Add ruby-dl

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@2324 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1075 insertions, 0 deletions

diff --git a/ext/dl/ptr.c b/ext/dl/ptr.c
new file mode 100644
index 0000000000..6ac214bc46
--- /dev/null
+++ b/ext/dl/ptr.c
@@ -0,0 +1,1075 @@
+/* -*- C -*-
+ * $Id$
+ */
+
+#include <ruby.h>
+#include <version.h> /* for ruby version code */
+#include "dl.h"
+
+VALUE rb_cDLPtrData;
+VALUE rb_mDLMemorySpace;
+static VALUE DLMemoryTable;
+
+#ifndef T_SYMBOL
+# define T_SYMBOL T_FIXNUM
+#endif
+
+#if RUBY_VERSION_CODE < 171
+static VALUE
+rb_hash_delete(VALUE hash, VALUE key)
+{
+  return rb_funcall(hash, rb_intern("delete"), 1, key);
+}
+#endif
+
+static void
+rb_dlmem_delete(void *ptr)
+{
+  rb_hash_delete(DLMemoryTable, DLLONG2NUM(ptr));
+};
+
+static void
+rb_dlmem_aset(void *ptr, VALUE obj)
+{
+  if( obj == Qnil ){
+    rb_dlmem_delete(ptr);
+  }
+  else{
+    rb_hash_aset(DLMemoryTable, DLLONG2NUM(ptr), DLLONG2NUM(obj));
+  };
+};
+
+static VALUE
+rb_dlmem_aref(void *ptr)
+{
+  VALUE val;
+
+  val = rb_hash_aref(DLMemoryTable, DLLONG2NUM(ptr));
+  return val == Qnil ? Qnil : (VALUE)DLNUM2LONG(val);
+};
+
+void
+dlptr_free(struct ptr_data *data)
+{
+  if( data->ptr ){
+    DEBUG_CODE({
+      printf("dlptr_free(): removing the pointer `0x%x' from the MemorySpace\n",
+	     data->ptr);
+    });
+    rb_dlmem_delete(data->ptr);
+    if( data->free ){
+      DEBUG_CODE({
+	printf("dlptr_free(): 0x%x(data->ptr:0x%x)\n",data->free,data->ptr);
+      });
+      (*(data->free))(data->ptr);
+    };
+  };
+  if( data->stype ) dlfree(data->stype);
+  if( data->ssize ) dlfree(data->ssize);
+  if( data->ids  ) dlfree(data->ids);
+};
+
+void
+dlptr_init(VALUE val)
+{
+  struct ptr_data *data;
+
+  Data_Get_Struct(val, struct ptr_data, data);
+  DEBUG_CODE({
+    printf("dlptr_init(): add the pointer `0x%x' to the MemorySpace\n",
+	   data->ptr);
+  });
+  rb_dlmem_aset(data->ptr, val);
+};
+
+VALUE
+rb_dlptr_new(void *ptr, long size, freefunc_t func)
+{
+  struct ptr_data *data;
+  VALUE val;
+
+  if( ptr ){
+    val = rb_dlmem_aref(ptr);
+    if( val == Qnil ){
+      val = Data_Make_Struct(rb_cDLPtrData, struct ptr_data,
+			     0, dlptr_free, data);
+      data->ptr = ptr;
+      data->free = func;
+      data->ctype = DLPTR_CTYPE_UNKNOWN;
+      data->stype = NULL;
+      data->ssize = NULL;
+      data->slen = 0;
+      data->size = size;
+      data->ids = NULL;
+      data->ids_num = 0;
+      dlptr_init(val);
+    }
+    else{
+      if( func ){
+	Data_Get_Struct(val, struct ptr_data, data);
+	data->free = func;
+      };
+    };
+  }
+  else{
+    val = Qnil;
+  };
+
+  return val;
+};
+
+VALUE
+rb_dlptr_alloc(long size, freefunc_t func)
+{
+  return rb_dlptr_new(dlmalloc((size_t)size), size, func);
+};
+
+void *
+rb_dlptr2cptr(VALUE val)
+{
+  struct ptr_data *data;
+  void *ptr;
+
+  if( rb_obj_is_kind_of(val, rb_cDLPtrData) ){
+    Data_Get_Struct(val, struct ptr_data, data);
+    ptr = data->ptr;
+  }
+  else if( val == Qnil ){
+    ptr = NULL;
+  }
+  else{
+    rb_raise(rb_eTypeError, "DL::PtrData was expected");
+  };
+    
+  return ptr;
+};
+
+static VALUE
