Unable to decode bytes with error data out-of-bounds

[VincentHoong]

Ethers Version

6.1.0

Search Terms

out-of-bounds, decode, bytes

Describe the Problem

I am trying to decode a log from this transaction https://etherscan.io/tx/0x0bc594ca26e416407d37055e3b171d5ed60925477e78f644b033a251e5a84731#eventlog, on the log index 68.

However, when I tried to decode it throws me an error as shown:
data out-of-bounds (buffer=0x000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, length=96, offset=160, code=BUFFER_OVERRUN, version=6.1.0)

Not sure what I am missing

Code Snippet

const parameters = ['address','address','uint256','bytes','bytes'];
const data = '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';
const defaultAbiCoder = new ethers.AbiCoder();

const values = defaultAbiCoder.decode(parameters, data);

console.log(values);

Contract ABI

No response

Errors

data out-of-bounds (buffer=0x000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, length=96, offset=160, code=BUFFER_OVERRUN, version=6.1.0) 
  ​​​​​at ​​​​​​​​makeError​​​ /project/node_modules/.pnpm/ethers@6.1.0/node_modules/ethers/src.ts/utils/errors.ts:660​
  ​​​​​at ​​​​​​​​assert​​​ /project/node_modules/.pnpm/ethers@6.1.0/node_modules/ethers/src.ts/utils/errors.ts:680​
  ​​​​​at ​​​​​​​​Reader.#peekBytes​​​ /project/node_modules/.pnpm/ethers@6.1.0/node_modules/ethers/src.ts/abi/coders/abstract-coder.ts:419​
  ​​​​​at ​​​​​​​​Reader.readBytes​​​ /project/node_modules/.pnpm/ethers@6.1.0/node_modules/ethers/src.ts/abi/coders/abstract-coder.ts:436​
  ​​​​​at ​​​​​​​​BytesCoder.decode​​​ /project/node_modules/.pnpm/ethers@6.1.0/node_modules/ethers/src.ts/abi/coders/bytes.ts:28​
  ​​​​​at ​​​​​​​​BytesCoder.decode​​​ /project/node_modules/.pnpm/ethers@6.1.0/node_modules/ethers/src.ts/abi/coders/bytes.ts:41​
  ​​​​​at ​​​​​/project/node_modules/.pnpm/ethers@6.1.0/node_modules/ethers/src.ts/abi/coders/array.ts:93​
  ​​​​​at ​​​​​​​​unpack​​​ /project/node_modules/.pnpm/ethers@6.1.0/node_modules/ethers/src.ts/abi/coders/array.ts:86​
  ​​​​​at ​​​​​​​​TupleCoder.decode​​​ /project/node_modules/.pnpm/ethers@6.1.0/node_modules/ethers/src.ts/abi/coders/tuple.ts:66​
  ​​​​​at ​​​​​​​​AbiCoder.decode​​​ /project/node_modules/.pnpm/ethers@6.1.0/node_modules/ethers/src.ts/abi/abi-coder.ts:208

Environment

node.js (v12 or newer)

Environment (Other)

No response

[ricmoo]

In a Log, the data only encoded the non-indexed parameters, so if you are going to manually decode the data, you have to remove the indexed parameters from your list of types.

If you use the Interface directly, this is taken care of for you. :)

[VincentHoong]

Interesting, thanks for the explanation.

Initially thought it would've work even if I concatenate all topics and data and decode it as one single hex

Made it worked with this:

const parameters = ['uint256','bytes','bytes'];
const data = '0x000000000000000000000000000000000000000000000000840e6997d866bceb0000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000';
const defaultAbiCoder = new ethers.AbiCoder();

const values = defaultAbiCoder.decode(parameters, data);

console.log(values);

[ricmoo]

ABI coding is definitely more complex that just concatenation. Lots of internal pointers that would need to have the offsetting updated in new elements were prepended and such. :)

Glad you got it working. :)