[PATCH 3/5] mshtml: Track responseText's length in XHRs and report it manually.

[Gabriel Ivăncescu]

From: Gabriel Ivăncescu

Signed-off-by: Gabriel Ivăncescu 
---
 dlls/mshtml/xmlhttprequest.c | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/dlls/mshtml/xmlhttprequest.c b/dlls/mshtml/xmlhttprequest.c
index 0efe4c3ac85..f4082bc8e3d 100644
--- a/dlls/mshtml/xmlhttprequest.c
+++ b/dlls/mshtml/xmlhttprequest.c
@@ -139,6 +139,7 @@ struct HTMLXMLHttpRequest {
     IProvideClassInfo2 IProvideClassInfo2_iface;
     LONG ref;
     LONG readyState;
+    size_t responseText_length;
     response_type_t response_type;
     nsIXMLHttpRequest *nsxhr;
     XMLHttpReqEventListener *event_listener;
@@ -225,7 +226,9 @@ static nsrefcnt NSAPI XMLHttpReqEventListener_Release(nsIDOMEventListener *iface
 static nsresult NSAPI XMLHttpReqEventListener_HandleEvent(nsIDOMEventListener *iface, nsIDOMEvent *nsevent)
 {
     XMLHttpReqEventListener *This = impl_from_nsIDOMEventListener(iface);
+    const PRUnichar *text;
     UINT16 readyState;
+    nsAString nsstr;
     DOMEvent *event;
     HRESULT hres;

@@ -234,9 +237,21 @@ static nsresult NSAPI XMLHttpReqEventListener_HandleEvent(nsIDOMEventListener *i
     if(!This->xhr)
         return NS_OK;

-    if(NS_SUCCEEDED(nsIXMLHttpRequest_GetReadyState(This->xhr->nsxhr, &readyState)))
+    if(NS_SUCCEEDED(nsIXMLHttpRequest_GetReadyState(This->xhr->nsxhr, &readyState))) {
         This->xhr->readyState = readyState;

+        if(This->xhr->readyState >= 3) {
+            nsAString_Init(&nsstr, NULL);
+            if(NS_SUCCEEDED(nsIXMLHttpRequest_GetResponseText(This->xhr->nsxhr, &nsstr))) {
+                /* Avoid recalculating from the beginning, since it can't be shorter */
+                nsAString_GetData(&nsstr, &text);
+                if(text && text[0])
+                    This->xhr->responseText_length += wcslen(text + This->xhr->responseText_length);
+                nsAString_Finish(&nsstr);
+            }
+        }
+    }
+
     hres = create_event_from_nsevent(nsevent, dispex_compat_mode(&This->xhr->event_target.dispex), &event);
     if(SUCCEEDED(hres) ){
         dispatch_event(&This->xhr->event_target, event);
@@ -368,6 +383,8 @@ static HRESULT WINAPI HTMLXMLHttpRequest_get_responseBody(IHTMLXMLHttpRequest *i
 static HRESULT WINAPI HTMLXMLHttpRequest_get_responseText(IHTMLXMLHttpRequest *iface, BSTR *p)
 {
     HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
+    const PRUnichar *text;
+    HRESULT hres = S_OK;
     nsAString nsstr;
     nsresult nsres;

@@ -383,7 +400,17 @@ static HRESULT WINAPI HTMLXMLHttpRequest_get_responseText(IHTMLXMLHttpRequest *i

nsAString_Init(&nsstr, NULL);
     nsres = nsIXMLHttpRequest_GetResponseText(This->nsxhr, &nsstr);
-    return return_nsstr(nsres, &nsstr, p);
+    if(NS_FAILED(nsres))
+        hres = map_nsresult(nsres);
+    else {
+        nsAString_GetData(&nsstr, &text);
+        if(!text || !text[0])
+            *p = NULL;
+        else if(!(*p = SysAllocStringLen(text, This->responseText_length)))
+            hres = E_OUTOFMEMORY;
+        nsAString_Finish(&nsstr);
+    }
+    return hres;
 }

static HRESULT WINAPI HTMLXMLHttpRequest_get_responseXML(IHTMLXMLHttpRequest *iface, IDispatch **p)