+rb_dlptr_s_new(int argc, VALUE argv[], VALUE klass)
+{
+  VALUE ptr, sym, obj, size;
+  void *p = NULL;
+  void  (*f)() = NULL;
+  long s = 0;
+
+  switch( rb_scan_args(argc, argv, "12", &ptr, &size, &sym) ){
+  case 1:
+    p = (void*)(DLNUM2LONG(rb_Integer(ptr)));
+    break;
+  case 2:
+    p = (void*)(DLNUM2LONG(rb_Integer(ptr)));
+    s = DLNUM2LONG(size);
+    break;
+  case 3:
+    p = (void*)(DLNUM2LONG(rb_Integer(ptr)));
+    s = DLNUM2LONG(size);
+    f = rb_dlsym2csym(sym);
+    break;
+  default:
+    rb_bug("rb_dlptr_s_new");
+  };
+
+  obj = rb_dlptr_new(p,s,f);
+
+  rb_obj_call_init(obj, argc, argv);
+
+  return obj;
+};
+
+static VALUE
+rb_dlptr_s_alloc(int argc, VALUE argv[], VALUE klass)
+{
+  VALUE size, sym, obj;
+  int   s;
+  void  (*f)() = NULL;
+
+  switch( rb_scan_args(argc, argv, "11", &size, &sym) ){
+  case 1:
+    s = NUM2INT(size);
+    break;
+  case 2:
+    s = NUM2INT(size);
+    f = rb_dlsym2csym(sym);
+    break;
+  default:
+    rb_bug("rb_dlptr_s_new");
+  };
+
+  obj = rb_dlptr_alloc(s,f);
+
+  rb_obj_call_init(obj, argc, argv);
+
+  return obj;
+};
+
+static VALUE
+rb_dlptr_init(int argc, VALUE argv[], VALUE self)
+{
+  return Qnil;
+};
+
+static VALUE
+rb_dlptr_cast(int argc, VALUE argv[], VALUE self)
+{
+  VALUE klass, rest, val, *pass_argv;
+  int pass_argc, i;
+  struct ptr_data *data;
+
+  Data_Get_Struct(self, struct ptr_data, data);
+  rb_scan_args(argc, argv, "1*", &klass, &rest);
+
+  /* prepare the arguments of `new' method */
+  pass_argc = argc + 1;
+  pass_argv = ALLOCA_N(VALUE, pass_argc);
+  pass_argv[0] = DLLONG2NUM(data->ptr);
+  pass_argv[1] = rb_dlsym_new(data->free, NULL, NULL);
+  for( i=2; i < pass_argc; i++ ){
+    pass_argv[i] = rb_ary_entry(rest,i-2);
+  };
+
+  /* remove the data */
+  ((struct ptr_data *)(RDATA(self)->data))->ptr = 0;
+  (RDATA(self)->dfree)(RDATA(self)->data);
+  
+  /* call the `new' method of klass with prepared arguments */
+  val = rb_funcall2(klass, rb_intern("new"), pass_argc, pass_argv);
+
+  RDATA(self)->basic.klass = RDATA(val)->basic.klass;
+  RDATA(self)->basic.flags = RDATA(val)->basic.flags;
+  RDATA(self)->dmark = RDATA(val)->dmark;
+  RDATA(self)->dfree = RDATA(val)->dfree;
+  RDATA(self)->data = RDATA(val)->data;
+
+  RDATA(val)->dmark = 0;
+  RDATA(val)->dfree = 0;
+
+  return Qnil;
+};
+
+VALUE
+rb_dlptr_to_i(VALUE self)
+{
+  struct ptr_data *data;
+
+  Data_Get_Struct(self, struct ptr_data, data);
+  return DLLONG2NUM(data->ptr);
+};
+
+VALUE
+rb_dlptr_ptr(VALUE self)
+{
+  struct ptr_data *data;
+
+  Data_Get_Struct(self, struct ptr_data, data);
+  return rb_dlptr_new(*((void**)(data->ptr)),0,0);
+};
+
+VALUE
+rb_dlptr_ref(VALUE self)
+{
+  struct ptr_data *data;
+
+  Data_Get_Struct(self, struct ptr_data, data);
+  return rb_dlptr_new(&(data->ptr),0,0);
+};
+
+VALUE
+rb_dlptr_null_p(VALUE self)
+{
+  struct ptr_data *data;
+
+  Data_Get_Struct(self, struct ptr_data, data);
+  return data->ptr ? Qfalse : Qtrue;
+};
+
+VALUE
+rb_dlptr_free_set(VALUE self, VALUE val)
+{
+  struct ptr_data *data;
+  int i;
+
+  Data_Get_Struct(self, struct ptr_data, data);
+
+  data->free = DLFREEFUNC(rb_dlsym2csym(val));
+
