How should I practice Copy File Bytes with Partial Writes?

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Copy File Bytes with Partial Writes

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Problem statement

Simulate the core data loop of a file-copy command. source contains the source file's bytes as integers from 0 through 255.

Read at most readChunkSize bytes at a time. A single write accepts at most maxWriteSize bytes, so keep writing until the entire current read buffer is stored. Return the destination bytes after the copy completes.

Function

copyFileBytes(source: int[], readChunkSize: int, maxWriteSize: int) → int[]

Examples

Example 1

source = [0,255,1,2,3]readChunkSize = 3maxWriteSize = 2return = [0,255,1,2,3]

The first three-byte read requires two writes, but no byte is lost.

Example 2

source = []readChunkSize = 4maxWriteSize = 1return = []

An empty source creates an empty destination.

Constraints

0 <= source.length <= 100000.
1 <= readChunkSize, maxWriteSize <= 100000.
Every source value is between 0 and 255.