C++ EMUFILE::fseek方法代码示例

	u32	readRom(const u32 pos, const u8 size) 
	{
		if (!fROM) return 0xFFFFFFFF;
		
		fROM->fseek(pos, SEEK_SET);
	
		u32 data = 0xFFFFFFFF;
		u32 readed = fROM->fread(&data, size);
		return data;
	}

	void writeSRAM(const u32 pos, const u8 *data, u32 size) 
	{
		if (!fSRAM)
			return;

		fSRAM->fseek(pos, SEEK_SET);

		u32 writed = size;
		fSRAM->fwrite(data, size);
		fSRAM->fflush();
	}

	u32 readSRAM(const u32 pos, const u8 size) 
	{
		if (!fSRAM)
			return 0xFFFFFFFF;
			
		fSRAM->fseek(pos, SEEK_SET);

		u32 data = 0xFFFFFFFF;
		u32 readed = fSRAM->fread(&data, size);
		return data;
	}

	u32 scanSaveTypeGBA()
	{
		if (!fROM) return 0xFF;

		fROM->fseek(0, SEEK_SET);
		int size = fROM->size();

		int lastpct=1;

		int len = fROM->size();
		for(;;)
		{
			u32 tmp;
			u32 readed = fROM->fread(&tmp, 4);

			int pos = fROM->ftell();
			int currPct = pos*100/(size-1);
			for(int i=lastpct;i<currPct;i++)
			{
				if(i%10==0)
					printf(" %d%%\n",i/10*10);
				else printf(".");
				lastpct = currPct;
			}

			if (readed < 4) 
				break;

			if(pos >= len)
				break;


			switch (tmp)
			{
				case EEPROM:
					return 1;
				case SRAM_:
					return 2;
				case FLASH:
				{
					u32 tmp = fROM->read32le();
					return ((tmp == FLASH1M_)?3:5);
				}
				case SIIRTC_V:
					return 4;
			}
		}

		return 0xFF;
	}

static bool dataChunk(EMUFILE &inf)
{
	bool found = false;

	// seek to just after the RIFF header
	inf.fseek(12,SEEK_SET);

	// search for a format chunk
	for (;;)
	{
		char chunk_id[4];
		u32  chunk_length;

		if (inf.eof()) return found;
		if (inf.fread(chunk_id, 4) != 4) return found;
		if (!inf.read_32LE(chunk_length)) return found;

		// if we found a data chunk, excellent!
      if (memcmp(chunk_id, "data", 4) == 0)
	  {
		  found = true;
		  u8 *temp = new u8[chunk_length];
		  if (inf.fread(temp,chunk_length) != chunk_length)
		  {
			  delete[] temp;
			  return false;
		  }
		  newWavData.fwrite(temp,chunk_length);
		  delete[] temp;
		  chunk_length = 0;
	  }

	  inf.fseek(chunk_length,SEEK_CUR);
	}

	return found;
}

bool FCEUSS_SaveMS(EMUFILE* outstream, int compressionLevel)
{
	// reinit memory_savestate
	// memory_savestate is global variable which already has its vector of bytes, so no need to allocate memory every time we use save/loadstate
	memory_savestate.set_len(0);	// this also seeks to the beginning
	memory_savestate.unfail();

	EMUFILE* os = &memory_savestate;

	uint32 totalsize = 0;

	FCEUPPU_SaveState();
	FCEUSND_SaveState();
	totalsize=WriteStateChunk(os,1,SFCPU);
	totalsize+=WriteStateChunk(os,2,SFCPUC);
	totalsize+=WriteStateChunk(os,3,FCEUPPU_STATEINFO);
	totalsize+=WriteStateChunk(os,31,FCEU_NEWPPU_STATEINFO);
	totalsize+=WriteStateChunk(os,4,FCEUCTRL_STATEINFO);
	totalsize+=WriteStateChunk(os,5,FCEUSND_STATEINFO);
	if(FCEUMOV_Mode(MOVIEMODE_PLAY|MOVIEMODE_RECORD|MOVIEMODE_FINISHED))
	{
		totalsize+=WriteStateChunk(os,6,FCEUMOV_STATEINFO);

