Imported Upstream version 2.03upstream/2.03

1 files changed, 642 insertions, 0 deletions

diff --git a/examples/lzopack.c b/examples/lzopack.c
new file mode 100644
index 0000000..6a3d848
--- /dev/null
+++ b/examples/lzopack.c
@@ -0,0 +1,642 @@
+/* lzopack.c -- LZO example program: a simple file packer
+
+   This file is part of the LZO real-time data compression library.
+
+   Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
+   Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
+   All Rights Reserved.
+
+   The LZO library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2 of
+   the License, or (at your option) any later version.
+
+   The LZO library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with the LZO library; see the file COPYING.
+   If not, write to the Free Software Foundation, Inc.,
+   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+   Markus F.X.J. Oberhumer
+   <markus@oberhumer.com>
+   http://www.oberhumer.com/opensource/lzo/
+ */
+
+
+/*************************************************************************
+// NOTE: this is an example program, so do not use to backup your data.
+//
+// This program lacks things like sophisticated file handling but is
+// pretty complete regarding compression - it should provide a good
+// starting point for adaption for your applications.
+//
+// Please study LZO.FAQ and simple.c first.
+**************************************************************************/
+
+#include "lzo/lzoconf.h"
+#include "lzo/lzo1x.h"
+
+/* portability layer */
+#define WANT_LZO_MALLOC 1
+#define WANT_LZO_FREAD 1
+#define WANT_LZO_WILDARGV 1
+#include "examples/portab.h"
+
+
+static const char *progname = NULL;
+
+static unsigned long total_in = 0;
+static unsigned long total_out = 0;
+static lzo_bool opt_debug = 0;
+
+/* magic file header for lzopack-compressed files */
+static const unsigned char magic[7] =
+    { 0x00, 0xe9, 0x4c, 0x5a, 0x4f, 0xff, 0x1a };
+
+
+/*************************************************************************
+// file IO
+**************************************************************************/
+
+lzo_uint xread(FILE *fp, lzo_voidp buf, lzo_uint len, lzo_bool allow_eof)
+{
+    lzo_uint l;
+
+    l = (lzo_uint) lzo_fread(fp, buf, len);
+    if (l > len)
+    {
+        fprintf(stderr, "\nsomething's wrong with your C library !!!\n");
+        exit(1);
+    }
+    if (l != len && !allow_eof)
+    {
+        fprintf(stderr, "\nread error - premature end of file\n");
+        exit(1);
+    }
+    total_in += (unsigned long) l;
+    return l;
+}
+
+lzo_uint xwrite(FILE *fp, const lzo_voidp buf, lzo_uint len)
+{
+    if (fp != NULL && lzo_fwrite(fp, buf, len) != len)
+    {
+        fprintf(stderr, "\nwrite error  (disk full ?)\n");
+        exit(1);
+    }
+    total_out += (unsigned long) len;
+    return len;
+}
+
+
+int xgetc(FILE *fp)
+{
+    unsigned char c;
+    xread(fp, (lzo_voidp) &c, 1, 0);
+    return c;
+}
+
+void xputc(FILE *fp, int c)
+{
+    unsigned char cc = (unsigned char) (c & 0xff);
+    xwrite(fp, (const lzo_voidp) &cc, 1);
+}
+
+/* read and write portable 32-bit integers */
+
+lzo_uint32 xread32(FILE *fp)
+{
+    unsigned char b[4];
+    lzo_uint32 v;
+
+    xread(fp, b, 4, 0);
+    v  = (lzo_uint32) b[3] <<  0;
+    v |= (lzo_uint32) b[2] <<  8;
+    v |= (lzo_uint32) b[1] << 16;
+    v |= (lzo_uint32) b[0] << 24;
+    return v;
+}
+
+void xwrite32(FILE *fp, lzo_xint v)
+{
+    unsigned char b[4];
+
+    b[3] = (unsigned char) ((v >>  0) & 0xff);
+    b[2] = (unsigned char) ((v >>  8) & 0xff);
+    b[1] = (unsigned char) ((v >> 16) & 0xff);
+    b[0] = (unsigned char) ((v >> 24) & 0xff);
+    xwrite(fp, b, 4);
+}
+
+
+/*************************************************************************
+// compress
+//
+// possible improvement: we could use overlapping compression to
+//   save some memory - see overlap.c. This would require some minor
+//   changes in the decompression code as well, because if a block
+//   turns out to be incompressible we would still have to store it in its
+//   "compressed" (i.e. then slightly enlarged) form because the original
+//   (uncompressed) data would have been lost during the overlapping
+//   compression.
