Implement Win32 MMAP support.

git-svn-id: http://svn.apache.org/repos/asf/apr/apr/trunk@60912 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 165 insertions, 0 deletions

diff --git a/mmap/win32/mmap.c b/mmap/win32/mmap.c
new file mode 100644
index 000000000..6e66e8800
--- /dev/null
+++ b/mmap/win32/mmap.c
@@ -0,0 +1,165 @@
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2000 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution,
+ *    if any, must include the following acknowledgment:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgment may appear in the software itself,
+ *    if and wherever such third-party acknowledgments normally appear.
+ *
+ * 4. The names "Apache" and "Apache Software Foundation" must
+ *    not be used to endorse or promote products derived from this
+ *    software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache",
+ *    nor may "Apache" appear in their name, without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+
+#include "apr.h"
+#include "apr_private.h"
+#include "apr_general.h"
+#include "apr_mmap.h"
+#include "apr_errno.h"
+#include "fileio.h"
+#include "apr_portable.h"
+
+#if APR_HAS_MMAP
+
+static apr_status_t mmap_cleanup(void *themmap)
+{
+    apr_mmap_t *mm = themmap;
+    apr_status_t rv = 0;
+    if (mm->mv) {
+        if (!UnmapViewOfFile(mm->mv))
+        {
+            apr_status_t rv = apr_get_os_error();
+            CloseHandle(mm->mhandle);
+            mm->mv = NULL;
+            mm->mhandle = NULL;
+            return rv;
+        }
+        mm->mv = NULL;
+    }
+    if (mm->mhandle) 
+    {
+        if (!CloseHandle(mm->mhandle))
+        {
+            apr_status_t rv = apr_get_os_error();
+            CloseHandle(mm->mhandle);
+            mm->mhandle = NULL;
+            return rv;
+        }
+        mm->mhandle = NULL;
+    }
+    return APR_SUCCESS;
+}
+
+apr_status_t apr_mmap_create(apr_mmap_t **new, apr_file_t *file, apr_off_t offset, 
+                             apr_size_t size, apr_int32_t flag, apr_pool_t *cont)
+{
+    static DWORD memblock = 0;
+    DWORD fmaccess = 0, mvaccess = 0;
+
+    if (flag & APR_MMAP_WRITE)
+        fmaccess |= PAGE_READWRITE;
+    else if (flag & APR_MMAP_READ)
+        fmaccess |= PAGE_READONLY;
+
+    if (flag & APR_MMAP_READ)
+        mvaccess |= FILE_MAP_READ;
+    if (flag & APR_MMAP_WRITE)
+        mvaccess |= FILE_MAP_WRITE;
+
+    if (!file || !file->filehand || file->filehand == INVALID_HANDLE_VALUE
+        || file->buffered)
+        return APR_EBADF;
+
+    if (!memblock)
+    {
+        SYSTEM_INFO si;
+        GetSystemInfo(&si);
+        memblock = si.dwAllocationGranularity;
+    }   
+    
+    *new = apr_pcalloc(cont, sizeof(apr_mmap_t));
+    (*new)->pstart = (offset / memblock) * memblock;
+    (*new)->psize = (offset % memblock) + size;
+    (*new)->poffset = offset - (*new)->pstart;
+
+    (*new)->mhandle = CreateFileMapping(file->filehand, NULL, fmaccess,
+                                        0, (*new)->psize, NULL);
+    if (!(*new)->mhandle || (*new)->mhandle == INVALID_HANDLE_VALUE)
+    {
+        *new = NULL;
+        return apr_get_os_error();
+    }
+
+    (*new)->mv = MapViewOfFile((*new)->mhandle, mvaccess, 0,
+                               (*new)->poffset, (*new)->psize);
+    if (!(*new)->mv)
+    {
+        apr_status_t rv = apr_get_os_error();
+        CloseHandle((*new)->mhandle);
+        *new = NULL;
+        return rv;
+    }
+
+    (*new)->mm = (char*)((*new)->mv) + offset;
+    (*new)->size = size;
+    (*new)->cntxt = cont;
+
+    /* register the cleanup... */
+    apr_register_cleanup((*new)->cntxt, (void*)(*new), mmap_cleanup,
+                         apr_null_cleanup);
+    return APR_SUCCESS;
+}
+
+apr_status_t apr_mmap_delete(apr_mmap_t *mmap)
+{
+    apr_status_t rv;
+
+    if ((rv = mmap_cleanup(mmap)) == APR_SUCCESS) {
+        apr_kill_cleanup(mmap->cntxt, mmap, mmap_cleanup);
+        return APR_SUCCESS;
+    }
+    return rv;
+}
+
+#endif