[sqlite] Backport icuCaseFunc16 patch from SQLite.

third_party/sqlite/patches/0013-icu-Fix-buffer-overflow-when-case-mapping-expands-to.patch

-From e2beb15e5092bd882ba261e403daf76ef1b26456 Mon Sep 17 00:00:00 2001
-From: Scott Hess <shess@chromium.org>
-Date: Fri, 26 Feb 2016 10:49:33 -0800
-Subject: [PATCH 13/13] [icu] Fix buffer overflow when case mapping expands too
- far.
-
-Previously the buffer was doubled in size to accomodate cases where the
-case-mapped version was larger, but some cases expand by more than
-double.  Detect U_BUFFER_OVERFLOW_ERROR and expand to the provided size.
-
-Original Chromium checkin:
-https://codereview.chromium.org/1704103002
----
- third_party/sqlite/src/ext/icu/icu.c | 31 +++++++++++++++++++++++++------
- third_party/sqlite/src/test/icu.test |  7 +++++++
- 2 files changed, 32 insertions(+), 6 deletions(-)
-
-diff --git a/third_party/sqlite/src/ext/icu/icu.c b/third_party/sqlite/src/ext/icu/icu.c
-index 7e2b800..d384f71 100644
---- a/third_party/sqlite/src/ext/icu/icu.c
-+++ b/third_party/sqlite/src/ext/icu/icu.c
-@@ -341,26 +341,45 @@ static void icuCaseFunc16(sqlite3_context *p, int nArg, sqlite3_value **apArg){
-   if( !zInput ){
-     return;
-   }
--  nInput = sqlite3_value_bytes16(apArg[0]);
-+  nOutput = nInput = sqlite3_value_bytes16(apArg[0]);
- 
--  nOutput = nInput * 2 + 2;
-   zOutput = sqlite3_malloc(nOutput);
-   if( !zOutput ){
-     return;
-   }
- 
-   if( sqlite3_user_data(p) ){
--    u_strToUpper(zOutput, nOutput/2, zInput, nInput/2, zLocale, &status);
-+    nOutput = u_strToUpper(
-+        zOutput, nOutput/2, zInput, nInput/2, zLocale, &status) * 2;
-   }else{
--    u_strToLower(zOutput, nOutput/2, zInput, nInput/2, zLocale, &status);
-+    nOutput = u_strToLower(
-+        zOutput, nOutput/2, zInput, nInput/2, zLocale, &status) * 2;
-   }
- 
--  if( !U_SUCCESS(status) ){
-+  if ( status == U_BUFFER_OVERFLOW_ERROR ) {
-+    UChar* newOutput = sqlite3_realloc(zOutput, nOutput);
-+    if( !newOutput ){
-+      sqlite3_free(zOutput);
-+      return;
-+    }
-+    zOutput = newOutput;
-+    status = U_ZERO_ERROR;
-+    if( sqlite3_user_data(p) ){
-+      nOutput = u_strToUpper(
-+          zOutput, nOutput/2, zInput, nInput/2, zLocale, &status) * 2;
-+    }else{
-+      nOutput = u_strToLower(
-+          zOutput, nOutput/2, zInput, nInput/2, zLocale, &status) * 2;
-+    }
-+  }
-+
-+  if( U_FAILURE(status) ){
-     icuFunctionError(p, "u_strToLower()/u_strToUpper", status);
-+    sqlite3_free(zOutput);
-     return;
-   }
- 
--  sqlite3_result_text16(p, zOutput, -1, xFree);
-+  sqlite3_result_text16(p, zOutput, nOutput, xFree);
- }
- 
- /*
-diff --git a/third_party/sqlite/src/test/icu.test b/third_party/sqlite/src/test/icu.test
-index 73cb9b9..22948aa 100644
---- a/third_party/sqlite/src/test/icu.test
-+++ b/third_party/sqlite/src/test/icu.test
-@@ -56,6 +56,10 @@ set ::ograve "\xF2"
- #
- set ::szlig "\xDF" 
- 
-+# U+FB03 (ffi ligature) and U+FB04 (ffl ligature). They're uppercased
-+# to 'FFI' and 'FFL'.
-+set ::ffi_ffl "\ufb03\ufb04"
-+
- # Tests of the upper()/lower() functions.
- #
- test_expr icu-2.1 {i1='HellO WorlD'} {upper(i1)} {HELLO WORLD}
-@@ -72,6 +76,9 @@ test_expr icu-2.6 {i1=$::OGRAVE} {upper(i1)}     $::OGRAVE
- test_expr icu-2.7 {i1=$::szlig} {upper(i1)}      "SS"
- test_expr icu-2.8 {i1='SS'} {lower(i1)}          "ss"
- 
-+test_expr icu-2.9 {i1=$::ffi_ffl} {upper(i1)}      "FFIFFL"
-+test_expr icu-2.10 {i1=$::ffi_ffl} {lower(i1)}      $::ffi_ffl
-+
- # In turkish (locale="tr_TR"), the lower case version of I
- # is "small dotless i" (code point 0x131 (decimal 305)).
- #
--- 
-2.7.0
-