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pragma solidity ^0.4.10;
import "rlp.sol";
contract GasToken2 is Rlp {
//////////////////////////////////////////////////////////////////////////
// Generic ERC20
//////////////////////////////////////////////////////////////////////////
// owner -> amount
mapping(address => uint256) s_balances;
// owner -> spender -> max amount
mapping(address => mapping(address => uint256)) s_allowances;
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
// Spec: Get the account balance of another account with address `owner`
function balanceOf(address owner) public constant returns (uint256 balance) {
return s_balances[owner];
}
function internalTransfer(address from, address to, uint256 value) internal returns (bool success) {
if (value <= s_balances[from]) {
s_balances[from] -= value;
s_balances[to] += value;
Transfer(from, to, value);
return true;
} else {
return false;
}
}
// Spec: Send `value` amount of tokens to address `to`
function transfer(address to, uint256 value) public returns (bool success) {
address from = msg.sender;
return internalTransfer(from, to, value);
}
// Spec: Send `value` amount of tokens from address `from` to address `to`
function transferFrom(address from, address to, uint256 value) public returns (bool success) {
address spender = msg.sender;
if(value <= s_allowances[from][spender] && internalTransfer(from, to, value)) {
s_allowances[from][spender] -= value;
return true;
} else {
return false;
}
}
// Spec: Allow `spender` to withdraw from your account, multiple times, up
// to the `value` amount. If this function is called again it overwrites the
// current allowance with `value`.
function approve(address spender, uint256 value) public returns (bool success) {
address owner = msg.sender;
if (value != 0 && s_allowances[owner][spender] != 0) {
return false;
}
s_allowances[owner][spender] = value;
Approval(owner, spender, value);
return true;
}
// Spec: Returns the `amount` which `spender` is still allowed to withdraw
// from `owner`.
// What if the allowance is higher than the balance of the `owner`?
// Callers should be careful to use min(allowance, balanceOf) to make sure
// that the allowance is actually present in the account!
function allowance(address owner, address spender) public constant returns (uint256 remaining) {
return s_allowances[owner][spender];
}
//////////////////////////////////////////////////////////////////////////
// GasToken specifics
//////////////////////////////////////////////////////////////////////////
uint8 constant public decimals = 2;
string constant public name = "Gastoken.io";
string constant public symbol = "GST2";
// We build a queue of nonces at which child contracts are stored. s_head is
// the nonce at the head of the queue, s_tail is the nonce behind the tail
// of the queue. The queue grows at the head and shrinks from the tail.
// Note that when and only when a contract CREATEs another contract, the
// creating contract's nonce is incremented.
// The first child contract is created with nonce == 1, the second child
// contract is created with nonce == 2, and so on...
// For example, if there are child contracts at nonces [2,3,4],
// then s_head == 4 and s_tail == 1. If there are no child contracts,
// s_head == s_tail.
uint256 s_head;
uint256 s_tail;
// totalSupply gives the number of tokens currently in existence
// Each token corresponds to one child contract that can be SELFDESTRUCTed
// for a gas refund.
function totalSupply() public constant returns (uint256 supply) {
return s_head - s_tail;
}
// Creates a child contract that can only be destroyed by this contract.
function makeChild() internal returns (address addr) {
assembly {
// EVM assembler of runtime portion of child contract:
// ;; Pseudocode: if (msg.sender != 0x0000000000b3f879cb30fe243b4dfee438691c04) { throw; }
// ;; suicide(msg.sender)
// PUSH15 0xb3f879cb30fe243b4dfee438691c04 ;; hardcoded address of this contract
// CALLER
// XOR
// PC
// JUMPI
// CALLER
// SELFDESTRUCT
// Or in binary: 6eb3f879cb30fe243b4dfee438691c043318585733ff
// Since the binary is so short (22 bytes), we can get away
// with a very simple initcode:
// PUSH22 0x6eb3f879cb30fe243b4dfee438691c043318585733ff
// PUSH1 0
// MSTORE ;; at this point, memory locations mem[10] through
// ;; mem[31] contain the runtime portion of the child
// ;; contract. all that's left to do is to RETURN this
// ;; chunk of memory.
// PUSH1 22 ;; length
// PUSH1 10 ;; offset
// RETURN
// Or in binary: 756eb3f879cb30fe243b4dfee438691c043318585733ff6000526016600af3
// Almost done! All we have to do is put this short (31 bytes) blob into
// memory and call CREATE with the appropriate offsets.
let solidity_free_mem_ptr := mload(0x40)
mstore(solidity_free_mem_ptr, 0x00756eb3f879cb30fe243b4dfee438691c043318585733ff6000526016600af3)
addr := create(0, add(solidity_free_mem_ptr, 1), 31)
}
}
// Mints `value` new sub-tokens (e.g. cents, pennies, ...) by creating `value`
// new child contracts. The minted tokens are owned by the caller of this
// function.
function mint(uint256 value) public {
for (uint256 i = 0; i < value; i++) {
require(makeChild() != 0);
}
s_head += value;
s_balances[msg.sender] += value;
}
// Destroys `value` child contracts and updates s_tail.
function destroyChildren(uint256 value) internal {
uint256 tail = s_tail;
// tail points to slot behind the last contract in the queue
for (uint256 i = tail + 1; i <= tail + value; i++) {
require(mk_contract_address(this, i).call.gas(msg.gas)());
}
s_tail = tail + value;
}
// Frees `value` sub-tokens (e.g. cents, pennies, ...) belonging to the
// caller of this function by destroying `value` child contracts, which
// will trigger a partial gas refund.
function free(uint256 value) public returns (bool success) {
uint256 from_balance = s_balances[msg.sender];
if (value > from_balance) {
return false;
}
destroyChildren(value);
s_balances[msg.sender] = from_balance - value;
return true;
}
// Frees up to `value` sub-tokens. Returns how many tokens were freed.
// Otherwise, identical to free.
function freeUpTo(uint256 value) public returns (uint256 freed) {
uint256 from_balance = s_balances[msg.sender];
if (value > from_balance) {
value = from_balance;
}
destroyChildren(value);
s_balances[msg.sender] = from_balance - value;
return value;
}
// Frees `value` sub-tokens owned by address `from`. Requires that `msg.sender`
// has been approved by `from`.
function freeFrom(address from, uint256 value) public returns (bool success) {
address spender = msg.sender;
uint256 from_balance = s_balances[from];
if (value > from_balance) {
return false;
}
mapping(address => uint256) from_allowances = s_allowances[from];
uint256 spender_allowance = from_allowances[spender];
if (value > spender_allowance) {
return false;
}
destroyChildren(value);
s_balances[from] = from_balance - value;
from_allowances[spender] = spender_allowance - value;
return true;
}
// Frees up to `value` sub-tokens owned by address `from`. Returns how many tokens were freed.
// Otherwise, identical to `freeFrom`.
function freeFromUpTo(address from, uint256 value) public returns (uint256 freed) {
address spender = msg.sender;
uint256 from_balance = s_balances[from];
if (value > from_balance) {
value = from_balance;
}
mapping(address => uint256) from_allowances = s_allowances[from];
uint256 spender_allowance = from_allowances[spender];
if (value > spender_allowance) {
value = spender_allowance;
}
destroyChildren(value);
s_balances[from] = from_balance - value;
from_allowances[spender] = spender_allowance - value;
return value;
}
}