gif89a.cpp

服务端: 这是一个完整的基于Wince 4.1图形图象,网络通讯(C/S)模式下的商用程序源代码包.

//#include <fstream.h>
#include "stdafx.h"
#include <string.h>
#include "gif89a.h"

CGif89a::CGif89a()
{	opened = FALSE;
	error = FALSE;
}

CGif89a::CGif89a(LPCTSTR fileName,BOOL inMem)
{   opened = FALSE;  //
	error = FALSE;   //
	if(open(fileName,inMem))
	{	opened = TRUE;
		error = FALSE;
	}
	else
	{	opened = FALSE;
		error = TRUE;
	}
}

CGif89a::~CGif89a()
{	close();
}

BOOL CGif89a::operator!()
{	return error;
}

BOOL CGif89a::open(LPCTSTR filename,BOOL b)
{	char cc[4];
	BYTE be;
	BOOL fileEnd = FALSE;
	inMem = b;
	allFrames = NULL;
	curIndex = 0;
	curFrame.pColorTable = NULL;
	curFrame.dataBuf = NULL;
	ctrlExt.active = FALSE;
	if(opened)
		return FALSE;
	
	//ifs.open(fileName,ios::binary);
	ifs=_tfopen(filename,L"rb");//wince
	//ifs=fopen(filename,"rb");//win32
	if(!ifs)
		return FALSE;
	//ifs.read(cc,3);
	fread((char*)cc,1,3,ifs);
	if(strncmp(cc,"GIF",3) != 0)
		goto error;
	//ifs.read(version,3);
	fread((char*)version,1,3,ifs);
	version[3] = 0;
	if(strncmp(version,"89a",3)!=0 ||strncmp(version,"89a",3)!=0)//???
		goto error;
	//ifs.read((char*)&gInfo.scrWidth,2);
	fread((char*)&gInfo.scrWidth,1,2,ifs);
	//ifs.read((char*)&gInfo.scrHeight,2);
	fread((char*)&gInfo.scrHeight,1,2,ifs);
	//if(!ifs.good())
	//	goto error;
	//ifs.read((char*)&be,1);
	fread((char*)&be,1,1,ifs);
	if((be&0x80) != 0)
		gInfo.gFlag = TRUE;
	else
		gInfo.gFlag = FALSE;
	gInfo.colorRes = ((be&0x70)>>4)+1;
	if(gInfo.gFlag)
	{	if((be&0x08) != 0)
			gInfo.gSort = TRUE;
		else
			gInfo.gSort = FALSE;
		gInfo.gSize = 1;
		gInfo.gSize <<= ((be&0x07)+1);
	}
	//ifs.read((char*)&be,1);
	fread((char*)&be,1,1,ifs);
	gInfo.BKColorIdx = be;
	//ifs.read((char*)&be,1);
	fread((char*)&be,1,1,ifs);
	gInfo.pixelAspectRatio = be;
	//if(!ifs.good())
	//	goto error;
	if(gInfo.gFlag)
	{
		//ifs.read((char*)gColorTable,gInfo.gSize*3);
		fread((char*)gColorTable,1,gInfo.gSize*3,ifs);
		gInfo.gColorTable = gColorTable;
	}
	else
		gInfo.gColorTable = NULL;
	//dataStart = ifs.tellg();
	dataStart=ftell(ifs);
	//skip for speed ,but ginfo.frame also skip,no effect
	if((gInfo.frames = checkFrames(ifs)) == 0)
		goto error;
	fseek(ifs,dataStart,SEEK_SET);//
	if(inMem)
	{	if((allFrames = new FRAME[gInfo.frames]) == NULL)
			goto error;
		ZeroMemory(allFrames,sizeof(FRAME)*gInfo.frames);
		if(!getAllFrames(ifs))
		{	delete[] allFrames;
			allFrames = NULL;
			goto error;
		}
		fclose(ifs);
	}
	opened = TRUE;
	return TRUE;
error:
	//ifs.close();
	fclose(ifs);
	return FALSE;
}