		//MBG TAS Editor HACK HACK HACK!
		//do not save the movie state if we are in Taseditor! That would be a huge waste of time and space!
		if(!FCEUMOV_Mode(MOVIEMODE_TASEDITOR))
		{
			os->fseek(5,SEEK_CUR);
			int size = FCEUMOV_WriteState(os);
			os->fseek(-(size+5),SEEK_CUR);
			os->fputc(7);
			write32le(size, os);
			os->fseek(size,SEEK_CUR);

			totalsize += 5 + size;
		}
	}
	// save back buffer
	{
		extern uint8 *XBackBuf;
		uint32 size = 256 * 256 + 8;
		os->fputc(8);
		write32le(size, os);
		os->fwrite((char*)XBackBuf,size);
		totalsize += 5 + size;
	}

	if(SPreSave) SPreSave();
	totalsize+=WriteStateChunk(os,0x10,SFMDATA);
	if(SPreSave) SPostSave();

	//save the length of the file
	int len = memory_savestate.size();

	//sanity check: len and totalsize should be the same
	if(len != totalsize)
	{
		FCEUD_PrintError("sanity violation: len != totalsize");
		return false;
	}

	int error = Z_OK;
	uint8* cbuf = (uint8*)memory_savestate.buf();
	uLongf comprlen = -1;
	if(compressionLevel != Z_NO_COMPRESSION && (compressSavestates || FCEUMOV_Mode(MOVIEMODE_TASEDITOR)))
	{
		// worst case compression: zlib says "0.1% larger than sourceLen plus 12 bytes"
		comprlen = (len>>9)+12 + len;
		if (compressed_buf.size() < comprlen) compressed_buf.resize(comprlen);
		cbuf = &compressed_buf[0];
		// do compression
		error = compress2(cbuf, &comprlen, (uint8*)memory_savestate.buf(), len, compressionLevel);
	}

bool FCEUSS_SaveMS(EMUFILE* outstream, int compressionLevel)
{
	//a temp memory stream. we'll dump some data here and then compress
	//TODO - support dumping directly without compressing to save a buffer copy

	EMUFILE_MEMORY ms;
	EMUFILE* os = &ms;

	uint32 totalsize = 0;

	FCEUPPU_SaveState();
	FCEUSND_SaveState();
	totalsize=WriteStateChunk(os,1,SFCPU);
	totalsize+=WriteStateChunk(os,2,SFCPUC);
	totalsize+=WriteStateChunk(os,3,FCEUPPU_STATEINFO);
	totalsize+=WriteStateChunk(os,31,FCEU_NEWPPU_STATEINFO);
	totalsize+=WriteStateChunk(os,4,FCEUCTRL_STATEINFO);
	totalsize+=WriteStateChunk(os,5,FCEUSND_STATEINFO);
	if(FCEUMOV_Mode(MOVIEMODE_PLAY|MOVIEMODE_RECORD|MOVIEMODE_FINISHED))
	{
		totalsize+=WriteStateChunk(os,6,FCEUMOV_STATEINFO);

		//MBG tasedit HACK HACK HACK!
		//do not save the movie state if we are in tasedit! that is a huge waste of time and space!
		if(!FCEUMOV_Mode(MOVIEMODE_TASEDIT))
		{
			os->fseek(5,SEEK_CUR);
			int size = FCEUMOV_WriteState(os);
			os->fseek(-(size+5),SEEK_CUR);
			os->fputc(7);
			write32le(size, os);
			os->fseek(size,SEEK_CUR);

			totalsize += 5 + size;
		}
	}
	// save back buffer
	{
		extern uint8 *XBackBuf;
		uint32 size = 256 * 256 + 8;
		os->fputc(8);
		write32le(size, os);
		os->fwrite((char*)XBackBuf,size);
		totalsize += 5 + size;
	}

	if(SPreSave) SPreSave();
	totalsize+=WriteStateChunk(os,0x10,SFMDATA);
	if(SPreSave) SPostSave();

	//save the length of the file
	int len = ms.size();

	//sanity check: len and totalsize should be the same
	if(len != totalsize)
	{
		FCEUD_PrintError("sanity violation: len != totalsize");
		return false;
	}

	int error = Z_OK;
	uint8* cbuf = (uint8*)ms.buf();
	uLongf comprlen = -1;
	if(compressionLevel != Z_NO_COMPRESSION && compressSavestates)
	{
		//worst case compression.
		//zlib says "0.1% larger than sourceLen plus 12 bytes"
		comprlen = (len>>9)+12 + len;
		cbuf = new uint8[comprlen];
		error = compress2(cbuf,&comprlen,(uint8*)ms.buf(),len,compressionLevel);
	}

bool mic_loadstate(EMUFILE &is, int size)
{
	is.fseek(size, SEEK_CUR);
	return true;
}