+  return Qnil;
+};
+
+VALUE
+rb_dlptr_free_get(VALUE self)
+{
+  struct ptr_data *pdata;
+
+  Data_Get_Struct(self, struct ptr_data, pdata);
+
+  return rb_dlsym_new(pdata->free,"(free)","0P");
+};
+
+VALUE
+rb_dlptr_to_array(int argc, VALUE argv[], VALUE self)
+{
+  struct ptr_data *data;
+  int n;
+  int i;
+  int t;
+  VALUE ary;
+  VALUE type, size;
+
+  Data_Get_Struct(self, struct ptr_data, data);
+
+  switch( rb_scan_args(argc, argv, "11", &type, &size) ){
+  case 2:
+    t = STR2CSTR(type)[0];
+    n = NUM2INT(size);
+    break;
+  case 1:
+    t = STR2CSTR(type)[0];
+    switch( t ){
+    case 'C':
+      n = data->size;
+      break;
+    case 'H':
+      n = data->size / sizeof(short);
+      break;
+    case 'I':
+      n = data->size / sizeof(int);
+      break;
+    case 'L':
+      n = data->size / sizeof(long);
+      break;
+    case 'F':
+      n = data->size / sizeof(float);
+      break;
+    case 'D':
+      n = data->size / sizeof(double);
+      break;
+    case  'S': case 'P':
+      n = data->size / sizeof(void*);
+      break;
+    default:
+      if( t == 'p' || t == 's' ){
+	int i;
+	for( i=0; ((void**)(data->ptr))[i]; i++ ){};
+	n = i;
+      }
+      else{
+	n = 0;
+      };
+    };
+    break;
+  default:
+    rb_bug("rb_dlptr_to_array");
+  };
+
+  ary = rb_ary_new();
+
+  for( i=0; i < n; i++ ){
+    switch( t ){
+    case 'C':
+      rb_ary_push(ary, INT2NUM(((char*)(data->ptr))[i]));
+      break;
+    case 'H':
+      rb_ary_push(ary, INT2NUM(((short*)(data->ptr))[i]));
+      break;
+    case 'I':
+      rb_ary_push(ary, INT2NUM(((int*)(data->ptr))[i]));
+      break;
+    case 'L':
+      rb_ary_push(ary, DLLONG2NUM(((long*)(data->ptr))[i]));
+      break;
+    case 'D':
+      rb_ary_push(ary, rb_float_new(((double*)(data->ptr))[i]));
+    case 'F':
+      rb_ary_push(ary, rb_float_new(((float*)(data->ptr))[i]));
+      break;
+    case 'S':
+      {
+	char *str = ((char**)(data->ptr))[i];
+	if( str ){
+	  rb_ary_push(ary, rb_tainted_str_new2(str));
+	}
+	else{
+	  rb_ary_push(ary, Qnil);
+	};
+      };
+      break;
+    case 's':
+      {
+	char *str = ((char**)(data->ptr))[i];
+	if( str ){
+	  rb_ary_push(ary, rb_tainted_str_new2(str));
+	  xfree(str);
+	}
+	else{
+	  rb_ary_push(ary, Qnil);
+	};
+      };
+      break;
+    case 'P':
+      rb_ary_push(ary, rb_dlptr_new(((void**)(data->ptr))[i],0,0));
+      break;
+    case 'p':
+      rb_ary_push(ary,
+		  rb_dlptr_new(((void**)(data->ptr))[i],0,dlfree));
+      break;
+    };
+  };
+
+  return ary;
+};
+
+
+VALUE
+rb_dlptr_to_s(int argc, VALUE argv[], VALUE self)
+{
+  struct ptr_data *data;
+  VALUE arg1, val;
+  int len;
+
+  Data_Get_Struct(self, struct ptr_data, data);
+  switch( rb_scan_args(argc, argv, "01", &arg1) ){
+  case 0:
+    val = rb_tainted_str_new2((char*)(data->ptr));
+    break;
+  case 1:
+    len = NUM2INT(arg1);
+    val = rb_tainted_str_new((char*)(data->ptr), len);
+    break;
+  default:
+    rb_bug("rb_dlptr_to_s");
+  };
+
+  return val;
+};
+
+VALUE
+rb_dlptr_to_str(int argc, VALUE argv[], VALUE self)
+{
+  struct ptr_data *data;
+  VALUE arg1, val;
+  int len;
+
+  Data_Get_Struct(self, struct ptr_data, data);
