From 6388ac81baddbda2cd522c108ff21c3462394035 Mon Sep 17 00:00:00 2001
From: Sebastian Philipp <sebastian.philipp@teamdrive.com>
Date: Tue, 28 Jul 2015 10:51:16 +0200
Subject: [PATCH] add UTF16 and UTF16CI collation

UTF16 = Case sensitive compare
UTF16CI = Case insensitive compare

comparison is performed by QString functions
---
 src/sqlitedb.cpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/sqlitedb.cpp b/src/sqlitedb.cpp
index 3394864b..dbc3ac60 100644
--- a/src/sqlitedb.cpp
+++ b/src/sqlitedb.cpp
@@ -22,6 +22,22 @@ int collCompare(void* /*pArg*/, int /*eTextRepA*/, const void* sA, int /*eTextRe
     return sizeA - sizeB;
 }
 
+static int sqlite_compare_utf16( void* /*arg*/,int size1, const void *str1, int size2, const void* str2)
+{
+    const QString string1 = QString::fromRawData(reinterpret_cast<const QChar*>(str1), size1 / sizeof(QChar));
+    const QString string2 = QString::fromRawData(reinterpret_cast<const QChar*>(str2), size2 / sizeof(QChar));
+
+    return QString::compare(string1, string2, Qt::CaseSensitive);
+}
+
+static int sqlite_compare_utf16ci( void* /*arg*/,int size1, const void *str1, int size2, const void* str2)
+{
+    const QString string1 = QString::fromRawData(reinterpret_cast<const QChar*>(str1), size1 / sizeof(QChar));
+    const QString string2 = QString::fromRawData(reinterpret_cast<const QChar*>(str2), size2 / sizeof(QChar));
+
+    return QString::compare(string1, string2, Qt::CaseInsensitive);
+}
+
 void collation_needed(void* /*pData*/, sqlite3* db, int eTextRep, const char* sCollationName)
 {
     QMessageBox::StandardButton reply = QMessageBox::question(
@@ -99,6 +115,11 @@ bool DBBrowserDB::open(const QString& db)
 
     if (_db)
     {
+        // add UTF16 collation (comparison is performed by QString functions)
+        sqlite3_create_collation(_db, "UTF16", SQLITE_UTF16, 0, sqlite_compare_utf16);
+        // add UTF16CI (case insensitive) collation (comparison is performed by QString functions)
+        sqlite3_create_collation(_db, "UTF16CI", SQLITE_UTF16, 0, sqlite_compare_utf16ci);
+       
         // register collation callback
         sqlite3_collation_needed(_db, NULL, collation_needed);