How to pass ByteArray to C code using FlasCC - actionscript

Question

I want to pass ByteArray from ActionScript to C function.
basically I want do something like this:
void init() __attribute__((used,annotate("as3sig:public function init(byteData: ByteArray):int"),
annotate("as3package:example")));
void init()
{
//here I want to pass byteArray data to C variable.
//similar to AS3_GetScalarFromVar(cVar, asVar)
}
Unforunately I cannot find any function in flascc docs to help me with this.

Answer 1

Example:
void _init_c(void) __attribute((used,
annotate("as3sig:public function init(byteData:ByteArray) : void"),
annotate("as3import:flash.utils.ByteArray")));
void _init_c()
{
char *byteArray_c;
unsigned int len;
inline_as3("%0 = byteData.bytesAvailable;" : "=r"(len));
byteArray_c = (char *)malloc(len);
inline_as3("CModule.ram.position = %0;" : : "r"(byteArray_c));
inline_as3("byteData.readBytes(CModule.ram);");
// Now byteArray_c points to a copy of the data from byteData.
// Note that byteData.position has changed to the end of the stream.
// ... do stuff ...
free(byteArray_c);
}
The key here is that the heap in C is exposed on the AS3 side as CModule.ram, which is a ByteArray object.
A pointer malloc'd in C is seen in AS3 as an offset into CModule.ram.

Answer 2

You should use CModule.malloc and CModule.writeBytes methods to manipulate with pointers in C-style manner. Take a look on $FLASCC/samples/06_SWIG/PassingData/PassData.as

Answer 3

void _init_c(void) __attribute((used,
annotate("as3sig:public function init(byteData:ByteArray) : void"),
annotate("as3import:flash.utils.ByteArray")));
void _init_c()
{
char *byteArray_c;
unsigned int len;
inline_as3("%0 = byteData.bytesAvailable;" : "=r"(len));
byteArray_c = (char *) malloc(len);
inline_as3("byteData.readBytes(CModule.ram, %0, %1);" : : "r"(byteArray_c), "r"(len));
// Now byteArray_c points to a copy of the data from byteData.
// Note that byteData.position has changed to the end of the stream.
// ... do stuff ...
free(byteArray_c);
}