[2.7] bpo-1104: msilib.SummaryInfo.GetProperty() truncates the string by one character (GH-4517) (GH-11749)

Add one char to MsiSummaryInfoGetProperty() output
Based on the patch in [bpo-1104](https://bugs.python.org/issue1104) by Anthony Tuininga (atuining) and Mark McMahon (markm)
(cherry picked from commit 2de576e16d42ce43698d384d0dd46ba6cf165424)

Co-authored-by: Tzu-ping Chung <uranusjr@gmail.com>





https://bugs.python.org/issue1104

3 files changed, 67 insertions, 13 deletions

diff --git a/Lib/test/test_msilib.py b/Lib/test/test_msilib.py
index 5d5b0c4..a2f3943 100644
--- a/Lib/test/test_msilib.py
+++ b/Lib/test/test_msilib.py
@@ -1,8 +1,48 @@
 """ Test suite for the code in msilib """
 import unittest
-import os
-from test_support import run_unittest, import_module
+from test_support import TESTFN, import_module, run_unittest, unlink
 msilib = import_module('msilib')
+import msilib.schema
+
+
+def init_database():
+    path = TESTFN + '.msi'
+    db = msilib.init_database(
+        path,
+        msilib.schema,
+        'Python Tests',
+        'product_code',
+        '1.0',
+        'PSF',
+    )
+    return db, path
+
+
+class MsiDatabaseTestCase(unittest.TestCase):
+
+    def test_summaryinfo_getproperty_issue1104(self):
+        db, db_path = init_database()
+        try:
+            sum_info = db.GetSummaryInformation(99)
+            title = sum_info.GetProperty(msilib.PID_TITLE)
+            self.assertEqual(title, b"Installation Database")
+
+            sum_info.SetProperty(msilib.PID_TITLE, "a" * 999)
+            title = sum_info.GetProperty(msilib.PID_TITLE)
+            self.assertEqual(title, b"a" * 999)
+
+            sum_info.SetProperty(msilib.PID_TITLE, "a" * 1000)
+            title = sum_info.GetProperty(msilib.PID_TITLE)
+            self.assertEqual(title, b"a" * 1000)
+
+            sum_info.SetProperty(msilib.PID_TITLE, "a" * 1001)
+            title = sum_info.GetProperty(msilib.PID_TITLE)
+            self.assertEqual(title, b"a" * 1001)
+        finally:
+            db = None
+            sum_info = None
+            unlink(db_path)
+
 
 class Test_make_id(unittest.TestCase):
     #http://msdn.microsoft.com/en-us/library/aa369212(v=vs.85).aspx
@@ -35,12 +75,13 @@ class Test_make_id(unittest.TestCase):
     def test_invalid_any_char(self):
         self.assertEqual(
             msilib.make_id(".s\x82ort"), "_.s_ort")
-        self.assertEqual    (
+        self.assertEqual(
             msilib.make_id(".s\x82o?*+rt"), "_.s_o___rt")
 
 
 def test_main():
     run_unittest(__name__)
 
+
 if __name__ == '__main__':
     test_main()
diff --git a/Misc/NEWS.d/next/Windows/2017-11-24-12-53-54.bpo-1104.1CWSZp.rst b/Misc/NEWS.d/next/Windows/2017-11-24-12-53-54.bpo-1104.1CWSZp.rst
new file mode 100644
index 0000000..a404349
--- /dev/null
+++ b/Misc/NEWS.d/next/Windows/2017-11-24-12-53-54.bpo-1104.1CWSZp.rst
@@ -0,0 +1,2 @@
+Correctly handle string length in ``msilib.SummaryInfo.GetProperty()`` to
+prevent it from truncating the last character.
diff --git a/PC/_msi.c b/PC/_msi.c
index 68c4e79..4000f00 100644
--- a/PC/_msi.c
+++ b/PC/_msi.c
@@ -539,7 +539,7 @@ summary_getproperty(msiobj* si, PyObject *args)
     FILETIME fval;
     char sbuf[1000];
     char *sval = sbuf;
-    DWORD ssize = sizeof(sval);
+    DWORD ssize = sizeof(sbuf);
 
     if (!PyArg_ParseTuple(args, "i:GetProperty", &field))
         return NULL;
@@ -547,6 +547,7 @@ summary_getproperty(msiobj* si, PyObject *args)
     status = MsiSummaryInfoGetProperty(si->h, field, &type, &ival,
         &fval, sval, &ssize);
     if (status == ERROR_MORE_DATA) {
+        ssize++;
         sval = malloc(ssize);
         if (sval == NULL) {
             return PyErr_NoMemory();
@@ -556,19 +557,29 @@ summary_getproperty(msiobj* si, PyObject *args)
     }
 
     switch(type) {
-        case VT_I2: case VT_I4:
-            return PyInt_FromLong(ival);
+        case VT_I2:
+        case VT_I4:
+            result = PyLong_FromLong(ival);
+            break;
         case VT_FILETIME:
             PyErr_SetString(PyExc_NotImplementedError, "FILETIME result");
-            return NULL;
+            result = NULL;
+            break;
         case VT_LPSTR:
-            result = PyString_FromStringAndSize(sval, ssize);
-            if (sval != sbuf)
-                free(sval);
-            return result;
+            result = PyBytes_FromStringAndSize(sval, ssize);
+            break;
+        case VT_EMPTY:
+            Py_INCREF(Py_None);
+            result = Py_None;
+            break;
+        default:
+            PyErr_Format(PyExc_NotImplementedError, "result of type %d", type);
+            result = NULL;
+            break;
     }
-    PyErr_Format(PyExc_NotImplementedError, "result of type %d", type);
-    return NULL;
+    if (sval != sbuf)
+        free(sval);
+    return result;
 }
 
 static PyObject*