from_bcs - [devnet]

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This module provides a number of functions to convert primitive types from their representation in std::bcs to values. This is the opposite of bcs::to_bytes. Note that it is not safe to define a generic public from_bytes function because this can violate implicit struct invariants, therefore only primitive types are offered. If a general conversion back-and-force is needed, consider the aptos_std::Any type which preserves invariants.

Example:

use std::bcs;
use aptos_std::from_bcs;

assert!(from_bcs::to_address(bcs::to_bytes(&@0xabcdef)) == @0xabcdef, 0);

use 0x1::string;

Constants

UTF8 check failed in conversion from bytes to string

const EINVALID_UTF8: u64 = 1;

Functions

`to_bool`

public fun to_bool(v: vector<u8>): bool

Implementation

public fun to_bool(v: vector<u8>): bool {
    from_bytes<bool>(v)
}

`to_u8`

public fun to_u8(v: vector<u8>): u8

Implementation

public fun to_u8(v: vector<u8>): u8 {
    from_bytes<u8>(v)
}

`to_u16`

public fun to_u16(v: vector<u8>): u16

Implementation

public fun to_u16(v: vector<u8>): u16 {
    from_bytes<u16>(v)
}

`to_u32`

public fun to_u32(v: vector<u8>): u32

Implementation

public fun to_u32(v: vector<u8>): u32 {
    from_bytes<u32>(v)
}

`to_u64`

public fun to_u64(v: vector<u8>): u64

Implementation

public fun to_u64(v: vector<u8>): u64 {
    from_bytes<u64>(v)
}

`to_u128`

public fun to_u128(v: vector<u8>): u128

Implementation

public fun to_u128(v: vector<u8>): u128 {
    from_bytes<u128>(v)
}

`to_u256`

public fun to_u256(v: vector<u8>): u256

Implementation

public fun to_u256(v: vector<u8>): u256 {
    from_bytes<u256>(v)
}

`to_address`

public fun to_address(v: vector<u8>): address

Implementation

public fun to_address(v: vector<u8>): address {
    from_bytes<address>(v)
}

`to_bytes`

public fun to_bytes(v: vector<u8>): vector<u8>

Implementation

public fun to_bytes(v: vector<u8>): vector<u8> {
    from_bytes<vector<u8>>(v)
}

`to_string`

public fun to_string(v: vector<u8>): string::String

Implementation

public fun to_string(v: vector<u8>): String {
    // To make this safe, we need to evaluate the utf8 invariant.
    let s = from_bytes<String>(v);
    assert!(string::internal_check_utf8(s.bytes()), EINVALID_UTF8);
    s
}

`from_bytes`

Package private native function to deserialize a type T.

Note that this function does not put any constraint on T. If code uses this function to deserialize a linear value, its their responsibility that the data they deserialize is owned.

Function would abort if T has signer in it.

public(friend) fun from_bytes<T>(bytes: vector<u8>): T

Implementation

native friend fun from_bytes<T>(bytes: vector<u8>): T;

Specification

fun deserialize<T>(bytes: vector<u8>): T;

fun deserializable<T>(bytes: vector<u8>): bool;
axiom<T> forall b1: vector<u8>, b2: vector<u8>:
    ( b1 == b2 ==> deserializable<T>(b1) == deserializable<T>(b2) );
axiom<T> forall b1: vector<u8>, b2: vector<u8>:
    ( b1 == b2 ==> deserialize<T>(b1) == deserialize<T>(b2) );

`from_bytes`

public(friend) fun from_bytes<T>(bytes: vector<u8>): T

pragma opaque;
aborts_if !deserializable<T>(bytes);
ensures result == deserialize<T>(bytes);