zlib | 易学教程

How can I easily compress and decompress files using zlib? [closed]

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问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 years ago . How can I easily compress and decompress files using zlib? 回答1: For decompression: char buf[1024*1024*16]; gzFile *fi = (gzFile *)gzopen("file.gz","rb"); gzrewind(fi); while(!gzeof(fi)) { int len = gzread(fi,buf,sizeof(buf)); //buf contains len bytes of decompressed data } gzclose

sqlite3.ProgrammingError: You must not use 8-bit bytestrings unless you use a text_factory that can interpret 8-bit bytestrings

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问题 Using SQLite3 in Python, I am trying to store a compressed version of a snippet of UTF-8 HTML code. Code looks like this: ... c = connection.cursor() c.execute('create table blah (cid integer primary key,html blob)') ... c.execute('insert or ignore into blah values (?, ?)',(cid, zlib.compress(html))) At which point at get the error: sqlite3.ProgrammingError: You must not use 8-bit bytestrings unless you use a text_factory that can interpret 8-bit bytestrings (like text_factory = str). It is

sqlite3.ProgrammingError: You must not use 8-bit bytestrings unless you use a text_factory that can interpret 8-bit bytestrings

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openssh-升级

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系统： centos7 openssh升级版本 openssh8.0 p1 准备工作关闭防火墙 systemctl stop firewalld systemctl disable firewalld 关闭selinux setenforce 0 sed -i 's/^SELINUX.*$/SELINUX=disabled/g' /etc/selinux/config 安装telnet服务端 yum -y install telnet telnet-server xinetd 配置telnet-server（使其可远程登录） #允许root用户通过telnet登陆： vi /etc/pam.d/login #编辑/etc/pam.d/login，注释掉下面这行 #auth [user_unknown=ignore success=ok ignore=ignore default=bad] pam_securetty.so #添加超级用户登陆设备： cp /etc/securetty /etc/securetty.bak #备份/etc/securetty文件 #添加超级用户登陆设备至/etc/securetty文件 echo "pts/1" >> /etc/securetty echo "pts/2" >> /etc/securetty echo "pts/3" >> /etc

zlib inflate CHUNK size has to be the same as the size used in deflation?

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问题 I followed the zlib inflate example from http://zlib.net/zlib_how.html to decompress a zipped file. Even after I defined the CHUNK size as 256KB, I see the output data of each inflate() function call is only 8KB. I knew the zipped file was deflated by using a CHUNK size of 8K, so does this mean zlib inflate's CHUNK size has to be the same as the size used in deflation? If yes, without changing the source file, is there anyway to speed up decompression? Using a CHUNK size of 8K to decompress

HPDF_SetCompressionMode() not working in Libharu

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问题 I am generating Pdf files using LibHaru libraries. My code is following #include <iostream> #include "hpdf.h" using namespace std; void error_handler(HPDF_STATUS error_no, HPDF_STATUS detail_no, void *user_data) { } int main() { cout<<"Compression"<<endl; HPDF_Doc pdf = HPDF_New(error_handler, NULL); if (!pdf) return 0; HPDF_STATUS Status = HPDF_SetCompressionMode(pdf, HPDF_COMP_ALL); return 0; } PROBLEM: I debugged the code and found that HPDF_SetCompressionMode() returns 4129 , which is the

gzip partial modification and re-compression

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问题 I am unfamiliar with compression algorithms. Is it possible with zlib or some other library to decompress, modify and recompress only the beginning of a gzip stream and then concatenate it with the compressed remainder of the stream? This would be done in a case where, for example, I need to modify the first bytes of user data (not headers) of a 10GB gzip file so as to avoid decompressing and recompressing the entire file. 回答1: No. Compression will generally make use of the preceding data in

zlib编译

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1.下载zlib库 http://zlib.net/ http://zlib.net/zlib-1.2.11.tar.gz 2. 将下载后的文件解压到如下目录 E:\osg\zlib\zlib-1.2.11 3. 用VS2019打开 E:\osg\zlib\zlib-1.2.11\contrib\vstudio\vc14\zlibvc.sln 文件 4.修改编译类型 5.修改“生成前事件”的命令行将其内容改为： E: cd E:\osg\zlib\zlib-1.2.11\contrib\masmx64 bld_ml64.bat 6.编译来源： https://www.cnblogs.com/gispathfinder/p/12151725.html

How to change deflate stream output format(raw, zlib, gzip) when use zlib?

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问题 Zlib can output three format, I try to search the docs and zlib.h , but can't find a clear explanation about the options, anyone have any ideas? 回答1: From the zlib.h documentation of deflateInit2() : windowBits can also be -8..-15 for raw deflate. In this case, -windowBits determines the window size. deflate() will then generate raw deflate data with no zlib header or trailer, and will not compute a check value. windowBits can also be greater than 15 for optional gzip encoding. Add 16 to

How to change deflate stream output format(raw, zlib, gzip) when use zlib?

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