我现在看到有个zlib，但是不懂应该怎么调用接口才能把文件解压出来
目的的为了把更新包patch.zip中的全部文件解压放到writablePath/update里面去
求大师答疑！
已经解决，贴在下面了，如果是普通的解压一段数据，用zlib轻松搞定，
解压文件到指定目录，就用我下面的代码。
我现在看到有个zlib，但是不懂应该怎么调用接口才能把文件解压出来
zlib.deflate
zlib.inflate
有导出这两个函数，但是参数和返回值没明白怎么弄
没人帮忙，只能自己搞定了
方法是导出ZipUtils，在ZipUtils里面添加uncompressDir的方法给lua用
bool ZipUtils::uncompressDir(char* filename, char* destPath)
{
if (filename == NULL || destPath == NULL)
{
CCLOG("source zip is null or dest path is null!");
return false;
}
// Open the zip file
std::string outFileName = filename;
unzFile zipfile = unzOpen(outFileName.c_str());
if (!zipfile)
{
CCLOG("can not open downloaded zip file %s", outFileName.c_str());
return false;
}
// Get info about the zip file
unz_global_info global_info;
if (unzGetGlobalInfo(zipfile, &global_info) != UNZ_OK)
{
CCLOG("can not read file global info of %s", outFileName.c_str());
unzClose(zipfile);
return false;
}
const int BUFFER_SIZE = 8192;
const int MAX_FILENAME = 512;
// Buffer to hold data read from the zip file
char readBuffer;
CCLOG("start uncompressing");
// Loop to extract all files.
uLong i;
for (i = 0; i < global_info.number_entry; ++i)
{
// Get info about current file.
unz_file_info fileInfo;
char fileName;
if (unzGetCurrentFileInfo(zipfile,
&fileInfo,
fileName,
MAX_FILENAME,
NULL,
0,
NULL,
0) != UNZ_OK)
{
CCLOG("can not read file info");
unzClose(zipfile);
return false;
}
std::string storagePath = destPath;
std::string fullPath = storagePath + fileName;
// Check if this entry is a directory or a file.
const size_t filenameLength = strlen(fileName);
if (fileName == '/')
{
// get all dir
std::string fileNameStr = std::string(fileName);
size_t position = 0;
while ((position = fileNameStr.find_first_of("/", position)) != std::string::npos)
{
std::string dirPath = storagePath + fileNameStr.substr(0, position);
// Entry is a direcotry, so create it.
// If the directory exists, it will failed scilently.
if (!createDirectory(dirPath.c_str()))
{
CCLOG("can not create directory %s", dirPath.c_str());
//unzClose(zipfile);
//return false;
}
position++;
}
}
else
{
// Entry is a file, so extract it.
// Open current file.
if (unzOpenCurrentFile(zipfile) != UNZ_OK)
{
CCLOG("can not open file %s", fileName);
unzClose(zipfile);
return false;
}
// Create a file to store current file.
FILE *out = fopen(fullPath.c_str(), "wb");
if (!out)
{
CCLOG("can not open destination file %s", fullPath.c_str());
unzCloseCurrentFile(zipfile);
unzClose(zipfile);
return false;
}
// Write current file content to destinate file.
int error = UNZ_OK;
do
{
error = unzReadCurrentFile(zipfile, readBuffer, BUFFER_SIZE);
if (error < 0)
{
CCLOG("can not read zip file %s, error code is %d", fileName, error);
unzCloseCurrentFile(zipfile);
unzClose(zipfile);
return false;
}
if (error > 0)
{
fwrite(readBuffer, error, 1, out);
}
} while (error > 0);
fclose(out);
}
unzCloseCurrentFile(zipfile);
// Goto next entry listed in the zip file.
