_packAndStoreIntrinsicPropertiesOf

Contract: JBFundingCycleStore​

Step by step

Efficiently stores a funding cycle's provided intrinsic properties.

Definition

function _packAndStoreIntrinsicPropertiesOf(
  uint256 _configuration,
  uint256 _projectId,
  uint256 _number,
  uint256 _weight,
  uint256 _basedOn,
  uint256 _start
) private { ... }

• Arguments:
  • _configuration is the configuration of the funding cycle to pack and store.
  • _projectId is the ID of the project to which the funding cycle belongs.
  • _number is the number of the funding cycle.
  • _weight is the weight of the funding cycle.
  • _basedOn is the configuration of the base funding cycle.
  • _start is the start time of this funding cycle.
• The function is private to this contract.
• The function doesn't return anything.

Body

1. The weight property should take up the first 80 bits of the packed uint256.

   // weight in bits 0-87.
   uint256 packed = _weight;

2. The based on configuration should take up the next 56 bits.

   // basedOn in bits 88-143.
   packed |= _basedOn << 88;

3. The start should take up the next 56 bits.

   // start in bits 144-199.
   packed |= _start << 144;

4. The number should take up the last 56 bits.

   // number in bits 200-255.
   packed |= _number << 200;

5. Store the packed intrinsic properties for the funding cycle.

   // Store the packed value.
   _packedIntrinsicPropertiesOf[_projectId][_configuration] = packed;

   Internal references:

   • _packedIntrinsicPropertiesOf

Code

/**
  @notice
  Efficiently stores a funding cycle's provided intrinsic properties.

  @param _configuration The configuration of the funding cycle to pack and store.
  @param _projectId The ID of the project to which the funding cycle belongs.
  @param _number The number of the funding cycle.
  @param _weight The weight of the funding cycle.
  @param _basedOn The configuration of the base funding cycle.
  @param _start The start time of this funding cycle.
*/
function _packAndStoreIntrinsicPropertiesOf(
  uint256 _configuration,
  uint256 _projectId,
  uint256 _number,
  uint256 _weight,
  uint256 _basedOn,
  uint256 _start
) private {
  // weight in bits 0-87.
  uint256 packed = _weight;

  // basedOn in bits 88-143.
  packed |= _basedOn << 88;

  // start in bits 144-199.
  packed |= _start << 144;

  // number in bits 200-255.
  packed |= _number << 200;

  // Store the packed value.
  _packedIntrinsicPropertiesOf[_projectId][_configuration] = packed;
}

Bug bounty

Category	Description	Reward
Optimization	Help make this operation more efficient.	0.5ETH
Low severity	Identify a vulnerability in this operation that could lead to an inconvenience for a user of the protocol or for a protocol developer.	1ETH
High severity	Identify a vulnerability in this operation that could lead to data corruption or loss of funds.	5+ETH