[6] | 1 | module m_wxml_buffer |
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| 2 | |
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| 3 | ! |
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| 4 | ! At this point we use a fixed-size buffer. |
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| 5 | ! Note however that buffer overflows will only be |
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| 6 | ! triggered by overly long *unbroken* pcdata values, or |
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| 7 | ! by overly long attribute values. Hopefully |
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| 8 | ! element or attribute names are "short enough". |
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| 9 | ! There is code in the parser module m_fsm to avoid buffer overflows |
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| 10 | ! caused by pcdata values. |
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| 11 | ! |
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| 12 | ! This module is re-used from the parser package. |
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| 13 | ! Most of the routines are superfluous at this point. |
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| 14 | ! |
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| 15 | ! In a forthcoming implementation it could be made dynamical... |
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| 16 | ! |
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| 17 | integer, parameter, public :: MAX_BUFF_SIZE = 2000 |
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| 18 | integer, parameter, private :: BUFF_SIZE_WARNING = 1750 |
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| 19 | ! |
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| 20 | type, public :: buffer_t |
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| 21 | private |
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| 22 | integer :: size |
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| 23 | character(len=MAX_BUFF_SIZE) :: str |
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| 24 | end type buffer_t |
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| 25 | |
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| 26 | public :: add_to_buffer |
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| 27 | public :: print_buffer, str, char, len |
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| 28 | public :: operator (.equal.) |
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| 29 | public :: buffer_nearly_full, reset_buffer |
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| 30 | |
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| 31 | |
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| 32 | !---------------------------------------------------------------- |
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| 33 | interface add_to_buffer |
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| 34 | module procedure add_str_to_buffer |
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| 35 | end interface |
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| 36 | private :: add_char_to_buffer, add_str_to_buffer |
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| 37 | |
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| 38 | interface operator (.equal.) |
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| 39 | module procedure compare_buffers, compare_buffer_str, & |
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| 40 | compare_str_buffer |
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| 41 | end interface |
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| 42 | private :: compare_buffers, compare_buffer_str, compare_str_buffer |
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| 43 | |
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| 44 | interface str |
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| 45 | module procedure buffer_to_str |
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| 46 | end interface |
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| 47 | interface char ! Experimental |
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| 48 | module procedure buffer_to_str |
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| 49 | end interface |
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| 50 | private :: buffer_to_str |
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| 51 | |
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| 52 | interface len |
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| 53 | module procedure buffer_length |
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| 54 | end interface |
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| 55 | private :: buffer_length |
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| 56 | |
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| 57 | CONTAINS |
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| 58 | !================================================================== |
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| 59 | |
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| 60 | !---------------------------------------------------------------- |
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| 61 | function compare_buffers(a,b) result(equal) ! .equal. generic |
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| 62 | type(buffer_t), intent(in) :: a |
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| 63 | type(buffer_t), intent(in) :: b |
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| 64 | logical :: equal |
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| 65 | |
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| 66 | equal = ((a%size == b%size) .and. (a%str(1:a%size) == b%str(1:b%size))) |
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| 67 | |
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| 68 | end function compare_buffers |
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| 69 | |
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| 70 | !---------------------------------------------------------------- |
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| 71 | function compare_buffer_str(buffer,str) result(equal) ! .equal. generic |
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| 72 | type(buffer_t), intent(in) :: buffer |
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| 73 | character(len=*), intent(in) :: str |
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| 74 | logical :: equal |
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| 75 | |
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| 76 | equal = (buffer%str(1:buffer%size) == trim(str)) |
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| 77 | |
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| 78 | end function compare_buffer_str |
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| 79 | |
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| 80 | !---------------------------------------------------------------- |
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| 81 | function compare_str_buffer(str,buffer) result(equal) ! .equal. generic |
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| 82 | character(len=*), intent(in) :: str |
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| 83 | type(buffer_t), intent(in) :: buffer |
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| 84 | logical :: equal |
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| 85 | |
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| 86 | equal = (buffer%str(1:buffer%size) == trim(str)) |
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| 87 | |
