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Cache read/write data to speed up access

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svn-id: r15046
This commit is contained in:
Chris Apers 2004-09-12 13:01:12 +00:00
parent 30d0b6f7ba
commit 609c57c25a
1 changed files with 76 additions and 33 deletions
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109
backends/PalmOS/Src/palmsave.cpp
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@ -22,12 +22,9 @@
#include <ctype.h>
#include "stdafx.h"
#include "common/scummsys.h"
#include "base/engine.h"
#include "scumm/saveload.h"
#include "palm.h"
#define MAX_BLOCK 64000 // store in memory, before dump to file
#define MAX_BLOCK 64000 // store in memory, before dump to file
// SaveFile class
@ -38,14 +35,15 @@ public:
bool isOpen() const { return file != NULL; }
uint32 read(void *buf, uint32 cnt);
uint32 write(const void *buf, uint32 cnt);
uint32 read(void *buf, uint32 size);
uint32 write(const void *buf, uint32 size);
private :
FILE *file;
UInt8 * _readWriteData;
UInt8 *_readWriteData;
UInt32 _readWritePos;
bool _needDump;
UInt32 length;
};
PalmSaveFile::PalmSaveFile(const char *filename, bool saveOrLoad) {
@ -54,57 +52,102 @@ PalmSaveFile::PalmSaveFile(const char *filename, bool saveOrLoad) {
_needDump = false;
file = ::fopen(filename, (saveOrLoad ? "wb" : "rb"));
if (file) {
if (saveOrLoad) {
_readWriteData = (byte *)malloc(MAX_BLOCK);
} else {
// read : cache the whole file
::fseek(file, 0, SEEK_END);
length = ::ftell(file);
::fseek(file, 0, SEEK_SET);
_readWriteData = (byte *)malloc(length);
_readWritePos = 0;
if (_readWriteData)
::fread(_readWriteData, 1, length, file);
}
}
}
PalmSaveFile::~PalmSaveFile() {
if (file) {
if (_needDump && _readWriteData) {
if (_needDump)
::fwrite(_readWriteData, _readWritePos, 1, file);
if (_readWriteData)
free(_readWriteData);
}
::fclose(file);
}
}
uint32 PalmSaveFile::read(void *buf, uint32 cnt) {
return ::fread(buf, 1, cnt, file);
}
uint32 PalmSaveFile::read(void *buf, uint32 size) {
if (!_readWriteData)
// we must return the size, where fread return nitems upon success ( 1 <=> size)
return (::fread(buf, 1, size, file));
uint32 PalmSaveFile::write(const void *buf, uint32 cnt) {
UInt32 fullsize = cnt;
if (fullsize <= MAX_BLOCK)
{
if (!_readWriteData)
_readWriteData = (byte *)malloc(MAX_BLOCK);
if ((_readWritePos+fullsize)>MAX_BLOCK) {
::fwrite(_readWriteData, _readWritePos, 1, file);
_readWritePos = 0;
_needDump = false;
}
MemMove(_readWriteData + _readWritePos, buf, fullsize);
_readWritePos += fullsize;
_needDump = true;
return cnt;
if (_readWritePos < length) {
MemMove(buf, _readWriteData + _readWritePos, size);
_readWritePos += size;
return size;
}
return ::fwrite(buf, 1, cnt, file);
return 0;
}
uint32 PalmSaveFile::write(const void *buf, uint32 size) {
if (_readWriteData) {
if ((_readWritePos + size) > MAX_BLOCK) {
if (_readWritePos > 0)
::fwrite(_readWriteData, _readWritePos, 1, file);
_readWritePos = 0;
_needDump = false;
} else {
// save new block
MemMove(_readWriteData + _readWritePos, buf, size);
_readWritePos += size;
_needDump = true;
return size;
}
}
// we must return the size, where fwrite return nitems upon success ( 1 <=> size)
return ::fwrite(buf, 1, size, file);
}
// SaveFileManager class
class PalmSaveFileManager : public DefaultSaveFileManager {
class PalmSaveFileManager : public SaveFileManager {
public:
SaveFile *open_savefile(const char *filename, const char *directory, bool saveOrLoad);
void list_savefiles(const char *prefix, const char *directory, bool *marks, int num);
protected:
SaveFile *makeSaveFile(const char *filename, bool saveOrLoad);
};
SaveFile *PalmSaveFileManager::open_savefile(const char *filename, const char *directory, bool saveOrLoad) {
char buf[256];
strncpy(buf, directory, sizeof(buf));
strncat(buf, filename, sizeof(buf));
SaveFile *sf = makeSaveFile(buf, saveOrLoad);
if (!sf->isOpen()) {
delete sf;
sf = NULL;
}
return sf;
}
void PalmSaveFileManager::list_savefiles(const char *prefix, const char *directory, bool *marks, int num) {
FileRef fileRef;
// try to open the dir