SQLite

        || (c&0xFFFFF800)==0xD800                          \
        || (c&0xFFFFFFFE)==0xFFFE ){  c = 0xFFFD; }        \
  }
int sqlite3Utf8Read(
  const unsigned char *zIn,       /* First byte of UTF-8 character */
  const unsigned char **pzNext    /* Write first byte past UTF-8 char here */
){
  unsigned int c;

  /* Same as READ_UTF8() above but without the zTerm parameter.
  ** For this routine, we assume the UTF8 string is always zero-terminated.
  */
  c = *(zIn++);
  if( c>=0xc0 ){
    c = sqlite3Utf8Trans1[c-0xc0];

#if defined(SQLITE_TEST) && defined(SQLITE_DEBUG)
/*
** Translate UTF-8 to UTF-8.
**
** This has the effect of making sure that the string is well-formed
** UTF-8.  Miscoded characters are removed.
**
** The translation is done in-place and aborted if the output
** overruns the input.
*/
int sqlite3Utf8To8(unsigned char *zIn){
  unsigned char *zOut = zIn;
  unsigned char *zStart = zIn;
  u32 c;

  while( zIn[0] && zOut<=zIn ){
    c = sqlite3Utf8Read(zIn, (const u8**)&zIn);
    if( c!=0xfffd ){
      WRITE_UTF8(zOut, c);
    }
  }
  *zOut = 0;
  return (int)(zOut - zStart);

# 2011 March 15
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library. 
#
# This file checks to make sure SQLite is able to gracEFully
# handle malformed UTF-8.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl

proc utf8_to_ustr2 {s} {
  set r ""
  foreach i [split $s ""] {
    scan $i %c c
    append r [format \\u%04.4X $c]
  }
  set r
}

proc utf8_to_hstr {in} {
 regsub -all -- {(..)} $in {%[format "%s" \1]} out
 subst $out
}

proc utf8_to_xstr {in} {
 regsub -all -- {(..)} $in {\\\\x[format "%s" \1]} out
 subst $out
}

proc utf8_to_ustr {in} {
 regsub -all -- {(..)} $in {\\\\u[format "%04.4X" 0x\1]} out
 subst $out
}

do_test badutf2-1.0 {
  db close
  forcedelete test.db
  sqlite3 db test.db
  db eval "PRAGMA encoding = 'UTF-8'"
} {}

do_test badutf2-4.0 {
  set S [sqlite3_prepare_v2 db "SELECT ?" -1 dummy]
  sqlite3_expired $S
} {0}
        
foreach { i len uval xstr ustr u2u } {
1 1 00     \x00         {}        {}
2 1 01     \x01         "\\u0001" 01
3 1 3F     \x3F         "\\u003F" 3F
4 1 7F     \x7F         "\\u007F" 7F
5 1 80     \x80         "\\u0080" C280
6 1 C3BF   \xFF         "\\u00FF" C3BF
7 3 EFBFBD \xEF\xBF\xBD "\\uFFFD" {}
} {

  set hstr [ utf8_to_hstr $uval ]

  ifcapable bloblit {
    if {$hstr != "%00"} {
      do_test badutf2-2.1.$i {
        set sql "SELECT '$hstr'=CAST(x'$uval' AS text) AS x;"
        set res [ sqlite3_exec db $sql ]
        lindex [ lindex $res 1] 1
      } {1}
      do_test badutf2-2.2.$i {
        set sql "SELECT CAST('$hstr' AS blob)=x'$uval' AS x;"
        set res [ sqlite3_exec db $sql ]
        lindex [ lindex $res 1] 1
      } {1}
    }
    do_test badutf2-2.3.$i {
      set sql "SELECT hex(CAST(x'$uval' AS text)) AS x;"
      set res [ sqlite3_exec db $sql ]
      lindex [ lindex $res 1] 1
    } $uval
    do_test badutf2-2.4.$i {
      set sql "SELECT hex(CAST(x'$uval' AS text)) AS x;"
      set res [ sqlite3_exec db $sql ]
      lindex [ lindex $res 1] 1
    } $uval
  }

  if {$hstr != "%00"} {
    do_test badutf2-3.1.$i {
      set sql "SELECT hex('$hstr') AS x;"
      set res [ sqlite3_exec db $sql ]
      lindex [ lindex $res 1] 1
    } $uval
  }

  do_test badutf2-4.1.$i {
    sqlite3_reset $S
    sqlite3_bind_text $S 1 $xstr $len
    sqlite3_step $S
    utf8_to_ustr2 [ sqlite3_column_text $S 0 ]
  } $ustr

  do_test badutf2-5.1.$i {
    utf8_to_utf8 $uval
  } $u2u

}

do_test badutf2-4.2 {
  sqlite3_finalize $S
} {SQLITE_OK}


finish_test