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91 lines
1.9 KiB
C
91 lines
1.9 KiB
C
/*
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* Compresses data to the DEFLATE format.
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* The compressed data is ready to use with inflatemem().
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* Compile using e.g.
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* gcc -O2 -o deflater deflater.c -lz
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*
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* Author: Piotr Fusik <fox@scene.pl>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <zlib.h>
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#define IN_SIZE_MAX 60000U
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#define OUT_SIZE_MAX 60000U
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int main(int argc, char* argv[])
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{
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FILE* fp;
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char* inbuf;
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char* outbuf;
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size_t inlen;
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size_t outlen;
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z_stream stream;
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/* check command line */
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if (argc != 3) {
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fprintf(stderr,
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"Compresses a file to the DEFLATE format.\n"
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"24 Aug 2002, Piotr Fusik <fox@scene.pl>\n"
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"Usage: deflater input_file deflated_file\n"
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);
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return 3;
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}
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/* alloc buffers */
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inbuf = malloc(IN_SIZE_MAX);
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outbuf = malloc(OUT_SIZE_MAX);
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if (inbuf == NULL || outbuf == NULL) {
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fprintf(stderr, "deflater: Out of memory!\n");
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return 1;
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}
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/* read input file */
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fp = fopen(argv[1], "rb");
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if (fp == NULL) {
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perror(argv[1]);
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return 1;
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}
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inlen = fread(inbuf, 1, IN_SIZE_MAX, fp);
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fclose(fp);
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/* compress */
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stream.next_in = inbuf;
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stream.avail_in = inlen;
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stream.next_out = outbuf;
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stream.avail_out = OUT_SIZE_MAX;
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stream.zalloc = (alloc_func) 0;
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stream.zfree = (free_func) 0;
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if (deflateInit2(&stream, Z_BEST_COMPRESSION, Z_DEFLATED,
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-MAX_WBITS, 9, Z_DEFAULT_STRATEGY) != Z_OK) {
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fprintf(stderr, "deflater: deflateInit2 failed\n");
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return 1;
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}
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if (deflate(&stream, Z_FINISH) != Z_STREAM_END) {
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fprintf(stderr, "deflater: deflate failed\n");
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return 1;
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}
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if (deflateEnd(&stream) != Z_OK) {
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fprintf(stderr, "deflater: deflateEnd failed\n");
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return 1;
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}
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/* write output */
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fp = fopen(argv[2], "wb");
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if (fp == NULL) {
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perror(argv[2]);
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return 1;
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}
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outlen = fwrite(outbuf, 1, stream.total_out, fp);
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fclose(fp);
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if (outlen != stream.total_out) {
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perror(argv[2]);
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return 1;
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}
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/* display summary */
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printf("Compressed %s (%d bytes) to %s (%d bytes)\n",
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argv[1], inlen, argv[2], outlen);
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return 0;
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}
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