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#include <zlib.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(void) {
int ret;
z_stream strm;
char inp[] = "Hello, world!\n";
uInt inp_sz = strlen(inp) + 1; // +1 for '\0'
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = inp_sz;
strm.next_in = inp;
ret = deflateInit2(&strm,
Z_DEFAULT_COMPRESSION,
Z_DEFLATED,
MAX_WBITS | 16, // Gzip compatible compression
8, // Default memory
Z_DEFAULT_STRATEGY);
if (ret != Z_OK) {
fprintf(stderr, "failed: deflateInit2\n");
return EXIT_FAILURE;
}
uLong out_sz = deflateBound(&strm, inp_sz);
char out[out_sz];
strm.avail_out = out_sz;
strm.next_out = out;
ret = deflate(&strm, Z_FINISH);
if (ret != Z_STREAM_END) {
fprintf(stderr, "failed: deflate\n");
return EXIT_FAILURE;
}
fwrite(out, sizeof *out, strm.total_out, stdout);
deflateEnd(&strm);
return EXIT_SUCCESS;
}
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