gzip demo

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#include <stdio.h>#include <zlib.h>// Demoint decompress_file(char *infilename, char *outfilename){    int num_read = 0;    char buffer[128];    gzFile infile = gzopen(infilename, "rb");    FILE *outfile = fopen(outfilename, "wb");    if (!infile || !outfile) {        return -1;    }    while ((num_read = gzread(infile, buffer, sizeof(buffer))) > 0) {        fwrite(buffer, 1, num_read, outfile);    }    gzclose(infile);    fclose(outfile);}int compress_file(char *infilename, char *outfilename){    int num_read = 0;    char inbuffer[128];    FILE *infile = fopen(infilename, "rb");    gzFile outfile = gzopen(outfilename, "wb");    if (!infile || !outfile) {        return -1;    }    while ((num_read = fread(inbuffer, 1, sizeof(inbuffer), infile)) > 0) {        total_read += num_read;        gzwrite(outfile, inbuffer, num_read);    }    fclose(infile);    gzclose(outfile);}int main(int argc, char **argv){    compress_file(argv[1],argv[2]);    decompress_file(argv[2],argv[3]);}

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