?? gif89a.cpp
字號:
#include <fstream.h>
#include <string.h>
#include "gif89a.h"
CGif89a::CGif89a()
{ opened = FALSE;
error = FALSE;
}
CGif89a::CGif89a(LPCSTR fileName,BOOL inMem)
{ opened = 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(LPCSTR 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|ios::nocreate);
if(!ifs)
{ return FALSE;
}
ifs.read(cc,3);
if(strncmp(cc,"GIF",3) != 0)
goto error;
ifs.read(version,3);
version[3] = 0;
if(strncmp(version,"89a",3) > 0)
goto error;
ifs.read((char*)&gInfo.scrWidth,2);
ifs.read((char*)&gInfo.scrHeight,2);
if(!ifs.good())
goto error;
ifs.read((char*)&be,1);
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);
gInfo.BKColorIdx = be;
ifs.read((char*)&be,1);
gInfo.pixelAspectRatio = be;
if(!ifs.good())
goto error;
if(gInfo.gFlag)
{ ifs.read((char*)gColorTable,gInfo.gSize*3);
gInfo.gColorTable = gColorTable;
}
else
gInfo.gColorTable = NULL;
dataStart = ifs.tellg();
if((gInfo.frames = checkFrames(ifs)) == 0)
goto error;
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;
}
ifs.close();
}
opened = TRUE;
return TRUE;
error:
ifs.close();
return FALSE;
}
UINT CGif89a::checkFrames(ifstream& ifs)
{ BYTE be;
BOOL fileEnd = FALSE;
UINT frames=0;
streampos pos = ifs.tellg();
while(!ifs.eof() && !fileEnd)
{ ifs.read((char*)&be,1);
switch(be)
{ case 0x21:
ifs.read((char*)&be,1);
switch(be)
{ case 0xf9:
case 0xfe:
case 0x01:
case 0xff:
while(!ifs.eof())
{ ifs.read((char*)&be,1);
if(be == 0)
break;
ifs.seekg(be,ios::cur);
}
break;
default:
return 0;
}
break;
case 0x2c:
{ BYTE bp;
BOOL lFlag=FALSE;
UINT lSize=1;
frames++;
ifs.seekg(8,ios::cur);
ifs.read((char*)&bp,1);
if((bp&0x80) != 0)
lFlag = TRUE;
lSize <<= ((bp&0x07)+1);
if(lFlag)
ifs.seekg(lSize*3,ios::cur);
if(!ifs.good())
return 0;
ifs.read((char*)&be,1);
while(!ifs.eof())
{ ifs.read((char*)&be,1);
if(be == 0)
break;
ifs.seekg(be,ios::cur);
}
break;
}
case 0x3b:
fileEnd = TRUE;
break;
case 0x00:
break;
default:
return 0;
}
}
ifs.seekg(pos);
return frames;
}
BOOL CGif89a::getAllFrames(ifstream& ifs)
{ BYTE be;
BOOL fileEnd = FALSE;
FRAME *pf = allFrames;
streampos pos = ifs.tellg();
int i;
while(!ifs.eof() && !fileEnd)
{ ifs.read((char*)&be,1);
switch(be)
{ case 0x21:
ifs.read((char*)&be,1);
switch(be)
{ case 0xf9:
while(!ifs.eof())
{ ifs.read((char*)&be,1);
if(be == 0)
break;
if(be == 4)
{ ctrlExt.active = TRUE;
ifs.read((char*)&be,1);
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);
ifs.read((char*)&be,1);
ctrlExt.trsColorIndex = be;
}
else
ifs.seekg(be,ios::cur);
}
break;
case 0xfe:
case 0x01:
case 0xff:
while(!ifs.eof())
{ ifs.read((char*)&be,1);
if(be == 0)
break;
ifs.seekg(be,ios::cur);
}
break;
default:
goto error;
}
break;
case 0x2c:
{ BYTE bp;
ifs.read((char*)&pf->imageLPos,2);
ifs.read((char*)&pf->imageTPos,2);
