📄 mime之base64编解码.mht
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Date: Tue, 21 Aug 2007 21:45:57 +0800
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>MIME=D6=AEBase64=B1=E0=BD=E2=C2=EB--=CC=EC=BA=DA=BE=CD=
=BB=D8=BC=D2</TITLE>
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<META=20
content=3D"=C4=D0=C8=CB=D3=A6=B8=C3=D6=AA=B5=C0=B5=C4MIME=D6=AEBase64=B1=E0=
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=EB=D4=DD=B2=BB=D0=B4<=CD=DE=CD=DE - II> =B2=A9=BF=CD =
=B2=A9=BF=CD=B6=AF=C1=A6 blog blogdriver blogger =D6=D0=B9=FA"=20
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<BODY>
<DIV id=3Dcontainer>
<DIV id=3Dheader>
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<=CD=DE=CD=DE -=20
II></A></DIV>
<DIV class=3Dentity>
<H2 class=3DdiaryTitle>MIME=D6=AEBase64=B1=E0=BD=E2=C2=EB- -</H2>
<P> &nbs=
p;  =
; =
=20
<P>
<P>Base64=CA=C7MIME=D3=CA=BC=FE=D6=D0=B3=A3=D3=C3=B5=C4=B1=E0=C2=EB=B7=BD=
=CA=BD=D6=AE=D2=BB=A1=A3=CB=FC=B5=C4=D6=F7=D2=AA=CB=BC=CF=EB=CA=C7=BD=AB=CA=
=E4=C8=EB=B5=C4=D7=D6=B7=FB=B4=AE=BB=F2=CA=FD=BE=DD=B1=E0=C2=EB=B3=C9=D6=BB=
=BA=AC=D3=D0{'A'-'Z', 'a'-'z', '0'-'9',=20
'+', =
'/'}=D5=E264=B8=F6=BF=C9=B4=F2=D3=A1=D7=D6=B7=FB=B5=C4=B4=AE=A3=AC=B9=CA=B3=
=C6=CE=AA=A1=B0Base64=A1=B1=A1=A3 </P>
<P>Base64=B1=E0=C2=EB=B5=C4=B7=BD=B7=A8=CA=C7=A3=AC=BD=AB=CA=E4=C8=EB=CA=FD=
=BE=DD=C1=F7=C3=BF=B4=CE=C8=A16 bit=A3=AC=D3=C3=B4=CB6=20
bit=B5=C4=D6=B5(0-63)=D7=F7=CE=AA=CB=F7=D2=FD=C8=A5=B2=E9=B1=ED=A3=AC=CA=E4=
=B3=F6=CF=E0=D3=A6=D7=D6=B7=FB=A1=A3=D5=E2=D1=F9=A3=AC=C3=BF3=B8=F6=D7=D6=
=BD=DA=BD=AB=B1=E0=C2=EB=CE=AA4=B8=F6=D7=D6=B7=FB(3=A1=C18 =A1=FA =
4=A1=C16)=A3=BB=B2=BB=C2=FA4=B8=F6=D7=D6=B7=FB=B5=C4=D2=D4'=3D'=CC=EE=B3=E4=
=A1=A3 </P>
<P>const char EnBase64Tab[] =3D=20
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";<BR>&n=
bsp;<BR>int=20
EncodeBase64(const unsigned char* pSrc, char* pDst, int nSrcLen, int=20
nMaxLineLen)<BR>{<BR> unsigned char c1, c2,=20
c3; // =
=CA=E4=C8=EB=BB=BA=B3=E5=C7=F8=B6=C1=B3=F63=B8=F6=D7=D6=BD=DA<BR> &n=
bsp; int nDstLen =3D=20
0;  =
; //=20
=CA=E4=B3=F6=B5=C4=D7=D6=B7=FB=BC=C6=CA=FD<BR> int =
nLineLen =3D=20
0; //=20
=CA=E4=B3=F6=B5=C4=D0=D0=B3=A4=B6=C8=BC=C6=CA=FD<BR> =
int nDiv =3D nSrcLen /=20
3; // =
=CA=E4=C8=EB=CA=FD=BE=DD=B3=A4=B6=C8=B3=FD=D2=D43=B5=C3=B5=BD=B5=C4=B1=B6=
=CA=FD<BR> int=20
nMod =3D nSrcLen % 3; //=20
=CA=E4=C8=EB=CA=FD=BE=DD=B3=A4=B6=C8=B3=FD=D2=D43=B5=C3=B5=BD=B5=C4=D3=E0=
=CA=FD<BR> <BR> //=20
=C3=BF=B4=CE=C8=A13=B8=F6=D7=D6=BD=DA=A3=AC=B1=E0=C2=EB=B3=C94=B8=F6=D7=D6=
=B7=FB<BR> for (int i =3D 0; i < nDiv; i=20
++)<BR> =
{<BR> //=20
=C8=A13=B8=F6=D7=D6=BD=DA<BR> =
c1 =3D=20
*pSrc++;<BR> c2 =3D=20
*pSrc++;<BR> c3 =3D=20
*pSrc++;<BR> <BR> //=20
=B1=E0=C2=EB=B3=C94=B8=F6=D7=D6=B7=FB<BR> &n=
bsp; *pDst++ =3D EnBase64Tab[c1=20
>> 2];<BR> *pDst++ =3D=20
EnBase64Tab[((c1 << 4) | (c2 >> 4)) &=20
0x3f];<BR> *pDst++ =3D =
EnBase64Tab[((c2=20
<< 2) | (c3 >> 6)) &=20
0x3f];<BR> *pDst++ =3D =
EnBase64Tab[c3=20
& 0x3f];<BR> nLineLen +=3D =
4;<BR> nDstLen +=3D=20
4;<BR> <BR> //=20
=CA=E4=B3=F6=BB=BB=D0=D0=A3=BF<BR> &nb=
sp; if (nLineLen >=20
nMaxLineLen - 4)<BR> =20
{<BR> =
*pDst++=20
=3D =
'\r';<BR> &nbs=
p;=20
*pDst++ =3D=20
'\n';<BR> &nbs=
p;=20
nLineLen =3D=20
0;<BR> =
nDstLen=20
+=3D 2;<BR> =
}<BR> =20
}<BR> <BR> // =
=B1=E0=C2=EB=D3=E0=CF=C2=B5=C4=D7=D6=BD=DA<BR> if =
(nMod =3D=3D=20
1)<BR> {<BR> =
c1 =3D=20
*pSrc++;<BR> *pDst++ =3D =
EnBase64Tab[(c1=20
& 0xfc) >> 2];<BR> =
*pDst++ =3D=20
EnBase64Tab[((c1 & 0x03) <<=20
4)];<BR> *pDst++ =3D=20
'=3D';<BR> *pDst++ =3D=20
'=3D';<BR> nLineLen +=3D=20
4;<BR> nDstLen +=3D=20
4;<BR> }<BR> else if (nMod =3D=3D=20
2)<BR> {<BR> =
c1 =3D=20
*pSrc++;<BR> c2 =3D=20
*pSrc++;<BR> *pDst++ =3D =
EnBase64Tab[(c1=20
& 0xfc) >> 2];<BR> =
*pDst++ =3D=20
EnBase64Tab[((c1 & 0x03) << 4) | ((c2 & 0xf0) >>=20
4)];<BR> *pDst++ =3D =
EnBase64Tab[((c2=20
& 0x0f) << 2)];<BR> =
*pDst++=20
=3D '=3D';<BR> nDstLen +=3D=20
4;<BR> }<BR> <BR> //=20
=CA=E4=B3=F6=BC=D3=B8=F6=BD=E1=CA=F8=B7=FB<BR> *pDst =
=3D '\0';<BR> <BR> =20
return nDstLen;<BR>}</P>
<P>Base64=BD=E2=C2=EB=B7=BD=B7=A8=D6=D0=A3=AC=D7=EE=BC=F2=B5=A5=B5=C4=D2=B2=
=CA=C7=B2=E9=B1=ED=B7=A8=A3=BA=BD=AB64=B8=F6=BF=C9=B4=F2=D3=A1=D7=D6=B7=FB=
=B5=C4=D6=B5=D7=F7=CE=AA=CB=F7=D2=FD=A3=AC=B2=E9=B1=ED=B5=C3=B5=BD=B5=C4=D6=
=B5=A3=A8=B7=B6=CE=A7=CE=AA0-63=A3=A9=D2=C0=B4=CE=C1=AC=C6=F0=C0=B4=A3=AC=
=C6=B4=B4=D5=B3=C9=D7=D6=BD=DA=D0=CE=CA=BD=CA=E4=B3=F6=A3=AC=BE=CD=B5=C3=B5=
=BD=BD=E2=C2=EB=BD=E1=B9=FB=A1=A3=20
</P>
<P>const char DeBase64Tab[] =3D<BR>{<BR> 0, 0, 0, 0, =
0, 0, 0, 0,=20
