Difference between revisions of "LlBase64ToInteger"
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Frionil Fang (talk | contribs) (the return is always predictable: if there's fewer than 6 characters, any incomplete bytes of the integer become 0 (e.g. 5 chars->30 bits->only 3 complete bytes with low byte set to 0)) |
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|return_text=that is '''str''' {{LSLGC|Base64}} decoded as a big endian integer. | |return_text=that is '''str''' {{LSLGC|Base64}} decoded as a big endian integer. | ||
|spec | |spec | ||
|caveats=*If | |caveats=*If {{LSLPT|str}} contains fewer than 6 characters, any incomplete least-significant bytes of the integer are set to 0. | ||
** | **For example, the Base64 value <code>"qqqqqq=="</code> corresponds to the hexadecimal value <code>0xAAAAAAAA</code>. If the padding "=" characters and the last "q" are dropped, there are 5*6=30 bits remaining and those can form only 3 full bytes (24 bits). The result is <code>0xAAAAAA00</code>. | ||
*Returns zero if | **The Base64 value <code>"qqqq"</code> has 4*6=24 bits available, which is enough for the same 3 full bytes. The result is also <code>0xAAAAAA00</code>. | ||
**Similarly, 3-character Base64 has 18 bits, enough for 2 bytes, and 2-character Base64 has 12 bits, enough for one byte. | |||
**Finally, single-character Base64 has only 6 bits and thus no complete bytes, and the result is always zero. | |||
*Returns zero if {{LSLPT|str}} is longer than 8 characters. | |||
|constants | |constants | ||
|examples=< | |examples=<source lang="lsl2"> | ||
integer value = llBase64ToInteger("3q0AAA=="); | integer value = llBase64ToInteger("3q0AAA=="); | ||
// writes out -559087616 | // writes out -559087616 | ||
llOwnerSay((string)value); | llOwnerSay((string)value); | ||
</ | </source> | ||
|helpers | |helpers | ||
|also_functions={{LSL DefineRow||{{LSLG|llIntegerToBase64}}|}} | |also_functions={{LSL DefineRow||{{LSLG|llIntegerToBase64}}|}} | ||
Latest revision as of 09:30, 11 October 2023
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Summary
Function: integer llBase64ToInteger( string str );| 0.0 | Forced Delay |
| 10.0 | Energy |
Returns an integer that is str Base64 decoded as a big endian integer.
| • string | str | – | Base64 string |
Caveats
- If str contains fewer than 6 characters, any incomplete least-significant bytes of the integer are set to 0.
- For example, the Base64 value
"qqqqqq=="corresponds to the hexadecimal value0xAAAAAAAA. If the padding "=" characters and the last "q" are dropped, there are 5*6=30 bits remaining and those can form only 3 full bytes (24 bits). The result is0xAAAAAA00. - The Base64 value
"qqqq"has 4*6=24 bits available, which is enough for the same 3 full bytes. The result is also0xAAAAAA00. - Similarly, 3-character Base64 has 18 bits, enough for 2 bytes, and 2-character Base64 has 12 bits, enough for one byte.
- Finally, single-character Base64 has only 6 bits and thus no complete bytes, and the result is always zero.
- For example, the Base64 value
- Returns zero if str is longer than 8 characters.
Examples
integer value = llBase64ToInteger("3q0AAA==");
// writes out -559087616
llOwnerSay((string)value);
See Also
Deep Notes
Signature |
|---|
function integer llBase64ToInteger( string str ); |