You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: policy.go
    path of file: ./repos/Xray-core/features/policy
    
    the code of the file until where you have to start completion: package policy

import (
	"context"
	"runtime"
	"time"

	"github.com/xtls/xray-core/common/platform"
	"github.com/xtls/xray-core/featu
    
func init() {
	const defaultValue = -17
	size := platform.NewEnvFlag(platform.BufferSize).GetValueAsInt(defaultValue)

	switch size {
	case 0:
		defaultBufferSize = -1 // For pipe to use unlimited size
	case defaultValue: // Env flag not defined. Use default values per CPU-arch.
		switch runtime.GOARCH {
		case "arm", "mips", "mipsle":
			defaultBufferSize = 0
		case "arm64", "mips64", "mips64le":
			defaultBufferSize = 4 * 1024 // 4k cache for low-end devices
		default:
			defaultBufferSize = 512 * 1024
		}
	default:
		defaultBufferSize = int32(size) * 1024 * 1024
	}
}