UINT CGif89a::checkFrames(FILE *ifs)
{	BYTE be;
	BOOL fileEnd = FALSE;
	UINT frames=0;
	//streampos pos = ifs.tellg();
	long pos = ftell(ifs);
	//while(!ifs.eof() && !fileEnd)
	while(!feof(ifs) && !fileEnd)
	{	//ifs.read((char*)&be,1);
		fread((char*)&be,1,1,ifs);
		switch(be)
		{	case 0x21:
				//ifs.read((char*)&be,1);
		          fread((char*)&be,1,1,ifs);
				switch(be)
				{	case 0xf9:
					case 0xfe:
					case 0x01:
					case 0xff:
						//while(!ifs.eof())
						while(!feof(ifs))
						{	//ifs.read((char*)&be,1);
							fread((char*)&be,1,1,ifs);
							if(be == 0)
								break;
							//ifs.seekg(be,ios::cur);
							fseek(ifs,be,SEEK_CUR);
						}
						break;
					default:
						return 0;
				}
				break;
			case 0x2c:
			{	BYTE bp;
				BOOL lFlag=FALSE;
				UINT lSize=1;
				frames++;
				//ifs.seekg(8,ios::cur);
				fseek(ifs,8,SEEK_CUR);
				//ifs.read((char*)&bp,1);
                fread((char*)&bp,1,1,ifs);
				if((bp&0x80) != 0)
					lFlag = TRUE;
				lSize <<= ((bp&0x07)+1);
				if(lFlag)
					//ifs.seekg(lSize*3,ios::cur);
					fseek(ifs,lSize*3,SEEK_CUR);
				//if(!ifs.good())
				//	return 0;
				//ifs.read((char*)&be,1);
				    fread((char*)&be,1,1,ifs);
				//while(!ifs.eof())
				while(!feof(ifs))
				{	//ifs.read((char*)&be,1);
					fread((char*)&be,1,1,ifs);
					if(be == 0)
						break;
					//ifs.seekg(be,ios::cur);
					fseek(ifs,be,SEEK_CUR);
				}
				break;
			}
			case 0x3b:
				fileEnd = TRUE;
				break;
			case 0x00:
				break;
			default:
				return 0;
		}
	}
	//ifs.seekg(pos);
	fseek(ifs,pos,SEEK_SET);
	return frames;
}

BOOL CGif89a::getAllFrames(FILE *ifs)
{	BYTE be;
	BOOL fileEnd = FALSE;
	FRAME *pf = allFrames;
	//streampos pos = ifs.tellg();
    long pos=ftell(ifs); 
	int i;
	//while(!ifs.eof() && !fileEnd)
	while(!feof(ifs) && !fileEnd)
	{	//ifs.read((char*)&be,1);
		fread((char*)&be,1,1,ifs);
		switch(be)
		{	case 0x21:
				//ifs.read((char*)&be,1);
		         fread((char*)&be,1,1,ifs);
				switch(be)
				{	case 0xf9:
						//while(!ifs.eof())
				        while(!feof(ifs))
						{	fread((char*)&be,1,1,ifs);
							if(be == 0)
								break;
							if(be == 4)
							{	ctrlExt.active = TRUE;
								//ifs.read((char*)&be,1);
							    fread((char*)&be,1,1,ifs);
								ctrlExt.disposalMethod = (be&0x1c)>>2;
								if((be&0x02) != 0)
									ctrlExt.userInputFlag = TRUE;
								else
									ctrlExt.userInputFlag = FALSE;
								if((be&0x01) != 0)
									ctrlExt.trsFlag = TRUE;
								else
									ctrlExt.trsFlag = FALSE;
								//ifs.read((char*)&ctrlExt.delayTime,2);
								fread((char*)&ctrlExt.delayTime,1,2,ifs);
								//ifs.read((char*)&be,1);
								fread((char*)&be,1,1,ifs);
								ctrlExt.trsColorIndex = be;
							}
							else
								//ifs.seekg(be,ios::cur);
								fseek(ifs,be,SEEK_CUR);
						}
						break;
					case 0xfe:
					case 0x01:
					case 0xff:
						//while(!ifs.eof())
						while(!feof(ifs))
						{	//ifs.read((char*)&be,1);
							fread((char*)&be,1,1,ifs);
							if(be == 0)
								break;
							//ifs.seekg(be,ios::cur);
							fseek(ifs,be,SEEK_CUR);//2006.6.8
						}
						break;
					default:
						goto error;
				}
				break;
			case 0x2c:
			{	BYTE bp;
				//ifs.read((char*)&pf->imageLPos,2);
			     fread((char*)&pf->imageLPos,1,2,ifs);
				//ifs.read((char*)&pf->imageTPos,2);
				 fread((char*)&pf->imageTPos,1,2,ifs);
				//ifs.read((char*)&pf->imageWidth,2);
				 fread((char*)&pf->imageWidth,1,2,ifs);
				//ifs.read((char*)&pf->imageHeight,2);
				 fread((char*)&pf->imageHeight,1,2,ifs);
				//ifs.read((char*)&bp,1);
				 fread((char*)&bp,1,1,ifs);
				if((bp&0x80) != 0)
					pf->lFlag = TRUE;
				if((bp&0x40) != 0)
					pf->interlaceFlag = TRUE;
				if((bp&0x20) != 0)
					pf->sortFlag = TRUE;
				pf->lSize = 1;
				pf->lSize <<= ((bp&0x07)+1);
				if(pf->lFlag)
				{	if((pf->pColorTable = new BYTE[pf->lSize*3]) == NULL)
						goto error;
					//ifs.read((char*)pf->pColorTable,pf->lSize*3);
				    fread((char*)pf->pColorTable,pf->lSize*3,1,ifs);
				}
				//if(!ifs.good())
				//	goto error;
				if(!extractData(pf,ifs))
					goto error;
				if(ctrlExt.active)
				{	pf->ctrlExt = ctrlExt;
					ctrlExt.active = FALSE;
				}
				pf++;
				break;
			}
			case 0x3b:
				fileEnd = TRUE;
				break;
			case 0x00:
				break;
			default:
				goto error;
		}
	}
	//ifs.seekg(pos);
	fseek(ifs,pos,SEEK_SET);
	return TRUE;
error:
	pf = allFrames;
	for(i=0;i<(int)gInfo.frames;i++)
	{	if(pf->pColorTable != NULL)
		{	delete[] pf->pColorTable;
			pf->pColorTable = NULL;
		}
		if(pf->dataBuf != NULL)
		{	delete[] pf->dataBuf;
			pf->dataBuf = NULL;
		}
	}
	return FALSE;
}