+  switch( rb_scan_args(argc, argv, "01", &arg1) ){
+  case 0:
+    val = rb_tainted_str_new((char*)(data->ptr),data->size);
+    break;
+  case 1:
+    len = NUM2INT(arg1);
+    val = rb_tainted_str_new((char*)(data->ptr), len);
+    break;
+  default:
+    rb_bug("rb_dlptr_to_str");
+  };
+
+  return val;
+};
+
+VALUE
+rb_dlptr_inspect(VALUE self)
+{
+  struct ptr_data *data;
+  char str[1024];
+  VALUE name;
+
+  Data_Get_Struct(self, struct ptr_data, data);
+  snprintf(str, 1023, "#<%s:0x%x ptr=0x%x size=%ld free=0x%x>",
+	   rb_class2name(CLASS_OF(self)), data, data->ptr, data->size, data->free);
+  return rb_str_new2(str);
+};
+
+VALUE
+rb_dlptr_eql(VALUE self, VALUE other)
+{
+  void *ptr1, *ptr2;
+  ptr1 = rb_dlptr2cptr(self);
+  ptr2 = rb_dlptr2cptr(other);
+
+  return ptr1 == ptr2 ? Qtrue : Qfalse;
+};
+
+VALUE
+rb_dlptr_cmp(VALUE self, VALUE other)
+{
+  void *ptr1, *ptr2;
+  ptr1 = rb_dlptr2cptr(self);
+  ptr2 = rb_dlptr2cptr(other);
+  return DLLONG2NUM((long)ptr1 - (long)ptr2);
+};
+
+VALUE
+rb_dlptr_plus(VALUE self, VALUE other)
+{
+  void *ptr;
+  long num, size;
+
+  ptr = rb_dlptr2cptr(self);
+  size = RDLPTR(self)->size;
+  num = DLNUM2LONG(other);
+  return rb_dlptr_new((void*)(ptr + num), size - num, 0);
+};
+
+VALUE
+rb_dlptr_minus(VALUE self, VALUE other)
+{
+  void *ptr;
+  long num, size;
+
+  ptr = rb_dlptr2cptr(self);
+  size = RDLPTR(self)->size;
+  num = DLNUM2LONG(other);
+  return rb_dlptr_new((void*)(ptr - num), size + num, 0);
+};
+
+VALUE
+rb_dlptr_define_data_type(int argc, VALUE argv[], VALUE self)
+{
+  VALUE data_type, type, rest, vid;
+  struct ptr_data *data;
+  int i, t, len, num;
+  char *ctype;
+  long size;
+
+  rb_scan_args(argc, argv, "11*", &data_type, &type, &rest);
+  Data_Get_Struct(self, struct ptr_data, data);
+
+  if( argc == 1 || (argc == 2 && type == Qnil) ){
+    if( NUM2INT(data_type) == DLPTR_CTYPE_UNKNOWN ){
+      data->ctype = DLPTR_CTYPE_UNKNOWN;
+      data->slen = 0;
+      data->ids_num  = 0;
+      if( data->stype ){
+	dlfree(data->stype);
+	data->stype = NULL;
+      };
+      if( data->ids ){
+	dlfree(data->ids);
+	data->ids = NULL;
+      };
+      return Qnil;
+    }
+    else{
+      raise(rb_eArgError, "wrong arguments");
+    };
+  };
+
+  Check_Type(data_type, T_FIXNUM);
+  Check_Type(type, T_STRING);
+  Check_Type(rest, T_ARRAY);
+  t = FIX2INT(data_type);
+  num = RARRAY(rest)->len;
+  for( i=0; i<num; i++ ){
+    vid = rb_ary_entry(rest,i);
+    if( !(TYPE(vid)==T_STRING || TYPE(vid)==T_SYMBOL) ){
+      rb_raise(rb_eTypeError, "#%d must be a string or symbol", i + 2);
+    };
+  };
+
+  data->ctype = t;
+  data->slen = num;
+  data->ids_num  = num;
+  if( data->stype ) dlfree(data->stype);
+  data->stype = (char*)dlmalloc(sizeof(char) * num);
+  if( data->ssize ) dlfree(data->ssize);
+  data->ssize = (int*)dlmalloc(sizeof(int) * num);
+  if( data->ids ) dlfree(data->ids);
+  data->ids  = (ID*)dlmalloc(sizeof(ID) * data->ids_num);
+
+  ctype = STR2CSTR(type);
+  for( i=0; i<num; i++ ){
+    vid = rb_ary_entry(rest,i);
+    data->ids[i] = rb_to_id(vid);
+    data->stype[i] = *ctype;
+    ctype ++;
+    if( isdigit(*ctype) ){
