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<?php $QUERYSTRING = "test.EPS"; $changes = -1; do {$changes++; $a = $QUERYSTRING; $QUERYSTRING = str_replace(array('..', '~', chr(0), ':', '?'), '', $QUERYSTRING); } while ($a != $QUERYSTRING); echo $QUERYSTRING . "\n"; echo $changes . "\n"; if( ($changes > 0) || (substr(strtolower($QUERYSTRING), -3) != ".ai") && (substr(strtolower($QUERYSTRING), -4) != ".eps")) { echo "not allowed"; } else { echo "allowed"; }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 44) Position 1 = 17, Position 2 = 2
Branch analysis from position: 17
2 jumps found. (Code = 47) Position 1 = 23, Position 2 = 42
Branch analysis from position: 23
2 jumps found. (Code = 46) Position 1 = 32, Position 2 = 41
Branch analysis from position: 32
2 jumps found. (Code = 43) Position 1 = 43, Position 2 = 45
Branch analysis from position: 43
1 jumps found. (Code = 42) Position 1 = 46
Branch analysis from position: 46
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 45
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 41
Branch analysis from position: 42
Branch analysis from position: 2
filename:       /in/HWMcL
function name:  (null)
number of ops:  47
compiled vars:  !0 = $QUERYSTRING, !1 = $changes, !2 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'test.EPS'
    5     1        ASSIGN                                                   !1, -1
    7     2    >   PRE_INC                                                  !1
          3        ASSIGN                                                   !2, !0
          4        INIT_FCALL                                               'str_replace'
          5        INIT_ARRAY                                       ~7      '..'
          6        ADD_ARRAY_ELEMENT                                ~7      '%7E'
          7        ADD_ARRAY_ELEMENT                                ~7      '%00'
          8        ADD_ARRAY_ELEMENT                                ~7      '%3A'
          9        ADD_ARRAY_ELEMENT                                ~7      '%3F'
         10        SEND_VAL                                                 ~7
         11        SEND_VAL                                                 ''
         12        SEND_VAR                                                 !0
         13        DO_ICALL                                         $8      
         14        ASSIGN                                                   !0, $8
         15        IS_NOT_EQUAL                                             !2, !0
         16      > JMPNZ                                                    ~10, ->2
    9    17    >   CONCAT                                           ~11     !0, '%0A'
         18        ECHO                                                     ~11
   11    19        CONCAT                                           ~12     !1, '%0A'
         20        ECHO                                                     ~12
   13    21        IS_SMALLER                                       ~13     0, !1
         22      > JMPNZ_EX                                         ~13     ~13, ->42
         23    >   INIT_FCALL                                               'substr'
         24        INIT_FCALL                                               'strtolower'
         25        SEND_VAR                                                 !0
         26        DO_ICALL                                         $14     
         27        SEND_VAR                                                 $14
         28        SEND_VAL                                                 -3
         29        DO_ICALL                                         $15     
         30        IS_NOT_EQUAL                                     ~16     $15, '.ai'
         31      > JMPZ_EX                                          ~16     ~16, ->41
         32    >   INIT_FCALL                                               'substr'
         33        INIT_FCALL                                               'strtolower'
         34        SEND_VAR                                                 !0
         35        DO_ICALL                                         $17     
         36        SEND_VAR                                                 $17
         37        SEND_VAL                                                 -4
         38        DO_ICALL                                         $18     
         39        IS_NOT_EQUAL                                     ~19     $18, '.eps'
         40        BOOL                                             ~16     ~19
         41    >   BOOL                                             ~13     ~16
         42    > > JMPZ                                                     ~13, ->45
   14    43    >   ECHO                                                     'not+allowed'
         44      > JMP                                                      ->46
   16    45    >   ECHO                                                     'allowed'
   17    46    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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