mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 22:22:45 +00:00
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++
/*
|
|
* Copyright (c) 2020, Hüseyin ASLITÜRK <asliturk@hotmail.com>, the SerenityOS developers
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Array.h>
|
|
#include <AK/Endian.h>
|
|
#include <AK/Types.h>
|
|
#include <string.h>
|
|
|
|
namespace Gfx {
|
|
|
|
class Streamer {
|
|
public:
|
|
constexpr Streamer(const u8* data, size_t size)
|
|
: m_data_ptr(data)
|
|
, m_size_remaining(size)
|
|
{
|
|
}
|
|
|
|
template<typename T>
|
|
constexpr bool read(T& value)
|
|
{
|
|
AK::Array<u8, sizeof(T)> network_buffer {};
|
|
auto network_value = new (network_buffer.data()) AK::NetworkOrdered<T> {};
|
|
auto res = read_bytes(network_buffer.data(), sizeof(T));
|
|
value = T(*network_value);
|
|
return res;
|
|
}
|
|
|
|
constexpr bool read_bytes(u8* buffer, size_t count)
|
|
{
|
|
if (m_size_remaining < count) {
|
|
return false;
|
|
}
|
|
memcpy(buffer, m_data_ptr, count);
|
|
m_data_ptr += count;
|
|
m_size_remaining -= count;
|
|
return true;
|
|
}
|
|
|
|
constexpr bool at_end() const { return !m_size_remaining; }
|
|
|
|
constexpr void step_back()
|
|
{
|
|
m_data_ptr -= 1;
|
|
m_size_remaining += 1;
|
|
}
|
|
|
|
private:
|
|
const u8* m_data_ptr { nullptr };
|
|
size_t m_size_remaining { 0 };
|
|
};
|
|
|
|
}
|