if ((i + 1) < global_info.number_entry)
{
if (unzGoToNextFile(zipfile) != UNZ_OK)
{
CCLOG("can not read next file");
unzClose(zipfile);
return false;
}
}
}
unzClose(zipfile);
CCLOG("end uncompressing");
return true;
}
```
楼主强大。。。。。。。。。。。。。。。。。。。。。。。
zlib我也看了下，不得门入，于是从楼主了。
zlib 是不直接可以用吗
local lz = require(“zlib”)
local deflated, eof = lz.deflate()(text)
local inflated = lz.inflate()(deflated)
— Begin quote from ____
引用第6楼yangtao19cs于2014-07-09 16:54发表的 :
zlib 是不直接可以用吗
local lz= require(“zlib”)
local deflated, eof = lz.deflate()(text)
local inflated = lz.inflate()(deflated) http://www.cocoachina.com/bbs/job.php?action=topost&tid=212537&pid=999489
— End quote
zlib这样是解压一段缓存，解压出来的东西还是缓存。
而我要解压一堆文件，释放到某个地方
请问你这类在lua中如何调用？虽然quicklib编译通过了，但是不知道如何调用这些类
local lz= require(“zlib”) 这不是调用嘛 上边有人已经回复了 不好使么？
local lz= require(“zlib”) 不能实际解压一个zip包么？
看来quick-x应该把这个方法内置了
感谢回复，zlib是可以用，但是还是找不到解压zip包的方法。我看到lua_extension/unzip中好像提供了这个类，但是实际中还是找不到例子来使用。好烦的就是quic cocos文档好少。或者是我孤陋寡闻，不知道有没有文章引荐一下？关于unzip的调用例子。
确实我在帖子里面没有写那么细致
我这里只是写了实现，但是将这个函数导出到lua的过程是没有写的
这个你可以查一下如何导出C++函数到lua
就是编辑pkg，然后导出
最后你就可以ZipUtils:uncompressDir(youZipFile)来解压了
楼主的解压还是齐全
没有自动创建目录
明白，谢谢。 
local txt=“aaabbbc”
local zip=require(“zlib”)
local compress=zip.deflate()
local deflated, eof, bytes_in,bytes_out =compress(txt)
输出这四个值
x?
false
7
2
求大神解释这第二个参数总是false，很无奈！！
求指导下 你第二个参数返回false是什么问题 我也一样
local deflated, eof, bytes_in, bytes_out = Zlib.deflate()(“hahahahasssss”)
print(deflated)
print(eof)
print(bytes_in)
print(bytes_out)
local inflate, eof2, bytes_in2, bytes_out2 = Zlib.inflate()(deflated)
print(inflate)
print(eof2)
print(bytes_in2)
print(bytes_out2)
输出结果：
x?
false
13
2
false
2
0
求指导啊
修改cocox源文件总归不好，后来人不好维护，单独拿出来补充了一点，可以解压xxtea加密的zip，参考了LuaLoadChunksFromZIP函数，看了代码才发现竟然秘钥是protect的。。。。。。所以我这里暂时把秘钥写死在这里了，刚出炉，还有待完善。
#include "Zip.h"
#include <string>
#include "cocos2d.h"
#include "../platform/CCPlatformDefine.h"
#include "unzip/unzip.h"
#include "external/xxtea/xxtea.h"
namespace MyUtils {
USING_NS_CC;
bool Zip::uncompressZip(const char *zipFile, const char *dstPath)
{
const char xxteaKey] = {"xxxxxxx"};
const char xxteaSign] = {"xxxxxx"};
auto xxteaKeyLen = strlen(xxteaKey);
auto xxteaSignLen = strlen(xxteaSign);
if (zipFile == NULL || dstPath == NULL)
{
CCLOG("source zip is null or dest path is null!");
return false;
}
auto fileUtils = FileUtils::getInstance();
std::string srcFileName = fileUtils->fullPathForFilename(zipFile);
if (!fileUtils->isFileExist(srcFileName)) {
CCLOG("source zip file not exist %s",srcFileName.c_str());
return false;
}
ssize_t size = 0;
unsigned char *zipFileData = fileUtils->getFileData(srcFileName, "rb", &size);
if (zipFileData == nullptr) {
return false;
}
bool isXXTEA = true;
for (int i = 0; i < xxteaKeyLen && i < size; ++i) {
isXXTEA = zipFileData* == xxteaSign*;
}
unzFile zipfile = nullptr;
void *buffer = nullptr;
if (isXXTEA) { // decrypt XXTEA
xxtea_long len = 0;