ifs.read((char*)&pf->imageWidth,2);
ifs.read((char*)&pf->imageHeight,2);
ifs.read((char*)&bp,1);
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);
}
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);
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);
switch(be)
{ case 0x21:
ifs.read((char*)&be,1);
switch(be)
{ case 0xf9:
while(!ifs.eof())
{ ifs.read((char*)&be,1);
if(be == 0)
break;
if(be == 4)
{ ctrlExt.active = TRUE;
ifs.read((char*)&be,1);
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);
ifs.read((char*)&be,1);
ctrlExt.trsColorIndex = be;
}
else
ifs.seekg(be,ios::cur);
}
break;
case 0xfe:
case 0x01:
case 0xff:
while(!ifs.eof())
{ ifs.read((char*)&be,1);
if(be == 0)
break;
ifs.seekg(be,ios::cur);
}
break;
default:
goto error;
}
break;
case 0x2c:
{ BYTE bp;
ifs.read((char*)&curFrame.imageLPos,2);
ifs.read((char*)&curFrame.imageTPos,2);
ifs.read((char*)&curFrame.imageWidth,2);
ifs.read((char*)&curFrame.imageHeight,2);
ifs.read((char*)&bp,1);
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)
ifs.read((char*)curFrame.pColorTable,curFrame.lSize*3);
if(!ifs.good())
goto error;
if(!extractData(&curFrame,ifs))
goto error;
curFrame.ctrlExt = ctrlExt;
if(ctrlExt.active = TRUE)
ctrlExt.active = FALSE;
return &curFrame;
}
case 0x3b:
ifs.seekg(dataStart);
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;
}
return FALSE;
}
BOOL CGif89a::addStrTable(STRING_TABLE_ENTRY* strTable,UINT addIdx,UINT idx,unsigned char c)
{ unsigned char *cc;
UINT l = strTable[idx].len;
if(addIdx >= 4096)
return FALSE;
if((cc = new unsigned char[l+2]) == NULL)
return FALSE;
for(UINT i=0;i<l;i++)
cc[i] = strTable[idx].p[i];
cc[l] = c;
cc[l+1] = 0;
strTable[addIdx].p = cc;
strTable[addIdx].len = strTable[idx].len +1;
return TRUE;
}
BOOL CGif89a::extractData(FRAME* f,ifstream& ifs)
{ STRING_TABLE_ENTRY *strTable;
UINT codeSize,rootSize,tableIndex,codeSizeBK;
int remainInBuf = 0,i;
UINT bufIndex = 0,outIndex = 0;
UINT bitIndex = 0;
DWORD code,oldCode;
BYTE be,*outP;
BYTE buf[262];
BOOL readOK = FALSE;
UINT bufLen = f->imageWidth*f->imageHeight;
if((strTable = new STRING_TABLE_ENTRY[4096]) == NULL)
return FALSE;
ZeroMemory(strTable,sizeof(STRING_TABLE_ENTRY)*4096);
outP = f->dataBuf = new BYTE[bufLen];
if(f->dataBuf == NULL)
{ delete[] strTable;
return FALSE;
}
ifs.read((char*)&be,1);
codeSizeBK = codeSize = be+1;
rootSize = 1;
rootSize <<= be;
tableIndex = rootSize+2;
if(!initStrTable(strTable,rootSize))
goto error;
begin:
if(remainInBuf<=4 && !readOK)
{ for(i=0;i<remainInBuf;i++)
buf[i] = buf[bufIndex+i];
bufIndex = 0;
ifs.read((char*)&be,1);
if(be != 0)
{ ifs.read((char*)(buf+remainInBuf),be);
remainInBuf += be;
}
else
readOK = TRUE;
if(!ifs.good())
goto error;
}
if(remainInBuf<=4)
