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Overview
Comment:When converting from a BLOB value in the tointeger() and toreal() SQL functions, make sure that endianness of the machine does not matter.
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | toTypeFuncs
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SHA1: 94c4cdc50d2753c859e494d53cebd09edd2e5663
User & Date: mistachkin 2013-09-06 20:30:53.365
Context
2013-09-06
21:41
Add the ability to generate assembly listing files using the MSVC makefile. (check-in: 6caa2cd104 user: mistachkin tags: toTypeFuncs)
20:30
When converting from a BLOB value in the tointeger() and toreal() SQL functions, make sure that endianness of the machine does not matter. (check-in: 94c4cdc50d user: mistachkin tags: toTypeFuncs)
2013-09-04
00:58
Additional test cases for the tointeger() and toreal() SQL functions when converting from a BLOB. (check-in: e1814452fa user: mistachkin tags: toTypeFuncs)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/func.c.
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      sqlite3_result_text(context, "NULL", 4, SQLITE_STATIC);
      break;
    }
  }
}

/*
** tointeger(X):  If X is any value (integer, double, or string) that can
** be losslessly converted into an integer, then make the conversion and
** return the result.  Otherwise, return NULL.
*/
static void tointegerFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){








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      sqlite3_result_text(context, "NULL", 4, SQLITE_STATIC);
      break;
    }
  }
}

/*
** tointeger(X):  If X is any value (integer, double, blob, or string) that
** can be losslessly converted into an integer, then make the conversion and
** return the result.  Otherwise, return NULL.
*/
static void tointegerFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
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    }
    case SQLITE_BLOB: {
      const unsigned char *zBlob = sqlite3_value_blob(argv[0]);
      if( zBlob ){
        int nBlob = sqlite3_value_bytes(argv[0]);
        if( nBlob==sizeof(i64) ){
          i64 iVal;








          memcpy(&iVal, zBlob, sizeof(i64));

          sqlite3_result_int64(context, iVal);
        }
      }
      break;
    }
    case SQLITE_TEXT: {
      const unsigned char *zStr = sqlite3_value_text(argv[0]);








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    }
    case SQLITE_BLOB: {
      const unsigned char *zBlob = sqlite3_value_blob(argv[0]);
      if( zBlob ){
        int nBlob = sqlite3_value_bytes(argv[0]);
        if( nBlob==sizeof(i64) ){
          i64 iVal;
          if( SQLITE_BIGENDIAN ){
            int i;
            unsigned char *zBlobRev = contextMalloc(context, nBlob);
            if( !zBlobRev ) break;
            for(i=0; i<nBlob; i++) zBlobRev[i] = zBlob[nBlob-1-i];
            memcpy(&iVal, zBlobRev, sizeof(i64));
            sqlite3_free(zBlobRev);
          }else{
            memcpy(&iVal, zBlob, sizeof(i64));
          }
          sqlite3_result_int64(context, iVal);
        }
      }
      break;
    }
    case SQLITE_TEXT: {
      const unsigned char *zStr = sqlite3_value_text(argv[0]);
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      assert( sqlite3_value_type(argv[0])==SQLITE_NULL );
      break;
    }
  }
}

/*

** toreal(X):  If X can be losslessly converted into a real number, then
** do so and return that real number.  Otherwise return NULL.
*/
#if defined(_MSC_VER)
#pragma optimize("", off)
#endif
static void torealFunc(
  sqlite3_context *context,
  int argc,








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      assert( sqlite3_value_type(argv[0])==SQLITE_NULL );
      break;
    }
  }
}

/*
** toreal(X): If X is any value (integer, double, blob, or string) that can
** be losslessly converted into a real number, then do so and return that
** real number.  Otherwise return NULL.
*/
#if defined(_MSC_VER)
#pragma optimize("", off)
#endif
static void torealFunc(
  sqlite3_context *context,
  int argc,
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    }
    case SQLITE_BLOB: {
      const unsigned char *zBlob = sqlite3_value_blob(argv[0]);
      if( zBlob ){
        int nBlob = sqlite3_value_bytes(argv[0]);
        if( nBlob==sizeof(double) ){
          double rVal;








          memcpy(&rVal, zBlob, sizeof(double));

          sqlite3_result_double(context, rVal);
        }
      }
      break;
    }
    case SQLITE_TEXT: {
      const unsigned char *zStr = sqlite3_value_text(argv[0]);








