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fi
}
# pend_func function_name [$(printf '%q\n' arguments)]
pend_func() {
local IFS=${NO_WSP}
set -f
_pending_[${#_pending_[@]}]=$@
set +f
}
# The function which stops the release:
pend_stop_mark() {
_p_ctrl_=0
}
pend_mark() {
pend_func pend_stop_mark
}
# Execute functions until 'pend_stop_mark' . . .
pend_release() {
local -i _top_             # Declare _top_ as integer.
_p_ctrl_=${#_pending_[@]}
while [ ${_p_ctrl_} -gt 0 ]
do
_top_=${#_pending_[@]}-1
_pend_current_=${_pending_[$_top_]}
unset _pending_[$_top_]
$_pend_hook_            # Debug only.
eval $_pend_current_
done
}
# Drop functions until 'pend_stop_mark' . . .
pend_drop() {
local -i _top_
local _pd_ctrl_=${#_pending_[@]}
while [ ${_pd_ctrl_} -gt 0 ]
do
_top_=$_pd_ctrl_-1
if [ "${_pending_[$_top_]}" == 'pend_stop_mark' ]
then
unset _pending_[$_top_]
break
else
unset _pending_[$_top_]
_pd_ctrl_=$_top_
fi
done
if [ ${#_pending_[@]} -eq 0 ]
then
pend_func pend_stop_mark
fi
}
#### Array editors ####
# This function described in edit_exact.bash.
# (See "Additional documentation," above.)
# edit_exact <excludes_array_name> <target_array_name>
edit_exact() {
Advanced Bash-Scripting Guide
Appendix A. Contributed Scripts
635
How to add text fields to pdf - insert text into PDF content in C#.net, ASP.NET, MVC, Ajax, WinForms, WPF
XDoc.PDF for .NET, providing C# demo code for inserting text to PDF file
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How to add text fields to pdf - VB.NET PDF insert text library: insert text into PDF content in vb.net, ASP.NET, MVC, Ajax, WinForms, WPF
Providing Demo Code for Adding and Inserting Text to PDF File Page in VB.NET Program
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[ $# -eq 2 ] ||
[ $# -eq 3 ] || return 1
local -a _ee_Excludes
local -a _ee_Target
local _ee_x
local _ee_t
local IFS=${NO_WSP}
set -f
eval _ee_Excludes=\( \$\{$1\[@\]\} \)
eval _ee_Target=\( \$\{$2\[@\]\} \)
local _ee_len=${#_ee_Target[@]}     # Original length.
local _ee_cnt=${#_ee_Excludes[@]}   # Exclude list length.
[ ${_ee_len} -ne 0 ] || return 0    # Can't edit zero length.
[ ${_ee_cnt} -ne 0 ] || return 0    # Can't edit zero length.
for (( x = 0; x < ${_ee_cnt} ; x++ ))
do
_ee_x=${_ee_Excludes[$x]}
for (( n = 0 ; n < ${_ee_len} ; n++ ))
do
_ee_t=${_ee_Target[$n]}
if [ x"${_ee_t}" == x"${_ee_x}" ]
then
unset _ee_Target[$n]     # Discard match.
[ $# -eq 2 ] && break    # If 2 arguments, then done.
fi
done
done
eval $2=\( \$\{_ee_Target\[@\]\} \)
set +f
return 0
}
# This function described in edit_by_glob.bash.
# edit_by_glob <excludes_array_name> <target_array_name>
edit_by_glob() {
[ $# -eq 2 ] ||
[ $# -eq 3 ] || return 1
local -a _ebg_Excludes
local -a _ebg_Target
local _ebg_x
local _ebg_t
local IFS=${NO_WSP}
set -f
eval _ebg_Excludes=\( \$\{$1\[@\]\} \)
eval _ebg_Target=\( \$\{$2\[@\]\} \)
local _ebg_len=${#_ebg_Target[@]}
local _ebg_cnt=${#_ebg_Excludes[@]}
[ ${_ebg_len} -ne 0 ] || return 0
[ ${_ebg_cnt} -ne 0 ] || return 0
for (( x = 0; x < ${_ebg_cnt} ; x++ ))
do
_ebg_x=${_ebg_Excludes[$x]}
for (( n = 0 ; n < ${_ebg_len} ; n++ ))
do
[ $# -eq 3 ] && _ebg_x=${_ebg_x}'*'  #  Do prefix edit
if [ ${_ebg_Target[$n]:=} ]          #+ if defined & set.
then
_ebg_t=${_ebg_Target[$n]/#${_ebg_x}/}
[ ${#_ebg_t} -eq 0 ] && unset _ebg_Target[$n]
fi
done
done
Advanced Bash-Scripting Guide
Appendix A. Contributed Scripts
636
VB.NET PDF Form Data Read library: extract form data from PDF in
featured PDF software, it should have functions for processing text, image as Add necessary references Demo Code to Retrieve All Form Fields from a PDF File in
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eval $2=\( \$\{_ebg_Target\[@\]\} \)
set +f
return 0
}
# This function described in unique_lines.bash.
# unique_lines <in_name> <out_name>
unique_lines() {
[ $# -eq 2 ] || return 1
local -a _ul_in
local -a _ul_out
local -i _ul_cnt
local -i _ul_pos
local _ul_tmp
local IFS=${NO_WSP}
set -f
eval _ul_in=\( \$\{$1\[@\]\} \)
_ul_cnt=${#_ul_in[@]}
for (( _ul_pos = 0 ; _ul_pos < ${_ul_cnt} ; _ul_pos++ ))
do
if [ ${_ul_in[${_ul_pos}]:=} ]      # If defined & not empty
then
_ul_tmp=${_ul_in[${_ul_pos}]}
_ul_out[${#_ul_out[@]}]=${_ul_tmp}
for (( zap = _ul_pos ; zap < ${_ul_cnt} ; zap++ ))
do
[ ${_ul_in[${zap}]:=} ] &&
[ 'x'${_ul_in[${zap}]} == 'x'${_ul_tmp} ] &&
unset _ul_in[${zap}]
done
fi
done
eval $2=\( \$\{_ul_out\[@\]\} \)
set +f
return 0
}
# This function described in char_convert.bash.
# to_lower <string>
to_lower() {
[ $# -eq 1 ] || return 1
local _tl_out
_tl_out=${1//A/a}
_tl_out=${_tl_out//B/b}
_tl_out=${_tl_out//C/c}
_tl_out=${_tl_out//D/d}
_tl_out=${_tl_out//E/e}
_tl_out=${_tl_out//F/f}
_tl_out=${_tl_out//G/g}
_tl_out=${_tl_out//H/h}
_tl_out=${_tl_out//I/i}
_tl_out=${_tl_out//J/j}
_tl_out=${_tl_out//K/k}
_tl_out=${_tl_out//L/l}
_tl_out=${_tl_out//M/m}
_tl_out=${_tl_out//N/n}
_tl_out=${_tl_out//O/o}
_tl_out=${_tl_out//P/p}
_tl_out=${_tl_out//Q/q}
_tl_out=${_tl_out//R/r}
_tl_out=${_tl_out//S/s}
_tl_out=${_tl_out//T/t}
Advanced Bash-Scripting Guide
Appendix A. Contributed Scripts
637
VB.NET PDF Convert to Text SDK: Convert PDF to txt files in vb.net
Convert PDF to text in .NET WinForms and ASP.NET project. Text in any PDF fields can be copied and pasted to .txt files by keeping original layout.
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_tl_out=${_tl_out//U/u}
_tl_out=${_tl_out//V/v}
_tl_out=${_tl_out//W/w}
_tl_out=${_tl_out//X/x}
_tl_out=${_tl_out//Y/y}
_tl_out=${_tl_out//Z/z}
echo ${_tl_out}
return 0
}
#### Application helper functions ####
# Not everybody uses dots as separators (APNIC, for example).
# This function described in to_dot.bash
# to_dot <string>
to_dot() {
[ $# -eq 1 ] || return 1
echo ${1//[#|@|%]/.}
return 0
}
# This function described in is_number.bash.
# is_number <input>
is_number() {
[ "$#" -eq 1 ]    || return 1  # is blank?
[ x"$1" == 'x0' ] && return 0  # is zero?
local -i tst
let tst=$1 2>/dev/null         # else is numeric!
return $?
