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pragma solidity >=0.0;
import "./safeMath.sol";
import "./owned.sol";
contract tokenDB is safeMath, ownedDB {
struct allowance_s {
uint256 amount;
uint256 nonce;
}
mapping(address => mapping(address => allowance_s)) public allowance;
mapping (address => uint256) public balanceOf;
uint256 public totalSupply;
function increase(address owner, uint256 value) external returns(bool success) {
/*
Increase of balance of the address in database. Only owner can call it.
@owner Address
@value Quantity
@success Was the Function successful?
*/
require( isOwner() );
balanceOf[owner] = safeAdd(balanceOf[owner], value);
totalSupply = safeAdd(totalSupply, value);
return true;
}
function decrease(address owner, uint256 value) external returns(bool success) {
/*
Decrease of balance of the address in database. Only owner can call it.
@owner Address
@value Quantity
@success Was the Function successful?
*/
require( isOwner() );
balanceOf[owner] = safeSub(balanceOf[owner], value);
totalSupply = safeSub(totalSupply, value);
return true;
}
function setAllowance(address owner, address spender, uint256 amount, uint256 nonce) external returns(bool success) {
/*
Set allowance in the database. Only owner can call it.
@owner Owner address
@spender Spender address
@amount Amount to set
@nonce Transaction count
@success Was the Function successful?
*/
require( isOwner() );
allowance[owner][spender].amount = amount;
allowance[owner][spender].nonce = nonce;
return true;
}
function getAllowance(address owner, address spender) public view returns(bool success, uint256 remaining, uint256 nonce) {
/*
Get allowance from the database.
@owner Owner address
@spender Spender address
@success Was the Function successful?
@remaining Remaining amount of the allowance
@nonce Transaction count
*/
return ( true, allowance[owner][spender].amount, allowance[owner][spender].nonce );
}
}
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