Push Data

SWF Action

Action Category:

Stack

Action Details:

Action Identifier:

150

Action Structure:

struct {
	unsigned char   f_type
	<type>          f_data
} f_push_data[<variable>];

Action Length:

-1 byte(s)

Action Stack:

push <variable> (a)

Action Operation:

a₁ = f_data[0];1
push(a₁);
a₂ = f_data[1];
push(a₂);
a₃ = f_data[2];
push(a₃);
...
a_n = f_data[n];
push(a_n);

1. Notice that the first data in the action is the last accessible on your stack.

Action Flash Version:

See Also:

Duplicate

Pop

Swap

Push some immediate data on the stack. This action was introduced in V4.0. The supported data types vary depending on the version of the player you have. As many values as necessary can be pushed at once. The f_push_data structure will be repeated multiple times as required. For instance, to push two strings on the stack at once, you would use the following code:

96
0C 00
00 't' 'e' 's' 't' 00
00 'm' 'o' 'r' 'e' 00

Most of the time, it is a good idea to push more data and then use the Swap action to reorder. Extra PushData actions require at least 3 bytes when the Swap action is only one.

The following is the table of types accepted in this action:

ID	Name	Data	Comments	Version
0x00	String	string f_string	Push a string on the stack.	4
0x01	Float (32 bits)	float f_float;	Push a 32 bits IEEE floating point value on the stack. This type can be used to specify a Property reference. Note that the property reference will be saved as a floating point value though only the integral part will be used.	4
0x02	NULL	<none>	Push NULL on the stack. This very looks like zero (0) except that it can be used as an object pointer.	5
0x03	Undefined	<none>	Push an undefined object on the stack. This is not a string, integer, float or Boolean. It simply is an undefined element. Any operation on an undefined element yields undefined except an equal comparison (and some operations such as a Pop).	5
0x04	Register	unsigned char f_register;	Push the content of the given register on the stack. In the main thread, you have 4 registers in SWF (number 0, 1, 2 and 3). Since SWF version 7, it is possible to use up to 256 registers in a Declare Function (V7). However, outside such a function, the limit is the same. To set a register, use the Store Register action.	5
0x05	Boolean	unsigned char f_boolean;	Push a Boolean value on the stack (f_boolean needs to be 0 or 1).	5
0x06	Double (64 bits)	unsigned char f_value[8];	An IEEE double value saved in a strange way. The following gives you the C code used to read these double values. double result; char value[8]; value[4] = ReadByte(input_stream); value[5] = ReadByte(input_stream); value[6] = ReadByte(input_stream); value[7] = ReadByte(input_stream); value[0] = ReadByte(input_stream); value[1] = ReadByte(input_stream); value[2] = ReadByte(input_stream); value[3] = ReadByte(input_stream); result = * (double *) value;	5
0x07	Integer	unsigned long f_integer;	Push an integer on the stack.	5
0x08	Dictionary Lookup	unsigned char f_reference;	Push a string as declared with a Declare Dictionary action. The very first string in a dictionary has reference 0. There can only be up to 256 strings push with this instruction.	5
0x09	Large Dictionary Lookup	unsigned short f_reference;	Push a string as declared with a Declare Dictionary action. The very first string in a dictionary has reference 0. There can be up to 65534 strings pushed this way. Note that the strings 0 to 255 should use the type 0x08 instead.	5