author | truelight |
Thu, 08 Feb 2007 23:46:25 +0000 | |
changeset 5967 | e8c5596608ad |
parent 5584 | 1111b4d36e35 |
child 6179 | d19b0137d8e4 |
permissions | -rw-r--r-- |
2186 | 1 |
/* $Id$ */ |
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#include "stdafx.h" |
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#include "openttd.h" |
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#include "fileio.h" |
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#include "functions.h" |
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#include "string.h" |
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#include "macros.h" |
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#include "variables.h" |
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#include "debug.h" |
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/*************************************************/ |
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/* FILE IO ROUTINES ******************************/ |
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/*************************************************/ |
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#define FIO_BUFFER_SIZE 512 |
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#define MAX_HANDLES 64 |
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typedef struct { |
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byte *buffer, *buffer_end; ///< position pointer in local buffer and last valid byte of buffer |
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uint32 pos; ///< current (system) position in file |
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FILE *cur_fh; ///< current file handle |
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FILE *handles[MAX_HANDLES]; ///< array of file handles we can have open |
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byte buffer_start[FIO_BUFFER_SIZE]; ///< local buffer when read from file |
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#if defined(LIMITED_FDS) |
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uint open_handles; ///< current amount of open handles |
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const char *filename[MAX_HANDLES]; ///< array of filenames we (should) have open |
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uint usage_count[MAX_HANDLES]; ///< count how many times this file has been opened |
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#endif /* LIMITED_FDS */ |
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} Fio; |
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static Fio _fio; |
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// Get current position in file |
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uint32 FioGetPos(void) |
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{ |
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return _fio.pos + (_fio.buffer - _fio.buffer_start) - FIO_BUFFER_SIZE; |
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} |
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void FioSeekTo(uint32 pos, int mode) |
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{ |
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if (mode == SEEK_CUR) pos += FioGetPos(); |
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_fio.buffer = _fio.buffer_end = _fio.buffer_start + FIO_BUFFER_SIZE; |
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_fio.pos = pos; |
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fseek(_fio.cur_fh, _fio.pos, SEEK_SET); |
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} |
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#if defined(LIMITED_FDS) |
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static void FioRestoreFile(int slot) |
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{ |
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/* Do we still have the file open, or should we reopen it? */ |
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if (_fio.handles[slot] == NULL) { |
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DEBUG(misc, 6, "Restoring file '%s' in slot '%d' from disk", _fio.filename[slot], slot); |
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FioOpenFile(slot, _fio.filename[slot]); |
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} |
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_fio.usage_count[slot]++; |
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} |
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#endif /* LIMITED_FDS */ |
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// Seek to a file and a position |
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void FioSeekToFile(uint32 pos) |
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{ |
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FILE *f; |
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#if defined(LIMITED_FDS) |
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/* Make sure we have this file open */ |
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FioRestoreFile(pos >> 24); |
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#endif /* LIMITED_FDS */ |
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f = _fio.handles[pos >> 24]; |
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assert(f != NULL); |
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_fio.cur_fh = f; |
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FioSeekTo(GB(pos, 0, 24), SEEK_SET); |
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} |
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byte FioReadByte(void) |
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{ |
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if (_fio.buffer == _fio.buffer_end) { |
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_fio.pos += FIO_BUFFER_SIZE; |
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fread(_fio.buffer = _fio.buffer_start, 1, FIO_BUFFER_SIZE, _fio.cur_fh); |
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} |
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return *_fio.buffer++; |
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} |
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void FioSkipBytes(int n) |
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{ |
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for (;;) { |
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int m = min(_fio.buffer_end - _fio.buffer, n); |
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_fio.buffer += m; |
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n -= m; |
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if (n == 0) break; |
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FioReadByte(); |
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n--; |
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} |
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} |
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uint16 FioReadWord(void) |
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{ |
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byte b = FioReadByte(); |
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return (FioReadByte() << 8) | b; |
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} |
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uint32 FioReadDword(void) |
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{ |
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uint b = FioReadWord(); |
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return (FioReadWord() << 16) | b; |
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} |
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void FioReadBlock(void *ptr, uint size) |
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{ |
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FioSeekTo(FioGetPos(), SEEK_SET); |
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_fio.pos += size; |
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fread(ptr, 1, size, _fio.cur_fh); |
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} |
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static inline void FioCloseFile(int slot) |
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{ |
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if (_fio.handles[slot] != NULL) { |
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fclose(_fio.handles[slot]); |
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_fio.handles[slot] = NULL; |
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#if defined(LIMITED_FDS) |
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_fio.open_handles--; |
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#endif /* LIMITED_FDS */ |
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} |
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} |
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void FioCloseAll(void) |
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{ |
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int i; |
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for (i = 0; i != lengthof(_fio.handles); i++) |
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FioCloseFile(i); |
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} |
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bool FioCheckFileExists(const char *filename) |
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{ |
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FILE *f = FioFOpenFile(filename); |
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if (f == NULL) return false; |
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fclose(f); |
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return true; |
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} |
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#if defined(LIMITED_FDS) |
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static void FioFreeHandle() |
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{ |
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/* If we are about to open a file that will exceed the limit, close a file */ |
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if (_fio.open_handles + 1 == LIMITED_FDS) { |
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uint i, count; |
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int slot; |
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|
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count = UINT_MAX; |
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slot = -1; |
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/* Find the file that is used the least */ |
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for (i = 0; i < lengthof(_fio.handles); i++) { |
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if (_fio.handles[i] != NULL && _fio.usage_count[i] < count) { |
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count = _fio.usage_count[i]; |
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slot = i; |
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} |
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} |
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assert(slot != -1); |
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DEBUG(misc, 6, "Closing filehandler '%s' in slot '%d' because of fd-limit", _fio.filename[slot], slot); |
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FioCloseFile(slot); |
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} |
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} |
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#endif /* LIMITED_FDS */ |
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|
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FILE *FioFOpenFile(const char *filename) |
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{ |
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FILE *f; |
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char buf[MAX_PATH]; |
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snprintf(buf, lengthof(buf), "%s%s", _paths.data_dir, filename); |
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|
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f = fopen(buf, "rb"); |
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#if !defined(WIN32) |
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if (f == NULL) { |
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strtolower(buf + strlen(_paths.data_dir) - 1); |
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f = fopen(buf, "rb"); |
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|
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#if defined SECOND_DATA_DIR |
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// tries in the 2nd data directory |
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if (f == NULL) { |
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snprintf(buf, lengthof(buf), "%s%s", _paths.second_data_dir, filename); |
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strtolower(buf + strlen(_paths.second_data_dir) - 1); |
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f = fopen(buf, "rb"); |
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} |
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#endif |
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} |
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#endif |
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189 |
|
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return f; |
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} |
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|
0 | 193 |
void FioOpenFile(int slot, const char *filename) |
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{ |
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FILE *f; |
915 | 196 |
|
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#if defined(LIMITED_FDS) |
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FioFreeHandle(); |
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#endif /* LIMITED_FDS */ |
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f = FioFOpenFile(filename); |
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if (f == NULL) error("Cannot open file '%s%s'", _paths.data_dir, filename); |
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FioCloseFile(slot); // if file was opened before, close it |
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_fio.handles[slot] = f; |
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#if defined(LIMITED_FDS) |
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_fio.filename[slot] = filename; |
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_fio.usage_count[slot] = 0; |
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_fio.open_handles++; |
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#endif /* LIMITED_FDS */ |
0 | 210 |
FioSeekToFile(slot << 24); |
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} |