gecko-dev/dom/workers/FileReaderSync.cpp
2012-05-21 12:12:37 +01:00

338 lines
8.2 KiB
C++

/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "FileReaderSync.h"
#include "nsIDOMFile.h"
#include "nsDOMError.h"
#include "jsapi.h"
#include "jsatom.h"
#include "jsfriendapi.h"
#include "nsJSUtils.h"
#include "Exceptions.h"
#include "File.h"
#include "FileReaderSyncPrivate.h"
#include "WorkerInlines.h"
#define FUNCTION_FLAGS \
JSPROP_ENUMERATE
USING_WORKERS_NAMESPACE
using mozilla::dom::workers::exceptions::ThrowDOMExceptionForNSResult;
namespace {
inline bool
EnsureSucceededOrThrow(JSContext* aCx, nsresult rv)
{
if (NS_SUCCEEDED(rv)) {
return true;
}
rv = rv == NS_ERROR_FILE_NOT_FOUND ?
NS_ERROR_DOM_FILE_NOT_FOUND_ERR :
NS_ERROR_DOM_FILE_NOT_READABLE_ERR;
ThrowDOMExceptionForNSResult(aCx, rv);
return false;
}
inline nsIDOMBlob*
GetDOMBlobFromJSObject(JSContext* aCx, JSObject* aObj) {
// aObj can be null as JS_ConvertArguments("o") successfully converts JS
// null to a null pointer to JSObject
if (aObj) {
nsIDOMBlob* blob = file::GetDOMBlobFromJSObject(aObj);
if (blob) {
return blob;
}
}
JS_ReportErrorNumber(aCx, js_GetErrorMessage, NULL, JSMSG_UNEXPECTED_TYPE,
aObj ? JS_GetClass(aObj)->name : "Object", "not a Blob.");
return NULL;
}
class FileReaderSync
{
// FileReaderSync should not be instantiated.
FileReaderSync();
~FileReaderSync();
static JSClass sClass;
static JSFunctionSpec sFunctions[];
public:
static JSObject*
InitClass(JSContext* aCx, JSObject* aObj)
{
return JS_InitClass(aCx, aObj, NULL, &sClass, Construct, 0,
NULL, sFunctions, NULL, NULL);
}
static FileReaderSyncPrivate*
GetPrivate(JSObject* aObj)
{
if (aObj) {
JSClass* classPtr = JS_GetClass(aObj);
if (classPtr == &sClass) {
FileReaderSyncPrivate* fileReader =
GetJSPrivateSafeish<FileReaderSyncPrivate>(aObj);
return fileReader;
}
}
return NULL;
}
private:
static FileReaderSyncPrivate*
GetInstancePrivate(JSContext* aCx, JSObject* aObj, const char* aFunctionName)
{
FileReaderSyncPrivate* fileReader = GetPrivate(aObj);
if (fileReader) {
return fileReader;
}
JS_ReportErrorNumber(aCx, js_GetErrorMessage, NULL,
JSMSG_INCOMPATIBLE_PROTO, sClass.name, aFunctionName,
JS_GetClass(aObj)->name);
return NULL;
}
static JSBool
Construct(JSContext* aCx, unsigned aArgc, jsval* aVp)
{
JSObject* obj = JS_NewObject(aCx, &sClass, NULL, NULL);
if (!obj) {
return false;
}
FileReaderSyncPrivate* fileReader = new FileReaderSyncPrivate();
NS_ADDREF(fileReader);
SetJSPrivateSafeish(obj, fileReader);
JS_SET_RVAL(aCx, aVp, OBJECT_TO_JSVAL(obj));
return true;
}
static void
Finalize(JSFreeOp* aFop, JSObject* aObj)
{
JS_ASSERT(JS_GetClass(aObj) == &sClass);
FileReaderSyncPrivate* fileReader =
GetJSPrivateSafeish<FileReaderSyncPrivate>(aObj);
NS_IF_RELEASE(fileReader);
}
static JSBool
ReadAsArrayBuffer(JSContext* aCx, unsigned aArgc, jsval* aVp)
{
JSObject* obj = JS_THIS_OBJECT(aCx, aVp);
if (!obj) {
return false;
}
FileReaderSyncPrivate* fileReader =
GetInstancePrivate(aCx, obj, "readAsArrayBuffer");
if (!fileReader) {
return false;
}
JSObject* jsBlob;
if (!JS_ConvertArguments(aCx, aArgc, JS_ARGV(aCx, aVp), "o", &jsBlob)) {
return false;
}
nsIDOMBlob* blob = GetDOMBlobFromJSObject(aCx, jsBlob);
if (!blob) {
return false;
}
PRUint64 blobSize;
nsresult rv = blob->GetSize(&blobSize);
if (!EnsureSucceededOrThrow(aCx, rv)) {
return false;
}
JSObject* jsArrayBuffer = JS_NewArrayBuffer(aCx, blobSize);
if (!jsArrayBuffer) {
return false;
}
uint32_t bufferLength = JS_GetArrayBufferByteLength(jsArrayBuffer, aCx);
uint8_t* arrayBuffer = JS_GetArrayBufferData(jsArrayBuffer, aCx);
rv = fileReader->ReadAsArrayBuffer(blob, bufferLength, arrayBuffer);
if (!EnsureSucceededOrThrow(aCx, rv)) {
return false;
}
JS_SET_RVAL(aCx, aVp, OBJECT_TO_JSVAL(jsArrayBuffer));
return true;
}
static JSBool
ReadAsDataURL(JSContext* aCx, unsigned aArgc, jsval* aVp)
{
JSObject* obj = JS_THIS_OBJECT(aCx, aVp);
if (!obj) {
return false;
}
FileReaderSyncPrivate* fileReader =
GetInstancePrivate(aCx, obj, "readAsDataURL");
if (!fileReader) {
return false;
}
JSObject* jsBlob;
if (!JS_ConvertArguments(aCx, aArgc, JS_ARGV(aCx, aVp), "o", &jsBlob)) {
return false;
}
nsIDOMBlob* blob = GetDOMBlobFromJSObject(aCx, jsBlob);
if (!blob) {
return false;
}
nsString blobText;
nsresult rv = fileReader->ReadAsDataURL(blob, blobText);
if (!EnsureSucceededOrThrow(aCx, rv)) {
return false;
}
JSString* jsBlobText = JS_NewUCStringCopyN(aCx, blobText.get(),
blobText.Length());
if (!jsBlobText) {
return false;
}
JS_SET_RVAL(aCx, aVp, STRING_TO_JSVAL(jsBlobText));
return true;
}
static JSBool
ReadAsBinaryString(JSContext* aCx, unsigned aArgc, jsval* aVp)
{
JSObject* obj = JS_THIS_OBJECT(aCx, aVp);
if (!obj) {
return false;
}
FileReaderSyncPrivate* fileReader =
GetInstancePrivate(aCx, obj, "readAsBinaryString");
if (!fileReader) {
return false;
}
JSObject* jsBlob;
if (!JS_ConvertArguments(aCx, aArgc, JS_ARGV(aCx, aVp), "o", &jsBlob)) {
return false;
}
nsIDOMBlob* blob = GetDOMBlobFromJSObject(aCx, jsBlob);
if (!blob) {
return false;
}
nsString blobText;
nsresult rv = fileReader->ReadAsBinaryString(blob, blobText);
if (!EnsureSucceededOrThrow(aCx, rv)) {
return false;
}
JSString* jsBlobText = JS_NewUCStringCopyN(aCx, blobText.get(),
blobText.Length());
if (!jsBlobText) {
return false;
}
JS_SET_RVAL(aCx, aVp, STRING_TO_JSVAL(jsBlobText));
return true;
}
static JSBool
ReadAsText(JSContext* aCx, unsigned aArgc, jsval* aVp)
{
JSObject* obj = JS_THIS_OBJECT(aCx, aVp);
if (!obj) {
return false;
}
FileReaderSyncPrivate* fileReader =
GetInstancePrivate(aCx, obj, "readAsText");
if (!fileReader) {
return false;
}
JSObject* jsBlob;
JSString* jsEncoding = JS_GetEmptyString(JS_GetRuntime(aCx));
if (!JS_ConvertArguments(aCx, aArgc, JS_ARGV(aCx, aVp), "o/S", &jsBlob,
&jsEncoding)) {
return false;
}
nsDependentJSString encoding;
if (!encoding.init(aCx, jsEncoding)) {
return false;
}
nsIDOMBlob* blob = GetDOMBlobFromJSObject(aCx, jsBlob);
if (!blob) {
return false;
}
nsString blobText;
nsresult rv = fileReader->ReadAsText(blob, encoding, blobText);
if (!EnsureSucceededOrThrow(aCx, rv)) {
return false;
}
JSString* jsBlobText = JS_NewUCStringCopyN(aCx, blobText.get(),
blobText.Length());
if (!jsBlobText) {
return false;
}
JS_SET_RVAL(aCx, aVp, STRING_TO_JSVAL(jsBlobText));
return true;
}
};
JSClass FileReaderSync::sClass = {
"FileReaderSync",
JSCLASS_HAS_PRIVATE,
JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_StrictPropertyStub,
JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, Finalize
};
JSFunctionSpec FileReaderSync::sFunctions[] = {
JS_FN("readAsArrayBuffer", ReadAsArrayBuffer, 1, FUNCTION_FLAGS),
JS_FN("readAsBinaryString", ReadAsBinaryString, 1, FUNCTION_FLAGS),
JS_FN("readAsText", ReadAsText, 1, FUNCTION_FLAGS),
JS_FN("readAsDataURL", ReadAsDataURL, 1, FUNCTION_FLAGS),
JS_FS_END
};
} // anonymous namespace
BEGIN_WORKERS_NAMESPACE
namespace filereadersync {
bool
InitClass(JSContext* aCx, JSObject* aGlobal)
{
return !!FileReaderSync::InitClass(aCx, aGlobal);
}
} // namespace filereadersync
END_WORKERS_NAMESPACE