zlib | 易学教程

How to use multiple threads for zlib compression (same input source)

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问题 My goal is to compress the data of the same source in parallel threads. I have defined jobs which are in a list, these jobs have the read information(500kb-1MB in each job). My compressor threads will compress each block's data using ZLIB and store it in the outbuf of the corresponding jobs. Now, I want to ,merge all this and create one output file which is of standard ZLIB format. From the ZLIB RFC and after browsing the source of pigzee, I understand that A ZLIB header is like below +---+--

java.io.EOFException: Unexpected end of ZLIB input stream reading a file

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问题 I wrote the following code to read Freebase data dumps and I got error java.io.EOFException: Unexpected end of ZLIB input stream and I do not know how should I solve this problem. Could you please tell me where is the problem. GZIPInputStream in = new GZIPInputStream(new FileInputStream(path.freebaseTriples)); String line; Reader decoder = new InputStreamReader(in); BufferedReader br = new BufferedReader(decoder); ParseFreebaseRDF rdfs= new ParseFreebaseRDF(); while ((line = br.readLine()) !=

Centos7 从源码安装/升级GCC(超详细)

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Centos7.6 默认安装的gcc版本为4.8.5，可通过命令 gcc -v 查看，如果需要使用gcc的最新特性，则需要源码安装gcc最新版。 gcc -v 输出的信息，包括生成 makefile 时候的 configure ，在步骤5可以参考该配置。使用内建 specs。 COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper 目标：x86_64-redhat-linux 配置为：../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with

Using zlib under windows mingw

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问题 I can't seem to get zlib to do anything on mingw under windows. I downloaded zlib @ http://sourceforge.net/projects/mingw/files_beta/MinGW/zlib/zlib-1.2.3-1-mingw32/ and put the header and lib files in the right place. Simple code like: #include <stdlib.h> #include <stdio.h> #include "zlib.h" int main(int argc, char *argv[]) { long a; char buffer[1024]; a = 1024; compress(buffer,&a,"testing",7); return 0; } compiled: gcc test.c -lzlib -Wall -o test.exe Compiles fine. However the exe crashes

RedHat7.2自带curl请求https站点报错解决方案

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问题背景我们的项目要拿到客户机上做私有化安装，服务器操作系统客户指定只能使用redhat7.2版本，且客户机为了保密需要不能访问外网，而操蛋的redhat系统自带的curl支持的是nss协议的https，而非openssl协议的https，执行curl访问https站点的时候会出现无法load key的报错。网上查了一下解决方案，Stack Overflow上有答案说是生成的key的问题，需要将key转换成RSA的加密方式，我试了一下，curl命令不会报错，但我们的服务端代码实现不能正常的初始化相关加解密容器。还有部分答案推荐重装curl，由于对redhat系统并不熟悉，且向来听说 linux 上离线安装的时候需要处理的依赖比较复杂，我的内心其实是拒绝的，但没有更好的解决办法，只能硬着头皮上了。。。安装zlib 访问zlib官网，下载最新的zlib包，这里由于我的rhel是较新的7.2版本，因此直接使用了zlib的最新版，如果是老版本，可能需要考虑linux内核的兼容性问题；解压缩zlib安装包，cd到解压缩的zlib包目录下，运行以下命令: ./configure make test make install #这里安装的是静态库 make clean ./configure --shared make test make install #这里先clean

skui学习笔记

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一、skui简介使用Skia作为低级绘图工具包的UI框架。它使用C ++标准库的最新功能（当前针对C ++ 17）。目前这个仓库处于开发阶段，功能还不稳定。该仓库的源代码在github上（ https://github.com/skui-org/skui ），作者是Ruben Van Boxem，遵循MIT开源协议。这里不得不先介绍一下skia。Skia是一个开源2D图形库，它提供可在各种硬件和软件平台上工作的通用API。它用作Google Chrome和Chrome OS，Android，Mozilla Firefox和Firefox OS以及许多其他产品的图形引擎。Skia由Google赞助和管理，根据BSD自由软件许可，任何人均可使用。skia的优势在于CPU和2D渲染。二、编译环境搭建我的编译环境：Ubuntu18.04LTS，GCC版本7.4.0 首先从github上克隆仓库 git clone https://github.com/skui-org/skui.git 进入仓库 cd skui 更新子模块仓库 git submodule update --init --recursive 有的时候会在拉取skia的时候卡住，这时候进入3rdparty目录再次拉取 cd 3rdparty git submodule update --init --recursive

Linux下Apache+PHP+MySql

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Linux 下 Apache+PHP+MySql 附加 zlib+freetype+libpng+jpeg+GD 安装安装顺序： Apache—MySql—zlib—freetype—libpng—jpeg—zend—GD—PHP 一 . Apache 安装在如下页面下载 apache 的 for Linux 的源码包 http://www.apache.org/dist/httpd/ tar –zxvf httpd-2.0.59.tar.gz cd httpd-2.0.59 ./configure --prefix=/php/apache2.0.59 --enable-module=so make make install 安装 apache 至 /php/apache2.0.59 并配置 apache 支持 dso 方式配置 httpd.conf vi /php/apache2.0.59/conf/httpd.conf DocumentRoot "/home/httpd/html/" 此处为 html 文件主目录同上 Options FollowSymLinks MultiViews 为安全起见，去掉 "Indexes" DirectoryIndex default.php default.phtml default.php3 default.html default

zlib build error with GHC

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问题 I'm using a VM with the following configuration: Arch Linux (3.0-ARCH kernel) GHC 7.0.3 cabal-install 0.10.2 Cabal library 1.10.1.0 When I try to build zlib using cabal... $ cabal install zlib I get the following output: Resolving dependencies... Downloading zlib-0.5.3.2... Configuring zlib-0.5.3.2... Preprocessing library zlib-0.5.3.2... Stream.hsc:86:21: error: missing binary operator before token "(" Stream.hsc: In function ‘main’: Stream.hsc:86:21: error: missing binary operator before

zlib from C++ to C#(How to convert byte[] to stream and stream to byte[])

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问题 My task is to decompress a packet(received) using zlib and then use an algoritm to make a picture from the data The good news is that I have the code in C++,but the task is to do it in C# C++ //Read the first values of the packet received DWORD image[200 * 64] = {0}; //used for algoritm(width always = 200 and height always == 64) int imgIndex = 0; //used for algoritm unsigned char rawbytes_[131072] = {0}; //read below unsigned char * rawbytes = rawbytes_; //destrination parameter for

zlib decompression in python

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问题 Okay so I have some data streams compressed by python's (2.6) zlib.compress() function. When I try to decompress them, some of them won't decompress (zlib error -5, which seems to be a "buffer error", no idea what to make of that). At first, I thought I was done, but I realized that all the ones I couldn't decompress started with 0x78DA (the working ones were 0x789C), and I looked around and it seems to be a different kind of zlib compression -- the magic number changes depending on the