iso9660-parser.hh

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/*
 
MIT License
 
Copyright (c) 2022 PCSX-Redux authors
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 
*/
 
#pragma once
 
#include <EASTL/fixed_string.h>
#include <EASTL/functional.h>
#include <EASTL/string_view.h>
 
#include <coroutine>
 
#include "psyqo/cdrom.hh"
#include "psyqo/task.hh"
 
namespace psyqo {
 
class ISO9660Parser {
  public:
    struct DirEntry {
        uint32_t LBA = 0;
        uint32_t size = 0;
        eastl::fixed_string<char, 15, false> name;
        enum { INVALID, FILE, DIRECTORY, CURRENT_DIR, PARENT_DIR } type = INVALID;
    };
 
    struct ReadRequest {
        struct DirEntry entry;
        void* buffer = nullptr;
    };
 
    ISO9660Parser(CDRom* cdrom) : m_cdrom(cdrom) {}
 
    void initialize(eastl::function<void(bool success)> callback);
    TaskQueue::Task scheduleInitialize();
    struct InitializeAwaiter {
        InitializeAwaiter(ISO9660Parser& parser) : m_parser(parser) {}
        bool await_ready() const { return false; }
        template <typename U>
        void await_suspend(std::coroutine_handle<U> handle) {
            m_parser.initialize([handle, this](bool success) {
                m_success = success;
                handle.resume();
            });
        }
        bool await_resume() { return m_success; }
 
      private:
        ISO9660Parser& m_parser;
        bool m_success;
    };
    InitializeAwaiter initialize() { return InitializeAwaiter(*this); }
 
    void getDirentry(eastl::string_view path, DirEntry* entry, eastl::function<void(bool success)> callback);
    TaskQueue::Task scheduleGetDirentry(eastl::string_view path, DirEntry* entry);
    struct GetDirentryAwaiter {
        GetDirentryAwaiter(ISO9660Parser& parser, eastl::string_view path, DirEntry* entry)
            : m_parser(parser), m_path(path), m_entry(entry) {}
        bool await_ready() const { return false; }
        template <typename U>
        void await_suspend(std::coroutine_handle<U> handle) {
            m_parser.getDirentry(m_path, m_entry, [handle, this](bool success) {
                m_success = success;
                handle.resume();
            });
        }
        bool await_resume() { return m_success; }
 
      private:
        ISO9660Parser& m_parser;
        eastl::string_view m_path;
        DirEntry* m_entry;
        bool m_success;
    };
    GetDirentryAwaiter getDirentry(eastl::string_view path, DirEntry* entry) {
        return GetDirentryAwaiter(*this, path, entry);
    }
 
    void walkDirectory(const DirEntry& dir,
                       eastl::function<bool(eastl::string_view name, const DirEntry& entry)> visitor,
                       eastl::function<void(bool success)> callback);
    TaskQueue::Task scheduleWalkDirectory(
        const DirEntry& dir, eastl::function<bool(eastl::string_view name, const DirEntry& entry)> visitor);
    struct WalkDirectoryAwaiter {
        WalkDirectoryAwaiter(ISO9660Parser& parser, const DirEntry& dir,
                             eastl::function<bool(eastl::string_view name, const DirEntry& entry)> visitor)
            : m_parser(parser), m_dir(dir), m_visitor(eastl::move(visitor)) {}
        bool await_ready() const { return false; }
        template <typename U>
        void await_suspend(std::coroutine_handle<U> handle) {
            m_parser.walkDirectory(m_dir, eastl::move(m_visitor), [handle, this](bool success) {
                m_success = success;
                handle.resume();
            });
        }
        bool await_resume() { return m_success; }
 
      private:
        ISO9660Parser& m_parser;
        DirEntry m_dir;
        eastl::function<bool(eastl::string_view name, const DirEntry& entry)> m_visitor;
        bool m_success;
    };
    WalkDirectoryAwaiter walkDirectory(const DirEntry& dir,
                                       eastl::function<bool(eastl::string_view name, const DirEntry& entry)> visitor) {
        return WalkDirectoryAwaiter(*this, dir, eastl::move(visitor));
    }
 
    TaskQueue::Task scheduleReadRequest(const ReadRequest* request);
 
    bool initialized() { return m_initialized; }
 
    CDRom* getCDRom() { return m_cdrom; }
 
  private:
    void parseDirEntry(const uint8_t* data, DirEntry* entry);
    eastl::string_view getEntryName(const uint8_t* data);
    void findDirEntry();
    void walkSector();
    void walkDone(bool success);
 
    uint8_t m_buffer[2048];
    eastl::function<void(bool success)> m_callback = nullptr;
    eastl::string_view m_path;
    DirEntry* m_dirEntry = nullptr;
    CDRom* m_cdrom = nullptr;
    uint32_t m_cachedLBA = 0;
    DirEntry m_root;
    DirEntry m_cachedEntry;
    eastl::fixed_string<char, 128> m_cachedPath;
    bool m_initialized = false;
    eastl::function<bool(eastl::string_view name, const DirEntry& entry)> m_walkVisitor = nullptr;
    uint32_t m_walkLBA = 0;
    uint32_t m_walkEnd = 0;
};
 
}  // namespace psyqo