src/uobject.c

   1 /*
   2  *  upkg: tool for manipulating Unreal Tournament packages.
   3  *  Copyright (C) 2009 Nick Bowler
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <assert.h>
  24 #include <glib-object.h>
  25
  26 #include "uobject.h"
  27 #include "upkg.h"
  28 #include "pack.h"
  29
  30 #define U_OBJECT_GET_PRIV(o) \
  31         G_TYPE_INSTANCE_GET_PRIVATE(o, U_OBJECT_TYPE, struct uobject_priv)
  32
  33 enum {
  34         PROPERTY_BYTE = 1,
  35         PROPERTY_INTEGER,
  36         PROPERTY_BOOLEAN,
  37         PROPERTY_FLOAT,
  38         PROPERTY_OBJECT,
  39         PROPERTY_NAME,
  40         PROPERTY_STRING,
  41         PROPERTY_CLASS,
  42         PROPERTY_ARRAY,
  43         PROPERTY_STRUCT,
  44         PROPERTY_VECTOR,
  45         PROPERTY_ROTATOR,
  46         PROPERTY_STR,
  47         PROPERTY_MAP,
  48         PROPERTY_FIXEDARRAY,
  49 };
  50
  51 struct uobject_property {
  52         const char *name;
  53         GValue val;
  54 };
  55
  56 struct uobject_priv {
  57         struct upkg_file *f;
  58         size_t base, len;
  59
  60         unsigned char buf[2048];
  61         unsigned long nbuf;
  62 };
  63
  64 static unsigned long
  65 get_real_size(unsigned long *real, unsigned size, unsigned char *buf, size_t n)
  66 {
  67         assert(size < 8);
  68
  69         *real = 0;
  70         switch (size) {
  71         case 0: *real =  1; return 0;
  72         case 1: *real =  2; return 0;
  73         case 2: *real =  4; return 0;
  74         case 3: *real = 12; return 0;
  75         case 4: *real = 16; return 0;
  76         case 5:
  77                 if (n < 1) return 0;
  78                 *real = *buf;
  79                 return 1;
  80         case 6:
  81                 if (n < 2) return 0;
  82                 *real = unpack_16_le(buf);
  83                 return 2;
  84         case 7:
  85                 if (n < 4) return 0;
  86                 *real = unpack_32_le(buf);
  87                 return 4;
  88         }
  89
  90         return 0;
  91 }
  92
  93 static unsigned long
  94 decode_property(UObject *o, const char *name, struct upkg_file *f, unsigned long len)
  95 {
  96         struct uobject_priv *priv = U_OBJECT_GET_PRIV(o);
  97         unsigned long real_size, rc;
  98         int type, size, top;
  99         GValue val = {0};
 100
 101         if (priv->nbuf-len < 1)
 102                 return 0;
 103
 104         type = (priv->buf[len] >> 0) & 0x0f;
 105         size = (priv->buf[len] >> 4) & 0x07;
 106         top  = (priv->buf[len] >> 7) & 0x01;
 107         len += 1;
 108
 109         rc = get_real_size(&real_size, size, priv->buf, priv->nbuf-len);
 110         if (real_size == 0)
 111                 return 0;
 112         len += rc;
 113
 114         switch (type) {
 115         case PROPERTY_BYTE:
 116                 if (priv->nbuf-len < 1)
 117                         return 0;
 118                 g_value_init(&val, G_TYPE_UCHAR);
 119                 g_value_set_uchar(&val, priv->buf[len]);
 120                 g_object_set_property(G_OBJECT(o), name, &val);
 121                 break;
 122         case PROPERTY_INTEGER:
 123                 if (priv->nbuf-len < 4)
 124                         return 0;
 125                 g_value_init(&val, G_TYPE_ULONG);
 126                 g_value_set_ulong(&val, unpack_32_le(priv->buf+len));
 127                 g_object_set_property(G_OBJECT(o), name, &val);
 128                 break;
 129         default:
 130                 fprintf(stderr, "Unhandled property type %x\n", (unsigned)type);
 131         }
 132
 133         real_size += len;
 134         if (real_size + len <= priv->nbuf) {
 135                 priv->nbuf -= real_size;
 136                 memmove(priv->buf, priv->buf+real_size, priv->nbuf);
 137         } else {
 138                 long skip = real_size - priv->nbuf;
 139                 if (upkg_export_seek(f, skip, SEEK_CUR) != 0)
 140                         return 0;
 141                 priv->nbuf = 0;
 142         }
 143
 144         return real_size;
 145 }
 146
 147 /* Deserialize properties from an Unreal package. */
 148 static int deserialize(UObject *o, struct upkg_file *f)
 149 {
 150         struct uobject_priv *priv = U_OBJECT_GET_PRIV(o);
 151         unsigned long rc, tot_len = 0;
 152
 153         while (1) {
 154                 unsigned long len = 0;
 155                 const char *name;
 156                 long tmp;
 157
 158                 /* Read some data into buffer. */
 159                 if (!f->eof) {
 160                         void  *buf = priv->buf + priv->nbuf;
 161                         size_t amt = sizeof priv->buf - priv->nbuf;
 162                         rc = upkg_export_read(f, buf, amt);
 163                         if (rc == 0)
 164                                 return -1;
 165                         priv->nbuf += rc;
 166                 }
 167
 168                 /* Get the property name. */
 169                 rc = upkg_decode_index(&tmp, priv->buf+len, priv->nbuf-len);
 170                 if (rc == 0)
 171                         return -1;
 172                 len = rc;
 173
 174                 name = upkg_get_name(f->pkg, tmp);
 175                 if (!name) {
 176                         return -1;
 177                 } else if (strcmp(name, "None") == 0) {
 178                         tot_len += len;
 179                         break;
 180                 }
 181
 182                 rc = decode_property(U_OBJECT(o), name, f, len);
 183                 if (rc == 0)
 184                         return -1;
 185                 len = rc;
 186
 187                 tot_len += len;
 188         }
 189
 190         f->base += tot_len;
 191         f->len  -= tot_len;
 192         upkg_export_seek(f, 0, SEEK_SET);
 193
 194         return 0;
 195 }
 196
 197 int u_object_deserialize(GObject *obj, struct upkg_file *f)
 198 {
 199         g_return_val_if_fail(IS_U_OBJECT(obj), -1);
 200         return U_OBJECT_GET_CLASS(obj)->deserialize(U_OBJECT(obj), f);
 201 }
 202
 203 static void u_object_init(UObject *o)
 204 {
 205         struct uobject_priv *priv = U_OBJECT_GET_PRIV(o);
 206 }
 207
 208 static void u_object_class_init(UObjectClass *class)
 209 {
 210         g_type_class_add_private(class, sizeof (struct uobject_priv));
 211
 212         class->deserialize = deserialize;
 213 }
 214
 215 G_DEFINE_TYPE(UObject, u_object, G_TYPE_OBJECT);