BcsReader class
Class used for reading BCS data chunk by chunk. Meant to be used by some wrapper, which will make sure that data is valid and is matching the desired format.
// data for this example is:
// { a: u8, b: u32, c: bool, d: u64 }
final reader = BcsReader(fromHEX("647f1a060001ffffe7890423c78a050102030405"));
final field1 = reader.read8();
final field2 = reader.read32();
final field3 = reader.read8() == 1; // bool
final field4 = reader.read64();
// ....
Reading vectors is another deal in bcs. To read a vector, you first need to read its length using {@link readULEB}. Here's an example:
// data encoded: { field: [1, 2, 3, 4, 5] }
final reader = BcsReader(fromHEX("050102030405"));
final vec_length = reader.readULEB();
final elements = [];
for (var i = 0; i < vec_length; i++) {
elements.add(reader.read8());
}
print(elements); // [1,2,3,4,5]
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
read128(
) → BigInt - Read U128 value from the buffer and shift cursor by 16.
-
read16(
) → int - Read U16 value from the buffer and shift cursor by 2.
-
read256(
) → BigInt - Read U256 value from the buffer and shift cursor by 32.
-
read32(
) → int - Read U32 value from the buffer and shift cursor by 4.
-
read64(
) → BigInt - Read U64 value from the buffer and shift cursor by 8.
-
read8(
) → int - Read U8 value from the buffer and shift cursor by 1.
-
readBytes(
int num) → Uint8List -
Read
numnumber of bytes from the buffer and shift cursor bynum. -
readFixedArray(
int size, dynamic cb(BcsReader reader, int i, int length)) → List -
readULEB(
) → int - Read ULEB value - an integer of varying size. Used for enum indexes and vector lengths.
-
readVec(
dynamic cb(BcsReader reader, int i, int length)) → List -
Read a BCS vector: read a length and then apply function
cbX times where X is the length of the vector, defined as ULEB in BCS bytes. -
shift(
int bytes) → BcsReader -
Shift current cursor position by
bytes. -
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited