Ps2ReadFile::~Ps2ReadFile(void) {
if (_cacheOpRunning)
cacheReadSync();
free(_cacheBuf);
if (_fd >= 0)
fio.close(_fd);
DeleteSema(_sema);
}
void Ps2File::cacheReadAhead() {
if (_cacheOpRunning) {
// there's already some cache read running
if (fio.poll(_fd)) // did it finish?
cacheReadSync(); // yes.
}
if ((!_cacheOpRunning) && ((_readBytesBlock >= CACHE_READ_THRESHOLD) || _stream) && fio.fioAvail()) {
// the engine seems to do sequential reads and there are no other I/Os going on. read ahead.
uint32 cachePosEnd = _cachePos + _bytesInCache;
if (_cachePos > _filePos)
return; // there was a seek in the meantime, don't cache.
if (cachePosEnd - _filePos >= CACHE_FILL_MIN)
return; // cache is full enough.
if (cachePosEnd == _fileSize)
return; // can't read beyond EOF.
assert(cachePosEnd < _fileSize);
if (_cachePos + _bytesInCache <= _filePos) {
_cacheOfs = _bytesInCache = 0;
_cachePos = cachePosEnd = _filePos & ~READ_ALIGN_MASK;
assert(_filePos == _physFilePos);
} else {
uint32 cacheDiff = _filePos - _cachePos;
assert(_bytesInCache >= cacheDiff);
cacheDiff &= ~READ_ALIGN_MASK;
_bytesInCache -= cacheDiff;
_cachePos += cacheDiff;
_cacheOfs = (_cacheOfs + cacheDiff) % CACHE_SIZE;
}
if (_physFilePos != cachePosEnd) {
sioprintf("unexpected _physFilePos %d cache %d %d\n", _physFilePos, _cacheOfs, _bytesInCache);
// assert(!(cachePosEnd & READ_ALIGN_MASK)); // romeo
_physFilePos = fio.seek(_fd, cachePosEnd, SEEK_SET);
if (_physFilePos != cachePosEnd) {
sioprintf("cache seek error: seek to %d instead of %d, fs = %d\n", _physFilePos, cachePosEnd, _fileSize);
return;
}
}
uint32 cacheDest = (_cacheOfs + _bytesInCache) % CACHE_SIZE;
uint32 cacheRead = CACHE_SIZE - _bytesInCache;
if (cacheDest + cacheRead > CACHE_SIZE)
cacheRead = CACHE_SIZE - cacheDest;
if (cacheRead > MAX_READ_STEP)
cacheRead = MAX_READ_STEP;
assert((!(cacheRead & READ_ALIGN_MASK)) && cacheRead);
_cacheOpRunning = true;
fio.read(_fd, _cacheBuf + cacheDest, cacheRead);
}
}
uint32 Ps2ReadFile::read(void *dest, uint32 len) {
WaitSema(_sema);
uint8 *destBuf = (uint8*)dest;
if ((_filePos < _cachePos) || (_filePos + len > _cachePos + _bytesInCache))
cacheReadSync(); // we have to read from CD, sync cache.
