#include "CopyJob.h"
#include "General.h"

CopyJob::CopyJob(Handle * as, Handle * ad, ssize_t asiz) : s(as), d(ad), siz(asiz), cursiz(0), current(0) { }

CopyJob::~CopyJob() { }

int CopyJob::Do() throw (GeneralException) {
    int r, tr;
    
    while (!s->IsClosed() || (siz != cursiz)) {
	switch (current) {
	case 0:
	    tr = siz >= 0 ? siz - cursiz : COPY_BUFSIZ;
	    try {
		r = s->read(buffer, MIN(COPY_BUFSIZ, tr));
	    }
	    catch (IOAgain e) {
		throw TaskSwitch();
	    }
	case 1:
	    try {
		d->write(buffer, r);
	    }
	    catch (IOAgain e) {
		current = 1;
		throw TaskSwitch();
	    }
	    current = 0;
	}
	cursiz += r;
    }
}

String CopyJob::GetName() {
    return (String("CopyJob from ") + s->GetName() + " to " + d->GetName());
}