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improve broken llBase64ToInteger

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This commit is contained in:
UbitUmarov
2024-05-11 14:09:08 +01:00
parent 57c1e15428
commit 3e4f4208b2
1 changed files with 35 additions and 41 deletions
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76
OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
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@@ -12047,8 +12047,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
// redundancy).
// </para>
// <para>
// LSL requires a base64 string to be 8
// characters in length. LSL also uses '/'
// LSL also uses '/'
// rather than '-' (MIME compliant).
// </para>
// <para>
@@ -12060,6 +12059,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
// these functions, so the string to integer
// conversion returns '0' if an invalid
// character is encountered during conversion.
// Only full bytes are considered, partial are counted as 0
// </para>
// <para>
// References
@@ -12213,59 +12213,53 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
public LSL_Integer llBase64ToInteger(string str)
{
int number = 0;
int digit;
// Require a well-fromed base64 string
if (str.Length > 8)
if (str is null || str.Length < 2 || str.Length > 8)
return 0;
// The loop is unrolled in the interests
// of performance and simple necessity.
//
// MUST find 6 digits to be well formed
// -1 == invalid
// 0 == padding
int digit;
if ((digit = c2itable[str[0]]) <= 0)
{
return digit < 0 ? (int)0 : number;
}
number += --digit<<26;
return 0;
int number = --digit << 26;
if ((digit = c2itable[str[1]]) <= 0)
{
return digit < 0 ? (int)0 : number;
}
number += --digit<<20;
return 0;
if (str.Length == 2)
return number | (--digit & 0x30) << 20;
int next = --digit << 20;
if ((digit = c2itable[str[2]]) <= 0)
{
return digit < 0 ? (int)0 : number;
}
number += --digit<<14;
return number;
number |= next;
if (str.Length == 3)
return number | (--digit & 0x3C) << 14;
next = --digit << 14;
if ((digit = c2itable[str[3]]) <= 0)
{
return digit < 0 ? (int)0 : number;
}
number += --digit<<8;
return number;
number |= next;
number |= --digit << 8;
if (str.Length == 4)
return number;
if ((digit = c2itable[str[4]]) <= 0)
{
return digit < 0 ? (int)0 : number;
}
number += --digit<<2;
return number;
if (str.Length == 5)
return number;
next = --digit << 2;
if ((digit = c2itable[str[5]]) <= 0)
{
return digit < 0 ? (int)0 : number;
}
number += --digit>>4;
return number;
// ignore trailing padding
number |= next;
number |= --digit >> 4;
return number;
}