summaryrefslogtreecommitdiffstatshomepage
path: root/src/emu/fileio.h
blob: 411e211d17bd0298408a623dd1e4442de0935e81 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************

    fileio.h

    Core file I/O interface functions and definitions.

***************************************************************************/

#pragma once

#ifndef MAME_EMU_FILEIO_H
#define MAME_EMU_FILEIO_H

#include "corefile.h"
#include "hash.h"

// some systems use macros for getc/putc rather than functions
#ifdef getc
#undef getc
#endif

//**************************************************************************
//  TYPE DEFINITIONS
//**************************************************************************

// forward declarations
namespace util { class archive_file; }

// ======================> path_iterator

// helper class for iterating over configured paths
class path_iterator
{
public:
	// construction/destruction
	path_iterator(const char *searchpath);

	// getters
	bool next(std::string &buffer, const char *name = nullptr);

	// reset
	void reset() { m_current = m_base; m_index = 0; }

private:
	// internal state
	const char *    m_base;
	const char *    m_current;
	int             m_index;
};



// ======================> file_enumerator

// iterate over all files in all paths specified in the searchpath
class file_enumerator
{
public:
	// construction/destruction
	file_enumerator(const char *searchpath);
	~file_enumerator();

	// iterator
	const osd::directory::entry *next();

private:
	// internal state
	path_iterator       m_iterator;
	osd::directory::ptr m_curdir;
	std::string         m_pathbuffer;
	//int             m_buflen;
};



// ======================> emu_file

class emu_file
{
public:
	// file open/creation
	emu_file(UINT32 openflags);
	emu_file(const char *searchpath, UINT32 openflags);
	virtual ~emu_file();

	// getters
	operator util::core_file &();
	bool is_open() const { return bool(m_file); }
	const char *filename() const { return m_filename.c_str(); }
	const char *fullpath() const { return m_fullpath.c_str(); }
	UINT32 openflags() const { return m_openflags; }
	hash_collection &hashes(const char *types);
	bool restrict_to_mediapath() const { return m_restrict_to_mediapath; }
	bool part_of_mediapath(std::string path);

	// setters
	void remove_on_close() { m_remove_on_close = true; }
	void set_openflags(UINT32 openflags) { assert(!m_file); m_openflags = openflags; }
	void set_restrict_to_mediapath(bool rtmp = true) { m_restrict_to_mediapath = rtmp; }

	// open/close
	osd_file::error open(const char *name);
	osd_file::error open(const char *name1, const char *name2);
	osd_file::error open(const char *name1, const char *name2, const char *name3);
	osd_file::error open(const char *name1, const char *name2, const char *name3, const char *name4);
	osd_file::error open(const char *name, UINT32 crc);
	osd_file::error open(const char *name1, const char *name2, UINT32 crc);
	osd_file::error open(const char *name1, const char *name2, const char *name3, UINT32 crc);
	osd_file::error open(const char *name1, const char *name2, const char *name3, const char *name4, UINT32 crc);
	osd_file::error open_next();
	osd_file::error open_ram(const void *data, UINT32 length);
	void close();

	// control
	osd_file::error compress(int compress);

	// position
	int seek(INT64 offset, int whence);
	UINT64 tell();
	bool eof();
	UINT64 size();

	// reading
	UINT32 read(void *buffer, UINT32 length);
	int getc();
	int ungetc(int c);
	char *gets(char *s, int n);

	// writing
	UINT32 write(const void *buffer, UINT32 length);
	int puts(const char *s);
	int vprintf(util::format_argument_pack<std::ostream> const &args);
	template <typename Format, typename... Params> int printf(Format &&fmt, Params &&...args)
	{
		return vprintf(util::make_format_argument_pack(std::forward<Format>(fmt), std::forward<Params>(args)...));
	}

	// buffers
	void flush();

private:
	bool compressed_file_ready(void);

	// internal helpers
	osd_file::error attempt_zipped();
	osd_file::error load_zipped_file();

	// internal state
	std::string     m_filename;                     // original filename provided
	std::string     m_fullpath;                     // full filename
	util::core_file::ptr m_file;                    // core file pointer
	path_iterator   m_iterator;                     // iterator for paths
	path_iterator   m_mediapaths;                   // media-path iterator
	UINT32          m_crc;                          // file's CRC
	UINT32          m_openflags;                    // flags we used for the open
	hash_collection m_hashes;                       // collection of hashes

	std::unique_ptr<util::archive_file> m_zipfile;  // ZIP file pointer
	dynamic_buffer  m_zipdata;                      // ZIP file data
	UINT64          m_ziplength;                    // ZIP file length

	bool            m_remove_on_close;              // flag: remove the file when closing
	bool            m_restrict_to_mediapath;        // flag: restrict to paths inside the media-path
};

#endif // MAME_EMU_FILEIO_H