From 417b4381dda4b88a1e382f821c8964cf8954307e Mon Sep 17 00:00:00 2001
From: David Monniaux <david.monniaux@univ-grenoble-alpes.fr>
Date: Tue, 29 Jan 2019 22:31:50 +0100
Subject: https://github.com/pfalcon/uzlib

---
 test/monniaux/uzlib/examples/tgzip/tgzip.c | 120 +++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 test/monniaux/uzlib/examples/tgzip/tgzip.c

(limited to 'test/monniaux/uzlib/examples/tgzip/tgzip.c')

diff --git a/test/monniaux/uzlib/examples/tgzip/tgzip.c b/test/monniaux/uzlib/examples/tgzip/tgzip.c
new file mode 100644
index 00000000..505169cb
--- /dev/null
+++ b/test/monniaux/uzlib/examples/tgzip/tgzip.c
@@ -0,0 +1,120 @@
+/*
+ * tgzip  -  gzip compressor example
+ *
+ * Copyright (c) 2003 by Joergen Ibsen / Jibz
+ * Copyright (c) 2014-2018 by Paul Sokolovsky
+ *
+ * http://www.ibsensoftware.com/
+ *
+ * This software is provided 'as-is', without any express
+ * or implied warranty.  In no event will the authors be
+ * held liable for any damages arising from the use of
+ * this software.
+ *
+ * Permission is granted to anyone to use this software
+ * for any purpose, including commercial applications,
+ * and to alter it and redistribute it freely, subject to
+ * the following restrictions:
+ *
+ * 1. The origin of this software must not be
+ *    misrepresented; you must not claim that you
+ *    wrote the original software. If you use this
+ *    software in a product, an acknowledgment in
+ *    the product documentation would be appreciated
+ *    but is not required.
+ *
+ * 2. Altered source versions must be plainly marked
+ *    as such, and must not be misrepresented as
+ *    being the original software.
+ *
+ * 3. This notice may not be removed or altered from
+ *    any source distribution.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "uzlib.h"
+
+void exit_error(const char *what)
+{
+   printf("ERROR: %s\n", what);
+   exit(1);
+}
+
+int main(int argc, char *argv[])
+{
+    FILE *fin, *fout;
+    unsigned int len;
+    unsigned char *source;
+
+    printf("tgzip - example from the uzlib library\n\n");
+
+    if (argc < 3)
+    {
+       printf(
+          "Syntax: tgunzip <source> <destination>\n\n"
+          "Both input and output are kept in memory, so do not use this on huge files.\n");
+
+       return 1;
+    }
+
+    /* -- open files -- */
+
+    if ((fin = fopen(argv[1], "rb")) == NULL) exit_error("source file");
+
+    if ((fout = fopen(argv[2], "wb")) == NULL) exit_error("destination file");
+
+    /* -- read source -- */
+
+    fseek(fin, 0, SEEK_END);
+
+    len = ftell(fin);
+
+    fseek(fin, 0, SEEK_SET);
+
+    source = (unsigned char *)malloc(len);
+
+    if (source == NULL) exit_error("memory");
+
+    if (fread(source, 1, len, fin) != len) exit_error("read");
+
+    fclose(fin);
+
+    /* -- compress data -- */
+
+    struct uzlib_comp comp = {0};
+    comp.dict_size = 32768;
+    comp.hash_bits = 12;
+    size_t hash_size = sizeof(uzlib_hash_entry_t) * (1 << comp.hash_bits);
+    comp.hash_table = malloc(hash_size);
+    memset(comp.hash_table, 0, hash_size);
+
+    zlib_start_block(&comp.out);
+    uzlib_compress(&comp, source, len);
+    zlib_finish_block(&comp.out);
+
+    printf("compressed to %u raw bytes\n", comp.out.outlen);
+
+    /* -- write output -- */
+
+    putc(0x1f, fout);
+    putc(0x8b, fout);
+    putc(0x08, fout);
+    putc(0x00, fout); // FLG
+    int mtime = 0;
+    fwrite(&mtime, sizeof(mtime), 1, fout);
+    putc(0x04, fout); // XFL
+    putc(0x03, fout); // OS
+
+    fwrite(comp.out.outbuf, 1, comp.out.outlen, fout);
+
+    unsigned crc = ~uzlib_crc32(source, len, ~0);
+    fwrite(&crc, sizeof(crc), 1, fout);
+    fwrite(&len, sizeof(len), 1, fout);
+
+    fclose(fout);
+
+    return 0;
+}
-- 
cgit