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API > API/Runtime > API/Runtime/Core > API/Runtime/Core/IO
References
| Module | Core |
| Header | /Engine/Source/Runtime/Core/Public/IO/IoHash.h |
| Include | #include "IO/IoHash.h" |
Syntax
struct FIoHash
Remarks
Stores a BLAKE3-160 hash, taken from the first 20 bytes of a BLAKE3-256 hash.
The BLAKE3 hash function was selected for its high performance and its ability to parallelize. Only the leading 160 bits of the 256-bit hash are used, to provide strong collision resistance while minimizing the size of the hash.
When the data to hash is not in a contiguous region of memory, use FIoHashBuilder to hash data in blocks with FIoHashBuilder::Update(Block) followed by FIoHashBuilder::Finalize().
Constructors
| Type | Name | Description | |
|---|---|---|---|
 |
FIoHash () |
Construct a zero hash. | |
 |
Construct a hash from an array of 20 bytes. | ||
 |
FIoHash
(
const FBlake3Hash& Hash |
Construct a hash from a BLAKE3-256 hash. | |
 |
FIoHash
(
FAnsiStringView HexHash |
Construct a hash from a 40-character hex string. | |
 |
FIoHash
(
FWideStringView HexHash |
Construct a zero hash. | |
 |
FIoHash
(
FUtf8StringView HexHash |
Construct a zero hash. |
Functions
| Type | Name | Description | |
|---|---|---|---|
  |
FIoHash | FromView
(
FMemoryView Hash |
Construct a hash from a view of 20 bytes. |
 |
ByteArray & | GetBytes () |
Returns a reference to the raw byte array for the hash. |
  |
const ByteArray & | GetBytes () |
|
  |
FIoHash | HashBuffer
(
FMemoryView View |
Calculate the hash of the buffer. |
  |
FIoHash | HashBuffer
(
const FCompositeBuffer& Buffer |
Calculate the hash of the buffer. |
  |
FIoHash | HashBuffer
(
const void* Data, |
Calculate the hash of the buffer. |
  |
bool | IsZero () |
Returns whether this is a zero hash. |
 |
void | Reset () |
Reset this to a zero hash. |
Typedefs
| Name | Description |
|---|---|
| ByteArray |
Constants
| Name | Description |
|---|---|
| Zero | A zero hash. |