This topic describes the syntax, description, parameters, and return values of miscellaneous functions. This topic also provides examples of these functions.

base64_enc

The following table describes the details about this function.
Item Description
Syntax base64_enc(s [, no_padding])
Description Encodes a string in Base64.
Parameter
  • s: the string that you want to encode.
  • no_padding: specifies whether to pad the string. A value of true specifies that the string is not padded. Default value: false.
Return value Returns a Base64-encoded string.
Example 
if $http_data {
   decdata = base64_dec($http_data)
   say(concat('base64_decdata=', decdata))
   say(concat('base64_encdata=', base64_enc('hello, dsl'))) 
}

Request header: "data: aGVsbG8sIGRzbA=="
Response: base64_decdata=hello, dsl
base64_encdata=aGVsbG8sIGRzbA==

base64_dec

The following table describes the details about this function.
Item Description
Syntax base64_dec(s)
Description Decodes a Base64-encoded string.
Parameter s: the string that you want to decode.
Return value Returns a decoded raw string.
Example 
if $http_data {
   decdata = base64_dec($http_data)
   say(concat('base64_decdata=', decdata))
   say(concat('base64_encdata=', base64_enc('hello, dsl'))) 
}

Request header: "data: aGVsbG8sIGRzbA=="
Response: base64_decdata=hello, dsl
base64_encdata=aGVsbG8sIGRzbA==

url_escape

The following table describes the details about this function.
Item Description
Syntax url_escape(s)
Description Uses URL encoding to encode a string.
Parameter s: the string to be decoded.
Return value Returns a URL-encoded string.
Example 
raw = '/abc/123/ dd/file.m3u8'
esdata = url_escape(raw)
dsdata = url_unescape(esdata)
if eq(raw, dsdata) {
    say(concat('raw=', raw))
    say(concat('dsdata=', dsdata))
}
Output: raw=/abc/123/ dd/file.m3u8
esdata=%2Fabc%2F123%2F%20dd%2Ffile.m3u8
dsdata=/abc/123/ dd/file.m3u8

url_unescape

The following table describes the details about this function.
Item Description
Syntax url_unescape(s)
Description Decodes a URL-encoded string.
Parameter s: the string that you want to decode.
Return value Returns a decoded raw string.
Example 
raw = '/abc/123/ dd/file.m3u8'
esdata = url_escape(raw)
dsdata = url_unescape(esdata)
if eq(raw, dsdata) {
    say(concat('raw=', raw))
    say(concat('dsdata=', dsdata))
}
Output:
raw=/abc/123/ dd/file.m3u8
esdata=%2Fabc%2F123%2F%20dd%2Ffile.m3u8
dsdata=/abc/123/ dd/file.m3u8

rand

The following table describes the details about this function.
Item Description
Syntax rand(n1, n2)
Description Generates and returns a random number. Value values: n1 <= returned number <= n2. The n1 parameter specifies the smallest number. The n2 parameter specifies the greatest number.
Parameter
  • n1: the smallest number.
  • n2: the greatest number.
Return value Returns a random number.
Example 
r = rand(1,100)

rand_hit

The following table describes the details about this function.
Item Description
Syntax rand_hit(ratio)
Description Retrieves a value of true or false based on the specified probability.
Parameter ratio: the probability. Valid values: 0 to 100.
Return value Returns true or false based on the specified probability. If you set ratio to 100, true is returned. If you set ratio to 0, false is returned.
Example 
rand_hit(80)

crc

The following table describes the details about this function.
Item Description
Syntax crc(s)
Description Calculates a Cyclic Redundancy Check (CRC) value.
Parameter s: the string for which you want to calculate a CRC digest.
Return value Returns the CRC value of the string specified by the s parameter.
Example 
crc('hello edgescript')

tonumber

The following table describes the details about this function.
Item Description
Syntax tonumber(s [, base])
Description Converts a string to the numeric type.
Parameter
  • s: the string that you want to convert.
  • base: the positional notation that you want to use to convert the string. Valid values: 10 and 16. Default value: 10.
Example 
n = tonumber('100')
say(concat('tonumber()=', n))

Output: tonumber()=100

base64_enc_safe

The following table describes the details about this function.
Item Description
Syntax base64_enc_safe(str)
Description Encodes a string in Base64. In the encoded string, plus signs (+) are replaced by minus signs (-), forward slashes (/) are replaced by underscores (_), and equal signs (=) are removed.
Parameter str: the string that you want to encode.
Return value Returns a decoded raw string.
Example 
add_rsp_header('X-RESPOND-OUTPUT', concat('base64_enc_safe=', base64_enc_safe('hello, dsl')), true)
Response header:
X-RESPOND-OUTPUT: base64_enc_safe=aGVsbG8sIGRzbA

base64_dec_safe

The following table describes the details about this function.
Item Description
Syntax base64_dec_safe(str)
Description Decodes a Base64-encoded string. In the decoded string, minus signs (-) are replaced by plus signs (+) and underscores (_) are replaced by forward slashes (/). Equal signs (=) are added to the end of the string to ensure that the string is padded to a multiple of four characters.
Parameter str: the Base64-encoded string that you want to decode.
Return value Returns a decoded raw string.
Example 
add_rsp_header('X-RESPOND-OUTPUT', concat('base64_dec_safe=', base64_dec_safe(base64_enc_safe('hello, dsl'))), true)
Response header:
X-RESPOND-OUTPUT:base64_dec_safe=hello, dsl

randomseed

The following table describes the details about this function.
Item Description
Syntax randomseed()
Description Generates a random seed.
Parameter N/A
Return value N/A
Example 
randomseed()
r = rand(1,100)