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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gio/gio.h>
#include "libgimpbase/gimpbase.h"
#include "core/core-types.h"
#include "xcf-private.h"
#include "xcf-read.h"
#include "gimp-intl.h"
#define MAX_XCF_STRING_LEN (16L * 1024 * 1024)
guint
xcf_read_int8 (XcfInfo *info,
guint8 *data,
gint count)
{
gsize bytes_read = 0;
/* we allow for 'data == NULL && count == 0', which g_input_stream_read_all()
* rejects.
*/
if (count > 0)
{
g_input_stream_read_all (info->input, data, count,
&bytes_read, NULL, NULL);
info->cp += bytes_read;
}
return bytes_read;
}
guint
xcf_read_int16 (XcfInfo *info,
guint16 *data,
gint count)
{
guint total = 0;
if (count > 0)
{
total += xcf_read_int8 (info, (guint8 *) data, count * 2);
while (count--)
{
*data = g_ntohs (*data);
data++;
}
}
return total;
}
guint
xcf_read_int32 (XcfInfo *info,
guint32 *data,
gint count)
{
guint total = 0;
if (count > 0)
{
total += xcf_read_int8 (info, (guint8 *) data, count * 4);
while (count--)
{
*data = g_ntohl (*data);
data++;
}
}
return total;
}
guint
xcf_read_int64 (XcfInfo *info,
guint64 *data,
gint count)
{
guint total = 0;
if (count > 0)
{
total += xcf_read_int8 (info, (guint8 *) data, count * 8);
while (count--)
{
*data = GINT64_FROM_BE (*data);
data++;
}
}
return total;
}
guint
xcf_read_offset (XcfInfo *info,
goffset *data,
gint count)
{
guint total = 0;
if (count > 0)
{
if (info->bytes_per_offset == 4)
{
gint32 *int_offsets = g_alloca (count * sizeof (gint32));
total += xcf_read_int8 (info, (guint8 *) int_offsets, count * 4);
while (count--)
{
*data = g_ntohl (*int_offsets);
int_offsets++;
data++;
}
}
else
{
total += xcf_read_int8 (info, (guint8 *) data, count * 8);
while (count--)
{
*data = GINT64_FROM_BE (*data);
data++;
}
}
}
return total;
}
guint
xcf_read_float (XcfInfo *info,
gfloat *data,
gint count)
{
return xcf_read_int32 (info, (guint32 *) ((void *) data), count);
}
guint
xcf_read_string (XcfInfo *info,
gchar **data,
gint count)
{
guint total = 0;
gint i;
for (i = 0; i < count; i++)
{
guint32 tmp;
total += xcf_read_int32 (info, &tmp, 1);
if (tmp > MAX_XCF_STRING_LEN)
{
g_warning ("Maximum string length (%ld bytes) exceeded. "
"Possibly corrupt XCF file.", MAX_XCF_STRING_LEN);
data[i] = NULL;
}
else if (tmp > 0)
{
gchar *str;
str = g_new (gchar, tmp);
total += xcf_read_int8 (info, (guint8*) str, tmp);
if (str[tmp - 1] != '\0')
str[tmp - 1] = '\0';
data[i] = gimp_any_to_utf8 (str, -1,
_("Invalid UTF-8 string in XCF file"));
g_free (str);
}
else
{
data[i] = NULL;
}
}
return total;
}
guint
xcf_read_component (XcfInfo *info,
gint bpc,
guint8 *data,
gint count)
{
switch (bpc)
{
case 1:
return xcf_read_int8 (info, data, count);
case 2:
return xcf_read_int16 (info, (guint16 *) data, count);
case 4:
return xcf_read_int32 (info, (guint32 *) data, count);
case 8:
return xcf_read_int64 (info, (guint64 *) data, count);
default:
break;
}
return 0;
}
void
xcf_read_from_be (gint bpc,
guint8 *data,
gint count)
{
gint i;
switch (bpc)
{
case 1:
break;
case 2:
{
guint16 *d = (guint16 *) data;
for (i = 0; i < count; i++)
d[i] = g_ntohs (d[i]);
}
break;
case 4:
{
guint32 *d = (guint32 *) data;
for (i = 0; i < count; i++)
d[i] = g_ntohl (d[i]);
}
break;
case 8:
{
guint64 *d = (guint64 *) data;
for (i = 0; i < count; i++)
d[i] = GINT64_FROM_BE (d[i]);
}
break;
}
}
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