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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#ifdef __PSP__
#include <pspiofilemgr.h>
#include "backends/platform/psp/powerman.h"
#include "backends/fs/psp/psp-stream.h"
#define MIN2(a,b) ((a < b) ? a : b)
#define MIN3(a,b,c) ( (a < b) ? (a < c ? a : c) : (b < c ? b : c) )
//#define __PSP_PRINT_TO_FILE__ /* For debugging suspend stuff, we have no screen output */
//#define __PSP_DEBUG_FUNCS__ /* For debugging function calls */
//#define __PSP_DEBUG_PRINT__ /* For debug printouts */
#include "backends/platform/psp/trace.h"
//#define DEBUG_BUFFERS /* to see the contents of the buffers being read */
#ifdef DEBUG_BUFFERS
void printBuffer(byte *ptr, uint32 len) {
uint32 printLen = len <= 10 ? len : 10;
for (int i = 0; i < printLen; i++) {
PSP_INFO_PRINT("%x ", ptr[i]);
}
if (len > 10) {
PSP_INFO_PRINT("... ");
for (int i = len - 10; i < len; i++)
PSP_INFO_PRINT("%x ", ptr[i]);
}
PSP_INFO_PRINT("\n");
}
#endif
PSPIoStream::PSPIoStream(const Common::String &path, bool writeMode)
: _handle(0), _path(path), _writeMode(writeMode),
_ferror(false), _pos(0),
_physicalPos(0), _fileSize(0), _inCache(false), _eos(false),
_cacheStartOffset(-1), _cache(0),
_errorSuspend(0), _errorSource(0),
_errorPos(0), _errorHandle(0), _suspendCount(0) {
DEBUG_ENTER_FUNC();
// assert(!path.empty()); // do we need this?
}
PSPIoStream::~PSPIoStream() {
DEBUG_ENTER_FUNC();
if (PowerMan.beginCriticalSection())
PSP_DEBUG_PRINT_FUNC("Suspended\n");
PowerMan.unregisterForSuspend(this); // Unregister with powermanager to be suspended
// Must do this before fclose() or resume() will reopen.
sceIoClose(_handle); // We don't need a critical section. Worst case, the handle gets closed on its own
if (_cache)
free(_cache);
PowerMan.endCriticalSection();
}
/* Function to open the file pointed to by the path.
*
*/
void *PSPIoStream::open() {
DEBUG_ENTER_FUNC();
if (PowerMan.beginCriticalSection()) {
// No need to open. Just return the _handle resume() already opened.
PSP_DEBUG_PRINT_FUNC("Suspended\n");
}
_handle = sceIoOpen(_path.c_str(), _writeMode ? PSP_O_RDWR | PSP_O_CREAT : PSP_O_RDONLY, 0777); // open
if (_handle) {
// Get the file size. This way is much faster than going to the end of the file and back
SceIoStat stat;
sceIoGetstat(_path.c_str(), &stat);
_fileSize = *((uint32 *)(void *)&stat.st_size); // 4GB file is big enough for us
PSP_DEBUG_PRINT("%s filesize = %d\n", _path.c_str(), _fileSize);
// Allocate the cache
_cache = (char *)memalign(64, CACHE_SIZE);
}
PowerMan.registerForSuspend(this); // Register with the powermanager to be suspended
PowerMan.endCriticalSection();
return (void *)_handle;
}
bool PSPIoStream::err() const {
DEBUG_ENTER_FUNC();
if (_ferror) // We dump since no printing to screen with suspend
PSP_ERROR("mem_ferror[%d], source[%d], suspend error[%d], pos[%d], \
_errorPos[%d], _errorHandle[%p], suspendCount[%d]\n",
_ferror, _errorSource, _errorSuspend, _pos,
_errorPos, _errorHandle, _suspendCount);
return _ferror;
}
void PSPIoStream::clearErr() {
_ferror = false;
}
bool PSPIoStream::eos() const {
return _eos;
}
int32 PSPIoStream::pos() const {
return _pos;
}
int32 PSPIoStream::size() const {
return _fileSize;
}
bool PSPIoStream::seek(int32 offs, int whence) {
DEBUG_ENTER_FUNC();
PSP_DEBUG_PRINT_FUNC("offset[0x%x], whence[%d], _pos[0x%x], _physPos[0x%x]\n", offs, whence, _pos, _physicalPos);
_eos = false;
int32 posToSearchFor = 0;
switch (whence) {
case SEEK_CUR:
posToSearchFor = _pos;
break;
case SEEK_END:
posToSearchFor = _fileSize; // unsure. Does it take us here or to EOS - 1?
