define __FILE_READER_HPP__
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#include "file.hpp"
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#include <cstring>
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#include <cstdlib>
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#include <string>
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#include <string_view>
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#include <vector>
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/* BufferType requires the following members
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* Size size()
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* Result<Size> read(void* data, Size bytes_to_read)
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* Result<Offset> seek(uint32_t offset)
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*/
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/* Iterates lines in buffer split on '\n'.
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* NB: very basic iterator impl, don't try anything fancy with it. */
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template <typename BufferType>
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class BufferLineReader {
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public:
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struct iterator {
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bool operator!=(const iterator& other) {
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return this->pos_ != other.pos_ || this->reader_ != other.reader_;
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}
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const std::string& operator*() {
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if (!cached_) {
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bool ok = reader_->read_line(*this);
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cached_ = true;
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if (!ok) *this = reader_->end();
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}
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return line_data_;
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}
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iterator& operator++() {
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const auto size = reader_->size();
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if (pos_ < size) {
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cached_ = false;
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pos_ += line_data_.length();
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}
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if (pos_ >= size)
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*this = reader_->end();
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return *this;
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}
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typename BufferType::Size pos_{};
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BufferLineReader* reader_{};
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bool cached_ = false;
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std::string line_data_{};
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};
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BufferLineReader(BufferType& buffer)
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: buffer_{buffer} {}
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iterator begin() { return {0, this}; }
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iterator end() { return {size(), this}; }
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typename BufferType::Size size() const { return buffer_.size(); }
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private:
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BufferType& buffer_;
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bool read_line(iterator& it) {
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constexpr size_t buf_size = 0x80;
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char buf[buf_size];
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uint32_t offset = 0;
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it.line_data_.resize(buf_size);
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buffer_.seek(it.pos_);
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while (true) {
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auto read = buffer_.read(buf, buf_size);
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if (!read)
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return false;
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// Find newline.
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auto len = 0u;
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for (; len < *read; ++len) {
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if (buf[len] == '\n') {
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++len;
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break;
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}
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}
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// Reallocate if needed.
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if (offset + len >= it.line_data_.length())
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it.line_data_.resize(offset + len);
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std::strncpy(&it.line_data_[offset], buf, len);
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offset += len;
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if (len < buf_size)
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break;
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}
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it.line_data_.resize(offset);
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return true;
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}
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};
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using FileLineReader = BufferLineReader<File>;
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/* Splits the string on the specified char and returns
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* a vector of string_views. NB: the lifetime of the
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* string to split must be maintained while the views
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* are used or they will dangle. */
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std::vector<std::string_view> split_string(std::string_view str, char c);
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#endif
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