Changeset - r25410:d53b791515ba
[Not reviewed]
master
0 2 0
Rubidium - 4 years ago 2021-04-13 19:36:24
rubidium@openttd.org
Codechange: use the new RandomAccessFile as backend for the FIO slot functions
2 files changed with 24 insertions and 89 deletions:
0 comments (0 inline, 0 general)
src/fileio.cpp
Show inline comments
 
@@ -9,6 +9,7 @@
 

	
 
#include "stdafx.h"
 
#include "fileio_func.h"
 
#include "random_access_file_type.h"
 
#include "debug.h"
 
#include "fios.h"
 
#include "string_func.h"
 
@@ -29,22 +30,8 @@
 

	
 
#include "safeguards.h"
 

	
 
/** Size of the #Fio data buffer. */
 
#define FIO_BUFFER_SIZE 512
 

	
 
/** Structure for keeping several open files with just one data buffer. */
 
struct Fio {
 
	byte *buffer, *buffer_end;             ///< position pointer in local buffer and last valid byte of buffer
 
	byte buffer_start[FIO_BUFFER_SIZE];    ///< local buffer when read from file
 
	size_t pos;                            ///< current (system) position in file
 
	FILE *cur_fh;                          ///< current file handle
 
	std::string filename;                  ///< current filename
 
	std::array<FILE *, MAX_FILE_SLOTS> handles;        ///< array of file handles we can have open
 
	std::array<std::string, MAX_FILE_SLOTS> filenames; ///< array of filenames we (should) have open
 
	std::array<std::string, MAX_FILE_SLOTS> shortnames;///< array of short names for spriteloader's use
 
};
 

	
 
static Fio _fio; ///< #Fio instance.
 
static RandomAccessFile *_fio_current_file;                       ///< current file handle for the Fio functions
 
static std::array<RandomAccessFile *, MAX_FILE_SLOTS> _fio_files; ///< array of random access files we can have open
 

	
 
/** Whether the working directory should be scanned. */
 
static bool _do_scan_working_directory = true;
 
@@ -58,7 +45,7 @@ extern std::string _highscore_file;
 
 */
 
size_t FioGetPos()
 
{
 
	return _fio.pos + (_fio.buffer - _fio.buffer_end);
 
	return _fio_current_file->GetPos();
 
}
 

	
 
/**
 
@@ -68,7 +55,7 @@ size_t FioGetPos()
 
 */
 
const char *FioGetFilename(uint8 slot)
 
{
 
	return _fio.shortnames[slot].c_str();
 
	return _fio_current_file->GetSimplifiedFilename().c_str();
 
}
 

	
 
/**
 
@@ -78,12 +65,7 @@ const char *FioGetFilename(uint8 slot)
 
 */
 
void FioSeekTo(size_t pos, int mode)
 
{
 
	if (mode == SEEK_CUR) pos += FioGetPos();
 
	_fio.buffer = _fio.buffer_end = _fio.buffer_start + FIO_BUFFER_SIZE;
 
	_fio.pos = pos;
 
	if (fseek(_fio.cur_fh, _fio.pos, SEEK_SET) < 0) {
 
		DEBUG(misc, 0, "Seeking in %s failed", _fio.filename.c_str());
 
	}
 
	_fio_current_file->SeekTo(pos, mode);
 
}
 

	
 
/**
 
@@ -93,11 +75,10 @@ void FioSeekTo(size_t pos, int mode)
 
 */
 
void FioSeekToFile(uint8 slot, size_t pos)
 
{
 
	FILE *f = _fio.handles[slot];
 
	assert(f != nullptr);
 
	_fio.cur_fh = f;
 
	_fio.filename = _fio.filenames[slot];
 
	FioSeekTo(pos, SEEK_SET);
 
	RandomAccessFile *raf = _fio_files[slot];
 
	assert(raf != nullptr);
 
	_fio_current_file = raf;
 
	_fio_current_file->SeekTo(pos, SEEK_SET);
 
}
 

	
 
/**
 
@@ -106,15 +87,7 @@ void FioSeekToFile(uint8 slot, size_t po
 
 */
 
byte FioReadByte()
 
{
 
	if (_fio.buffer == _fio.buffer_end) {
 
		_fio.buffer = _fio.buffer_start;
 
		size_t size = fread(_fio.buffer, 1, FIO_BUFFER_SIZE, _fio.cur_fh);
 
		_fio.pos += size;
 
		_fio.buffer_end = _fio.buffer_start + size;
 

	
 
		if (size == 0) return 0;
 
