谁帮帮我把这asp代码转换为php啊<%
OPTION EXPLICIT
const BASE_64_MAP_INIT =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
dim nl
' zero based arrays
dim Base64EncMap(63)
dim Base64DecMap(127) ' must be called before using anything else
PUBLIC SUB initCodecs()
' init vars
nl = "<P>" & chr(13) & chr(10)
' setup base 64
dim max, idx
max = len(BASE_64_MAP_INIT)
for idx = 0 to max - 1
' one based string
Base64EncMap(idx) = mid(BASE_64_MAP_INIT, idx + 1, 1)
next
for idx = 0 to max - 1
Base64DecMap(ASC(Base64EncMap(idx))) = idx
next
END SUB ' encode base 64 encoded string
PUBLIC FUNCTION base64Encode(plain) if len(plain) = 0 then
base64Encode = ""
exit function
end if dim ret, ndx, by3, first, second, third
by3 = (len(plain) \ 3) * 3
ndx = 1
do while ndx <= by3
first = asc(mid(plain, ndx+0, 1))
second = asc(mid(plain, ndx+1, 1))
third = asc(mid(plain, ndx+2, 1))
ret = ret & Base64EncMap( (first \ 4) AND 63 )
ret = ret & Base64EncMap( ((first * 16) AND 48) + ((second \ 16)
AND 15 ) )
ret = ret & Base64EncMap( ((second * 4) AND 60) + ((third \ 64)
AND 3 ) )
ret = ret & Base64EncMap( third AND 63)
ndx = ndx + 3
loop
' check for stragglers
if by3 < len(plain) then
first = asc(mid(plain, ndx+0, 1))
ret = ret & Base64EncMap( (first \ 4) AND 63 )
if (len(plain) MOD 3 ) = 2 then
second = asc(mid(plain, ndx+1, 1))
ret = ret & Base64EncMap( ((first * 16) AND 48) +
((second \
16) AND 15 ) )
ret = ret & Base64EncMap( ((second * 4) AND 60) )
else
ret = ret & Base64EncMap( (first * 16) AND 48)
ret = ret & "="
end if
ret = ret & "="
end if base64Encode = ret
END FUNCTION ' decode base 64 encoded string
PUBLIC FUNCTION base64Decode(scrambled) if len(scrambled) = 0 then
base64Decode = ""
exit function
end if ' ignore padding
dim realLen
realLen = len(scrambled)
do while mid(scrambled, realLen, 1) = "="
realLen = realLen - 1
loop
dim ret, ndx, by4, first, second, third, fourth
ret = ""
by4 = (realLen \ 4) * 4
ndx = 1
do while ndx <= by4
first = Base64DecMap(asc(mid(scrambled, ndx+0, 1)))
second = Base64DecMap(asc(mid(scrambled, ndx+1, 1)))
third = Base64DecMap(asc(mid(scrambled, ndx+2, 1)))
fourth = Base64DecMap(asc(mid(scrambled, ndx+3, 1)))
ret = ret & chr( ((first * 4) AND 255) + ((second \ 16) AND 3)
)
ret = ret & chr( ((second * 16) AND 255) + ((third \ 4) AND
15) )
ret = ret & chr( ((third * 64) AND 255) + (fourth AND 63) )
ndx = ndx + 4
loop
' check for stragglers, will be 2 or 3 characters
if ndx < realLen then
first = Base64DecMap(asc(mid(scrambled, ndx+0, 1)))
second = Base64DecMap(asc(mid(scrambled, ndx+1, 1)))
ret = ret & chr( ((first * 4) AND 255) + ((second \ 16) AND 3)
)
if realLen MOD 4 = 3 then
third = Base64DecMap(asc(mid(scrambled,ndx+2,1)))
ret = ret & chr( ((second * 16) AND 255) + ((third \ 4) AND
15) )
end if
end if base64Decode = ret
END FUNCTION' initialize
call initCodecs' Testing code
' dim inp, encode
' inp = request.QueryString("input")
' encode = base64Encode(inp)
' response.write "Encoded value = " & encode & nl
' response.write "Decoded value = " & base64Decode(encode) & nl
%>我也知道php自带这个功能,但是,我需要用来改编用一用
OPTION EXPLICIT
const BASE_64_MAP_INIT =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
dim nl
' zero based arrays
dim Base64EncMap(63)
dim Base64DecMap(127) ' must be called before using anything else
PUBLIC SUB initCodecs()
' init vars
nl = "<P>" & chr(13) & chr(10)
' setup base 64
dim max, idx
max = len(BASE_64_MAP_INIT)
for idx = 0 to max - 1
' one based string
Base64EncMap(idx) = mid(BASE_64_MAP_INIT, idx + 1, 1)
next
for idx = 0 to max - 1
Base64DecMap(ASC(Base64EncMap(idx))) = idx
next
END SUB ' encode base 64 encoded string
