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

CopyJob::CopyJob(Handle * as, Handle * ad, ssize_t asiz, bool ads) : s(as), d(ad), ds(ads), siz(asiz), cursiz(0), r(0) {
    WaitFor(s, W4_STICKY | W4_READING);
    WaitFor(d, W4_STICKY | W4_WRITING);
}

CopyJob::~CopyJob() { }

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

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