c++数据压缩

Compress.hpp

#pragma	once
#include 


typedef	NTSTATUS(WINAPI *pRtlGetCompressionWorkSpaceSize)(
	_In_  USHORT CompressionFormatAndEngine,
	_Out_ PULONG CompressBufferWorkSpaceSize,
	_Out_ PULONG CompressFragmentWorkSpaceSize
	);
typedef	NTSTATUS(WINAPI *pRtlCompressBuffer)(
	_In_  USHORT CompressionFormatAndEngine,
	_In_  PUCHAR UncompressedBuffer,
	_In_  ULONG  UncompressedBufferSize,
	_Out_ PUCHAR CompressedBuffer,
	_In_  ULONG  CompressedBufferSize,
	_In_  ULONG  UncompressedChunkSize,
	_Out_ PULONG FinalCompressedSize,
	_In_  PVOID  WorkSpace
	);

typedef	NTSTATUS(WINAPI *pRtlDecompressBuffer)(
	_In_  USHORT CompressionFormat,
	_Out_ PUCHAR UncompressedBuffer,
	_In_  ULONG  UncompressedBufferSize,
	_In_  PUCHAR CompressedBuffer,
	_In_  ULONG  CompressedBufferSize,
	_Out_ PULONG FinalUncompressedSize
	);

pRtlGetCompressionWorkSpaceSize	RtlGetCompressionWorkSpaceSize = NULL;
pRtlCompressBuffer				RtlCompressBuffer = NULL;
pRtlDecompressBuffer			RtlDecompressBuffer = NULL;
bool	InitAPI(){
	auto	hDll = LoadLibrary("ntdll.dll");
	if (!hDll){
		return FALSE;
	}
	RtlGetCompressionWorkSpaceSize = (pRtlGetCompressionWorkSpaceSize)GetProcAddress(hDll, "RtlGetCompressionWorkSpaceSize");
	if (!RtlGetCompressionWorkSpaceSize){
		return FALSE;
	}
	RtlCompressBuffer = (pRtlCompressBuffer)GetProcAddress(hDll, "RtlCompressBuffer");
	if (!RtlCompressBuffer){
		return FALSE;
	}
	RtlDecompressBuffer = (pRtlDecompressBuffer)GetProcAddress(hDll, "RtlDecompressBuffer");
	if (!RtlDecompressBuffer){
		return FALSE;
	}
	return TRUE;
}

bool	Compress(BYTE* data, DWORD size, BYTE* buffer, DWORD &bufsize){
	DWORD dwWorkSpaceSize = 0, dwFragmentWorkSpaceSize = 0;
	BYTE *pWorkSpace = NULL;
	BYTE *pCompressData = NULL;
	NTSTATUS	status = FALSE;
	DWORD dwCompressDataLength = 4096;
	DWORD dwFinalCompressSize = 0;
	status = RtlGetCompressionWorkSpaceSize(COMPRESSION_FORMAT_LZNT1 | COMPRESSION_ENGINE_STANDARD, &dwWorkSpaceSize, &dwFragmentWorkSpaceSize);
	if (status != 0){
		return FALSE;
	}
	pWorkSpace = new BYTE[dwWorkSpaceSize];
	if (NULL == pWorkSpace)
	{
		return FALSE;
	}
	::RtlZeroMemory(pWorkSpace, dwWorkSpaceSize);
	status = RtlCompressBuffer(COMPRESSION_FORMAT_LZNT1, data, size, buffer, bufsize, 4096, &dwFinalCompressSize, (PVOID)pWorkSpace);
	if (status != 0){
		return FALSE;
	}
	delete[] pWorkSpace;
	bufsize = dwFinalCompressSize;
	return TRUE;
}

bool	Decompress(BYTE* data, DWORD size, BYTE* buffer, DWORD &bufsize){
	DWORD dwWorkSpaceSize = 0, dwFragmentWorkSpaceSize = 0;
	BYTE *pWorkSpace = NULL;
	BYTE *pCompressData = NULL;
	NTSTATUS	status = FALSE;
	DWORD dwCompressDataLength = 4096;
	DWORD dwFinalCompressSize = 0;
	status = RtlGetCompressionWorkSpaceSize(COMPRESSION_FORMAT_LZNT1 | COMPRESSION_ENGINE_STANDARD, &dwWorkSpaceSize, &dwFragmentWorkSpaceSize);
	if (status != 0){
		return FALSE;
	}
	pWorkSpace = new BYTE[dwWorkSpaceSize];
	if (pWorkSpace == NULL){
		return FALSE;
	}
	RtlZeroMemory(pWorkSpace, dwWorkSpaceSize);
	status = RtlDecompressBuffer(COMPRESSION_FORMAT_LZNT1, buffer, bufsize, data, size, &dwFinalCompressSize);
	if (status != 0){
		return FALSE;
	}
	delete[] pWorkSpace;
	bufsize = dwFinalCompressSize;
	return TRUE;
}

使用方法

// Fork.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include "Compress.hpp"
#include 

using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{

	BYTE	data[] = "DDDDDDDDDDGGGGGGGGGGGG";
	auto	buffer = new BYTE[100];
	DWORD		size = 100;
	if (!InitAPI()){
		cout << "InitFailed" << endl;
		return -1;
	}
	if (Compress(data, 22, buffer, size)){
		for (int i = 0; i < size; i++){
			printf("%02X ", buffer[i]);
		}
		DWORD bufSize = 100;
		auto destBuf = new BYTE[bufSize];

		if (!destBuf){
			return -1;
		}
		if (Decompress(buffer, size, destBuf, bufSize)){
			for (int i = 0; i < bufSize; i++){
				printf("%c ", destBuf[i]);
			}
		}

	}
	else{
		cout << "Failed" << endl;
	}
	delete[] buffer;
	getchar();
	return 0;
}