PUBLIC FUNCTION base64Encode(plain) if len(plain) = 0 then
base64Encode = ""
exit function
end if dim ret, ndx, by3, first, second, third
by3 = (len(plain) \ 3) * 3
ndx = 1
do while ndx <= by3
first = asc(mid(plain, ndx+0, 1))
second = asc(mid(plain, ndx+1, 1))
third = asc(mid(plain, ndx+2, 1))
ret = ret & Base64EncMap( (first \ 4) AND 63 )
ret = ret & Base64EncMap( ((first * 16) AND 48) + ((second \ 16)
AND 15 ) )
ret = ret & Base64EncMap( ((second * 4) AND 60) + ((third \ 64)
AND 3 ) )
ret = ret & Base64EncMap( third AND 63)
ndx = ndx + 3
loop
' check for stragglers
if by3 < len(plain) then
first = asc(mid(plain, ndx+0, 1))
ret = ret & Base64EncMap( (first \ 4) AND 63 )
if (len(plain) MOD 3 ) = 2 then
second = asc(mid(plain, ndx+1, 1))
ret = ret & Base64EncMap( ((first * 16) AND 48) +
((second \
16) AND 15 ) )
ret = ret & Base64EncMap( ((second * 4) AND 60) )
else
ret = ret & Base64EncMap( (first * 16) AND 48)
ret = ret & "="
end if
ret = ret & "="
end if base64Encode = ret
END FUNCTION ' decode base 64 encoded string
PUBLIC FUNCTION base64Decode(scrambled) if len(scrambled) = 0 then
base64Decode = ""
exit function
end if ' ignore padding
dim realLen
realLen = len(scrambled)
do while mid(scrambled, realLen, 1) = "="
realLen = realLen - 1
loop
dim ret, ndx, by4, first, second, third, fourth
ret = ""
by4 = (realLen \ 4) * 4
ndx = 1
do while ndx <= by4
first = Base64DecMap(asc(mid(scrambled, ndx+0, 1)))
second = Base64DecMap(asc(mid(scrambled, ndx+1, 1)))
third = Base64DecMap(asc(mid(scrambled, ndx+2, 1)))
fourth = Base64DecMap(asc(mid(scrambled, ndx+3, 1)))
ret = ret & chr( ((first * 4) AND 255) + ((second \ 16) AND 3)
)
ret = ret & chr( ((second * 16) AND 255) + ((third \ 4) AND
15) )
ret = ret & chr( ((third * 64) AND 255) + (fourth AND 63) )
ndx = ndx + 4
loop
' check for stragglers, will be 2 or 3 characters
if ndx < realLen then
first = Base64DecMap(asc(mid(scrambled, ndx+0, 1)))
second = Base64DecMap(asc(mid(scrambled, ndx+1, 1)))
ret = ret & chr( ((first * 4) AND 255) + ((second \ 16) AND 3)
)
if realLen MOD 4 = 3 then
third = Base64DecMap(asc(mid(scrambled,ndx+2,1)))
ret = ret & chr( ((second * 16) AND 255) + ((third \ 4) AND
15) )
end if
end if base64Decode = ret
END FUNCTION' initialize
call initCodecs' Testing code
' dim inp, encode
' inp = request.QueryString("input")
' encode = base64Encode(inp)
' response.write "Encoded value = " & encode & nl
' response.write "Decoded value = " & base64Decode(encode) & nl
%>我也知道php自带这个功能,但是,我需要用来改编用一用
Base64算法将输入的字符串或一段数据编码成只含有{''A''-''Z'', ''a''-''z'', ''0''-''9'', ''+'', ''/''}这64个字符的串,''=''用于填充。其编码的方法是,将输入数据流每次取6 bit,用此6 bit的值(0-63)作为索引去查表,输出相应字符。这样,每3个字节将编码为4个字符(3×8 → 4×6);不满4个字符的以''=''填充。依次原理自己编写程序就是了$dict = "=ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";$in = 'abcd123';
echo base64_encode($in), PHP_EOL;$ar = array_chunk(unpack('C*', $in), 3);
foreach($ar as $r) {
$t[] = $r[0] >> 2;
$t[] = (($r[0] & 0x03) << 4) | (isset($r[1]) ? ($r[1] & 0xf0) >> 4 : 0);
$t[] = isset($r[1]) ? ((($r[1] & 0x0f) << 2) | (isset($r[2]) ? ($r[2] & 0xc0) >> 6 : 0)) : -1;
$t[] = isset($r[2]) ? $r[2] & 0x3f : -1;
}
$s = '';
foreach($t as $v) $s .= $dict{$v+1};
echo $s;YWJjZDEyMw==
YWJjZDEyMw==
$dict = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";$in = 'abcd123';for($i=0,$j=0; $i<strlen($in); $i++) {
$n = ord($in{$i});
switch($i % 3) {
case 0:
$t[$j++] = $n >> 2;
$t[$j] = ($n & 0x03) << 4;
break;
case 1:
$t[$j++] |= ($n & 0xf0) >> 4;
$t[$j] = ($n & 0x0f) << 2;
break;
case 2:
$t[$j++] |= $n >> 6;
$t[$j++] = $n & 0x3f;
}
}
$s = '';
foreach($t as $v) $s .= $dict{$v};
if($n = strlen($s) % 4) $s .= str_repeat('=', 4 - $n);
echo $s, PHP_EOL;