while (len && (_filePos != _fileSize)) {
if ((_filePos >= _cachePos) && (_filePos < _cachePos + _bytesInCache)) { // read from cache
uint32 staPos = (_cacheOfs + (_filePos - _cachePos)) % CACHE_SIZE;
uint32 cpyLen = _bytesInCache - (_filePos - _cachePos);
if (cpyLen > len)
cpyLen = len;
if (staPos + cpyLen > CACHE_SIZE)
cpyLen = CACHE_SIZE - staPos;
assert(cpyLen);
memcpy(destBuf, _cacheBuf + staPos, cpyLen);
_filePos += cpyLen;
destBuf += cpyLen;
_readBytesBlock += len;
len -= cpyLen;
} else { // cache miss
assert(!_cacheOpRunning);
if (_physFilePos != _filePos) {
if ((_filePos < _physFilePos) || (_filePos > _physFilePos + (CACHE_SIZE / 2)))
_readBytesBlock = 0; // reset cache hit count
_physFilePos = _filePos & ~READ_ALIGN_MASK;
if (fio.seek(_fd, _physFilePos, SEEK_SET) != (int)_physFilePos)
break; // read beyond EOF
}
int doRead = len + (_filePos - _physFilePos);
doRead = (doRead + READ_ALIGN_MASK) & ~READ_ALIGN_MASK;
if (doRead > MAX_READ_STEP)
doRead = MAX_READ_STEP;
if (doRead < 2048)
doRead = 2048;
fio.read(_fd, _cacheBuf, doRead);
_cachePos = _physFilePos;
_cacheOfs = 0;
_bytesInCache = fio.sync(_fd);
_physFilePos += _bytesInCache;
if (!_bytesInCache)
break; // EOF
}
}
cacheReadAhead();
SignalSema(_sema);
return destBuf - (uint8*)dest;
}
uint32 Ps2File::read(void *dest, uint32 len) {
// uint32 r=0, d=0, ds=0, sz=0;
#ifdef __PS2_FILE_SEMA__
WaitSema(_sema);
#endif
#ifdef __PS2_FILE_DEBUG__
dbg_printf("read (1) : _filePos = %d\n", _filePos);
dbg_printf("read (1) : _cachePos = %d\n", _cachePos);
#endif
if (len == 0) {
#ifdef __PS2_FILE_SEMA__
SignalSema(_sema);
#endif
return 0;
}
if (_filePos >= _fileSize) {
_eof = true;
#ifdef __PS2_FILE_SEMA__
SignalSema(_sema);
#endif
return 0;
}
if ((_filePos+len) > _fileSize) {
len = _fileSize-_filePos;
_eof = true;
}
uint8 *destBuf = (uint8 *)dest;
if ((_filePos < _cachePos) || (_filePos + len > _cachePos + _bytesInCache))
cacheReadSync(); // we have to read from CD, sync cache.
while (len && (_filePos != _fileSize)) {
if ((_filePos >= _cachePos) && (_filePos < _cachePos + _bytesInCache)) { // read from cache
uint32 staPos = (_cacheOfs + (_filePos - _cachePos)) % CACHE_SIZE;
uint32 cpyLen = _bytesInCache - (_filePos - _cachePos);
if (cpyLen > len)
cpyLen = len;
if (staPos + cpyLen > CACHE_SIZE)
cpyLen = CACHE_SIZE - staPos;
assert(cpyLen);
memcpy(destBuf, _cacheBuf + staPos, cpyLen);
_filePos += cpyLen;
destBuf += cpyLen;
_readBytesBlock += len;
len -= cpyLen;
} else { // cache miss
assert(!_cacheOpRunning);
if (_physFilePos != _filePos) {
if ((_filePos < _physFilePos) || (_filePos > _physFilePos + (CACHE_SIZE / 2)))
_readBytesBlock = 0; // reset cache hit count
_physFilePos = _filePos & ~READ_ALIGN_MASK;
if (fio.seek(_fd, _physFilePos, SEEK_SET) != (int)_physFilePos)
break; // read beyond EOF
}
int doRead = len + (_filePos - _physFilePos);
doRead = (doRead + READ_ALIGN_MASK) & ~READ_ALIGN_MASK;
if (doRead > MAX_READ_STEP)
doRead = MAX_READ_STEP;
if (doRead < 2048)
doRead = 2048;
fio.read(_fd, _cacheBuf, doRead);
_cachePos = _physFilePos;
_cacheOfs = 0;
_bytesInCache = fio.sync(_fd);
_physFilePos += _bytesInCache;
if (!_bytesInCache)
break; // EOF
}
}
#ifndef ENABLE_PROFILING
// doesn't play nice with -pg
cacheReadAhead();
#endif
#ifdef __PS2_FILE_SEMA__
SignalSema(_sema);
#endif
return destBuf - (uint8 *)dest;
}
