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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
*
* Copyright (C) 2013 Colin Walters <walters@verbum.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "libgsystem.h"
#include "bupsplit.h"
#define BLOB_MAX (8192*4)
static GPtrArray *
rollsum_checksums_for_data (GBytes *bytes)
{
const guint8 *start;
gsize len;
gboolean rollsum_end = FALSE;
GPtrArray *ret = g_ptr_array_new_with_free_func ((GDestroyNotify)g_variant_unref);
start = g_bytes_get_data (bytes, &len);
while (len > 0)
{
int offset, bits;
if (!rollsum_end)
{
offset = bupsplit_find_ofs (start, MIN(G_MAXINT32, len), &bits);
if (offset == 0)
{
rollsum_end = TRUE;
offset = MIN(BLOB_MAX, len);
}
else if (offset > BLOB_MAX)
offset = BLOB_MAX;
}
else
offset = MIN(BLOB_MAX, len);
{
gs_free char *blobcsum =
g_compute_checksum_for_data (G_CHECKSUM_SHA256,
start, offset);
g_ptr_array_add (ret, g_variant_ref_sink (g_variant_new ("(st)",
blobcsum, (guint64)offset)));
}
start += offset;
len -= offset;
}
return ret;
}
static void
print_rollsums (GPtrArray *rollsums)
{
guint i;
for (i = 0; i < rollsums->len; i++)
{
GVariant *sum = rollsums->pdata[i];
const char *csum;
guint64 val;
g_variant_get (sum, "(&st)", &csum, &val);
g_print ("chunk %s %" G_GUINT64_FORMAT "\n", csum, val);
}
}
int
main (int argc, char **argv)
{
GCancellable *cancellable = NULL;
GError *local_error = NULL;
GError **error = &local_error;
gs_unref_object GFile *path = NULL;
GBytes *bytes = NULL;
g_setenv ("GIO_USE_VFS", "local", TRUE);
if (argc == 2)
{
gs_unref_ptrarray GPtrArray *rollsums = NULL;
path = g_file_new_for_path (argv[1]);
bytes = gs_file_map_readonly (path, cancellable, error);
if (!bytes)
goto out;
rollsums = rollsum_checksums_for_data (bytes);
print_rollsums (rollsums);
}
else if (argc > 2)
{
guint i;
gs_unref_hashtable GHashTable *sums = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
guint64 input_size = 0;
guint64 rollsum_size = 0;
for (i = 1; i < argc; i++)
{
guint j;
gs_unref_ptrarray GPtrArray *rollsums = NULL;
guint64 this_rollsum_size = 0;
path = g_file_new_for_path (argv[i]);
bytes = gs_file_map_readonly (path, cancellable, error);
if (!bytes)
goto out;
input_size += g_bytes_get_size (bytes);
g_print ("input: %s size: %" G_GUINT64_FORMAT "\n", argv[i], g_bytes_get_size (bytes));
rollsums = rollsum_checksums_for_data (bytes);
print_rollsums (rollsums);
for (j = 0; j < rollsums->len; j++)
{
GVariant *sum = rollsums->pdata[j];
const char *csum;
guint64 ofs;
g_variant_get (sum, "(&st)", &csum, &ofs);
if (!g_hash_table_contains (sums, csum))
{
g_hash_table_add (sums, g_strdup (csum));
rollsum_size += ofs;
}
this_rollsum_size += ofs;
}
g_print ("input: rollsum size: %" G_GUINT64_FORMAT "\n", this_rollsum_size);
}
g_print ("rollsum total:%u input:%" G_GUINT64_FORMAT " output: %" G_GUINT64_FORMAT " speedup:%f\n",
g_hash_table_size (sums), input_size, rollsum_size,
(((double)(input_size+1)) / ((double) rollsum_size + 1)));
}
else
{
bupsplit_selftest ();
}
out:
g_clear_pointer (&bytes, g_bytes_unref);
if (local_error)
{
g_printerr ("%s\n", local_error->message);
g_error_free (local_error);
return 1;
}
return 0;
}
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