gimp/libgimp/gserialize.c

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/* gserialize.h
* Copyright (C) 1998 Jay Cox <jaycox@earthlink.net>
*
* This library is free software; you can redistribute it and/or
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* 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
* Library General Public License for more details.
*
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* 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.
*/
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#include <string.h>
#include "gserialize.h"
struct _GSerialDescription
{
char *struct_name;
GSList *list;
};
struct _GSerialItem
{
GSerialType type; /* the type of this data member */
gulong offset; /* the offset into the struct of this item */
glong length; /* the number of elements (if this is an array) */
/* or -1 if this is a variable length array */
gulong length_offset; /* offset to the length of the array */
};
#define g_serial_copy_from_n g_serial_copy_to_n
static long g_serial_copy_to_n(char *dest, char *source, long data_size,
long n_items)
{
int i;
int length = n_items*data_size;
#if G_BYTE_ORDER == G_BIG_ENDIAN
memcpy(dest, source, length);
#else
switch (data_size)
{
case 1: memcpy(dest, source, n_items);
break;
case 2:
for (i = 0; i < length; i+=2)
{
dest[i] = source[i + 1];
dest[i+1] = source[i];
} break;
case 4:
for (i = 0; i < length; i+=4)
{
dest[i] = source[i + 3];
dest[i+1] = source[i + 2];
dest[i+2] = source[i + 1];
dest[i+3] = source[i];
} break;
case 8:
for (i = 0; i < length; i+=8)
{
dest[i] = source[i+7];
dest[i+1] = source[i+6];
dest[i+2] = source[i+5];
dest[i+3] = source[i+4];
dest[i+4] = source[i+3];
dest[i+5] = source[i+2];
dest[i+6] = source[i+1];
dest[i+7] = source[i];
} break;
default:
g_assert_not_reached();
}
#endif /* G_BYTE_ORDER != G_BIG_ENDIAN */
return length;
}
GSerialItem *g_new_serial_item(GSerialType type, gulong offset,
gint32 length, gulong length_offset)
{
GSerialItem *item = g_new(GSerialItem, 1);
item->type = type;
item->offset = offset;
item->length = length;
item->length_offset = length_offset;
return item;
}
GSerialDescription *g_new_serial_description(char *name, ...)
{
va_list argp;
void *tmp;
GSerialDescription *d = g_new(GSerialDescription, 1);
d->struct_name = g_strdup(name);
d->list = 0;
va_start(argp, name);
while ((tmp = va_arg (argp, void*)))
d->list = g_slist_append(d->list, tmp);
va_end(argp);
return d;
}
void g_free_serial_description(GSerialDescription *d)
{
g_free (d->struct_name);
while (d->list)
{
g_free(d->list->data);
d->list = g_slist_remove_link(d->list, d->list);
}
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g_free (d);
}
static int g_serial_item_is_array(GSerialItem *item)
{
if (item->type < GSERIAL_STRING)
return 0;
return 1;
}
static long g_serial_item_data_size(GSerialItem *item)
{
static long sizes[] = {0, 1, 2, 4, 4, 8, 1, 1, 2, 4, 4, 8};
if (item->type >= GSERIAL_STRING)
return sizes[item->type - 95];
return sizes[item->type];
}
static long g_serial_item_n_items(GSerialItem *item, void *struct_data)
{
if (item->type < GSERIAL_STRING)
return 1;
if (item->type == GSERIAL_STRING)
return (strlen(G_STRUCT_MEMBER(char*, struct_data, item->offset)) + 1);
if (item->length >= 0)
return item->length;
return (G_STRUCT_MEMBER(gint32, struct_data, item->length_offset));
}
static long g_serial_item_compute_length(GSerialItem *item, void *struct_data)
{
int length;
length = g_serial_item_n_items(item, struct_data) * g_serial_item_data_size(item);
length += g_serial_item_is_array(item) * 4;
return length + 1;
}
static long g_serial_description_compute_length(GSerialDescription *d,
void *struct_data)
{
long length = 0;
GSList *list;
list = d->list;
while (list)
{
length += g_serial_item_compute_length((GSerialItem *) list->data, struct_data);
list = list->next;
}
return length;
}
static long g_serial_item_serialize(GSerialItem *item, char *buffer,
void *struct_data)
{
char *buf = buffer;
gint32 tmp;
if (item->type >= GSERIAL_LAST_TYPE ||
(item->type > GSERIAL_DOUBLE && item->type < GSERIAL_STRING))
{
g_warning("Error serializing: Unknown serial item type.\n");
return 0;
}
*buf++ = item->type;
if (g_serial_item_is_array(item))
{
tmp = g_serial_item_n_items(item, struct_data);
buf += g_serial_copy_to_n(buf, (char *)&tmp, 4, 1);
buf += g_serial_copy_to_n(buf,
G_STRUCT_MEMBER(char*, struct_data,item->offset),
g_serial_item_data_size(item),
tmp);
}
else
{
buf += g_serial_copy_to_n(buf,
G_STRUCT_MEMBER_P(struct_data, item->offset),
g_serial_item_data_size(item), 1);
}
return (buf - buffer);
}
static long g_serial_item_deserialize(GSerialItem *item, void *struct_data,
char *buffer)
{
char *buf = buffer;
gint32 n_items;
if (*buf != item->type)
{
g_warning("Error deserializing: item types do not match: %d vs %d.\n",
*buf, item->type);
return 0;
}
buf++;
if (g_serial_item_is_array(item))
{
buf += g_serial_copy_from_n((char *)&n_items, buf, 4, 1);
if (item->length < 0)
G_STRUCT_MEMBER(gint32, struct_data, item->length_offset) = n_items;
G_STRUCT_MEMBER(void*, struct_data, item->offset)
= g_malloc(n_items*g_serial_item_data_size(item));
buf += g_serial_copy_from_n(G_STRUCT_MEMBER(void *, struct_data,
item->offset),
buf,
g_serial_item_data_size(item),
n_items);
}
else
{
buf += g_serial_copy_from_n(G_STRUCT_MEMBER_P(struct_data, item->offset),
buf,
g_serial_item_data_size(item),
1);
}
return (buf - buffer);
}
long g_serialize(GSerialDescription *d, void **output, void *struct_data)
{
int length = g_serial_description_compute_length(d, struct_data);
char *outbuf;
GSList *list;
long item_length;
outbuf = (char *)g_malloc(length);
*output = outbuf;
list = d->list;
while (list)
{
item_length = g_serial_item_serialize((GSerialItem *)list->data, outbuf,
struct_data);
if (item_length == 0)
g_error("Error serializing %s\n", d->struct_name);
outbuf += item_length;
list = list->next;
}
return length;
}
long g_deserialize(GSerialDescription *d, void *struct_data, void *serial)
{
GSList *list;
char *in_buf = serial;
char *out_buf = struct_data;
list = d->list;
while (list)
{
in_buf += g_serial_item_deserialize((GSerialItem *)list->data,
out_buf, in_buf);
list = list->next;
}
return (in_buf - (char *)serial);
}