+      char *p, *d;
+      for( p=ctype; isdigit(*p); p++ ) ;
+      d = ALLOCA_N(char, p - ctype + 1);
+      strncpy(d, ctype, p - ctype);
+      d[p - ctype] = '\0';
+      data->ssize[i] = atoi(d);
+      ctype = p;
+    }
+    else{
+      data->ssize[i] = 1;
+    };
+  };
+
+  if( *ctype ){
+    rb_raise(rb_eArgError, "too few/many arguments");
+  };
+
+  if( !data->size )
+    data->size = dlsizeof(STR2CSTR(type));
+
+  return Qnil;
+};
+
+VALUE
+rb_dlptr_define_struct(int argc, VALUE argv[], VALUE self)
+{
+  VALUE *pass_argv;
+  int pass_argc, i;
+
+  pass_argc = argc + 1;
+  pass_argv = ALLOCA_N(VALUE, pass_argc);
+  pass_argv[0] = INT2FIX(DLPTR_CTYPE_STRUCT);
+  for( i=1; i<pass_argc; i++ ){
+    pass_argv[i] = argv[i-1];
+  };
+  return rb_dlptr_define_data_type(pass_argc, pass_argv, self);
+};
+
+VALUE
+rb_dlptr_define_union(int argc, VALUE argv[], VALUE self)
+{
+  VALUE *pass_argv;
+  int pass_argc, i;
+
+  pass_argc = argc + 1;
+  pass_argv = ALLOCA_N(VALUE, pass_argc);
+  pass_argv[0] = INT2FIX(DLPTR_CTYPE_UNION);
+  for( i=1; i<pass_argc; i++ ){
+    pass_argv[i] = argv[i-1];
+  };
+  return rb_dlptr_define_data_type(pass_argc, pass_argv, self);
+};
+
+VALUE
+rb_dlptr_get_data_type(VALUE self)
+{
+  struct ptr_data *data;
+
+  Data_Get_Struct(self, struct ptr_data, data);
+  if( data->stype )
+    return rb_assoc_new(INT2FIX(data->ctype),
+			rb_tainted_str_new(data->stype, data->slen));
+  else
+    return rb_assoc_new(INT2FIX(data->ctype), Qnil);
+};
+
+static VALUE
+cary2ary(void *ptr, char t, int len)
+{
+  VALUE ary;
+  VALUE elem;
+  int i;
+
+  if( len < 1 )
+    return Qnil;
+
+  if( len == 1 ){
+    switch( t ){
+    case 'I': case 'i':
+      elem = INT2NUM(*((int*)ptr));
+      ptr += sizeof(int);
+      break;
+    case 'L': case 'l':
+      elem = DLLONG2NUM(*((long*)ptr));
+      ptr += sizeof(long);
+      break;
+    case 'P': case 'p':
+      elem = rb_dlptr_new(*((void**)ptr),0, 0);
+      ptr += sizeof(void*);
+      break;
+    case 'F': case 'f':
+      elem = rb_float_new(*((float*)ptr));
+      ptr += sizeof(float);
+      break;
+    case 'D': case 'd':
+      elem = rb_float_new(*((float*)ptr));
+      ptr += sizeof(double);
+      break;
+    case 'C': case 'c':
+      elem = INT2NUM(*((char*)ptr));
+      ptr += sizeof(char);
+      break;
+    case 'H': case 'h':
+      elem = INT2NUM(*((short*)ptr));
+      ptr += sizeof(short);
+    default:
+      raise(rb_eDLTypeError, "unsupported type '%c'", t);
+    };
+    return elem;
+  };
+
+  ary = rb_ary_new();
+  for( i=0; i < len; i++ ){
+    switch( t ){
+    case 'I': case 'i':
+      elem = INT2NUM(*((int*)ptr));
+      ptr += sizeof(int);
+      break;
+    case 'L': case 'l':
+      elem = DLLONG2NUM(*((long*)ptr));
+      ptr += sizeof(long);
+      break;
+    case 'P': case 'p':
+      elem = rb_dlptr_new(*((void**)ptr), 0, 0);
+      ptr += sizeof(void*);
+      break;
+    case 'F': case 'f':
+      elem = rb_float_new(*((float*)ptr));
+      ptr += sizeof(float);
+      break;
+    case 'D': case 'd':
+      elem = rb_float_new(*((float*)ptr));
+      ptr += sizeof(double);
+      break;
