mutating func initialize()

in Sources/NIOHTTPCompression/HTTPCompression.swift [56:74]

• 16 lines of code
• 3 McCabe index (conditional complexity)

        mutating func initialize(encoding: Algorithm) {
            assert(!isActive)
            isActive = true
            // zlib docs say: The application must initialize zalloc, zfree and opaque before calling the init function.
            stream.zalloc = nil
            stream.zfree = nil
            stream.opaque = nil

            let windowBits: Int32
            switch encoding.algorithm {
            case .deflate:
                windowBits = 15
            case .gzip:
                windowBits = 16 + 15
            }

            let rc = CNIOExtrasZlib_deflateInit2(&stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED, windowBits, 8, Z_DEFAULT_STRATEGY)
            precondition(rc == Z_OK, "Unexpected return from zlib init: \(rc)")
        }