if(remainInBuf<=0 || codeSize > (remainInBuf*8-bitIndex))
goto done;
code = *((DWORD*)(buf+bufIndex));
code <<= 32-codeSize-bitIndex;
code >>= 32-codeSize;
bitIndex += codeSize;
bufIndex += bitIndex/8;
remainInBuf -= bitIndex/8;
bitIndex %= 8;
if(code >= rootSize+1)
goto error;
if(code == rootSize)
goto begin;
else
{ outP[outIndex++] = *strTable[code].p;
oldCode = code;
}
for(;;)
{ if(remainInBuf<=4 && !readOK)
{ for(i=0;i<remainInBuf;i++)
buf[i] = buf[bufIndex+i];
bufIndex = 0;
ifs.read((char*)&be,1);
if(be != 0)
{ ifs.read((char*)(buf+remainInBuf),be);
remainInBuf += be;
}
else
readOK = TRUE;
if(!ifs.good())
goto error;
}
if(remainInBuf<=4)
if(remainInBuf<=0 || codeSize > (remainInBuf*8-bitIndex))
break;
code = *((DWORD*)(buf+bufIndex));
code <<= 32-codeSize-bitIndex;
code >>= 32-codeSize;
bitIndex += codeSize;
bufIndex += bitIndex/8;
remainInBuf -= bitIndex/8;
bitIndex %= 8;
if(code == rootSize)
{ codeSize = codeSizeBK;
for(i=rootSize;i<4096;i++)
if(strTable[i].p != NULL)
{ delete strTable[i].p;
strTable[i].p = NULL;
strTable[i].len = 0;
}
tableIndex = rootSize+2;
goto begin;
}
else if(code == rootSize+1)
break;
else
{ unsigned char *p = strTable[code].p;
int l = strTable[code].len;
unsigned char c;
if(p != NULL)
{ c = *p;
if(outIndex+l <= bufLen)
for(i=0;i<l;i++)
outP[outIndex++] = *p++;
else
goto error;
if(!addStrTable(strTable,tableIndex++,oldCode,c))
goto error;
oldCode = code;
}
else
{ p = strTable[oldCode].p;
l = strTable[oldCode].len;
c = *p;
if(outIndex+l+1 <= bufLen)
{ for(i=0;i<l;i++)
outP[outIndex++] = *p++;
outP[outIndex++] = c;
}
else
goto error;
if(!addStrTable(strTable,tableIndex++,oldCode,c))
goto error;
oldCode = code;
}
if(tableIndex == (((UINT)1)<<codeSize) && codeSize != 12)
codeSize++;
}
}
done:
for(i=0;i<4096;i++)
if(strTable[i].p != NULL)
{ delete strTable[i].p;
strTable[i].p = NULL;
}
delete[] strTable;
return TRUE;
error:
for(i=0;i<4096;i++)
if(strTable[i].p != NULL)
{ delete strTable[i].p;
strTable[i].p = NULL;
}
delete[] strTable;
delete[] f->dataBuf;
f->dataBuf = NULL;
return FALSE;
}
LPCGLOBAL_INFO CGif89a::getGlobalInfo()
{ return &gInfo;
}
void CGif89a::close()
{ if(opened)
{ opened = FALSE;
if(inMem && allFrames != NULL)
{ FRAME* pf = allFrames;
for(UINT i=0;i<gInfo.frames;i++)
{ if(pf->pColorTable != NULL)
{ delete[] pf->pColorTable;
pf->pColorTable = NULL;
}
if(pf->dataBuf != NULL)
{ delete[] pf->dataBuf;
pf->dataBuf = NULL;
}
}
delete[] allFrames;
allFrames = NULL;
}
if(!inMem)
{ if(curFrame.pColorTable != NULL)
{ delete[] curFrame.pColorTable;
curFrame.pColorTable = NULL;
}
if(curFrame.dataBuf != NULL)
{ delete[] curFrame.dataBuf;
curFrame.dataBuf = NULL;
}
ifs.close();
}
}
}
LPCSTR CGif89a::getVer()
{ return version;
}
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -