JS_XDRNewMem(JSContext *cx, JSXDRMode mode)
{
JSXDRState *xdr = (JSXDRState *) JS_malloc(cx, sizeof(JSXDRMemState));
if (!xdr)
return NULL;
JS_XDRInitBase(xdr, mode, cx);
if (mode == JSXDR_ENCODE) {
if (!(MEM_BASE(xdr) = JS_malloc(cx, MEM_BLOCK))) {
JS_free(cx, xdr);
return NULL;
}
} else {
/* XXXbe ok, so better not deref MEM_BASE(xdr) if not ENCODE */
MEM_BASE(xdr) = NULL;
}
xdr->ops = &xdrmem_ops;
MEM_COUNT(xdr) = 0;
MEM_LIMIT(xdr) = MEM_BLOCK;
return xdr;
}
/* XDRFile constructor */
JSXDRState * gpsee_XDRNewFile(JSContext *cx, JSXDRMode mode, const char *filename, FILE *f)
{
struct XDRFile *xdr;
const char *fopen_mode;
int own_file = 0;
switch (mode)
{
case JSXDR_ENCODE:
fopen_mode = "w";
break;
case JSXDR_DECODE:
fopen_mode = "r";
break;
default:
gpsee_throw(cx, "gpsee_XDRNewFile() error: invalid mode argument (%d as opposed to %d or %d)",
mode, JSXDR_ENCODE, JSXDR_DECODE);
return NULL;
}
if (!f)
{
if (!filename || !(f = fopen(filename, fopen_mode)))
return NULL;
own_file = 1;
}
/* Allocate our XDRState and also our internal XDRFile struct */
xdr = (struct XDRFile*) JS_malloc(cx, sizeof(struct XDRFile));
if (!xdr)
{
if (own_file)
fclose(f);
return NULL;
}
/* Initialize our XDRState */
JS_XDRInitBase(&xdr->xdr, mode, cx);
/* Initialize our internal XDRFile members */
xdr->f = f;
xdr->raw = NULL;
xdr->rawlive = 0;
xdr->rawlen = 0;
xdr->rawsize = 0;
xdr->own_file = own_file;
/* Teach the new XDR object our XDROps implementation */
xdr->xdr.ops = &xdrfile_ops;
/* Map file into memory if we're in read mode */
#ifdef XDR_USES_MMAP
xdr->map = NULL;
xdr->maplen = 0;
xdr->mappos = NULL;
xdr->mapend = NULL;
/* Map read-only files into memory if possible */
if (mode != JSXDR_ENCODE)
{
/* Get the size of the file */
struct stat st;
if (fstat(fileno(f), &st))
{
/* Should never ever ever happen! */
dprintf("warning: fstat(\"%s\" fd=%d) failed: %m\n", filename, fileno(f));
}
else
{
/* Map the file into memory! */
xdr->maplen = st.st_size;
xdr->map = mmap(NULL, xdr->maplen, PROT_READ, MAP_PRIVATE, fileno(f), 0);
if (xdr->map == MAP_FAILED)
{
dprintf("warning: mmap() failed: %m\n");
}
xdr->mappos = xdr->map;
xdr->mapend = xdr->map + xdr->maplen;
}
}
#endif
return (JSXDRState*) xdr;
}
