Re: Implementation of GetCompressedFileSize[AW]

[Pavel Roskin <proski@gnu.org>]

On Wed, 1 Oct 2003, Pavel Roskin wrote:

> FIXME about GetCompressedFileSizeA was too annoying when running Cygwin
> programs, so I implemented it.  The code uses st_blocks when possible to
> account for sparse files and falls back to st_size if st_blocks is missing
> in struct stat.  The code uses shift operations so that both systems with
> 32-bit and 64-bit off_t will do their best to provide accurate results.

Sorry, the previous patch contained unrelated parts.  Corrected patch is
attached.

-- 
Regards,
Pavel Roskin

--- configure.ac
+++ configure.ac
@@ -1327,6 +1327,9 @@
 #include <getopt.h>
 #endif])
 
+dnl Check for stat.st_blocks
+AC_STRUCT_ST_BLOCKS
+
 dnl *** check for the need to define platform-specific symbols
 
 case $host_cpu in
--- win32/newfns.c
+++ win32/newfns.c
@@ -33,6 +33,9 @@ at a later date. */
 #ifdef HAVE_UNISTD_H
 # include <unistd.h>
 #endif
+#ifdef HAVE_SYS_STAT_H
+# include <sys/stat.h>
+#endif
 
 #define NONAMELESSUNION
 #define NONAMELESSSTRUCT
@@ -41,22 +44,22 @@ at a later date. */
 #include "winnls.h"
 #include "winerror.h"
 #include "wine/debug.h"
+#include "file.h"
 
 WINE_DEFAULT_DEBUG_CHANNEL(win32);
 
 
 /******************************************************************************
  * GetCompressedFileSizeA [KERNEL32.@]
- *
- * NOTES
- *    This should call the W function below
  */
 DWORD WINAPI GetCompressedFileSizeA(
     LPCSTR lpFileName,
     LPDWORD lpFileSizeHigh)
 {
-    FIXME("(...): stub\n");
-    return 0xffffffff;
+    WCHAR fileW[MAX_PATHNAME_LEN];
+
+    MultiByteToWideChar(CP_ACP, 0, lpFileName, -1, fileW, MAX_PATHNAME_LEN);
+    return GetCompressedFileSizeW( fileW, lpFileSizeHigh );
 }
 
 
@@ -71,8 +74,27 @@ DWORD WINAPI GetCompressedFileSizeW(
     LPCWSTR lpFileName,     /* [in]  Pointer to name of file */
     LPDWORD lpFileSizeHigh) /* [out] Receives high-order doubleword of size */
 {
-    FIXME("(%s,%p): stub\n",debugstr_w(lpFileName),lpFileSizeHigh);
-    return 0xffffffff;
+    DOS_FULL_NAME full_name;
+    struct stat st;
+    DWORD low;
+
+    TRACE("(%s,%p)\n",debugstr_w(lpFileName),lpFileSizeHigh);
+    if ((lpFileName == NULL) ||
+        (!DOSFS_GetFullName( lpFileName, TRUE, &full_name )) ||
+        (stat(full_name.long_name, &st) != 0))
+    {
+        SetLastError( ERROR_INVALID_PARAMETER );
+        return 0xffffffff;
+    }
+#if HAVE_STRUCT_STAT_ST_BLOCKS
+    /* blocks are 512 bytes long */
+    *lpFileSizeHigh = (st.st_blocks >> 23);
+    low = ((st.st_blocks << 9) & 0xffffffff);
+#else
+    *lpFileSizeHigh = (st.st_size >> 32);
+    low = (st.st_size & 0xffffffff);
+#endif
+    return low;
 }