Erstes Beispiel für die Benutzung von zlib

1 files changed, 77 insertions, 0 deletions

diff --git a/src/simple.c b/src/simple.c
new file mode 100644
index 0000000..5209841
--- /dev/null
+++ b/src/simple.c
@@ -0,0 +1,77 @@
+// Standard C
+#include <stdio.h>
+#include <stdlib.h>
+
+// System
+#include <unistd.h>
+
+// zlib
+#include <zlib.h>
+
+static void
+usage(void)
+{
+        (void) fprintf(stderr, "compress [-d] infile outfile\n");
+        exit(EXIT_FAILURE);
+}
+
+int
+main(int argc, char *argv[])
+{
+        // int compress = 1;
+        int level = 5;
+
+        int opt = 0;
+        while ( (opt = getopt(argc, argv, "dl")) != -1 ) {
+                switch ( opt ) {
+                case 'd':
+                        // compress = 0; // decompress
+                        break;
+
+                case 'l':
+                        level = 9;
+                        break;
+
+                case '?':
+                default:
+                        usage();
+                        break;
+                }
+        }
+        argc -= optind;
+        argv += optind;
+
+        if ( argc != 2 ) {
+                usage();
+        }
+
+        FILE *in_file  = fopen(argv[0], "rb");
+        FILE *out_file = fopen(argv[1], "wb");
+
+        (void) fseek(in_file, 0, SEEK_END);
+        unsigned long insize = ftell(in_file); // max 2GB...
+        (void) fseek(in_file, 0, SEEK_SET);
+
+        unsigned char *indata = malloc(insize);
+        (void) fread(indata, 1, insize, in_file);
+
+        unsigned long  outsize = compressBound(insize);
+        unsigned char *outdata = malloc(outsize);
+
+        int res = compress2(outdata, &outsize, indata, insize, level);
+
+        if ( res == Z_OK ) {
+                (void) fwrite(outdata, 1, outsize, out_file);
+        }
+        else {
+                printf("Error: %d\n", res);
+        }
+
+        free(outdata);
+        free(indata);
+
+        (void) fclose(out_file);
+        (void) fclose(in_file);
+
+        return EXIT_SUCCESS;
+}