{"id":3488,"date":"2017-08-05T13:40:46","date_gmt":"2017-08-05T05:40:46","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=3488"},"modified":"2017-08-05T13:40:46","modified_gmt":"2017-08-05T05:40:46","slug":"linux%e4%b8%8bc%e8%af%ad%e8%a8%80%e7%9a%84zlib%e5%8e%8b%e7%bc%a9","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/3488.html","title":{"rendered":"Linux\u4e0bC\u8bed\u8a00\u7684zlib\u538b\u7f29"},"content":{"rendered":"

=Start=<\/p>\n

\u7f18\u7531\uff1a<\/h4>\n

\u5b66\u4e60\u9700\u8981<\/p>\n

\u6b63\u6587\uff1a<\/h4>\n

\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n

\u5b57\u7b26\u4e32\u538b\u7f29<\/p>\n

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#include <stdio.h><\/code><\/div>\n
#include <string.h>\u00a0\u00a0<\/code>\/\/ for strlen<\/code><\/div>\n
#include <<\/code>assert<\/code>.h><\/code><\/div>\n
#include\u00a0<\/code>\"zlib.h\"<\/code><\/div>\n
\/*<\/code><\/div>\n
https:\/\/gist.githubusercontent.com\/arq5x\/5315739\/raw\/9a7e9569779d7771b643dc1840cbbea16a9b933f\/zlib-example.cpp<\/a><\/code><\/div>\n
http:\/\/stackoverflow.com\/questions\/7540259\/deflate-and-inflate-zlib-h-in-c<\/a><\/code><\/div>\n
*\/<\/code><\/div>\n
<\/div>\n
int<\/code>\u00a0main(<\/code>int<\/code>\u00a0argc,\u00a0<\/code>char<\/code>* argv[])<\/code><\/div>\n
{\u00a0\u00a0<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ original string len = 36<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>char<\/code>\u00a0a[<\/code>50<\/code>] =\u00a0<\/code>\"Hello Hello Hello Hello Hello Hello!\"<\/code>;<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ placeholder for the compressed (deflated) version of \"a\"<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>char<\/code>\u00a0b[<\/code>50<\/code>];<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ placeholder for the UNcompressed (inflated) version of \"b\"<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>char<\/code>\u00a0c[<\/code>50<\/code>];<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"sizeof(a) = %d\\n\"<\/code>, sizeof(a));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"sizeof(b) = %d\\n\"<\/code>, sizeof(b));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"sizeof(c) = %d\\n\"<\/code>, sizeof(c));<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"Original size is: %lu\\n\"<\/code>, strlen(a));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"Original string is: %s\\n\"<\/code>, a);<\/code><\/div>\n
<\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"\\n----------\\n\\n\"<\/code>);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ STEP 1.<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ deflate a into b. (that is, compress a into b)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ zlib struct<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>z_stream defstream;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>defstream.zalloc = Z_NULL;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>defstream.zfree = Z_NULL;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>defstream.opaque = Z_NULL;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ setup \"a\" as the input and \"b\" as the compressed output<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>defstream.avail_in = (uInt)strlen(a)+<\/code>1<\/code>;\u00a0<\/code>\/\/ size of input, string + terminator<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>defstream.next_in = (Bytef *)a;\u00a0<\/code>\/\/ input char array<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>defstream.avail_out = (uInt)sizeof(b);\u00a0<\/code>\/\/ size of output<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>defstream.next_out = (Bytef *)b;\u00a0<\/code>\/\/ output char array<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ the actual compression work.<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>deflateInit(&defstream, Z_BEST_COMPRESSION);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>deflate(&defstream, Z_FINISH);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>deflateEnd(&defstream);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ This is one way of getting the size of the output<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"Compressed size is: %lu\\n\"<\/code>, strlen(b));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"Compressed string is: %s\\n\"<\/code>, b);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"\\n----------\\n\\n\"<\/code>);<\/code><\/div>\n
<\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ STEP 2.<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ inflate b into c<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ zlib struct<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>z_stream infstream;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>infstream.zalloc = Z_NULL;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>infstream.zfree = Z_NULL;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>infstream.opaque = Z_NULL;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ setup \"b\" as the input and \"c\" as the compressed output<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>infstream.avail_in = (uInt)((<\/code>char<\/code>*)defstream.next_out - b);\u00a0<\/code>\/\/ size of input<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>infstream.next_in = (Bytef *)b;\u00a0<\/code>\/\/ input char array<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>infstream.avail_out = (uInt)sizeof(c);\u00a0<\/code>\/\/ size of output<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>infstream.next_out = (Bytef *)c;\u00a0<\/code>\/\/ output char array<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ the actual DE-compression work.<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>inflateInit(&infstream);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>inflate(&infstream, Z_NO_FLUSH);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>inflateEnd(&infstream);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"Uncompressed size is: %lu\\n\"<\/code>, strlen(c));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"Uncompressed string is: %s\\n\"<\/code>, c);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ make sure uncompressed is exactly equal to original.<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>assert<\/code>(strcmp(a,c)==<\/code>0<\/code>);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

