The Tor Browser / file comparison
comparison: js/xpconnect/src/XPCString.cpp
js/xpconnect/src/XPCString.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:a3d678638984 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | |
| 2 /* vim: set ts=8 sts=4 et sw=4 tw=99: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 /* | |
| 8 * Infrastructure for sharing DOMString data with JSStrings. | |
| 9 * | |
| 10 * Importing an nsAString into JS: | |
| 11 * If possible (GetSharedBufferHandle works) use the external string support in | |
| 12 * JS to create a JSString that points to the readable's buffer. We keep a | |
| 13 * reference to the buffer handle until the JSString is finalized. | |
| 14 * | |
| 15 * Exporting a JSString as an nsAReadable: | |
| 16 * Wrap the JSString with a root-holding XPCJSReadableStringWrapper, which roots | |
| 17 * the string and exposes its buffer via the nsAString interface, as | |
| 18 * well as providing refcounting support. | |
| 19 */ | |
| 20 | |
| 21 #include "nscore.h" | |
| 22 #include "nsString.h" | |
| 23 #include "nsStringBuffer.h" | |
| 24 #include "jsapi.h" | |
| 25 #include "xpcpublic.h" | |
| 26 | |
| 27 using namespace JS; | |
| 28 | |
| 29 // static | |
| 30 void | |
| 31 XPCStringConvert::FreeZoneCache(JS::Zone *zone) | |
| 32 { | |
| 33 // Put the zone user data into an AutoPtr (which will do the cleanup for us), | |
| 34 // and null out the user data (which may already be null). | |
| 35 nsAutoPtr<ZoneStringCache> cache(static_cast<ZoneStringCache*>(JS_GetZoneUserData(zone))); | |
| 36 JS_SetZoneUserData(zone, nullptr); | |
| 37 } | |
| 38 | |
| 39 // static | |
| 40 void | |
| 41 XPCStringConvert::ClearZoneCache(JS::Zone *zone) | |
| 42 { | |
| 43 ZoneStringCache *cache = static_cast<ZoneStringCache*>(JS_GetZoneUserData(zone)); | |
| 44 if (cache) { | |
| 45 cache->mBuffer = nullptr; | |
| 46 cache->mString = nullptr; | |
| 47 } | |
| 48 } | |
| 49 | |
| 50 // static | |
| 51 void | |
| 52 XPCStringConvert::FinalizeLiteral(const JSStringFinalizer *fin, jschar *chars) | |
| 53 { | |
| 54 } | |
| 55 | |
| 56 const JSStringFinalizer XPCStringConvert::sLiteralFinalizer = | |
| 57 { XPCStringConvert::FinalizeLiteral }; | |
| 58 | |
| 59 // static | |
| 60 void | |
| 61 XPCStringConvert::FinalizeDOMString(const JSStringFinalizer *fin, jschar *chars) | |
| 62 { | |
| 63 nsStringBuffer* buf = nsStringBuffer::FromData(chars); | |
| 64 buf->Release(); | |
| 65 } | |
| 66 | |
| 67 const JSStringFinalizer XPCStringConvert::sDOMStringFinalizer = | |
| 68 { XPCStringConvert::FinalizeDOMString }; | |
| 69 | |
| 70 // convert a readable to a JSString, copying string data | |
| 71 // static | |
| 72 bool | |
| 73 XPCStringConvert::ReadableToJSVal(JSContext *cx, | |
| 74 const nsAString &readable, | |
| 75 nsStringBuffer** sharedBuffer, | |
| 76 MutableHandleValue vp) | |
| 77 { | |
| 78 *sharedBuffer = nullptr; | |
| 79 | |
| 80 uint32_t length = readable.Length(); | |
| 81 | |
| 82 if (readable.IsLiteral()) { | |
| 83 JSString *str = JS_NewExternalString(cx, | |
| 84 static_cast<const jschar*>(readable.BeginReading()), | |
| 85 length, &sLiteralFinalizer); | |
| 86 if (!str) | |
| 87 return false; | |
| 88 vp.setString(str); | |
| 89 return true; | |
| 90 } | |
| 91 | |
| 92 nsStringBuffer *buf = nsStringBuffer::FromString(readable); | |
| 93 if (buf) { | |
| 94 bool shared; | |
| 95 if (!StringBufferToJSVal(cx, buf, length, vp, &shared)) | |
| 96 return false; | |
| 97 if (shared) | |
| 98 *sharedBuffer = buf; | |
| 99 return true; | |
| 100 } | |
| 101 | |
| 102 // blech, have to copy. | |
| 103 JSString *str = JS_NewUCStringCopyN(cx, readable.BeginReading(), length); | |
| 104 if (!str) | |
| 105 return false; | |
| 106 vp.setString(str); | |
| 107 return true; | |
| 108 } |