+    case 'C': case 'c':
+      elem = INT2NUM(*((char*)ptr));
+      ptr += sizeof(char);
+      break;
+    case 'H': case 'h':
+      elem = INT2NUM(*((short*)ptr));
+      ptr += sizeof(short);
+    default:
+      raise(rb_eDLTypeError, "unsupported type '%c'", t);
+    };
+    rb_ary_push(ary, elem);
+  };
+
+  return ary;
+};
+
+VALUE
+rb_dlptr_aref(int argc, VALUE argv[], VALUE self)
+{
+  VALUE val, key = Qnil, num = Qnil;
+  ID id;
+  int idx;
+  struct ptr_data *data;
+  int i;
+  int offset;
+
+  if( rb_scan_args(argc, argv, "11", &key, &num) == 1 ){
+    num = INT2NUM(0);
+  };
+
+  if( TYPE(key) == T_FIXNUM || TYPE(key) == T_BIGNUM ){
+    VALUE pass[] = {num};
+    return rb_dlptr_to_str(1, pass, rb_dlptr_plus(self, key));
+  };
+
+  if( ! (TYPE(key) == T_STRING || TYPE(key) == T_SYMBOL ) ){
+    rb_raise(rb_eTypeError, "the key must be a string or symbol");
+  };
+
+  id = rb_to_id(key);
+  Data_Get_Struct(self, struct ptr_data, data);
+  switch( data->ctype ){
+  case DLPTR_CTYPE_STRUCT:
+    offset = 0;
+    for( i=0; i < data->ids_num; i++ ){
+      if( data->ids[i] == id ){
+	switch( data->stype[i] ){
+	case 'I':
+	  DLALIGN(data->ptr,offset,INT_ALIGN);
+	  break;
+	case 'L':
+	  DLALIGN(data->ptr,offset,LONG_ALIGN);
+	  break;
+	case 'P':
+	  DLALIGN(data->ptr,offset,VOIDP_ALIGN);
+	case 'F':
+	  DLALIGN(data->ptr,offset,FLOAT_ALIGN);
+	  break;
+	case 'D':
+	  DLALIGN(data->ptr,offset,DOUBLE_ALIGN);
+	  break;
+	case 'C':
+	  break;
+	case 'H':
+	  DLALIGN(data->ptr,offset,SHORT_ALIGN);
+	  break;
+	default:
+	  raise(rb_eDLTypeError, "unsupported type '%c'", data->stype[i]);
+	};
+	return cary2ary(data->ptr + offset, data->stype[i], data->ssize[i]);
+      };
+      switch( data->stype[i] ){
+      case 'I':
+      case 'i':
+	offset += sizeof(int) * data->ssize[i];
+	break;
+      case 'L':
+      case 'l':
+	offset += sizeof(long) * data->ssize[i];
+	break;
+      case 'P':
+      case 'p':
+	offset += sizeof(void*) * data->ssize[i];
+	break;
+      case 'F':
+      case 'f':
+	offset += sizeof(float) * data->ssize[i];
+	break;
+      case 'D':
+      case 'd':
+	offset += sizeof(double) * data->ssize[i];
+	break;
+      case 'C':
+      case 'c':
+	offset += sizeof(char) * data->ssize[i];
+	break;
+      case 'H':
+      case 'h':
+	offset += sizeof(short) * data->ssize[i];
+	break;
+      default:
+	raise(rb_eDLTypeError, "unsupported type '%c'", data->stype[i]);
+      };
+    };
+    break;
+  case DLPTR_CTYPE_UNION:
+    for( i=0; i < data->ids_num; i++ ){
+      if( data->ids[i] == id ){
+	return cary2ary(data->ptr + offset, data->stype[i], data->ssize[i]);
+      };
+    };
+    break;
+  }; /* end of switch */
+
+  rb_raise(rb_eNameError, "undefined key `%s' for %s",
+	   rb_id2name(id), rb_class2name(CLASS_OF(self)));
+
+  return Qnil;
+};
+
+static void *
+ary2cary(char t, VALUE val, long *size)
+{
+  void *ptr;
+
+  if( TYPE(val) == T_ARRAY ){
+    ptr = rb_ary2cary(t, val, size);
+  }
+  else{
+    ptr = rb_ary2cary(t, rb_ary_new3(1, val), size);
+  };
+  return ptr;
+};
+
+VALUE
+rb_dlptr_aset(int argc, VALUE argv[], VALUE self)
+{
+  VALUE key = Qnil, num = Qnil, val = Qnil;
+  ID id;
