solana-framework/src/nft/mpl-token-metadata/custom/token-record-deserializer.ts

solana-framework is solana uni-tools for typescript

import * as beet from '@metaplex-foundation/beet';
import * as beetSolana from '@metaplex-foundation/beet-solana';
import {tryReadOption} from '.';
import {tokenStateBeet, keyBeet, TokenRecord, tokenDelegateRoleBeet} from "../generated";

/**
 * This is a custom deserializer for TokenRecord in order to support variable account sizes.
 */
export function deserialize(buf: Buffer, offset = 0): [TokenRecord, number] {
    let cursor = offset;

    // key
    const key = keyBeet.read(buf, cursor);
    cursor += keyBeet.byteSize;

    // updateAuthority
    const bump = beet.u8.read(buf, cursor);
    cursor += beet.u8.byteSize;

    // state
    const state = tokenStateBeet.read(buf, cursor);
    cursor += tokenStateBeet.byteSize;

    // ruleSetRevision
    const [ruleSetRevision, ruleSetRevisionDelta] = tryReadOption(
        beet.coption(beet.u64),
        buf,
        cursor,
    );
    cursor += ruleSetRevisionDelta;

    // delegate
    const [delegate, delegateDelta] = tryReadOption(beet.coption(beetSolana.publicKey), buf, cursor);
    cursor += delegateDelta;

    // delegateRole
    const [delegateRole, delegateRoleDelta] = tryReadOption(
        beet.coption(tokenDelegateRoleBeet),
        buf,
        cursor,
    );
    cursor += delegateRoleDelta;

    // lockedTransfer (could be missing)
    const [lockedTransfer, lockedTransferDelta, lockedTransferCorrupted] = tryReadOption(
        beet.coption(beetSolana.publicKey),
        buf,
        cursor,
    );
    cursor += lockedTransferDelta;

    const args = {
        key,
        bump,
        state,
        ruleSetRevision,
        delegate,
        delegateRole,
        lockedTransfer: lockedTransferCorrupted ? null : lockedTransfer,
    };

    return [TokenRecord.fromArgs(args), cursor];
}