physfs-deserialize-context.cpp

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/*
 * Copyright (C) 2023  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#include <engine/resources/physfs/physfs-deserialize-context.hpp>
#include <engine/resources/deserialize-error.hpp>
 
physfs_deserialize_context::physfs_deserialize_context(const std::filesystem::path& path)
{
    // Open file for reading using PhysicsFS
    m_file = PHYSFS_openRead(path.string().c_str());
    if (!m_file)
    {
        throw deserialize_error(PHYSFS_getLastError());
    }
    
    // Store file path
    m_path = path;
    
    // Set EOF and error flags if file not open.
    m_eof = !m_file;
    m_error = !m_file;
}
 
physfs_deserialize_context::~physfs_deserialize_context()
{
    if (m_file)
    {
        PHYSFS_close(m_file);
    }
}
 
void physfs_deserialize_context::open(const std::filesystem::path& path)
{
    // Close file, if open
    if (m_file)
    {
        PHYSFS_close(m_file);
    }
    
    // Open file for reading using PhysicsFS
    m_file = PHYSFS_openRead(path.string().c_str());
    if (!m_file)
    {
        throw deserialize_error(PHYSFS_getLastError());
    }
    
    // Store file path
    m_path = path;
    
    // Set EOF and error flags if file not open.
    m_eof = !m_file;
    m_error = !m_file;
}
 
void physfs_deserialize_context::close() noexcept
{
    if (m_file)
    {
        m_error = !PHYSFS_close(m_file);
        m_file = nullptr;
        m_path.clear();
        m_eof = true;
    }
}
 
bool physfs_deserialize_context::is_open() const noexcept
{
    return m_file;
}
 
const std::filesystem::path& physfs_deserialize_context::path() const noexcept
{
    return m_path;
}
 
bool physfs_deserialize_context::error() const noexcept
{
    return m_error;
}
 
bool physfs_deserialize_context::eof() const noexcept
{
    return m_eof;
}
 
std::size_t physfs_deserialize_context::size() const noexcept
{
    const PHYSFS_sint64 length = PHYSFS_fileLength(m_file);
    if (length >= 0)
    {
        return static_cast<std::size_t>(length);
    }
    
    return 0;
};
 
std::size_t physfs_deserialize_context::tell() const
{
    const PHYSFS_sint64 offset = PHYSFS_tell(m_file);
    if (offset < 0)
    {
        // m_error = true;
        throw deserialize_error(PHYSFS_getLastError());
    }
    
    return static_cast<std::size_t>(offset);
}
 
void physfs_deserialize_context::seek(std::size_t offset)
{
    if (!PHYSFS_seek(m_file, static_cast<PHYSFS_uint64>(offset)))
    {
        m_error = true;
        throw deserialize_error(PHYSFS_getLastError());
    }
    
    m_eof = (PHYSFS_eof(m_file) != 0);
}
 
std::size_t physfs_deserialize_context::read8(std::byte* data, std::size_t count)
{
    const PHYSFS_sint64 status = PHYSFS_readBytes(m_file, data, count);
    
    if (status != count)
    {
        if (status < 0 || !PHYSFS_eof(m_file))
        {
            m_error = true;
            throw deserialize_error(PHYSFS_getLastError());
        }
        
        m_eof = true;
        
        return static_cast<std::size_t>(status);
    }
    else
    {
        return count;
    }
}
 
std::size_t physfs_deserialize_context::read16_le(std::byte* data, std::size_t count)
{
    PHYSFS_uint16* data16 = reinterpret_cast<PHYSFS_uint16*>(data);
    
    for (std::size_t i = 0; i < count; ++i)
    {
        if (!PHYSFS_readULE16(m_file, data16))
        {
            m_error = true;
            m_eof = (PHYSFS_eof(m_file) != 0);
            throw deserialize_error(PHYSFS_getLastError());
        }
        
        ++data16;
    }
    
    return count;
}
 
std::size_t physfs_deserialize_context::read16_be(std::byte* data, std::size_t count)
{
    PHYSFS_uint16* data16 = reinterpret_cast<PHYSFS_uint16*>(data);
    
    for (std::size_t i = 0; i < count; ++i)
    {
        if (!PHYSFS_readUBE16(m_file, data16))
        {
            m_error = true;
            m_eof = (PHYSFS_eof(m_file) != 0);
            throw deserialize_error(PHYSFS_getLastError());
        }
        
        ++data16;
    }
    
    return count;
}
 
std::size_t physfs_deserialize_context::read32_le(std::byte* data, std::size_t count)
{
    PHYSFS_uint32* data32 = reinterpret_cast<PHYSFS_uint32*>(data);
    
    for (std::size_t i = 0; i < count; ++i)
    {
        if (!PHYSFS_readULE32(m_file, data32))
        {
            m_error = true;
            m_eof = (PHYSFS_eof(m_file) != 0);
            throw deserialize_error(PHYSFS_getLastError());
        }
        
        ++data32;
    }
    
    return count;
}
 
std::size_t physfs_deserialize_context::read32_be(std::byte* data, std::size_t count)
{
    PHYSFS_uint32* data32 = reinterpret_cast<PHYSFS_uint32*>(data);
    
    for (std::size_t i = 0; i < count; ++i)
    {
        if (!PHYSFS_readUBE32(m_file, data32))
        {
            m_error = true;
            m_eof = (PHYSFS_eof(m_file) != 0);
            throw deserialize_error(PHYSFS_getLastError());
        }
        
        ++data32;
    }
    
    return count;
}
 
std::size_t physfs_deserialize_context::read64_le(std::byte* data, std::size_t count)
{
    PHYSFS_uint64* data64 = reinterpret_cast<PHYSFS_uint64*>(data);
    
    for (std::size_t i = 0; i < count; ++i)
    {
        if (!PHYSFS_readULE64(m_file, data64))
        {
            m_error = true;
            m_eof = (PHYSFS_eof(m_file) != 0);
            throw deserialize_error(PHYSFS_getLastError());
        }
        
        ++data64;
    }
    
    return count;
}
 
std::size_t physfs_deserialize_context::read64_be(std::byte* data, std::size_t count)
{
    PHYSFS_uint64* data64 = reinterpret_cast<PHYSFS_uint64*>(data);
    
    for (std::size_t i = 0; i < count; ++i)
    {
        if (!PHYSFS_readUBE64(m_file, data64))
        {
            m_error = true;
            m_eof = (PHYSFS_eof(m_file) != 0);
            throw deserialize_error(PHYSFS_getLastError());
        }
        
        ++data64;
    }
    
    return count;
}