zlib 压缩流模块

NodeJs

引入zlib压缩流模块： var zlib = require("zlib");

zlib 参数

createGzip()                            - 创建压缩流
deflate()                               -
deflateSync()                           -
gzip()                                  -
gzipSync()                              -
deflateRaw()                            -
deflateRawSync()                        -
unzip()                                 -
unzipSync()                             -
inflate()                               -
inflateSync()                           -
gunzip()                                -
gunzipSync()                            -
inflateRaw()                            -
inflateRawSync()                        -
createDeflate()                         -
createInflate()                         -
createDeflateRaw()                      -
createInflateRaw()                      -
createGunzip()                          -
createUnzip()                           -
Deflate {}                              -
Inflate {}                              -
Gzip {}                                 -
Gunzip {}                               -
DeflateRaw {}                           -
InflateRaw {}                           -
Unzip {}                                -
constants {}                            - 
codes {}                                - 
Z_NO_FLUSH: 0,
Z_PARTIAL_FLUSH: 1,
Z_SYNC_FLUSH: 2,
Z_FULL_FLUSH: 3,
Z_FINISH: 4,
Z_BLOCK: 5,
Z_OK: 0,
Z_STREAM_END: 1,
Z_NEED_DICT: 2,
Z_ERRNO: -1,
Z_STREAM_ERROR: -2,
Z_DATA_ERROR: -3,
Z_MEM_ERROR: -4,
Z_BUF_ERROR: -5,
Z_VERSION_ERROR: -6,
Z_NO_COMPRESSION: 0,
Z_BEST_SPEED: 1,
Z_BEST_COMPRESSION: 9,
Z_DEFAULT_COMPRESSION: -1,
Z_FILTERED: 1,
Z_HUFFMAN_ONLY: 2,
Z_RLE: 3,
Z_FIXED: 4,
Z_DEFAULT_STRATEGY: 0,
ZLIB_VERNUM: 4784,
DEFLATE: 1,
INFLATE: 2,
GZIP: 3,
GUNZIP: 4,
DEFLATERAW: 5,
INFLATERAW: 6,
UNZIP: 7,
Z_MIN_WINDOWBITS: 8,
Z_MAX_WINDOWBITS: 15,
Z_DEFAULT_WINDOWBITS: 15,
Z_MIN_CHUNK: 64,
Z_MAX_CHUNK: Infinity,
Z_DEFAULT_CHUNK: 16384,
Z_MIN_MEMLEVEL: 1,
Z_MAX_MEMLEVEL: 9,
Z_DEFAULT_MEMLEVEL: 8,
Z_MIN_LEVEL: -1,
Z_MAX_LEVEL: 9,
Z_DEFAULT_LEVEL: -1 

createGzip() 创建压缩流

例子：

var fs = require("fs");
var zlib = require("zlib");     // 引入可压缩模块
var readStream = fs.createReadStream("./guilai.mp4");     // 创建可读流
var writeStream = fs.createWriteStream("./www.mp4.zip");   // 创建可写流
var gzip = zlib.createGzip();   //创建压缩流
readStream.pipe(gzip).pipe(writeStream);    // 通过中间管道进行压缩然后写入到可写流中

作者 wendy
2019 年 1月 21日