}
# This function described in is_address.bash.
# is_address <input>
is_address() {
[ $# -eq 1 ] || return 1    # Blank ==> false
local -a _ia_input
local IFS=${ADR_IFS}
_ia_input=( $1 )
if  [ ${#_ia_input[@]} -eq 4 ]  &&
is_number ${_ia_input[0]}   &&
is_number ${_ia_input[1]}   &&
is_number ${_ia_input[2]}   &&
is_number ${_ia_input[3]}   &&
[ ${_ia_input[0]} -lt 256 ] &&
[ ${_ia_input[1]} -lt 256 ] &&
[ ${_ia_input[2]} -lt 256 ] &&
[ ${_ia_input[3]} -lt 256 ]
then
return 0
else
return 1
fi
}
 This function described in split_ip.bash.
 split_ip <IP_address>
#+ <array_name_norm> [<array_name_rev>]
split_ip() {
[ $# -eq 3 ] ||              #  Either three
[ $# -eq 2 ] || return 1     #+ or two arguments
local -a _si_input
local IFS=${ADR_IFS}
Advanced Bash-Scripting Guide
Appendix A. Contributed Scripts
638
VB.NET PDF Text Extract Library: extract text content from PDF
With this advanced PDF Add-On, developers are able to extract target text content from source PDF document and save extracted text to other file formats
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VB.NET PDF insert image library: insert images into PDF in vb.net
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_si_input=( $1 )
IFS=${WSP_IFS}
eval $2=\(\ \$\{_si_input\[@\]\}\ \)
if [ $# -eq 3 ]
then
# Build query order array.
local -a _dns_ip
_dns_ip[0]=${_si_input[3]}
_dns_ip[1]=${_si_input[2]}
_dns_ip[2]=${_si_input[1]}
_dns_ip[3]=${_si_input[0]}
eval $3=\(\ \$\{_dns_ip\[@\]\}\ \)
fi
return 0
}
# This function described in dot_array.bash.
# dot_array <array_name>
dot_array() {
[ $# -eq 1 ] || return 1     # Single argument required.
local -a _da_input
eval _da_input=\(\ \$\{$1\[@\]\}\ \)
local IFS=${DOT_IFS}
local _da_output=${_da_input[@]}
IFS=${WSP_IFS}
echo ${_da_output}
return 0
}
# This function described in file_to_array.bash
# file_to_array <file_name> <line_array_name>
file_to_array() {
[ $# -eq 2 ] || return 1  # Two arguments required.
local IFS=${NO_WSP}
local -a _fta_tmp_
_fta_tmp_=( $(cat $1) )
eval $2=\( \$\{_fta_tmp_\[@\]\} \)
return 0
}
 Columnized print of an array of multi-field strings.
 col_print <array_name> <min_space> <
#+ tab_stop [tab_stops]>
col_print() {
[ $# -gt 2 ] || return 0
local -a _cp_inp
local -a _cp_spc
local -a _cp_line
local _cp_min
local _cp_mcnt
local _cp_pos
local _cp_cnt
local _cp_tab
local -i _cp
local -i _cpf
local _cp_fld
# WARNING: FOLLOWING LINE NOT BLANK -- IT IS QUOTED SPACES.
local _cp_max='                                                            '
set -f
local IFS=${NO_WSP}
eval _cp_inp=\(\ \$\{$1\[@\]\}\ \)
[ ${#_cp_inp[@]} -gt 0 ] || return 0 # Empty is easy.
Advanced Bash-Scripting Guide
Appendix A. Contributed Scripts
639
VB.NET PDF Password Library: add, remove, edit PDF file password
VB: Add Password to PDF with Permission Settings Applied. This VB.NET example shows how to add PDF file password with access permission setting.