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| 88 | end function compare_str_buffer |
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| 89 | |
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| 90 | !---------------------------------------------------------------- |
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| 91 | subroutine add_char_to_buffer(c,buffer) |
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| 92 | character(len=1), intent(in) :: c |
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| 93 | type(buffer_t), intent(inout) :: buffer |
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| 94 | |
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| 95 | integer :: n |
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| 96 | buffer%size = buffer%size + 1 |
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| 97 | n = buffer%size |
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| 98 | |
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| 99 | if (n> MAX_BUFF_SIZE) then |
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| 100 | stop "wxml Buffer overflow: long unbroken string of pcdata or attribute value..." |
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| 101 | ! RETURN |
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| 102 | ! |
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| 103 | endif |
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| 104 | |
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| 105 | buffer%str(n:n) = c |
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| 106 | end subroutine add_char_to_buffer |
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| 107 | |
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| 108 | !---------------------------------------------------------------- |
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| 109 | subroutine add_str_to_buffer(s,buffer) |
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| 110 | character(len=*), intent(in) :: s |
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| 111 | type(buffer_t), intent(inout) :: buffer |
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| 112 | |
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| 113 | integer :: n, len_s, last_pos |
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| 114 | |
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| 115 | len_s = len(s) |
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| 116 | last_pos = buffer%size |
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| 117 | buffer%size = buffer%size + len_s |
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| 118 | n = buffer%size |
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| 119 | |
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| 120 | if (n> MAX_BUFF_SIZE) then |
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| 121 | stop "wxml Buffer overflow: long unbroken string of pcdata or attribute value..." |
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| 122 | ! RETURN |
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| 123 | endif |
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| 124 | |
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| 125 | buffer%str(last_pos+1:n) = s |
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| 126 | end subroutine add_str_to_buffer |
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| 127 | |
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| 128 | !---------------------------------------------------------------- |
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| 129 | subroutine reset_buffer(buffer) |
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| 130 | type(buffer_t), intent(inout) :: buffer |
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| 131 | |
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| 132 | buffer%size = 0 |
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| 133 | |
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| 134 | end subroutine reset_buffer |
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| 135 | |
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| 136 | !---------------------------------------------------------------- |
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| 137 | subroutine print_buffer(buffer) |
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| 138 | type(buffer_t), intent(in) :: buffer |
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| 139 | |
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| 140 | integer :: i |
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| 141 | |
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| 142 | do i = 1, buffer%size |
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| 143 | write(unit=6,fmt="(a1)",advance="no") buffer%str(i:i) |
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| 144 | enddo |
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| 145 | |
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| 146 | end subroutine print_buffer |
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| 147 | !---------------------------------------------------------------- |
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| 148 | ! This is better... but could it lead to memory leaks? |
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| 149 | ! |
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| 150 | function buffer_to_str(buffer) result(str) |
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| 151 | type(buffer_t), intent(in) :: buffer |
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| 152 | character(len=buffer%size) :: str |
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| 153 | |
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| 154 | str = buffer%str(1:buffer%size) |
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| 155 | end function buffer_to_str |
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| 156 | |
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| 157 | !---------------------------------------------------------------- |
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| 158 | function buffer_nearly_full(buffer) result(warn) |
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| 159 | type(buffer_t), intent(in) :: buffer |
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| 160 | logical :: warn |
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| 161 | |
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| 162 | warn = buffer%size > BUFF_SIZE_WARNING |
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| 163 | |
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| 164 | end function buffer_nearly_full |
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| 165 | |
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| 166 | !---------------------------------------------------------------- |
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| 167 | function buffer_length(buffer) result(length) |
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| 168 | type(buffer_t), intent(in) :: buffer |
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| 169 | integer :: length |
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| 170 | |
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| 171 | length = buffer%size |
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| 172 | |
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| 173 | end function buffer_length |
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| 174 | |
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| 175 | |
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| 176 | end module m_wxml_buffer |
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