LPCFRAME CGif89a::getNextFrame()
{	if(inMem)
	{	FRAME* p =  allFrames+curIndex;
		curIndex++;
		if(curIndex >= gInfo.frames)
			curIndex = 0;
		return p;
	}
	else
	{	BYTE be;
		BOOL fileEnd = FALSE;
		if(curFrame.pColorTable != NULL)
		{	delete[] curFrame.pColorTable;
			curFrame.pColorTable = NULL;
		}
		if(curFrame.dataBuf != NULL)
		{	delete[] curFrame.dataBuf;
			curFrame.dataBuf = NULL;
		}
		ZeroMemory(&curFrame,sizeof(FRAME));
		while(TRUE)
		{	//ifs.read((char*)&be,1);
			 fread((char*)&be,1,1,ifs);
			switch(be)
			{	case 0x21:
					fread((char*)&be,1,1,ifs);
					switch(be)
					{	case 0xf9:
							while(!feof(ifs))
							{	fread((char*)&be,1,1,ifs);
								if(be == 0)
									break;
								if(be == 4)
								{	ctrlExt.active = TRUE;
									fread((char*)&be,1,1,ifs);
									ctrlExt.disposalMethod = (be&0x1c)>>2;
									if((be&0x02) != 0)
										ctrlExt.userInputFlag = TRUE;
									else
										ctrlExt.userInputFlag = FALSE;
									if((be&0x01) != 0)
										ctrlExt.trsFlag = TRUE;
									else
										ctrlExt.trsFlag = FALSE;
									fread((char*)&ctrlExt.delayTime,1,2,ifs);
									fread((char*)&be,1,1,ifs);
									ctrlExt.trsColorIndex = be;
								}
								else
									fseek(ifs,be,SEEK_CUR);
							}
							break;
						case 0xfe:
						case 0x01:
						case 0xff:
							while(!feof(ifs))
							{	fread((char*)&be,1,1,ifs);
								if(be == 0)
									break;
								fseek(ifs,be,SEEK_CUR);
							}
							break;
						default:
							goto error;
					}
					break;
				case 0x2c:
				{	BYTE bp;
					fread((char*)&curFrame.imageLPos,1,2,ifs);
					fread((char*)&curFrame.imageTPos,1,2,ifs);
					fread((char*)&curFrame.imageWidth,1,2,ifs);
					fread((char*)&curFrame.imageHeight,1,2,ifs);
					fread(&bp,1,1,ifs);
					if((bp&0x80) != 0)
						curFrame.lFlag = TRUE;
					if((bp&0x40) != 0)
						curFrame.interlaceFlag = TRUE;
					if((bp&0x20) != 0)
						curFrame.sortFlag = TRUE;
					curFrame.lSize = 1;
					curFrame.lSize <<= ((bp&0x07)+1);
					if((curFrame.pColorTable = new BYTE[curFrame.lSize*3]) == NULL)
						goto error;
					if(curFrame.lFlag)
						fread((char*)curFrame.pColorTable,1,curFrame.lSize*3,ifs);
					//if(!ifs.good())
					//	goto error;
					if(!extractData(&curFrame,ifs))
						goto error;
					curFrame.ctrlExt = ctrlExt;
					if(ctrlExt.active == TRUE) //2005.3.5
						ctrlExt.active = FALSE;
					return &curFrame;
				}
				case 0x3b:
					fseek(ifs,dataStart,SEEK_SET);//
					break;
				case 0x00:
					break;
				default:
					goto error;
			}
		}
		
		return &curFrame;
error:
		if(curFrame.pColorTable != NULL)
		{	delete[] curFrame.pColorTable;
			curFrame.pColorTable = NULL;
		}
		if(curFrame.dataBuf != NULL)
		{	delete[] curFrame.dataBuf;
			curFrame.dataBuf = NULL;
		}
		return NULL;
	}
}

BOOL CGif89a::initStrTable(STRING_TABLE_ENTRY* strTable,UINT rootSize)
{	UINT i;
	unsigned char *cc;
	for(i=0;i<rootSize;i++)
	{	if((cc = new unsigned char[2]) == NULL)
			goto error;
		cc[0] = i,cc[1] = 0;
		strTable[i].p = cc;
		strTable[i].len = 1;
	}
	return TRUE;
error:
	for(i=0;i<rootSize;i++)
		if(strTable[i].p != NULL)
		{	delete[] strTable[i].p;
			strTable[i].p = NULL;
		}