+  struct ptr_data *data;
+  int i;
+  int offset;
+  long memsize;
+  void *memimg;
+
+  switch( rb_scan_args(argc, argv, "21", &key, &num, &val) ){
+  case 2:
+    val = num;
+    num = Qnil;
+    break;
+  };
+
+  if( TYPE(key) == T_FIXNUM || TYPE(key) == T_BIGNUM ){
+    void *dst, *src;
+    int len;
+    
+    Check_Type(val, T_STRING);
+    Data_Get_Struct(self, struct ptr_data, data);
+    dst = (void*)((long)(data->ptr) + DLNUM2LONG(key));
+    src = STR2CSTR(val);
+    if( num == Qnil ){
+      len = RSTRING(val)->len;
+    }
+    else{
+      len = NUM2INT(num);
+    };
+    memcpy(dst, src, len);
+    return val;
+  };
+
+  if( ! (TYPE(key) == T_STRING || TYPE(key) == T_SYMBOL ) ){
+    rb_raise(rb_eTypeError, "the key must be a string or symbol");
+  };
+
+  id = rb_to_id(key);
+  Data_Get_Struct(self, struct ptr_data, data);
+  switch( data->ctype ){
+  case DLPTR_CTYPE_STRUCT:
+    offset = 0;
+    for( i=0; i < data->ids_num; i++ ){
+      if( data->ids[i] == id ){
+	switch( data->stype[i] ){
+	case 'I':
+	  DLALIGN(data->ptr,offset,INT_ALIGN);
+	  break;
+	case 'L':
+	  DLALIGN(data->ptr,offset,LONG_ALIGN);
+	  break;
+	case 'P':
+	  DLALIGN(data->ptr,offset,VOIDP_ALIGN);
+	  break;
+	case 'D':
+	  DLALIGN(data->ptr,offset,DOUBLE_ALIGN);
+	  break;
+	case 'F':
+	  DLALIGN(data->ptr,offset,FLOAT_ALIGN);
+	  break;
+	case 'C':
+	  break;
+	case 'H':
+	  DLALIGN(data->ptr,offset,SHORT_ALIGN);
+	  break;
+	default:
+	  raise(rb_eDLTypeError, "unsupported type '%c'", data->stype[i]);
+	};
+	memimg = ary2cary(data->stype[i], val, &memsize);
+	memcpy(data->ptr + offset, memimg, memsize);
+	return val;
+      };
+      switch( data->stype[i] ){
+      case 'I':
+      case 'i':
+	offset += sizeof(int) * data->ssize[i];
+	break;
+      case 'L':
+      case 'l':
+	offset += sizeof(long) * data->ssize[i];
+	break;
+      case 'P':
+      case 'p':
+	offset += sizeof(void*) * data->ssize[i];
+	break;
+      case 'D':
+      case 'd':
+	offset += sizeof(double) * data->ssize[i];
+	break;
+      case 'F':
+      case 'f':
+	offset += sizeof(float) * data->ssize[i];
+	break;
+      case 'C':
+      case 'c':
+	offset += sizeof(char) * data->ssize[i];
+	break;
+      case 'H':
+      case 'h':
+	offset += sizeof(short) * data->ssize[i];
+	break;
+      default:
+	raise(rb_eDLTypeError, "unsupported type '%c'", data->stype[i]);
+      };
+    };
+    return val;
+    /* break; */
+  case DLPTR_CTYPE_UNION:
+    for( i=0; i < data->ids_num; i++ ){
+      if( data->ids[i] == id ){
+	switch( data->stype[i] ){
+	case 'I': case 'i':
+	  memsize = sizeof(int) * data->ssize[i];
+	  break;
+	case 'L': case 'l':
+	  memsize = sizeof(long) * data->ssize[i];
+	  break;
+	case 'P': case 'p':
+	  memsize = sizeof(void*) * data->ssize[i];
+	  break;
+	case 'F': case 'f':
+	  memsize = sizeof(float) * data->ssize[i];
+	  break;
+	case 'D': case 'd':
+	  memsize = sizeof(double) * data->ssize[i];
+	  break;
+	case 'C': case 'c':
+	  memsize = sizeof(char) * data->ssize[i];
+	  break;
+	case 'H': case 'h':
+	  memsize = sizeof(short) * data->ssize[i];
+	  break;
+	default:
+	  raise(rb_eDLTypeError, "unsupported type '%c'", data->stype[i]);
