src/uobject/uobject.c

   1 /*
   2  *  upkg: tool for manipulating Unreal Tournament packages.
   3  *  Copyright © 2009-2011 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 3 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, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <assert.h>
  23 #include <glib-object.h>
  24
  25 #include <uobject/uobject.h>
  26 #include <uobject/module.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 u_object_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 u_object_priv {
  52         struct upkg_file *f;
  53         size_t base, len;
  54
  55         unsigned char buf[2048];
  56         unsigned long nbuf;
  57 };
  58
  59 G_DEFINE_TYPE(UObject, u_object, G_TYPE_OBJECT);
  60
  61 static unsigned long
  62 get_real_size(unsigned long *real, unsigned size, unsigned char *buf, size_t n)
  63 {
  64         assert(size < 8);
  65
  66         *real = 0;
  67         switch (size) {
  68         case 0: *real =  1; return 0;
  69         case 1: *real =  2; return 0;
  70         case 2: *real =  4; return 0;
  71         case 3: *real = 12; return 0;
  72         case 4: *real = 16; return 0;
  73         case 5:
  74                 if (n < 1) return 0;
  75                 *real = *buf;
  76                 return 1;
  77         case 6:
  78                 if (n < 2) return 0;
  79                 *real = unpack_16_le(buf);
  80                 return 2;
  81         case 7:
  82                 if (n < 4) return 0;
  83                 *real = unpack_32_le(buf);
  84                 return 4;
  85         }
  86
  87         return 0;
  88 }
  89
  90 static unsigned long
  91 decode_property(UObject *o, const char *name, struct upkg_file *f, unsigned long len)
  92 {
  93         struct u_object_priv *priv = U_OBJECT_GET_PRIV(o);
  94         unsigned long real_size, rc;
  95         int type, size, top;
  96         GValue val = {0};
  97
  98         if (priv->nbuf-len < 1)
  99                 return 0;
 100
 101         type = (priv->buf[len] >> 0) & 0x0f;
 102         size = (priv->buf[len] >> 4) & 0x07;
 103         top  = (priv->buf[len] >> 7) & 0x01;
 104         len += 1;
 105
 106         rc = get_real_size(&real_size, size, priv->buf, priv->nbuf-len);
 107         if (real_size == 0)
 108                 return 0;
 109         len += rc;
 110
 111         switch (type) {
 112         case PROPERTY_BYTE:
 113                 if (priv->nbuf-len < 1)
 114                         return 0;
 115                 g_value_init(&val, G_TYPE_UCHAR);
 116                 g_value_set_uchar(&val, priv->buf[len]);
 117                 g_object_set_property(G_OBJECT(o), name, &val);
 118                 break;
 119         case PROPERTY_INTEGER:
 120                 if (priv->nbuf-len < 4)
 121                         return 0;
 122                 g_value_init(&val, G_TYPE_ULONG);
 123                 g_value_set_ulong(&val, unpack_32_le(priv->buf+len));
 124                 g_object_set_property(G_OBJECT(o), name, &val);
 125                 break;
 126         default:
 127                 fprintf(stderr, "Unhandled property type %x\n", (unsigned)type);
 128         }
 129
 130         real_size += len;
 131         if (real_size + len <= priv->nbuf) {
 132                 priv->nbuf -= real_size;
 133                 memmove(priv->buf, priv->buf+real_size, priv->nbuf);
 134         } else {
 135                 long skip = real_size - priv->nbuf;
 136                 if (upkg_export_seek(f, skip, SEEK_CUR) != 0)
 137                         return 0;
 138                 priv->nbuf = 0;
 139         }
 140
 141         return real_size;
 142 }
 143
 144 /* Deserialize properties from an Unreal package. */
 145 static int deserialize(UObject *uo)
 146 {
 147         struct u_object_priv *priv = U_OBJECT_GET_PRIV(uo);
 148         struct upkg_file *f = uo->pkg_file;
 149         unsigned long rc, tot_len = 0;
 150
 151         while (1) {
 152                 unsigned long len = 0;
 153                 const char *name;
 154                 long tmp;
 155
 156                 /* Read some data into buffer. */
 157                 if (!f->eof) {
 158                         void  *buf = priv->buf + priv->nbuf;
 159                         size_t amt = sizeof priv->buf - priv->nbuf;
 160                         rc = upkg_export_read(f, buf, amt);
 161                         if (rc == 0 && priv->nbuf == 0)
 162                                 return -1;
 163                         priv->nbuf += rc;
 164                 }
 165
 166                 /* Get the property name. */
 167                 rc = upkg_decode_index(&tmp, priv->buf+len, priv->nbuf-len);
 168                 if (rc == 0)
 169                         return -1;
 170                 len = rc;
 171
 172                 name = upkg_get_name(uo->pkg, tmp);
 173                 if (!name) {
 174                         return -1;
 175                 } else if (strcmp(name, "None") == 0) {
 176                         tot_len += len;
 177                         break;
 178                 }
 179
 180                 rc = decode_property(uo, name, f, len);
 181                 if (rc == 0)
 182                         return -1;
 183                 len = rc;
 184
 185                 tot_len += len;
 186         }
 187
 188         f->base += tot_len;
 189         f->len  -= tot_len;
 190         upkg_export_seek(f, 0, SEEK_SET);
 191
 192         return 0;
 193 }
 194
 195 int u_object_deserialize(GObject *obj, struct upkg *pkg, unsigned long idx)
 196 {
 197         g_return_val_if_fail(IS_U_OBJECT(obj), -1);
 198         UObject *uo = U_OBJECT(obj);
 199         struct upkg_file *f;
 200         int rc;
 201
 202         g_return_val_if_fail(uo->pkg_file == NULL, -1);
 203         f = upkg_export_open(pkg, idx);
 204         if (!f) {
 205                 return -1;
 206         }
 207
 208         uo->pkg      = pkg;
 209         uo->pkg_file = f;
 210
 211         rc = U_OBJECT_GET_CLASS(obj)->deserialize(uo);
 212         if (rc != 0) {
 213                 upkg_export_close(f);
 214                 uo->pkg_file = NULL;
 215         }
 216
 217         return rc;
 218 }
 219
 220 GObject *u_object_new_from_package(struct upkg *upkg, unsigned long idx)
 221 {
 222         const struct upkg_export *export;
 223         const char *class, *package;
 224         GObject *obj = NULL;
 225         GType type;
 226
 227         class = upkg_export_class(upkg, idx, &package);
 228
 229         type = u_object_module_get_class(package, class);
 230         if (type) {
 231                 obj = g_object_new(type, NULL);
 232                 if (u_object_deserialize(obj, upkg, idx) != 0) {
 233                         g_object_unref(obj);
 234                         return NULL;
 235                 }
 236         }
 237
 238         return obj;
 239 }
 240
 241 static void u_object_init(UObject *o)
 242 {
 243         o->pkg      = NULL;
 244         o->pkg_file = NULL;
 245 }
 246
 247 static void u_object_finalize(GObject *o)
 248 {
 249         UObject *uo = U_OBJECT(o);
 250
 251         if (uo->pkg_file) {
 252                 upkg_export_close(uo->pkg_file);
 253         }
 254
 255         G_OBJECT_CLASS(u_object_parent_class)->finalize(o);
 256 }
 257
 258 static void u_object_class_init(UObjectClass *class)
 259 {
 260         g_type_class_add_private(class, sizeof (struct u_object_priv));
 261         GObjectClass *go = G_OBJECT_CLASS(class);
 262
 263         class->deserialize = deserialize;
 264         go->finalize       = u_object_finalize;
 265 }