LibSwap

struct SwapData {
    uint16 amountsOffset;
    uint16 dataOffset;
    uint16 commandsOffset;
    uint16 commandsOffsetEnd;
    uint256 amountIn;
    address toAddress;
    address fromAssetAddress;
    address toAssetAddress;
    uint256 deadline;
    uint256 amountOutMin;
}

Field	Type	Description
amountsOffset	uint16	This is a 16-bit unsigned integer representing the offset for the amounts section in the transaction calldata. Offsets are used to locate specific data within a block of calldata.
dataOffset	uint16	Similar to amountsOffset, this is a 16-bit unsigned integer representing the offset for another data section in the calldata. The specific nature of this data depends on the context in which SwapData is used.
commandsOffset	uint16	This is a 16-bit unsigned integer indicating the starting point of the commands section in the calldata. Commands in the context of a swap refers to specific actions.
commandsOffsetEnd	uint16	This is a 16-bit unsigned integer marking the end of the commands section in the calldata. Knowing the start and end of the commands section helps in parsing and executing them correctly.
amountIn	uint256	A 256-bit unsigned integer representing the amount of the asset being provided in the swap.
toAddress	address	This is the Ethereum address to which the output of the swap (the swapped asset) will be sent.
fromAssetAddress	address	The Ethereum address of the asset being swapped from. This could be the contract address of an ERC-20 token or another type of asset.
toAssetAddress	address	The Ethereum address of the asset being swapped to. Like fromAssetAddress, this is typically the contract address of the target ERC-20 token or other asset types.
deadline	uint256	A timestamp (usually in seconds since the Unix epoch) indicating the deadline by which the swap must be completed.
amountOutMin	uint256	The minimum amount of the output asset that must be received for the swap to be considered successful.

struct SwapState {
    uint256 lastAmountOut;
    uint256 balance;
}

Field	Type	Description
lastAmountOut	uint256	This is a 256-bit unsigned integer that stores the amount of the asset that was last received from a swap operation.
balance	uint256	this field holds the balance of an account or contract in relation to the swap operation.

getAmountIn():

getAmountIn is a function that iterates over a portion of the transaction calldata, extracting and summing up amounts of an asset.

Input:

Field	Type	Description
startOffset	uint16	The location starting position
endOffset	uint16	The location ending position
positionOffset	uint16	The location of the current position

Ouput:

Field	Type	Description
amountIn	uint256	The Amount for the current swap.

getFirstAmountIn():

the getFirstAmountIn function is a utility function used to extract the first amount of an asset involved in a swap operation directly from the calldata of a transaction.

Input:

Field	Type	Description
swapArgsOffset	uint16	The location where the swapping data is stored.

Output:

Field	Type	Description
amountIn	uint256	The first amount in.

getData():

getData is a function that parses and organizes data from a transaction's calldata for a token swap operation.

Input:

Field	Type	Description
swapArgsOffset	uint16	The location where the swapping data is stored.

Output:

Field	Type	Description
swapData	SwapData memory	struct SwapData { uint16 amountsOffset; uint16 dataOffset; uint16 commandsOffset; uint16 commandsOffsetEnd; uint256 amountIn; address toAddress; address fromAssetAddress; address toAssetAddress; uint256 deadline; uint256 amountOutMin; }