Resource.c

/*
 * Copyright (c) 2016-2020  Moddable Tech, Inc.
 *
 *   This file is part of the Moddable SDK Runtime.
 * 
 *   The Moddable SDK Runtime is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 * 
 *   The Moddable SDK Runtime is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Lesser General Public License for more details.
 * 
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with the Moddable SDK Runtime.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "xs.h"
#include "string.h"
#include "mc.xs.h"

extern const void* fxGetArchiveData(xsMachine* the, char* path, size_t* size);
extern const void* mcGetResource(xsMachine* the, char* path, size_t* size);

void Resource_destructor(void *data)
{
	/* nothing to do */
}

void Resource_constructor(xsMachine *the)
{
	xsStringValue path = xsToString(xsArg(0));
	const void *data;
	size_t size;

	data = fxGetArchiveData(the, path, &size);
	if (!data)
		data = mcGetResource(the, path, &size);
	if (!data)
		xsURIError("Resource not found: %s", path);
	xsSetHostData(xsThis, (void *)data);
	xsSet(xsThis, xsID_byteLength, xsInteger(size));
}

void Resource_exists(xsMachine *the)
{
	xsStringValue path = xsToString(xsArg(0));
	const void *data;
	size_t size;
	data = fxGetArchiveData(the, path, &size);
	if (!data)
		data = mcGetResource(the, path, &size);
	xsResult = data ? xsTrue : xsFalse;
}

void Resource_slice(xsMachine *the)
{
	int argc = xsToInteger(xsArgc);
	unsigned char *data = (unsigned char *)xsGetHostData(xsThis);
	int start = xsToInteger(xsArg(0));
	int end;
	int byteLength;
	xsBooleanValue copy = 1;

	xsResult = xsGet(xsThis, xsID_byteLength);
	byteLength = xsToInteger(xsResult);

	if (argc > 1) {
		end = xsToInteger(xsArg(1));
		if (end > byteLength)
			end = byteLength;
		if (argc > 2)
			copy = xsTest(xsArg(2));
	}
	else
		end = byteLength;

	if (copy)
		xsResult = xsArrayBuffer(data + start, end - start);
	else {
		xsResult = xsNewHostObject(NULL);
		xsSetHostData(xsResult, data + start);
		xsSet(xsResult, xsID_byteLength, xsInteger(end - start));
	}
}