	}
 
	return *_fio.buffer++;
 
	return _fio_current_file->ReadByte();
 
}
 

	
 
/**
 
@@ -123,14 +96,7 @@ byte FioReadByte()
 
 */
 
void FioSkipBytes(int n)
 
{
 
	for (;;) {
 
		int m = std::min<int>(_fio.buffer_end - _fio.buffer, n);
 
		_fio.buffer += m;
 
		n -= m;
 
		if (n == 0) break;
 
		FioReadByte();
 
		n--;
 
	}
 
	return _fio_current_file->SkipBytes(n);
 
}
 

	
 
/**
 
@@ -139,8 +105,7 @@ void FioSkipBytes(int n)
 
 */
 
uint16 FioReadWord()
 
{
 
	byte b = FioReadByte();
 
	return (FioReadByte() << 8) | b;
 
	return _fio_current_file->ReadWord();
 
}
 

	
 
/**
 
@@ -149,8 +114,7 @@ uint16 FioReadWord()
 
 */
 
uint32 FioReadDword()
 
{
 
	uint b = FioReadWord();
 
	return (FioReadWord() << 16) | b;
 
	return _fio_current_file->ReadDword();
 
}
 

	
 
/**
 
@@ -160,30 +124,15 @@ uint32 FioReadDword()
 
 */
 
void FioReadBlock(void *ptr, size_t size)
 
{
 
	FioSeekTo(FioGetPos(), SEEK_SET);
 
	_fio.pos += fread(ptr, 1, size, _fio.cur_fh);
 
}
 

	
 
/**
 
 * Close the file at the given slot number.
 
 * @param slot File index to close.
 
 */
 
static inline void FioCloseFile(int slot)
 
{
 
	if (_fio.handles[slot] != nullptr) {
 
		fclose(_fio.handles[slot]);
 

	
 
		_fio.shortnames[slot].clear();
 

	
 
		_fio.handles[slot] = nullptr;
 
	}
 
	_fio_current_file->ReadBlock(ptr, size);
 
}
 

	
 
/** Close all slotted open files. */
 
void FioCloseAll()
 
{
 
	for (int i = 0; i != lengthof(_fio.handles); i++) {
 
		FioCloseFile(i);
 
	for (int i = 0; i != lengthof(_fio_files); i++) {
 
		delete _fio_files[i];
 
		_fio_files[i] = nullptr;
 
	}
 
}
 

	
 
@@ -195,24 +144,10 @@ void FioCloseAll()
 
 */
 
void FioOpenFile(int slot, const std::string &filename, Subdirectory subdir)
 
{
 
	FILE *f;
 

	
 
	f = FioFOpenFile(filename, "rb", subdir);
 
	if (f == nullptr) usererror("Cannot open file '%s'", filename.c_str());
 
	long pos = ftell(f);
 
	if (pos < 0) usererror("Cannot read file '%s'", filename.c_str());
 

	
 
	FioCloseFile(slot); // if file was opened before, close it
 
	_fio.handles[slot] = f;
 
	_fio.filenames[slot] = filename;
 

	
 
	/* Store the filename without path and extension */
 
	auto t = filename.rfind(PATHSEPCHAR);
 
	std::string sn = filename.substr(t != std::string::npos ? t + 1 : 0);
 
	_fio.shortnames[slot] = sn.substr(0, sn.rfind('.'));
 
	strtolower(_fio.shortnames[slot]);
 

	
 
	FioSeekToFile(slot, (size_t)pos);
 
	RandomAccessFile *raf = new RandomAccessFile(filename, subdir);
 
	delete _fio_files[slot];
 
	_fio_files[slot] = raf;
 
	_fio_current_file = raf;
 
}
 

	
 
static const char * const _subdirs[] = {
src/random_access_file.cpp
Show inline comments
 
@@ -51,7 +51,7 @@ RandomAccessFile::~RandomAccessFile()
 
 * Get the filename of the opened file with the path from the SubDirectory and the extension.
 
 * @return Name of the file.
 
 */
 
const std::string& RandomAccessFile::GetFilename() const
 
const std::string &RandomAccessFile::GetFilename() const
 
{
 
	return this->filename;
 
}
 
@@ -61,7 +61,7 @@ const std::string& RandomAccessFile::Get
 
 * file without the SubDirectory or extension in lower case.
 
 * @return Name of the file.
 
 */
 
const std::string& RandomAccessFile::GetSimplifiedFilename() const
 
const std::string &RandomAccessFile::GetSimplifiedFilename() const
 
{
 
	return this->simplified_filename;
 
}
0 comments (0 inline, 0 general)