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Support long path names on WNT

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so we've got this patch to libxml2 2.7.6 in the LibreOffice code base,
inherited from OOo.  it fixes a definite problem, which is that Windows
has a rather low maximum path length restriction, and there is a special
trick on NT whereby path names can be prefixed with "\\?\", in which
case the maximum length is 32k, which ought to be sufficient even for
bloated office suites :)

I'll attach the patch to the xmlCanonicPath function.  note that i
didn't write this and am by no means an expert on either Microsoftean
platforms or libxml so maybe it's not the best way to do it.
This commit is contained in:
Michael Stahl 2012-09-07 12:14:00 +08:00 committed by Daniel Veillard
parent 1bd45d1309
commit 55b899a23a
2 changed files with 25 additions and 4 deletions
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15
uri.c
View File

@ -2397,7 +2397,20 @@ xmlCanonicPath(const xmlChar *path)
if (path == NULL)
return(NULL);
/* sanitize filename starting with // so it can be used as URI */
#if defined(_WIN32)
/*
* We must not change the backslashes to slashes if the the path
* starts with \\?\
* Those paths can be up to 32k characters long.
* Was added specifically for OpenOffice, those paths can't be converted
* to URIs anyway.
*/
if ((path[0] == '\\') && (path[1] == '\\') && (path[2] == '?') &&
(path[3] == '\\') )
return xmlStrdup((const xmlChar *) path);
#endif
/* sanitize filename starting with // so it can be used as URI */
if ((path[0] == '/') && (path[1] == '/') && (path[2] != '/'))
path++;

14
xmlIO.c
View File

@ -771,13 +771,21 @@ int
xmlCheckFilename (const char *path)
{
#ifdef HAVE_STAT
struct stat stat_buffer;
struct stat stat_buffer;
#endif
if (path == NULL)
return(0);
if (path == NULL)
return(0);
#ifdef HAVE_STAT
#if defined(_WIN32) || defined (__DJGPP__) && !defined (__CYGWIN__)
/*
* On Windows stat and wstat do not work with long pathname,
* which start with '\\?\'
*/
if ((path[0] == '\\') && (path[1] == '\\') && (path[2] == '?') &&
(path[3] == '\\') )
return 1;
if (xmlWrapStat(path, &stat_buffer) == -1)
return 0;
#else