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8217093: Support extended-length paths in parse_manifest.c on windows

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Reviewed-by: chegar, clanger
This commit is contained in:
Matthias Baesken 2019-01-28 16:42:23 +01:00
parent 13a52f3a17
commit 38463aa959
3 changed files with 64 additions and 7 deletions
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55
src/java.base/windows/native/libjli/java_md.c
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -41,6 +41,8 @@
#define JVM_DLL "jvm.dll"
#define JAVA_DLL "java.dll"
#define ELP_PREFIX L"\\\\?\\"
/*
* Prototypes.
*/
@ -495,6 +497,57 @@ JLI_Snprintf(char* buffer, size_t size, const char* format, ...) {
return rc;
}
/* On Windows, if _open fails, retry again with CreateFileW and
* "\\?\" prefix ( extended-length paths) - this allows to open paths with larger file names;
* otherwise we run into the MAX_PATH limitation */
int JLI_Open(const char* name, int flags) {
int fd = _open(name, flags);
if (fd == -1 && errno == ENOENT) {
wchar_t* wname = NULL;
wchar_t* wfullname = NULL;
wchar_t* wfullname_w_prefix = NULL;
size_t wnamelen, wfullnamelen, elplen;
HANDLE h;
wnamelen = strlen(name) + 1;
wname = (wchar_t*) malloc(wnamelen*sizeof(wchar_t));
if (wname == NULL) {
goto end;
}
if (mbstowcs(wname, name, wnamelen - 1) == -1) {
goto end;
}
wname[wnamelen - 1] = L'\0';
wfullname = _wfullpath(wfullname, wname, 0);
if (wfullname == NULL) {
goto end;
}
wfullnamelen = wcslen(wfullname);
if (wfullnamelen > 247) {
elplen = wcslen(ELP_PREFIX);
wfullname_w_prefix = (wchar_t*) malloc((elplen+wfullnamelen+1)*sizeof(wchar_t));
wcscpy(wfullname_w_prefix, ELP_PREFIX);
wcscpy(wfullname_w_prefix+elplen, wfullname);
h = CreateFileW(wfullname_w_prefix, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (h == INVALID_HANDLE_VALUE) {
goto end;
}
/* associates fd with handle */
fd = _open_osfhandle((intptr_t)h, _O_RDONLY);
}
end:
free(wname);
free(wfullname);
free(wfullname_w_prefix);
}
return fd;
}
JNIEXPORT void JNICALL
JLI_ReportErrorMessage(const char* fmt, ...) {
va_list vl;