+**************************************************************************/
+
+int do_compress(FILE *fi, FILE *fo, int level, lzo_uint block_size)
+{
+    int r = 0;
+    lzo_bytep in = NULL;
+    lzo_bytep out = NULL;
+    lzo_bytep wrkmem = NULL;
+    lzo_uint in_len;
+    lzo_uint out_len;
+    lzo_uint32 wrk_len = 0;
+    lzo_uint32 flags = 1;       /* do compute a checksum */
+    int method = 1;             /* compression method: LZO1X */
+    lzo_uint32 checksum;
+
+    total_in = total_out = 0;
+
+/*
+ * Step 1: write magic header, flags & block size, init checksum
+ */
+    xwrite(fo, magic, sizeof(magic));
+    xwrite32(fo, flags);
+    xputc(fo, method);          /* compression method */
+    xputc(fo, level);           /* compression level */
+    xwrite32(fo, block_size);
+    checksum = lzo_adler32(0, NULL, 0);
+
+/*
+ * Step 2: allocate compression buffers and work-memory
+ */
+    in = (lzo_bytep) lzo_malloc(block_size);
+    out = (lzo_bytep) lzo_malloc(block_size + block_size / 16 + 64 + 3);
+    if (level == 9)
+        wrk_len = LZO1X_999_MEM_COMPRESS;
+    else
+        wrk_len = LZO1X_1_MEM_COMPRESS;
+    wrkmem = (lzo_bytep) lzo_malloc(wrk_len);
+    if (in == NULL || out == NULL || wrkmem == NULL)
+    {
+        printf("%s: out of memory\n", progname);
+        r = 1;
+        goto err;
+    }
+
+/*
+ * Step 3: process blocks
+ */
+    for (;;)
+    {
+        /* read block */
+        in_len = xread(fi, in, block_size, 1);
+        if (in_len <= 0)
+            break;
+
+        /* update checksum */
+        if (flags & 1)
+            checksum = lzo_adler32(checksum, in, in_len);
+
+        /* clear wrkmem (not needed, only for debug/benchmark purposes) */
+        if (opt_debug)
+            lzo_memset(wrkmem, 0xff, wrk_len);
+
+        /* compress block */
+        if (level == 9)
+            r = lzo1x_999_compress(in, in_len, out, &out_len, wrkmem);
+        else
+            r = lzo1x_1_compress(in, in_len, out, &out_len, wrkmem);
+        if (r != LZO_E_OK || out_len > in_len + in_len / 16 + 64 + 3)
+        {
+            /* this should NEVER happen */
+            printf("internal error - compression failed: %d\n", r);
+            r = 2;
+            goto err;
+        }
+
+        /* write uncompressed block size */
+        xwrite32(fo, in_len);
+
+        if (out_len < in_len)
+        {
+            /* write compressed block */
+            xwrite32(fo, out_len);
+            xwrite(fo, out, out_len);
+        }
+        else
+        {
+            /* not compressible - write uncompressed block */
+            xwrite32(fo, in_len);
+            xwrite(fo, in, in_len);
+        }
+    }
+
+    /* write EOF marker */
+    xwrite32(fo, 0);
+
+    /* write checksum */
+    if (flags & 1)
+        xwrite32(fo, checksum);
+
+    r = 0;
+err:
+    lzo_free(wrkmem);
+    lzo_free(out);
+    lzo_free(in);
+    return r;
+}
+
+
+/*************************************************************************
+// decompress / test
+//
+// We are using overlapping (in-place) decompression to save some
+// memory - see overlap.c.