buffer = xxtea_decrypt(zipFileData + xxteaSignLen,
(xxtea_long)size - (xxtea_long)xxteaSignLen,
(unsigned char*)xxteaKey,
(xxtea_long)xxteaKeyLen,
&len);
free(zipFileData);
zipFileData = nullptr;
zipfile = unzOpenBuffer(buffer, len);
} else {
if (zipFileData) {
zipfile = unzOpenBuffer(buffer, size);
}
}
// Open the zip file
if (!zipfile)
{
CCLOG("can not open downloaded zip file %s", srcFileName.c_str());
return false;
}
// Get info about the zip file
unz_global_info global_info;
if (unzGetGlobalInfo(zipfile, &global_info) != UNZ_OK)
{
CCLOG("can not read file global info of %s", srcFileName.c_str());
unzClose(zipfile);
return false;
}
const int BUFFER_SIZE = 8192;
const int MAX_FILENAME = 512;
// Buffer to hold data read from the zip file
char readBuffer;
CCLOG("start uncompressing");
// Loop to extract all files.
uLong i;
for (i = 0; i < global_info.number_entry; ++i)
{
// Get info about current file.
unz_file_info fileInfo;
char fileName;
if (unzGetCurrentFileInfo(zipfile,
&fileInfo,
fileName,
MAX_FILENAME,
NULL,
0,
NULL,
0) != UNZ_OK)
{
CCLOG("can not read file info");
unzClose(zipfile);
return false;
}
std::string storagePath = dstPath;
std::string fullPath = storagePath + fileName;
// Check if this entry is a directory or a file.
const size_t filenameLength = strlen(fileName);
if (fileName == '/')
{
// get all dir
std::string fileNameStr = std::string(fileName);
size_t position = 0;
while ((position = fileNameStr.find_first_of("/", position)) != std::string::npos)
{
std::string dirPath = storagePath + fileNameStr.substr(0, position);
// Entry is a direcotry, so create it.
// If the directory exists, it will failed scilently.
if (!FileUtils::getInstance()->createDirectory(dirPath.c_str()))
{
CCLOG("can not create directory %s", dirPath.c_str());
//unzClose(zipfile);
//return false;
}
position++;
}
}
else
{
// Entry is a file, so extract it.
// Open current file.
if (unzOpenCurrentFile(zipfile) != UNZ_OK)
{
CCLOG("can not open file %s", fileName);
unzClose(zipfile);
return false;
}
// Create a file to store current file.
FILE *out = fopen(fullPath.c_str(), "wb");
if (!out)
{
CCLOG("can not open destination file %s", fullPath.c_str());
unzCloseCurrentFile(zipfile);
unzClose(zipfile);
return false;
}
// Write current file content to destinate file.
int error = UNZ_OK;
do
{
error = unzReadCurrentFile(zipfile, readBuffer, BUFFER_SIZE);
if (error < 0)
{
CCLOG("can not read zip file %s, error code is %d", fileName, error);
unzCloseCurrentFile(zipfile);
unzClose(zipfile);
return false;
}
if (error > 0)
{
fwrite(readBuffer, error, 1, out);
}
} while (error > 0);
fclose(out);
}
unzCloseCurrentFile(zipfile);
// Goto next entry listed in the zip file.
if ((i + 1) < global_info.number_entry)
{
if (unzGoToNextFile(zipfile) != UNZ_OK)
{
CCLOG("can not read next file");
unzClose(zipfile);
return false;
}
}
}
unzClose(zipfile);
CCLOG("end uncompressing");
return true;
}
}**