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functions:llbase64tostring [2016-12-12 20:24 SLT] sei created |
functions:llbase64tostring [2016-12-12 20:44 SLT] (current) sei Misc fixes |
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| Converts a byte sequence containing $lart[UTF-8] characters, encoded as a $lart[Base64] string, to a $lty[string]. | Converts a byte sequence containing $lart[UTF-8] characters, encoded as a $lart[Base64] string, to a $lty[string]. | ||
| - | That is, the input string is first converted to a $art[Base64]-encoded byte sequence. That byte sequence, taken as a string encoded in $art[UTF-8], is then converted to a LSL Unicode $ty[string]. | + | That is, the input string is first converted to a $art[Base64]-encoded byte sequence. That byte sequence is then interpreted as a string encoded in $art[UTF-8], and converted to a LSL Unicode $ty[string]. |
| ===== Parameters ===== | ===== Parameters ===== | ||
| === base64str === | === base64str === | ||
| - | A $lty[string] expressed in $lart[Base64] that represents the byte string to convert. | + | A $lty[string] expressed in $lart[Base64] that represents the $art[UTF-8] byte sequence to convert. |
| ===== Return value ===== | ===== Return value ===== | ||
| Line 21: | Line 21: | ||
| ===== Notes ===== | ===== Notes ===== | ||
| - | * Invalid $art[UTF-8] characters and NUL characters (U+0000) that are not at the end of the string, are converted to question marks ("?"). If the string ends in a NUL character, it's just stripped. | + | * In the corresponding byte sequence, ''NUL'' characters (U+0000) that are not at the end of the string, and invalid $art[UTF-8] characters, are converted to question marks ("?"). If the string ends in a ''NUL'' character, it's just stripped. |
| + | * In $LSO, in a few cases it's possible to obtain invalid $art[UTF-8] with this function. | ||
| * Padding is ignored; parsing proceeds until the first non-$art[Base64] character is found. | * Padding is ignored; parsing proceeds until the first non-$art[Base64] character is found. | ||
| Line 40: | Line 41: | ||
| s = llBase64ToString("SGVsbG8"); // same (padding is ignored) | s = llBase64ToString("SGVsbG8"); // same (padding is ignored) | ||
| + | |||
| + | s = llBase64ToString("AAAA"); // sets s to "??" | ||
| + | // (trailing NUL is stripped; first two NULs are converted to "?") | ||
| </code> | </code> | ||
| Line 45: | Line 49: | ||
| * $lfn[llStringToBase64] encodes a string as $lart[UTF-8], then the $art[UTF-8] as $lart[Base64]. It's the inverse operation of $fn[llBase64ToString]. | * $lfn[llStringToBase64] encodes a string as $lart[UTF-8], then the $art[UTF-8] as $lart[Base64]. It's the inverse operation of $fn[llBase64ToString]. | ||
| - | * $lfn[llIntegerToBase64] and $lfn[llBase64ToInteger] encode or decode an integer in $art[Base64] representation. | + | * Use $lfn[llIntegerToBase64] and $lfn[llBase64ToInteger] to encode/decode an integer in $art[Base64] representation. |
| * $lfn[llXorBase64] calculates the bitwise XOR of corresponding bytes represented by two $art[Base64] strings, byte by byte. | * $lfn[llXorBase64] calculates the bitwise XOR of corresponding bytes represented by two $art[Base64] strings, byte by byte. | ||
| + | * $lfn[llEscapeURL] and $lfn[llUnescapeURL] also encode/decode a string in $art[UTF-8], but to a different representation (not Base64). | ||