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,<BR> 0, =
0, 0,=20
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,<BR> =20
62, // =
'+'<BR> 0, 0,=20
0,<BR> 63, =
//=20
'/'<BR> 52, 53, 54, 55, 56, 57, 58, 59, 60,=20
61, // =
'0'-'9'<BR> =20
0, 0, 0, 0, 0, 0, 0,<BR> 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, =
10, 11,=20
12,<BR> 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, =
24,=20
25, // =
'A'-'Z'<BR> =20
0, 0, 0, 0, 0, 0,<BR> 26, 27, 28, 29, 30, 31, 32, 33, =
34, 35,=20
36, 37, 38,<BR> 39, 40, 41, 42, 43, 44, 45, 46, 47, =
48, 49,=20
50, 51, //=20
'a'-'z'<BR>};<BR> <BR>int DecodeBase64(const char* pSrc, unsigned =
char*=20
pDst, int nSrcLen)<BR>{<BR> int=20
nDstLen;  =
; //=20
=CA=E4=B3=F6=B5=C4=D7=D6=B7=FB=BC=C6=CA=FD<BR> int=20
nValue; =
=20
// =
=BD=E2=C2=EB=D3=C3=B5=BD=B5=C4=B3=A4=D5=FB=CA=FD<BR> =
int i;<BR> <BR> i =3D=20
0;<BR> nDstLen =3D 0;<BR> <BR> =
//=20
=C8=A14=B8=F6=D7=D6=B7=FB=A3=AC=BD=E2=C2=EB=B5=BD=D2=BB=B8=F6=B3=A4=D5=FB=
=CA=FD=A3=AC=D4=D9=BE=AD=B9=FD=D2=C6=CE=BB=B5=C3=B5=BD3=B8=F6=D7=D6=BD=DA=
<BR> while (i <=20
nSrcLen)<BR> =
{<BR> =20
if (*pSrc !=3D '\r' &&=20
*pSrc!=3D'\n')<BR> =20
{<BR> =
nValue =3D=20
DeBase64Tab[*pSrc++] <<=20
18;<BR> =
nValue=20
+=3D DeBase64Tab[*pSrc++] <<=20
12;<BR> =
=20
*pDst++ =3D (nValue & 0x00ff0000) >>=20
16;<BR> =
=20
nDstLen++;<BR> <BR> &=
nbsp; =20
if (*pSrc !=3D=20
'=3D')<BR> &nb=
sp;=20
{<BR> &n=
bsp; =20
nValue +=3D DeBase64Tab[*pSrc++] <<=20
6;<BR> &=
nbsp; =20
*pDst++ =3D (nValue & 0x0000ff00) >>=20
8;<BR> &=
nbsp; =20
nDstLen++;<BR> <BR> &=
nbsp; =20
if (*pSrc !=3D=20
'=3D')<BR> &nb=
sp; =20
{<BR> &n=
bsp; =20
nValue +=3D=20
DeBase64Tab[*pSrc++];<BR> =
=20
*pDst++ =3DnValue &=20
0x000000ff;<BR> &nbs=
p; =20
nDstLen++;<BR>  =
; =20
}<BR> =20
}<BR> <BR> &nbs=
p; =20
i +=3D 4;<BR> =20
}<BR> =20
else //=20
=BB=D8=B3=B5=BB=BB=D0=D0=A3=AC=CC=F8=B9=FD<BR> &nb=
sp; =20
{<BR> =20
pSrc++;<BR> &n=
bsp;=20
i++;<BR> =
}<BR> =20
}<BR> <BR> // =
=CA=E4=B3=F6=BC=D3=B8=F6=BD=E1=CA=F8=B7=FB<BR> *pDst =
=3D=20
'\0';<BR> <BR> return nDstLen;<BR>}</P>
<P></P>
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265')"=20
href=3D"javascript:void(0);">kering</A> 2005=C4=EA04=D4=C25=C8=D5, =
=D0=C7=C6=DA=B6=FE 17:08 </P></DIV>
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