Having an excess of 32 individual byte values

Question

Having an excess of 32 individual byte values

My current project involves developing a permission system using bitwise operators. A question came up regarding the limitation of having only 32 permissions in place:

enum permissions {
    none = 0,
    Founder = 1 << 0,
    SeeAdmins = 1 << 1,
    EditAdmins = 1 << 2,
    SeeText = 1 << 3,
    EditText = 1 << 4,
    PublishWork = 1 << 5
}

While the current setup is manageable, there might be scenarios where more than 32 permissions are needed. A quick test yielded these results:

1 << 30 = 1073741824
1 << 31 = -2147483648
1 << 32 = 1

This raises the question of whether it's possible to accommodate more than 32 byte values for permissions. Any insights on this?

javascript typescript byte bitwise-operators

Answer 1

Answer №1

When dealing with permissions, the possibilities are virtually endless in this scenario. However, utilizing a binary mask is not necessary; instead, focus on how to structure your permissions within your database.

If permissions (specifically permission groups) can be represented as single numbers, then using a binary mask is ideal since it can fit within one number.
For more flexibility, consider assigning random IDs to individual permissions and creating unique permission groups, each with their own IDs. This method allows for an infinite number of permissions and controls.

One approach is to continuously add items to your Permission enum without specifically assigning it a number. Typescript will automatically assign incrementing numbers. For example:

enum Permissions {
    none,
    Founder,
    SeeAdmins,
    EditAdmins,
    SeeText,
    EditText,
    PublishWork
}

In the front-end layer, your "permissions group" could simply be an array of permissions:

const accountantPermissionGroup = [
    Permissions.SeeTransactions,
    Permissions.WriteSomeReport,
    Permissions.MoveFunds
];

Answer 2

When dealing with permissions, the possibilities are virtually endless in this scenario. However, utilizing a binary mask is not necessary; instead, focus on how to structure your permissions within your database.

If permissions (specifically permission groups) can be represented as single numbers, then using a binary mask is ideal since it can fit within one number.
For more flexibility, consider assigning random IDs to individual permissions and creating unique permission groups, each with their own IDs. This method allows for an infinite number of permissions and controls.

One approach is to continuously add items to your Permission enum without specifically assigning it a number. Typescript will automatically assign incrementing numbers. For example:

enum Permissions {
    none,
    Founder,
    SeeAdmins,
    EditAdmins,
    SeeText,
    EditText,
    PublishWork
}

In the front-end layer, your "permissions group" could simply be an array of permissions:

const accountantPermissionGroup = [
    Permissions.SeeTransactions,
    Permissions.WriteSomeReport,
    Permissions.MoveFunds
];

Answer 3

Answer №2

Big Integer

1n << 64n
18446744073709551616n

Big Integers allow for the use of common operators such as binary +, -, *, and ** which all function as expected. / and % also work, rounding towards zero when necessary. Bitwise operations |, &, <<, >>, and ^ perform bitwise arithmetic assuming a two’s complement representation for negative values, similar to how they behave for regular Numbers.

Learn more about BigIntegers here

Answer 4

Big Integer

1n << 64n
18446744073709551616n

Big Integers allow for the use of common operators such as binary +, -, *, and ** which all function as expected. / and % also work, rounding towards zero when necessary. Bitwise operations |, &, <<, >>, and ^ perform bitwise arithmetic assuming a two’s complement representation for negative values, similar to how they behave for regular Numbers.

Learn more about BigIntegers here

Having an excess of 32 individual byte values

Answer №1

Answer №2

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