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58c52b155a
Problem: - `Streamer` is the same in [PBM,PGM,PPM]Loader class implementations. Solution: - Extract it to its own header file to reduce maintenance burden. - Implement `read` in terms of `read_bytes` to make the class "DRY". - Decorate all functions with `constexpr`.
78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
/*
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* Copyright (c) 2020, Hüseyin ASLITÜRK <asliturk@hotmail.com>, the SerenityOS developers
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Array.h>
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#include <AK/Endian.h>
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#include <AK/Types.h>
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#include <string.h>
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namespace Gfx {
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class Streamer {
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public:
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constexpr Streamer(const u8* data, size_t size)
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: m_data_ptr(data)
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, m_size_remaining(size)
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{
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}
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template<typename T>
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constexpr bool read(T& value)
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{
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AK::Array<u8, sizeof(T)> network_buffer {};
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auto network_value = new (network_buffer.data()) AK::NetworkOrdered<T> {};
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auto res = read_bytes(network_buffer.data(), sizeof(T));
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value = T(*network_value);
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return res;
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}
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constexpr bool read_bytes(u8* buffer, size_t count)
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{
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if (m_size_remaining < count) {
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return false;
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}
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memcpy(buffer, m_data_ptr, count);
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m_data_ptr += count;
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m_size_remaining -= count;
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return true;
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}
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constexpr bool at_end() const { return !m_size_remaining; }
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constexpr void step_back()
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{
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m_data_ptr -= 1;
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m_size_remaining += 1;
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}
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private:
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const u8* m_data_ptr { nullptr };
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size_t m_size_remaining { 0 };
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};
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}
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