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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef M4_FILEIO_SYS_FILE_H
#define M4_FILEIO_SYS_FILE_H
#include "common/file.h"
#include "m4/fileio/fileio.h"
#include "m4/mem/reloc.h"
namespace M4 {
struct Hash_Record {
Common::String filename;
byte hagfile;
byte disks;
uint32 offset;
uint32 size;
};
struct Hag_Statics {
bool hag_flag = false;
bool first_read_flag = false;
Common::Path hash_file;
Hag_Name_Record *hag_name_list = nullptr;
Hag_Record *hag_file_list = nullptr;
};
class SysFile {
private:
Common::Stream *_fp = nullptr;
FileMode fmode;
AccessMode mode = UNOPENED;
int hag_success = 0;
bool show_error_flag = true;
Hag_Record *curr_hag_record = nullptr;
Hash_Record curr_hash_record;
uint32 last_head_pos = 0;
private:
void open_read();
void open_write();
void open_read_low_level();
bool open_hash_file();
Common::String get_last_string(const Common::String &src);
/**
* Calculate key (which is string) into hash table address ie. hash table entry
*/
uint32 key_to_hash_address(const Common::String &src, uint32 hash_table_size);
/**
* Insert a hash record into HASH file depending hash_address. The algorithm is
* if hash_address entry is empty record, put the new record into this entry,
* if the hash_address entry is not empty, search next record of it, util find
* one empty entry and put the new record into the empty entry.
*/
int hash_search(const Common::String &fname, Hash_Record *current_hash_record_ptr, Hag_Record *curr_hag_record, uint32 hash_address,
Common::SeekableReadStream *hashfp, uint32 hash_table_size, bool show_error_flag);
/**
* Opens the file for access, paying attention to the first character..
* if it's a '*', it indicates a MADS folder file
*/
Common::Stream *open_by_first_char();
bool get_local_name_from_hagfile(Common::String &local_name, byte hagfile);
Common::SeekableReadStream *rs() const;
public:
Common::String filename;
public:
SysFile(const Common::String &fname, FileMode myfmode = BINARY);
/**
* Return true if the file exists
*/
bool exists();
/**
* Returns the file size
*/
uint32 size();
/**
* Gets the current position
*/
uint32 get_pos();
/**
* Seek to a given position
*/
bool seek(uint32 pos);
/**
* Seek ahaead by a given amount
*/
bool seek_ahead(int32 amount);
/**
* Read data
*/
uint32 read(MemHandle bufferHandle);
int32 read(MemHandle bufferHandle, int32 n);
int32 read(byte *bufferHandle, int32 n);
/**
* Read in a 8-bit value
*/
byte readByte();
int8 readSByte() {
return (int8)readByte();
}
/**
* Read in a 16-bit value
*/
uint16 readUint16LE();
int16 readSint16LE() {
return (int16)readUint16LE();
}
/**
* Read in a 32-bit value
*/
uint32 readUint32LE();
int32 readSint32LE() {
return (int32)readUint32LE();
}
/**
* Close the file
*/
void close();
};
void sysfile_init(bool in_hag_mode);
void sysfile_shutdown();
} // namespace M4
#endif
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