+**************************************************************************/
+
+int do_decompress(FILE *fi, FILE *fo)
+{
+    int r = 0;
+    lzo_bytep buf = NULL;
+    lzo_uint buf_len;
+    unsigned char m [ sizeof(magic) ];
+    lzo_uint32 flags;
+    int method;
+    int level;
+    lzo_uint block_size;
+    lzo_uint32 checksum;
+
+    total_in = total_out = 0;
+
+/*
+ * Step 1: check magic header, read flags & block size, init checksum
+ */
+    if (xread(fi, m, sizeof(magic),1) != sizeof(magic) ||
+        memcmp(m, magic, sizeof(magic)) != 0)
+    {
+        printf("%s: header error - this file is not compressed by lzopack\n", progname);
+        r = 1;
+        goto err;
+    }
+    flags = xread32(fi);
+    method = xgetc(fi);
+    level = xgetc(fi);
+    if (method != 1)
+    {
+        printf("%s: header error - invalid method %d (level %d)\n",
+                progname, method, level);
+        r = 2;
+        goto err;
+    }
+    block_size = xread32(fi);
+    if (block_size < 1024 || block_size > 8*1024*1024L)
+    {
+        printf("%s: header error - invalid block size %ld\n",
+                progname, (long) block_size);
+        r = 3;
+        goto err;
+    }
+    checksum = lzo_adler32(0,NULL,0);
+
+/*
+ * Step 2: allocate buffer for in-place decompression
+ */
+    buf_len = block_size + block_size / 16 + 64 + 3;
+    buf = (lzo_bytep) lzo_malloc(buf_len);
+    if (buf == NULL)
+    {
+        printf("%s: out of memory\n", progname);
+        r = 4;
+        goto err;
+    }
+
+/*
+ * Step 3: process blocks
+ */
+    for (;;)
+    {
+        lzo_bytep in;
+        lzo_bytep out;
+        lzo_uint in_len;
+        lzo_uint out_len;
+
+        /* read uncompressed size */
+        out_len = xread32(fi);
+
+        /* exit if last block (EOF marker) */
+        if (out_len == 0)
+            break;
+
+        /* read compressed size */
+        in_len = xread32(fi);
+
+        /* sanity check of the size values */
+        if (in_len > block_size || out_len > block_size ||
+            in_len == 0 || in_len > out_len)
+        {
+            printf("%s: block size error - data corrupted\n", progname);
+            r = 5;
+            goto err;
+        }
+
+        /* place compressed block at the top of the buffer */
+        in = buf + buf_len - in_len;
+        out = buf;
+
+        /* read compressed block data */
+        xread(fi, in, in_len, 0);
+
+        if (in_len < out_len)
+        {
+            /* decompress - use safe decompressor as data might be corrupted
+             * during a file transfer */
+            lzo_uint new_len = out_len;
+
+            r = lzo1x_decompress_safe(in, in_len, out, &new_len, NULL);
+            if (r != LZO_E_OK || new_len != out_len)
+            {
+                printf("%s: compressed data violation\n", progname);
+                r = 6;
+                goto err;
+            }
+            /* write decompressed block */
+            xwrite(fo, out, out_len);
+            /* update checksum */
+            if (flags & 1)
+                checksum = lzo_adler32(checksum, out, out_len);
+        }
+        else
+        {
+            /* write original (incompressible) block */
+            xwrite(fo, in, in_len);
+            /* update checksum */
+            if (flags & 1)
+                checksum = lzo_adler32(checksum, in, in_len);
+        }
+    }
+
+    /* read and verify checksum */
+    if (flags & 1)
+    {
+        lzo_uint32 c = xread32(fi);
+        if (c != checksum)
+        {
+            printf("%s: checksum error - data corrupted\n", progname);
+            r = 7;
+            goto err;
+        }
+    }
+
+    r = 0;
+err:
+    lzo_free(buf);
+    return r;
+}
+
+
+/*************************************************************************
+//
+**************************************************************************/
+
+static void usage(void)
+{
+    printf("usage: %s [-9] input-file output-file  (compress)\n", progname);
+    printf("usage: %s -d   input-file output-file  (decompress)\n", progname);
+    printf("usage: %s -t   input-file...           (test)\n", progname);
+    exit(1);
+}
+
+
+/* open input file */
+static FILE *xopen_fi(const char *name)
+{
+    FILE *fp;
+
+    fp = fopen(name, "rb");
+    if (fp == NULL)
+    {
+        printf("%s: cannot open input file %s\n", progname, name);
+        exit(1);
+    }
+#if defined(HAVE_STAT) && defined(S_ISREG)
+    {
+        struct stat st;
+        int is_regular = 1;
+        if (stat(name, &st) != 0 || !S_ISREG(st.st_mode))
+            is_regular = 0;
+        if (!is_regular)
+        {
+            printf("%s: %s is not a regular file\n", progname, name);
+            fclose(fp); fp = NULL;
+            exit(1);
+        }
+    }
+#endif