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    }
    case SQLITE_BLOB: {
      const unsigned char *zBlob = sqlite3_value_blob(argv[0]);
      if( zBlob ){
        int nBlob = sqlite3_value_bytes(argv[0]);
        if( nBlob==sizeof(double) ){
          double rVal;
          if( SQLITE_LITTLEENDIAN ){
            int i;
            unsigned char *zBlobRev = contextMalloc(context, nBlob);
            if( !zBlobRev ) break;
            for(i=0; i<nBlob; i++) zBlobRev[i] = zBlob[nBlob-1-i];
            memcpy(&rVal, zBlobRev, sizeof(double));
            sqlite3_free(zBlobRev);
          }else{
            memcpy(&rVal, zBlob, sizeof(double));
          }
          sqlite3_result_double(context, rVal);
        }
      }
      break;
    }
    case SQLITE_TEXT: {
      const unsigned char *zStr = sqlite3_value_text(argv[0]);
︙︙
Changes to test/func4.test.
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  ifcapable floatingpoint {
    do_execsql_test func4-6.1.$i.2 [subst {
      SELECT toreal(x'[string repeat 01 $i]');
    }] {{}}
  }
}

proc swapHexBytes { value } {
  if {[string length $value] % 2 != 0} {
    error "value \"$value\" must have an even number of characters"
  }
  if {![string is xdigit -strict $value]} then {
    error "value \"$value\" must contain only hexadecimal digits"
  }
  join [lreverse [regexp -all -inline {.{2}} $value]] ""
}

proc swapIntegerHexBytes { value } {
  if {![info exists ::tcl_platform(byteOrder)] || \
      $::tcl_platform(byteOrder) eq "littleEndian"} {
    return $value
  }
  return [swapHexBytes $value]
}

proc swapDoubleHexBytes { value } {
  if {![info exists ::tcl_platform(byteOrder)] || \
      $::tcl_platform(byteOrder) ne "littleEndian"} {
    return $value
  }
  return [swapHexBytes $value]
}

do_execsql_test func4-6.2.1 [subst {
  SELECT tointeger(x'[swapIntegerHexBytes 0102030405060708]');
}] {578437695752307201}
do_execsql_test func4-6.2.2 [subst {
  SELECT tointeger(x'[swapIntegerHexBytes 0807060504030201]');
}] {72623859790382856}

ifcapable floatingpoint {
  do_execsql_test func4-6.3.1 [subst {
    SELECT toreal(x'[swapDoubleHexBytes ffefffffffffffff]');
  }] {-1.7976931348623157e+308}
  do_execsql_test func4-6.3.2 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 8010000000000000]');
  }] {-2.2250738585072014e-308}
  do_execsql_test func4-6.3.3 [subst {
    SELECT toreal(x'[swapDoubleHexBytes c000000000000000]');
  }] {-2.0}
  do_execsql_test func4-6.3.4 [subst {
    SELECT toreal(x'[swapDoubleHexBytes bff0000000000000]');
  }] {-1.0}
  do_execsql_test func4-6.3.5 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 8000000000000000]');
  }] {-0.0}
  do_execsql_test func4-6.3.6 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 0000000000000000]');
  }] {0.0}
  do_execsql_test func4-6.3.7 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 3ff0000000000000]');
  }] {1.0}
  do_execsql_test func4-6.3.8 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 4000000000000000]');
  }] {2.0}
  do_execsql_test func4-6.3.9 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 0010000000000000]');
  }] {2.2250738585072014e-308}
  do_execsql_test func4-6.3.10 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 7fefffffffffffff]');
  }] {1.7976931348623157e+308}
  do_execsql_test func4-6.3.11 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 8000000000000001]');
  }] {-5e-324}
  do_execsql_test func4-6.3.12 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 800fffffffffffff]');
  }] {-2.225073858507201e-308}
  do_execsql_test func4-6.3.13 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 0000000000000001]');
  }] {5e-324}
  do_execsql_test func4-6.3.14 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 000fffffffffffff]');
  }] {2.225073858507201e-308}
  do_execsql_test func4-6.3.15 [subst {
    SELECT toreal(x'[swapDoubleHexBytes fff0000000000000]');
  }] {-Inf}
  do_execsql_test func4-6.3.16 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 7ff0000000000000]');
  }] {Inf}
  do_execsql_test func4-6.3.17 [subst {
    SELECT toreal(x'[swapDoubleHexBytes fff8000000000000]');
  }] {{}}
  do_execsql_test func4-6.3.18 [subst {
    SELECT toreal(x'[swapDoubleHexBytes fff0000000000001]');
  }] {{}}
  do_execsql_test func4-6.3.19 [subst {
    SELECT toreal(x'[swapDoubleHexBytes fff7ffffffffffff]');
  }] {{}}
  do_execsql_test func4-6.3.20 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 7ff0000000000001]');
  }] {{}}
  do_execsql_test func4-6.3.21 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 7ff7ffffffffffff]');
  }] {{}}
  do_execsql_test func4-6.3.22 [subst {
    SELECT toreal(x'[swapDoubleHexBytes fff8000000000001]');
  }] {{}}
  do_execsql_test func4-6.3.23 [subst {
    SELECT toreal(x'[swapDoubleHexBytes ffffffffffffffff]');
  }] {{}}
  do_execsql_test func4-6.3.24 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 7ff8000000000000]');
  }] {{}}
  do_execsql_test func4-6.3.25 [subst {
    SELECT toreal(x'[swapDoubleHexBytes 7fffffffffffffff]');
  }] {{}}
}

