Andrew Nguyen : msxml3: Extend the lifetime of the SAX callback BSTRs beyond the callback invocation .
Module: wine Branch: master Commit: 9c5d5d8ed5b95e60b61b8a31e85d5c5edee28c24 URL: http://source.winehq.org/git/wine.git/?a=commit;h=9c5d5d8ed5b95e60b61b8a31e8... Author: Andrew Nguyen <anguyen(a)codeweavers.com> Date: Fri Jul 15 07:38:07 2011 -0500 msxml3: Extend the lifetime of the SAX callback BSTRs beyond the callback invocation. --- dlls/msxml3/saxreader.c | 135 +++++++++++++++++++++++++++++++++++++---------- 1 files changed, 106 insertions(+), 29 deletions(-) diff --git a/dlls/msxml3/saxreader.c b/dlls/msxml3/saxreader.c index 4f0a5f1..5bf6eda 100644 --- a/dlls/msxml3/saxreader.c +++ b/dlls/msxml3/saxreader.c @@ -49,6 +49,13 @@ WINE_DEFAULT_DEBUG_CHANNEL(msxml); #ifdef HAVE_LIBXML2 +struct bstrpool +{ + BSTR *pool; + unsigned int index; + unsigned int len; +}; + typedef struct _saxreader { IVBSAXXMLReader IVBSAXXMLReader_iface; @@ -64,6 +71,7 @@ typedef struct _saxreader struct IVBSAXDeclHandler *vbdeclHandler; xmlSAXHandler sax; BOOL isParsing; + struct bstrpool pool; } saxreader; typedef struct _saxlocator @@ -164,6 +172,45 @@ static int namespacePop(saxlocator *locator) return locator->nsStack[--locator->nsStackLast]; } +static BOOL bstr_pool_insert(struct bstrpool *pool, BSTR pool_entry) +{ + if (!pool->pool) + { + pool->pool = HeapAlloc(GetProcessHeap(), 0, 16 * sizeof(*pool->pool)); + if (!pool->pool) + return FALSE; + + pool->index = 0; + pool->len = 16; + } + else if (pool->index == pool->len) + { + BSTR *realloc = HeapReAlloc(GetProcessHeap(), 0, pool->pool, pool->len * 2 * sizeof(*realloc)); + + if (!realloc) + return FALSE; + + pool->pool = realloc; + pool->len *= 2; + } + + pool->pool[pool->index++] = pool_entry; + return TRUE; +} + +static void free_bstr_pool(struct bstrpool *pool) +{ + unsigned int i; + + for (i = 0; i < pool->index; i++) + SysFreeString(pool->pool[i]); + + HeapFree(GetProcessHeap(), 0, pool->pool); + + pool->pool = NULL; + pool->index = pool->len = 0; +} + static BSTR bstr_from_xmlCharN(const xmlChar *buf, int len) { DWORD dLen; @@ -200,6 +247,45 @@ static BSTR QName_from_xmlChar(const xmlChar *prefix, const xmlChar *name) return bstr; } +static BSTR pooled_bstr_from_xmlChar(struct bstrpool *pool, const xmlChar *buf) +{ + BSTR pool_entry = bstr_from_xmlChar(buf); + + if (pool_entry && !bstr_pool_insert(pool, pool_entry)) + { + SysFreeString(pool_entry); + return NULL; + } + + return pool_entry; +} + +static BSTR pooled_bstr_from_xmlCharN(struct bstrpool *pool, const xmlChar *buf, int len) +{ + BSTR pool_entry = bstr_from_xmlCharN(buf, len); + + if (pool_entry && !bstr_pool_insert(pool, pool_entry)) + { + SysFreeString(pool_entry); + return NULL; + } + + return pool_entry; +} + +static BSTR pooled_QName_from_xmlChar(struct bstrpool *pool, const xmlChar *prefix, const xmlChar *name) +{ + BSTR pool_entry = QName_from_xmlChar(prefix, name); + + if (pool_entry && !bstr_pool_insert(pool, pool_entry)) + { + SysFreeString(pool_entry); + return NULL; + } + + return pool_entry; +} + static void format_error_message_from_id(saxlocator *This, HRESULT hr) { xmlStopParser(This->pParserCtxt); @@ -1021,8 +1107,8 @@ static void libxmlStartElementNS( { for(index=0; index<nb_namespaces; index++) { - Prefix = bstr_from_xmlChar(namespaces[2*index]); - Uri = bstr_from_xmlChar(namespaces[2*index+1]); + Prefix = pooled_bstr_from_xmlChar(&This->saxreader->pool, namespaces[2*index]); + Uri = pooled_bstr_from_xmlChar(&This->saxreader->pool, namespaces[2*index+1]); if(This->vbInterface) hr = IVBSAXContentHandler_startPrefixMapping( @@ -1034,9 +1120,6 @@ static void libxmlStartElementNS( Prefix, SysStringLen(Prefix), Uri, SysStringLen(Uri)); - SysFreeString(Prefix); - SysFreeString(Uri); - if(hr != S_OK) { format_error_message_from_id(This, hr); @@ -1044,9 +1127,9 @@ static void libxmlStartElementNS( } } - NamespaceUri = bstr_from_xmlChar(URI); - LocalName = bstr_from_xmlChar(localname); - QName = QName_from_xmlChar(prefix, localname); + NamespaceUri = pooled_bstr_from_xmlChar(&This->saxreader->pool, URI); + LocalName = pooled_bstr_from_xmlChar(&This->saxreader->pool, localname); + QName = pooled_QName_from_xmlChar(&This->saxreader->pool, prefix, localname); hr = SAXAttributes_create(&attr, nb_namespaces, namespaces, nb_attributes, attributes); if(hr == S_OK) @@ -1061,10 +1144,6 @@ static void libxmlStartElementNS( ISAXAttributes_Release(&attr->ISAXAttributes_iface); } - - SysFreeString(NamespaceUri); - SysFreeString(LocalName); - SysFreeString(QName); } if(hr != S_OK) @@ -1094,9 +1173,9 @@ static void libxmlEndElementNS( if(has_content_handler(This)) { - NamespaceUri = bstr_from_xmlChar(URI); - LocalName = bstr_from_xmlChar(localname); - QName = QName_from_xmlChar(prefix, localname); + NamespaceUri = pooled_bstr_from_xmlChar(&This->saxreader->pool, URI); + LocalName = pooled_bstr_from_xmlChar(&This->saxreader->pool, localname); + QName = pooled_QName_from_xmlChar(&This->saxreader->pool, prefix, localname); if(This->vbInterface) hr = IVBSAXContentHandler_endElement( @@ -1109,10 +1188,6 @@ static void libxmlEndElementNS( LocalName, SysStringLen(LocalName), QName, SysStringLen(QName)); - SysFreeString(NamespaceUri); - SysFreeString(LocalName); - SysFreeString(QName); - if(hr != S_OK) { format_error_message_from_id(This, hr); @@ -1122,7 +1197,7 @@ static void libxmlEndElementNS( for(index=This->pParserCtxt->nsNr-2; index>=This->pParserCtxt->nsNr-nsNr*2; index-=2) { - Prefix = bstr_from_xmlChar(This->pParserCtxt->nsTab[index]); + Prefix = pooled_bstr_from_xmlChar(&This->saxreader->pool, This->pParserCtxt->nsTab[index]); if(This->vbInterface) hr = IVBSAXContentHandler_endPrefixMapping( @@ -1132,8 +1207,6 @@ static void libxmlEndElementNS( This->saxreader->contentHandler, Prefix, SysStringLen(Prefix)); - SysFreeString(Prefix); - if(hr != S_OK) { format_error_message_from_id(This, hr); @@ -1178,7 +1251,7 @@ static void libxmlCharacters( if(!lastEvent) *end = '\n'; - Chars = bstr_from_xmlCharN(cur, end-cur+1); + Chars = pooled_bstr_from_xmlCharN(&This->saxreader->pool, cur, end-cur+1); if(This->vbInterface) hr = IVBSAXContentHandler_characters( This->saxreader->vbcontentHandler, &Chars); @@ -1186,7 +1259,6 @@ static void libxmlCharacters( hr = ISAXContentHandler_characters( This->saxreader->contentHandler, Chars, SysStringLen(Chars)); - SysFreeString(Chars); if(hr != S_OK) { @@ -1251,7 +1323,7 @@ static void libxmlComment(void *ctx, const xmlChar *value) if(!This->vbInterface && !This->saxreader->lexicalHandler) return; if(This->vbInterface && !This->saxreader->vblexicalHandler) return; - bValue = bstr_from_xmlChar(value); + bValue = pooled_bstr_from_xmlChar(&This->saxreader->pool, value); if(This->vbInterface) hr = IVBSAXLexicalHandler_comment( @@ -1261,8 +1333,6 @@ static void libxmlComment(void *ctx, const xmlChar *value) This->saxreader->lexicalHandler, bValue, SysStringLen(bValue)); - SysFreeString(bValue); - if(FAILED(hr)) format_error_message_from_id(This, hr); @@ -1363,7 +1433,7 @@ static void libxmlCDataBlock(void *ctx, const xmlChar *value, int len) if(has_content_handler(This)) { - Chars = bstr_from_xmlCharN(cur, end-cur+1); + Chars = pooled_bstr_from_xmlCharN(&This->saxreader->pool, cur, end-cur+1); if(This->vbInterface) hr = IVBSAXContentHandler_characters( This->saxreader->vbcontentHandler, &Chars); @@ -1371,7 +1441,6 @@ static void libxmlCDataBlock(void *ctx, const xmlChar *value, int len) hr = ISAXContentHandler_characters( This->saxreader->contentHandler, Chars, SysStringLen(Chars)); - SysFreeString(Chars); } if(change) *end = '\r'; @@ -1998,6 +2067,9 @@ static HRESULT internal_parse( TRACE("(%p)->(%s)\n", This, debugstr_variant(&varInput)); + /* Dispose of the BSTRs in the pool from a prior run, if any. */ + free_bstr_pool(&This->pool); + switch(V_VT(&varInput)) { case VT_BSTR: @@ -2320,6 +2392,8 @@ static ULONG WINAPI saxxmlreader_Release( if(This->vbdeclHandler) IVBSAXDeclHandler_Release(This->vbdeclHandler); + free_bstr_pool(&This->pool); + heap_free( This ); } @@ -2817,6 +2891,9 @@ HRESULT SAXXMLReader_create(IUnknown *pUnkOuter, LPVOID *ppObj) reader->declHandler = NULL; reader->vbdeclHandler = NULL; reader->isParsing = FALSE; + reader->pool.pool = NULL; + reader->pool.index = 0; + reader->pool.len = 0; memset(&reader->sax, 0, sizeof(xmlSAXHandler)); reader->sax.initialized = XML_SAX2_MAGIC;
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Alexandre Julliard