podman

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//go:build windows
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// +build windows
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// build
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/*
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 * Copyright 2021 ByteDance Inc.
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *     http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package loader
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import (
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    `syscall`
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    `unsafe`
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)
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const (
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    MEM_COMMIT  = 0x00001000
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    MEM_RESERVE = 0x00002000
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)
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var (
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    libKernel32                = syscall.NewLazyDLL("KERNEL32.DLL")
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    libKernel32_VirtualAlloc   = libKernel32.NewProc("VirtualAlloc")
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    libKernel32_VirtualProtect = libKernel32.NewProc("VirtualProtect")
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)
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func mmap(nb int) uintptr {
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    addr, err := winapi_VirtualAlloc(0, nb, MEM_COMMIT|MEM_RESERVE, syscall.PAGE_READWRITE)
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    if err != nil {
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        panic(err)
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    }
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    return addr
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}
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func mprotect(p uintptr, nb int) (oldProtect int) {
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    err := winapi_VirtualProtect(p, nb, syscall.PAGE_EXECUTE_READ, &oldProtect)
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    if err != nil {
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        panic(err)
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    }
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    return
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}
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// winapi_VirtualAlloc allocate memory
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// Doc: https://docs.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualalloc
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func winapi_VirtualAlloc(lpAddr uintptr, dwSize int, flAllocationType int, flProtect int) (uintptr, error) {
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    r1, _, err := libKernel32_VirtualAlloc.Call(
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        lpAddr,
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        uintptr(dwSize),
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        uintptr(flAllocationType),
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        uintptr(flProtect),
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    )
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    if r1 == 0 {
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        return 0, err
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    }
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    return r1, nil
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}
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// winapi_VirtualProtect change memory protection
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// Doc: https://docs.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualprotect
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func winapi_VirtualProtect(lpAddr uintptr, dwSize int, flNewProtect int, lpflOldProtect *int) error {
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    r1, _, err := libKernel32_VirtualProtect.Call(
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        lpAddr,
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        uintptr(dwSize),
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        uintptr(flNewProtect),
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        uintptr(unsafe.Pointer(lpflOldProtect)),
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    )
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    if r1 == 0 {
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        return err
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    }
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    return nil
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}
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