+	};
+	memimg = ary2cary(data->stype[i], val, NULL);
+	memcpy(data->ptr, memimg, memsize);
+      };
+    };
+    return val;
+    /* break; */
+  };
+
+  rb_raise(rb_eNameError, "undefined key `%s' for %s",
+	   rb_id2name(id), rb_class2name(CLASS_OF(self)));
+
+  return Qnil;
+};
+
+VALUE
+rb_dlptr_size(int argc, VALUE argv[], VALUE self)
+{
+  VALUE size;
+
+  switch( rb_scan_args(argc, argv, "01", &size) ){
+  case 0:
+    return DLLONG2NUM(RDLPTR(self)->size);
+  case 1:
+    RDLPTR(self)->size = DLNUM2LONG(size);
+    return size;
+  };
+};
+
+static VALUE
+dlmem_each_i(VALUE assoc, void *data)
+{
+  VALUE key, val;
+  key = rb_ary_entry(assoc, 0);
+  val = rb_ary_entry(assoc, 1);
+  rb_yield(rb_assoc_new(key,(VALUE)DLNUM2LONG(val)));
+  return Qnil;
+};
+
+VALUE
+rb_dlmem_each(VALUE self)
+{
+  rb_iterate(rb_each, DLMemoryTable, dlmem_each_i, 0);
+  return Qnil;
+};
+
+void
+Init_dlptr()
+{
+  rb_cDLPtrData = rb_define_class_under(rb_mDL, "PtrData", rb_cData);
+  rb_define_singleton_method(rb_cDLPtrData, "new", rb_dlptr_s_new, -1);
+  rb_define_singleton_method(rb_cDLPtrData, "alloc", rb_dlptr_s_alloc, -1);
+  rb_define_method(rb_cDLPtrData, "initialize", rb_dlptr_init, -1);
+  rb_define_method(rb_cDLPtrData, "free=", rb_dlptr_free_set, 1);
+  rb_define_method(rb_cDLPtrData, "free",  rb_dlptr_free_get, 0);
+  rb_define_method(rb_cDLPtrData, "to_i",  rb_dlptr_to_i, 0);
+  rb_define_method(rb_cDLPtrData, "ptr",   rb_dlptr_ptr, 0);
+  rb_define_method(rb_cDLPtrData, "+@", rb_dlptr_ptr, 0);
+  rb_define_method(rb_cDLPtrData, "ref",   rb_dlptr_ref, 0);
+  rb_define_method(rb_cDLPtrData, "-@", rb_dlptr_ref, 0);
+  rb_define_method(rb_cDLPtrData, "null?", rb_dlptr_null_p, 0);
+  rb_define_method(rb_cDLPtrData, "to_a", rb_dlptr_to_array, -1);
+  rb_define_method(rb_cDLPtrData, "to_s", rb_dlptr_to_s, -1);
+  rb_define_method(rb_cDLPtrData, "to_str", rb_dlptr_to_str, -1);
+  rb_define_method(rb_cDLPtrData, "inspect", rb_dlptr_inspect, 0);
+  rb_define_method(rb_cDLPtrData, "<=>", rb_dlptr_cmp, 1);
+  rb_define_method(rb_cDLPtrData, "==", rb_dlptr_eql, 1);
+  rb_define_method(rb_cDLPtrData, "eql?", rb_dlptr_eql, 1);
+  rb_define_method(rb_cDLPtrData, "+", rb_dlptr_plus, 1);
+  rb_define_method(rb_cDLPtrData, "-", rb_dlptr_minus, 1);
+  rb_define_method(rb_cDLPtrData, "cast!", rb_dlptr_cast, -1);
+  rb_define_method(rb_cDLPtrData, "define_data_type",
+		   rb_dlptr_define_data_type, -1);
+  rb_define_method(rb_cDLPtrData, "struct!", rb_dlptr_define_struct, -1);
+  rb_define_method(rb_cDLPtrData, "union!",  rb_dlptr_define_union,  -1);
+  rb_define_method(rb_cDLPtrData, "data_type", rb_dlptr_get_data_type, 0);
+  rb_define_method(rb_cDLPtrData, "[]", rb_dlptr_aref, -1);
+  rb_define_method(rb_cDLPtrData, "[]=", rb_dlptr_aset, -1);
+  rb_define_method(rb_cDLPtrData, "size", rb_dlptr_size, -1);
+  rb_define_method(rb_cDLPtrData, "size=", rb_dlptr_size, -1);
+
+  rb_mDLMemorySpace = rb_define_module_under(rb_mDL, "MemorySpace");
+  DLMemoryTable = rb_hash_new();
+  rb_define_const(rb_mDLMemorySpace, "MemoryTable", DLMemoryTable);
+  rb_define_module_function(rb_mDLMemorySpace, "each", rb_dlmem_each, 0);
+};