iso_fs.h

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/*
Copyright (c) 2010 Peter "Corsix" Cawley
 
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.
*/
 
#ifndef CORSIX_TH_ISO_FS_H_
#define CORSIX_TH_ISO_FS_H_
 
#include "config.h"
 
#include <cstdio>
#include <memory>
#include <string>
#include <string_view>
#include <vector>
 
 
class iso_filesystem {
 public:
  static constexpr size_t min_sector_size = 2048;
 
 
  explicit iso_filesystem(const char* path, char pathSeparator = '/');
  ~iso_filesystem() = default;
 
 
  std::string_view get_error() const;
 
  using file_handle = int;
 
 
  file_handle find_file(const char* sPath) const;
 
 
  void visit_directory_files(const char* sPath,
                             void (*fnCallback)(void*, const char*,
                                                const char*),
                             void* pCallbackData) const;
 
  static inline bool is_handle_good(file_handle x) { return x != 0; }
 
 
  uint32_t get_file_start(file_handle iFile) const;
 
 
  uint32_t get_file_size(file_handle iFile) const;
 
 
  bool get_file_data(file_handle iFile, uint8_t* pBuffer);
 
 private:
  struct file_metadata {
    std::string path;
    uint32_t sector;
    uint32_t size;
  };
 
  std::unique_ptr<std::FILE, int (*)(std::FILE*)> raw_file;
  std::string error{};
  std::vector<file_metadata> files;
  long sector_size{min_sector_size};
  char path_seperator;
 
  void set_error(const char* sFormat, ...);
 
  bool seek_to_sector(uint32_t iSector);
 
  bool read_data(uint32_t iByteCount, uint8_t* pBuffer);
 
 
  int find_hosp_directory(const uint8_t* pDirEnt, const uint32_t dirEntsSize,
                          int level);
 
 
  void build_file_lookup_table(uint32_t iSector, uint32_t dirEntsSize,
                               std::string_view prefix);
 
  static bool file_metadata_less(const file_metadata& lhs,
                                 const file_metadata& rhs);
};
 
#endif