&<\/p>\n

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#include <stdio.h><\/code><\/div>\n
#include <zlib.h><\/code><\/div>\n
#include <stdlib.h><\/code><\/div>\n
#include <string.h><\/code><\/div>\n
<\/div>\n
\/* CHUNK is the size of the memory chunk used by the zlib routines. *\/<\/code><\/div>\n
<\/div>\n
#define CHUNK\u00a0<\/code>0x4000<\/code><\/div>\n
<\/div>\n
\/* The following macro calls a zlib routine and checks the return<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>value. If the return value (\"status\") is not OK, it prints an error<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>message and exits the program. Zlib's error statuses are all less<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>than zero. *\/<\/code><\/div>\n
<\/div>\n
#define CALL_ZLIB(x) {\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \\<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code>\u00a0status;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \\<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>status = x;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \\<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(status <\u00a0<\/code>0<\/code>) {\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \\<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>fprintf (stderr,\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \\<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>\"%s:%d: %s returned a bad status of %d.\\n\"<\/code>,\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \\<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>__FILE__, __LINE__, #x, status);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \\<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>exit (EXIT_FAILURE);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \\<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>}\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \\<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
<\/div>\n
\/* These are parameters to deflateInit2. See<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>http:\/\/zlib.net\/manual.html<\/a>\u00a0for the exact meanings. *\/<\/code><\/div>\n
<\/div>\n
#define windowBits\u00a0<\/code>15<\/code><\/div>\n
#define GZIP_ENCODING\u00a0<\/code>16<\/code><\/div>\n
<\/div>\n
static<\/code>\u00a0void<\/code>\u00a0strm_init (z_stream * strm)<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>strm->zalloc = Z_NULL;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>strm->zfree\u00a0 = Z_NULL;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>strm->opaque = Z_NULL;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>CALL_ZLIB (deflateInit2 (strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED,<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>windowBits | GZIP_ENCODING,\u00a0<\/code>8<\/code>,<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>Z_DEFAULT_STRATEGY));<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
\/* Example text to print out. *\/<\/code><\/div>\n
static<\/code>\u00a0const<\/code>\u00a0char<\/code>\u00a0* message =<\/code><\/div>\n
\"Shall I compare thee to a summer's day?\\n\"<\/code><\/div>\n
\"Thou art more lovely and more temperate:\\n\"<\/code><\/div>\n
\"Rough winds do shake the darling buds of May,\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
;<\/code><\/div>\n
\/*<\/code><\/div>\n
$ .\/a.out | wc<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6\u00a0\u00a0\u00a0\u00a0 160<\/code><\/div>\n
$ .\/a.out | gzip -d | wc<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>23\u00a0\u00a0\u00a0\u00a0 204\u00a0\u00a0\u00a0 1047<\/code><\/div>\n
\u00a0<\/code>*\/<\/code><\/div>\n
<\/div>\n
\/*<\/code><\/div>\n
static const char * message =<\/code><\/div>\n
\"Shall I compare thee to a summer's day?\\n\"<\/code><\/div>\n
\"Thou art more lovely and more temperate:\\n\"<\/code><\/div>\n
\"Rough winds do shake the darling buds of May,\\n\"<\/code><\/div>\n
\"And summer's lease hath all too short a date;\\n\"<\/code><\/div>\n
;<\/code><\/div>\n
$ .\/a.out | wc<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 5\u00a0\u00a0\u00a0\u00a0 150<\/code><\/div>\n
$ .\/a.out | gzip -d | wc<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>4\u00a0\u00a0\u00a0\u00a0\u00a0 33\u00a0\u00a0\u00a0\u00a0 173<\/code><\/div>\n
\u00a0<\/code>*\/<\/code><\/div>\n
<\/div>\n
int<\/code>\u00a0main ()<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>unsigned\u00a0<\/code>char<\/code>\u00a0out[CHUNK];<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>z_stream strm;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>strm_init (& strm);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>strm.next_in = (unsigned\u00a0<\/code>char<\/code>\u00a0*) message;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>strm.avail_in = strlen (message);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>do<\/code>\u00a0{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code>\u00a0have;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>strm.avail_out = CHUNK;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>strm.next_out = out;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>CALL_ZLIB (deflate (& strm, Z_FINISH));<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>have = CHUNK - strm.avail_out;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>fwrite (out, sizeof (<\/code>char<\/code>), have, stdout);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>while<\/code>\u00a0(strm.avail_out ==\u00a0<\/code>0<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>deflateEnd (& strm);<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n
\/*<\/code><\/div>\n
$ gcc compress_with_zlib.c -lz<\/code><\/div>\n
*\/<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n