funcReadData¶

func ReadData(rio.Reader, nuint64) ([]byte,error)

ReadData reads n bytes from the input stream, but avoids allocatingall n bytes if n is large. This avoids crashing the program byallocating all n bytes in cases where n is incorrect.

The error is io.EOF only if no bytes were read.If an io.EOF happens after reading some but not all the bytes,ReadData returns io.ErrUnexpectedEOF.

funcReadDataAt¶

func ReadDataAt(rio.ReaderAt, nuint64, offint64) ([]byte,error)

ReadDataAt reads n bytes from the input stream at off, but avoidsallocating all n bytes if n is large. This avoids crashing the programby allocating all n bytes in cases where n is incorrect.

funcSliceCap¶

func SliceCap[Eany](cuint64)int

SliceCap is like SliceCapWithSize but using generics.

funcSliceCapWithSize¶added ingo1.22.0

func SliceCapWithSize(size, cuint64)int

SliceCapWithSize returns the capacity to use when allocating a slice.After the slice is allocated with the capacity, it should bebuilt using append. This will avoid allocating too much memoryif the capacity is large and incorrect.

A negative result means that the value is always too big.