break;
}
posToSearchFor += offs;
// Check for bad values
if (posToSearchFor < 0) {
_ferror = true;
return false;
}
if (posToSearchFor > _fileSize) {
_ferror = true;
_eos = true;
return false;
}
// See if we can find it in cache
if (isOffsetInCache(posToSearchFor)) {
PSP_DEBUG_PRINT("seek offset[0x%x] found in cache. Cache starts[0x%x]\n", posToSearchFor, _cacheStartOffset);
_inCache = true;
} else { // not in cache
_inCache = false;
}
_pos = posToSearchFor;
return true;
}
uint32 PSPIoStream::read(void *ptr, uint32 len) {
DEBUG_ENTER_FUNC();
PSP_DEBUG_PRINT_FUNC("filename[%s], len[0x%x], ptr[%p]\n", _path.c_str(), len, ptr);
if (_ferror || _eos)
return 0;
byte *destPtr = (byte *)ptr;
uint32 lenFromFile = len; // how much we read from the actual file
uint32 lenFromCache = 0; // how much we read from cache
uint32 lenRemainingInFile = _fileSize - _pos;
if (lenFromFile > lenRemainingInFile) {
lenFromFile = lenRemainingInFile;
_eos = true;
}
// Are we in cache?
if (_inCache && isCacheValid()) {
uint32 offsetInCache = _pos - _cacheStartOffset;
// We can read at most what's in the cache or the remaining size of the file
lenFromCache = MIN2(lenFromFile, CACHE_SIZE - offsetInCache); // unsure
PSP_DEBUG_PRINT("reading 0x%x bytes from cache to %p. pos[0x%x] physPos[0x%x] cacheStart[0x%x]\n", lenFromCache, destPtr, _pos, _physicalPos, _cacheStartOffset);
memcpy(destPtr, &_cache[offsetInCache], lenFromCache);
_pos += lenFromCache;
if (lenFromCache < lenFromFile) { // there's more to copy from the file
lenFromFile -= lenFromCache;
lenRemainingInFile -= lenFromCache; // since we moved pos
destPtr += lenFromCache;
} else { // we're done
#ifdef DEBUG_BUFFERS
printBuffer((byte *)ptr, len);
#endif
return lenFromCache; // how much we actually read
}
}
if (PowerMan.beginCriticalSection())
PSP_DEBUG_PRINT_FUNC("Suspended\n");
synchronizePhysicalPos(); // we need to update our physical position
if (lenFromFile <= MIN_READ_SIZE) { // We load the cache in case the read is small enough
// This optimization is based on the principle that reading 1 byte is as expensive as 1000 bytes
uint32 lenToCopyToCache = MIN2((uint32)MIN_READ_SIZE, lenRemainingInFile); // at most remaining file size
PSP_DEBUG_PRINT("filling cache with 0x%x bytes from physicalPos[0x%x]. cacheStart[0x%x], pos[0x%x], fileSize[0x%x]\n", lenToCopyToCache, _physicalPos, _cacheStartOffset, _pos, _fileSize);
int ret = sceIoRead(_handle, _cache, lenToCopyToCache);
if (ret != (int)lenToCopyToCache) {
PSP_ERROR("in filling cache, failed to get 0x%x bytes. Only got 0x%x\n", lenToCopyToCache, ret);
_ferror = true;
}
_cacheStartOffset = _physicalPos;
_inCache = true;
_physicalPos += ret;
PSP_DEBUG_PRINT("copying 0x%x bytes from cache to %p\n", lenFromFile, destPtr);
// Copy to the destination buffer from cache
memcpy(destPtr, _cache, lenFromFile);
_pos += lenFromFile;
} else { // Too big for cache. No caching
PSP_DEBUG_PRINT("reading 0x%x bytes from file to %p. Pos[0x%x], physPos[0x%x]\n", lenFromFile, destPtr, _pos, _physicalPos);
int ret = sceIoRead(_handle, destPtr, lenFromFile);
_physicalPos += ret; // Update pos
_pos = _physicalPos;
if (ret != (int)lenFromFile) { // error
PSP_ERROR("fread returned [0x%x] instead of len[0x%x]\n", ret, lenFromFile);
_ferror = true;
_errorSource = 4;
}
_inCache = false;
}
PowerMan.endCriticalSection();
#ifdef DEBUG_BUFFERS
printBuffer((byte *)ptr, len);
#endif
return lenFromCache + lenFromFile; // total of what was copied
}
// TODO: Test if seeking backwards/forwards has any effect on performance
inline bool PSPIoStream::synchronizePhysicalPos() {
if (_pos != _physicalPos) {
if (sceIoLseek32(_handle, _pos - _physicalPos, PSP_SEEK_CUR) < 0) {
_ferror = true;
return false;
}
_physicalPos = _pos;
}
return true;
}
inline bool PSPIoStream::isOffsetInCache(uint32 offset) {
if (_cacheStartOffset != -1 &&
offset >= (uint32)_cacheStartOffset &&
offset < (uint32)(_cacheStartOffset + CACHE_SIZE))
return true;
return false;
}
uint32 PSPIoStream::write(const void *ptr, uint32 len) {
DEBUG_ENTER_FUNC();
// Check if we can access the file
if (PowerMan.beginCriticalSection())
PSP_DEBUG_PRINT_FUNC("Suspended\n");
PSP_DEBUG_PRINT_FUNC("filename[%s], len[0x%x]\n", _path.c_str(), len);
if (!len || _ferror) // we actually get calls with len=0
return 0;
_eos = false; // we can't have eos with write
synchronizePhysicalPos();
int ret = sceIoWrite(_handle, ptr, len);
// If we're making the file bigger, adjust the size
if (_physicalPos + ret > _fileSize)
_fileSize = _physicalPos + ret;
_physicalPos += ret;
_pos = _physicalPos;
_inCache = false;
_cacheStartOffset = -1; // invalidate cache
if (ret != (int)len) { // Set error
_ferror = true;
_errorSource = 5;
PSP_ERROR("fwrite returned[0x%x] instead of len[0x%x]\n", ret, len);
}
PowerMan.endCriticalSection();
return ret;
}
bool PSPIoStream::flush() {
return true;
}
// For the PSP, since we're building in suspend support, we moved opening
// the actual file to an open function since we need an actual PSPIoStream object to suspend.
//
PSPIoStream *PSPIoStream::makeFromPath(const Common::String &path, bool writeMode) {
DEBUG_ENTER_FUNC();
PSPIoStream *stream = new PSPIoStream(path, writeMode);
if (stream->open() <= 0) {
delete stream;
stream = 0;
}
return stream;
}
/*
* Function to suspend the IO stream (called by PowerManager)
* we can have no output here
*/
int PSPIoStream::suspend() {
DEBUG_ENTER_FUNC();
_suspendCount++;
if (_handle > 0 && _pos < 0) { /* check for error */
_errorSuspend = SuspendError;
_errorPos = _pos;
_errorHandle = _handle;
}
if (_handle > 0) {
sceIoClose(_handle); // close our file descriptor
_handle = 0xFFFFFFFF; // Set handle to non-null invalid value so makeFromPath doesn't return error
}
return 0;
}
/*
* Function to resume the IO stream (called by Power Manager)
*/
int PSPIoStream::resume() {
DEBUG_ENTER_FUNC();
int ret = 0;
_suspendCount--;
// We reopen our file descriptor
_handle = sceIoOpen(_path.c_str(), _writeMode ? PSP_O_RDWR | PSP_O_CREAT : PSP_O_RDONLY, 0777); // open
if (_handle <= 0) {
PSP_ERROR("Couldn't reopen file %s\n", _path.c_str());
}
// Resume our previous position
if (_handle > 0 && _pos > 0) {
ret = sceIoLseek32(_handle, _pos, PSP_SEEK_SET);
_physicalPos = _pos;
_inCache = false;
if (ret < 0) { // Check for problem
_errorSuspend = ResumeError;
_errorPos = _pos;
_errorHandle = _handle;
}
}
return ret;
}
#endif /* __PSP__ */
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