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Location: cpp/openttd-patchpack/source/fileio.c
r1969:287ecec5b3b7
3.3 KiB
text/x-c
(svn r2475) -Fix: [ 1214982 & 1217473 ] realistic acceleration problem. (glx)
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 | #include "stdafx.h"
#include "openttd.h"
#include "fileio.h"
#if defined(UNIX) || defined(__OS2__)
#include <ctype.h> // required for tolower()
#endif
/*************************************************/
/* FILE IO ROUTINES ******************************/
/*************************************************/
#define FIO_BUFFER_SIZE 512
typedef struct {
byte *buffer, *buffer_end;
uint32 pos;
FILE *cur_fh;
FILE *handles[32];
byte buffer_start[512];
} Fio;
static Fio _fio;
// Get current position in file
uint32 FioGetPos(void)
{
return _fio.pos + (_fio.buffer - _fio.buffer_start) - FIO_BUFFER_SIZE;
}
void FioSeekTo(uint32 pos, int mode)
{
if (mode == SEEK_CUR) pos += FioGetPos();
_fio.buffer = _fio.buffer_end = _fio.buffer_start + FIO_BUFFER_SIZE;
fseek(_fio.cur_fh, (_fio.pos=pos), SEEK_SET);
}
// Seek to a file and a position
void FioSeekToFile(uint32 pos)
{
FILE *f = _fio.handles[pos >> 24];
assert(f != NULL);
_fio.cur_fh = f;
FioSeekTo(pos & 0xFFFFFF, SEEK_SET);
}
byte FioReadByte(void)
{
if (_fio.buffer == _fio.buffer_end) {
_fio.pos += FIO_BUFFER_SIZE;
fread(_fio.buffer = _fio.buffer_start, 1, FIO_BUFFER_SIZE, _fio.cur_fh);
}
return *_fio.buffer++;
}
void FioSkipBytes(int n)
{
for(;;) {
int m = min(_fio.buffer_end - _fio.buffer, n);
_fio.buffer += m;
n -= m;
if (n == 0) break;
FioReadByte();
n--;
}
}
uint16 FioReadWord(void)
{
byte b = FioReadByte();
return (FioReadByte() << 8) | b;
}
uint32 FioReadDword(void)
{
uint b = FioReadWord();
return (FioReadWord() << 16) | b;
}
void FioReadBlock(void *ptr, uint size)
{
FioSeekTo(FioGetPos(), SEEK_SET);
_fio.pos += size;
fread(ptr, 1, size, _fio.cur_fh);
}
static inline void FioCloseFile(int slot)
{
if (_fio.handles[slot] != NULL) {
fclose(_fio.handles[slot]);
_fio.handles[slot] = NULL;
}
}
void FioCloseAll(void)
{
int i;
for (i = 0; i != lengthof(_fio.handles); i++)
FioCloseFile(i);
}
bool FiosCheckFileExists(const char *filename)
{
FILE *f;
char buf[MAX_PATH];
sprintf(buf, "%s%s", _path.data_dir, filename);
f = fopen(buf, "rb");
#if !defined(WIN32)
if (f == NULL) {
char *s;
// Make lower case and try again
for(s=buf + strlen(_path.data_dir) - 1; *s != 0; s++)
*s = tolower(*s);
f = fopen(buf, "rb");
#if defined SECOND_DATA_DIR
// tries in the 2nd data directory
if (f == NULL) {
sprintf(buf, "%s%s", _path.second_data_dir, filename);
for(s=buf + strlen(_path.second_data_dir) - 1; *s != 0; s++)
*s = tolower(*s);
f = fopen(buf, "rb");
}
#endif
}
#endif
if (f == NULL)
return false;
else {
fclose(f);
return true;
}
}
void FioOpenFile(int slot, const char *filename)
{
FILE *f;
char buf[MAX_PATH];
sprintf(buf, "%s%s", _path.data_dir, filename);
f = fopen(buf, "rb");
#if !defined(WIN32)
if (f == NULL) {
char *s;
// Make lower case and try again
for(s=buf + strlen(_path.data_dir) - 1; *s != 0; s++)
*s = tolower(*s);
f = fopen(buf, "rb");
#if defined SECOND_DATA_DIR
// tries in the 2nd data directory
if (f == NULL) {
sprintf(buf, "%s%s", _path.second_data_dir, filename);
for(s=buf + strlen(_path.second_data_dir) - 1; *s != 0; s++)
*s = tolower(*s);
f = fopen(buf, "rb");
}
#endif
}
#endif
if (f == NULL)
error("Cannot open file '%s'", buf);
FioCloseFile(slot); // if file was opened before, close it
_fio.handles[slot] = f;
FioSeekToFile(slot << 24);
}
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