+    return fp;
+}
+
+
+/* open output file */
+static FILE *xopen_fo(const char *name)
+{
+    FILE *fp;
+
+#if 0
+    /* this is an example program, so make sure we don't overwrite a file */
+    fp = fopen(name, "rb");
+    if (fp != NULL)
+    {
+        printf("%s: file %s already exists -- not overwritten\n", progname, name);
+        fclose(fp); fp = NULL;
+        exit(1);
+    }
+#endif
+    fp = fopen(name, "wb");
+    if (fp == NULL)
+    {
+        printf("%s: cannot open output file %s\n", progname, name);
+        exit(1);
+    }
+    return fp;
+}
+
+
+/* close file */
+static void xclose(FILE *fp)
+{
+    if (fp)
+    {
+        int err;
+        err = ferror(fp);
+        if (fclose(fp) != 0)
+            err = 1;
+        if (err)
+        {
+            printf("%s: error while closing file\n", progname);
+            exit(1);
+        }
+    }
+}
+
+
+/*************************************************************************
+//
+**************************************************************************/
+
+int __lzo_cdecl_main main(int argc, char *argv[])
+{
+    int i = 1;
+    int r = 0;
+    FILE *fi = NULL;
+    FILE *fo = NULL;
+    const char *in_name = NULL;
+    const char *out_name = NULL;
+    lzo_bool opt_decompress = 0;
+    lzo_bool opt_test = 0;
+    int opt_level = 1;
+    lzo_uint opt_block_size;
+    const char *s;
+
+    lzo_wildargv(&argc, &argv);
+
+    progname = argv[0];
+    for (s = progname; *s; s++)
+        if ((*s == '/' || *s == '\\') && s[1])
+            progname = s + 1;
+
+    printf("\nLZO real-time data compression library (v%s, %s).\n",
+           lzo_version_string(), lzo_version_date());
+    printf("Copyright (C) 1996-2008 Markus Franz Xaver Johannes Oberhumer\nAll Rights Reserved.\n\n");
+
+#if 0
+    printf(
+"*** DISCLAIMER ***\n"
+"   This is an example program, do not use to backup your data !\n"
+"   Get LZOP if you're interested into a full-featured packer.\n"
+"   See http://www.oberhumer.com/opensource/lzop/\n"
+"\n");
+#endif
+
+
+/*
+ * Step 1: initialize the LZO library
+ */
+    if (lzo_init() != LZO_E_OK)
+    {
+        printf("internal error - lzo_init() failed !!!\n");
+        printf("(this usually indicates a compiler bug - try recompiling\nwithout optimizations, and enable `-DLZO_DEBUG' for diagnostics)\n");
+        exit(1);
+    }
+
+
+/*
+ * Step 2: setup memory
+ */
+    opt_block_size = 256 * 1024L;
+
+#if defined(ACC_MM_AHSHIFT)
+    /* reduce memory requirements for ancient 16-bit DOS 640kB real-mode */
+    if (ACC_MM_AHSHIFT != 3)
+        opt_block_size = 16 * 1024L;
+#endif
+
+
+/*
+ * Step 3: get options
+ */
+
+    while (i < argc && argv[i][0] == '-')
+    {
+        if (strcmp(argv[i],"-d") == 0)
+            opt_decompress = 1;
+        else if (strcmp(argv[i],"-t") == 0)
+            opt_test = 1;
+        else if (strcmp(argv[i],"-9") == 0)
+            opt_level = 9;
+        else if (argv[i][1] == 'b' && argv[i][2])
+        {
+            long b = atol(&argv[i][2]);
+            if (b >= 1024L && b <= 8*1024*1024L)
+                opt_block_size = (lzo_uint) b;
+            else
+            {
+                printf("%s: invalid block_size in option `%s'.\n", progname, argv[i]);
+                usage();
+            }
+        }
+        else if (strcmp(argv[i],"--debug") == 0)
+            opt_debug += 1;
+        else
+            usage();
+        i++;
+    }
+    if (opt_test && i >= argc)
+        usage();
+    if (!opt_test && i + 2 != argc)
+        usage();
+
+
+/*
+ * Step 4: process file(s)
+ */
+
+    if (opt_test)
+    {
+        while (i < argc && r == 0)
+        {
+            in_name = argv[i++];
+            fi = xopen_fi(in_name);
+            r = do_decompress(fi, NULL);
+            if (r == 0)
+                printf("%s: %s tested ok (%lu -> %lu bytes)\n",
+                        progname, in_name, total_in, total_out);
+            xclose(fi); fi = NULL;
+        }
+    }
+    else if (opt_decompress)
+    {
+        in_name = argv[i++];
+        out_name = argv[i++];
+        fi = xopen_fi(in_name);
+        fo = xopen_fo(out_name);
+        r = do_decompress(fi, fo);
+        if (r == 0)
+            printf("%s: decompressed %lu into %lu bytes\n",
+                    progname, total_in, total_out);
+    }
+    else /* compress */
+    {
+        in_name = argv[i++];
+        out_name = argv[i++];
+        fi = xopen_fi(in_name);
+        fo = xopen_fo(out_name);
+        r = do_compress(fi, fo, opt_level, opt_block_size);
+        if (r == 0)
+            printf("%s: compressed %lu into %lu bytes\n",
+                    progname, total_in, total_out);
+    }
+
+    xclose(fi); fi = NULL;
+    xclose(fo); fo = NULL;
+    return r;
+}
+
+/*
+vi:ts=4:et
+*/
+