[PATCH 4/9] msi: Add support for exporting binary streams (Binary/Icon tables).

[Hans Leidekker]

From: "Erich E. Hoover" <erich.e.hoover at gmail.com>

The Binary and Icon tables store their data in a different format from
other tables, one column of the data is stored as a "stream" instead
of a normal text field.  With this patch those tables can now be
exported properly by the MSI export functionality.

v2: Avoid fixed size path buffers.

Signed-off-by: Erich E. Hoover <erich.e.hoover at gmail.com>
Signed-off-by: Hans Leidekker <hans at codeweavers.com>
---
 dlls/msi/database.c | 85 +++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 79 insertions(+), 6 deletions(-)

diff --git a/dlls/msi/database.c b/dlls/msi/database.c
index f302610771..4537ed5836 100644
--- a/dlls/msi/database.c
+++ b/dlls/msi/database.c
@@ -961,8 +961,68 @@ static UINT msi_export_field( HANDLE handle, MSIRECORD *row, UINT field )
     return ret ? ERROR_SUCCESS : ERROR_FUNCTION_FAILED;
 }
 
-static UINT msi_export_record( HANDLE handle, MSIRECORD *row, UINT start )
+static UINT msi_export_stream( const WCHAR *folder, const WCHAR *table, MSIRECORD *row, UINT field, UINT start )
 {
+    static const WCHAR fmt[] = {'%','s','\\','%','s',0};
+    WCHAR stream[MAX_STREAM_NAME_LEN + 1], *path;
+    DWORD sz, read_size, write_size;
+    char buffer[1024];
+    HANDLE file;
+    UINT len, r;
+
+    sz = ARRAY_SIZE( stream );
+    r = MSI_RecordGetStringW( row, start, stream, &sz );
+    if (r != ERROR_SUCCESS)
+        return r;
+
+    len = (sz + strlenW( folder ) + strlenW( table ) + ARRAY_SIZE( fmt ) + 1) * sizeof(WCHAR);
+    if (!(path = msi_alloc( len )))
+        return ERROR_OUTOFMEMORY;
+
+    len = sprintfW( path, fmt, folder, table );
+    if (!CreateDirectoryW( path, NULL ) && GetLastError() != ERROR_ALREADY_EXISTS)
+    {
+        msi_free( path );
+        return ERROR_FUNCTION_FAILED;
+    }
+
+    path[len++] = '\\';
+    strcpyW( path + len, stream );
+    file = CreateFileW( path, GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE,
+                        NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL );
+    msi_free( path );
+    if (file == INVALID_HANDLE_VALUE)
+        return ERROR_FUNCTION_FAILED;
+
+    read_size = sizeof(buffer);
+    while (read_size == sizeof(buffer))
+    {
+        r = MSI_RecordReadStream( row, field, buffer, &read_size );
+        if (r != ERROR_SUCCESS)
+        {
+            CloseHandle( file );
+            return r;
+        }
+        if (!WriteFile( file, buffer, read_size, &write_size, NULL ) || read_size != write_size)
+        {
+            CloseHandle( file );
+            return ERROR_WRITE_FAULT;
+        }
+    }
+    CloseHandle( file );
+    return r;
+}
+
+struct row_export_info
+{
+    HANDLE       handle;
+    const WCHAR *folder;
+    const WCHAR *table;
+};
+
+static UINT msi_export_record( struct row_export_info *row_export_info, MSIRECORD *row, UINT start )
+{
+    HANDLE handle = row_export_info->handle;
     UINT i, count, r = ERROR_SUCCESS;
     const char *sep;
     DWORD sz;
@@ -971,7 +1031,18 @@ static UINT msi_export_record( HANDLE handle, MSIRECORD *row, UINT start )
     for (i = start; i <= count; i++)
     {
         r = msi_export_field( handle, row, i );
-        if (r != ERROR_SUCCESS)
+        if (r == ERROR_INVALID_PARAMETER)
+        {
+            r = msi_export_stream( row_export_info->folder, row_export_info->table, row, i, start );
+            if (r != ERROR_SUCCESS)
+                return r;
+
+            /* exporting a binary stream, repeat the "Name" field */
+            r = msi_export_field( handle, row, start );
+            if (r != ERROR_SUCCESS)
+                return r;
+        }
+        else if (r != ERROR_SUCCESS)
             return r;
 
         sep = (i < count) ? "\t" : "\r\n";
@@ -1062,11 +1133,13 @@ static UINT MSI_DatabaseExport( MSIDATABASE *db, LPCWSTR table, LPCWSTR folder,
     r = MSI_OpenQuery( db, &view, query, table );
     if (r == ERROR_SUCCESS)
     {
+        struct row_export_info row_export_info = { handle, folder, table };
+
         /* write out row 1, the column names */
         r = MSI_ViewGetColumnInfo(view, MSICOLINFO_NAMES, &rec);
         if (r == ERROR_SUCCESS)
         {
-            msi_export_record( handle, rec, 1 );
+            msi_export_record( &row_export_info, rec, 1 );
             msiobj_release( &rec->hdr );
         }
 
@@ -1074,7 +1147,7 @@ static UINT MSI_DatabaseExport( MSIDATABASE *db, LPCWSTR table, LPCWSTR folder,
         r = MSI_ViewGetColumnInfo(view, MSICOLINFO_TYPES, &rec);
         if (r == ERROR_SUCCESS)
         {
-            msi_export_record( handle, rec, 1 );
+            msi_export_record( &row_export_info, rec, 1 );
             msiobj_release( &rec->hdr );
         }
 
@@ -1083,12 +1156,12 @@ static UINT MSI_DatabaseExport( MSIDATABASE *db, LPCWSTR table, LPCWSTR folder,
         if (r == ERROR_SUCCESS)
         {
             MSI_RecordSetStringW( rec, 0, table );
-            msi_export_record( handle, rec, 0 );
+            msi_export_record( &row_export_info, rec, 0 );
             msiobj_release( &rec->hdr );
         }
 
         /* write out row 4 onwards, the data */
-        r = MSI_IterateRecords( view, 0, msi_export_row, handle );
+        r = MSI_IterateRecords( view, 0, msi_export_row, &row_export_info );
         msiobj_release( &view->hdr );
     }
 
-- 
2.20.1