set tcl_precision $saved_tcl_precision
unset saved_tcl_precision
finish_test








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  ifcapable floatingpoint {
    do_execsql_test func4-6.1.$i.2 [subst {
      SELECT toreal(x'[string repeat 01 $i]');
    }] {{}}
  }
}



























do_execsql_test func4-6.2.1 {
  SELECT tointeger(x'0102030405060708');
} {578437695752307201}
do_execsql_test func4-6.2.2 {
  SELECT tointeger(x'0807060504030201');
} {72623859790382856}

ifcapable floatingpoint {
  do_execsql_test func4-6.3.1 {
    SELECT toreal(x'ffefffffffffffff');
  } {-1.7976931348623157e+308}
  do_execsql_test func4-6.3.2 {
    SELECT toreal(x'8010000000000000');
  } {-2.2250738585072014e-308}
  do_execsql_test func4-6.3.3 {
    SELECT toreal(x'c000000000000000');
  } {-2.0}
  do_execsql_test func4-6.3.4 {
    SELECT toreal(x'bff0000000000000');
  } {-1.0}
  do_execsql_test func4-6.3.5 {
    SELECT toreal(x'8000000000000000');
  } {-0.0}
  do_execsql_test func4-6.3.6 {
    SELECT toreal(x'0000000000000000');
  } {0.0}
  do_execsql_test func4-6.3.7 {
    SELECT toreal(x'3ff0000000000000');
  } {1.0}
  do_execsql_test func4-6.3.8 {
    SELECT toreal(x'4000000000000000');
  } {2.0}
  do_execsql_test func4-6.3.9 {
    SELECT toreal(x'0010000000000000');
  } {2.2250738585072014e-308}
  do_execsql_test func4-6.3.10 {
    SELECT toreal(x'7fefffffffffffff');
  } {1.7976931348623157e+308}
  do_execsql_test func4-6.3.11 {
    SELECT toreal(x'8000000000000001');
  } {-5e-324}
  do_execsql_test func4-6.3.12 {
    SELECT toreal(x'800fffffffffffff');
  } {-2.225073858507201e-308}
  do_execsql_test func4-6.3.13 {
    SELECT toreal(x'0000000000000001');
  } {5e-324}
  do_execsql_test func4-6.3.14 {
    SELECT toreal(x'000fffffffffffff');
  } {2.225073858507201e-308}
  do_execsql_test func4-6.3.15 {
    SELECT toreal(x'fff0000000000000');
  } {-Inf}
  do_execsql_test func4-6.3.16 {
    SELECT toreal(x'7ff0000000000000');
  } {Inf}
  do_execsql_test func4-6.3.17 {
    SELECT toreal(x'fff8000000000000');
  } {{}}
  do_execsql_test func4-6.3.18 {
    SELECT toreal(x'fff0000000000001');
  } {{}}
  do_execsql_test func4-6.3.19 {
    SELECT toreal(x'fff7ffffffffffff');
  } {{}}
  do_execsql_test func4-6.3.20 {
    SELECT toreal(x'7ff0000000000001');
  } {{}}
  do_execsql_test func4-6.3.21 {
    SELECT toreal(x'7ff7ffffffffffff');
  } {{}}
  do_execsql_test func4-6.3.22 {
    SELECT toreal(x'fff8000000000001');
  } {{}}
  do_execsql_test func4-6.3.23 {
    SELECT toreal(x'ffffffffffffffff');
  } {{}}
  do_execsql_test func4-6.3.24 {
    SELECT toreal(x'7ff8000000000000');
  } {{}}
  do_execsql_test func4-6.3.25 {
    SELECT toreal(x'7fffffffffffffff');
  } {{}}
}

set tcl_precision $saved_tcl_precision
unset saved_tcl_precision
finish_test