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C# PDF Text Extract Library: extract text content from PDF file in
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_cp_mcnt=$2
_cp_min=${_cp_max:1:${_cp_mcnt}}
shift
shift
_cp_cnt=$#
for (( _cp = 0 ; _cp < _cp_cnt ; _cp++ ))
do
_cp_spc[${#_cp_spc[@]}]="${_cp_max:2:$1}" #"
shift
done
_cp_cnt=${#_cp_inp[@]}
for (( _cp = 0 ; _cp < _cp_cnt ; _cp++ ))
do
_cp_pos=1
IFS=${NO_WSP}$'\x20'
_cp_line=( ${_cp_inp[${_cp}]} )
IFS=${NO_WSP}
for (( _cpf = 0 ; _cpf < ${#_cp_line[@]} ; _cpf++ ))
do
_cp_tab=${_cp_spc[${_cpf}]:${_cp_pos}}
if [ ${#_cp_tab} -lt ${_cp_mcnt} ]
then
_cp_tab="${_cp_min}"
fi
echo -n "${_cp_tab}"
(( _cp_pos = ${_cp_pos} + ${#_cp_tab} ))
_cp_fld="${_cp_line[${_cpf}]}"
echo -n ${_cp_fld}
(( _cp_pos = ${_cp_pos} + ${#_cp_fld} ))
done
echo
done
set +f
return 0
}
# # # # 'Hunt the Spammer' data flow # # # #
# Application return code
declare -i _hs_RC
# Original input, from which IP addresses are removed
# After which, domain names to check
declare -a uc_name
# Original input IP addresses are moved here
# After which, IP addresses to check
declare -a uc_address
# Names against which address expansion run
# Ready for name detail lookup
declare -a chk_name
# Addresses against which name expansion run
# Ready for address detail lookup
declare -a chk_address
 Recursion is depth-first-by-name.
 The expand_input_address maintains this list
#+ to prohibit looking up addresses twice during
#+ domain name recursion.
declare -a been_there_addr
Advanced Bash-Scripting Guide
Appendix A. Contributed Scripts
640
C# PDF Password Library: add, remove, edit PDF file password in C#
C# Sample Code: Add Password to PDF with Permission Settings Applied in C#.NET. This example shows how to add PDF file password with access permission setting.
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VB.NET PDF Text Add Library: add, delete, edit PDF text in vb.net
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been_there_addr=( '127.0.0.1' ) # Whitelist localhost
# Names which we have checked (or given up on)
declare -a known_name
# Addresses which we have checked (or given up on)
declare -a known_address
 List of zero or more Blacklist servers to check.
 Each 'known_address' will be checked against each server,
#+ with negative replies and failures suppressed.
declare -a list_server
# Indirection limit - set to zero == no limit
indirect=${SPAMMER_LIMIT:=2}
# # # # 'Hunt the Spammer' information output data # # # #
# Any domain name may have multiple IP addresses.
# Any IP address may have multiple domain names.
# Therefore, track unique address-name pairs.
declare -a known_pair
declare -a reverse_pair
 In addition to the data flow variables; known_address
#+ known_name and list_server, the following are output to the
#+ external graphics interface file.
# Authority chain, parent -> SOA fields.
declare -a auth_chain
# Reference chain, parent name -> child name
declare -a ref_chain
# DNS chain - domain name -> address
declare -a name_address
# Name and service pairs - domain name -> service
declare -a name_srvc
# Name and resource pairs - domain name -> Resource Record
declare -a name_resource
# Parent and Child pairs - parent name -> child name
# This MAY NOT be the same as the ref_chain followed!
declare -a parent_child
# Address and Blacklist hit pairs - address->server
declare -a address_hits
# Dump interface file data
declare -f _dot_dump
_dot_dump=pend_dummy   # Initially a no-op
 Data dump is enabled by setting the environment variable SPAMMER_DATA
#+ to the name of a writable file.
declare _dot_file
# Helper function for the dump-to-dot-file function
# dump_to_dot <array_name> <prefix>
dump_to_dot() {
local -a _dda_tmp
Advanced Bash-Scripting Guide
Appendix A. Contributed Scripts
641
local -i _dda_cnt
local _dda_form='    '${2}'%04u %s\n'
local IFS=${NO_WSP}
eval _dda_tmp=\(\ \$\{$1\[@\]\}\ \)
_dda_cnt=${#_dda_tmp[@]}
if [ ${_dda_cnt} -gt 0 ]
then
for (( _dda = 0 ; _dda < _dda_cnt ; _dda++ ))
do
printf "${_dda_form}" \
"${_dda}" "${_dda_tmp[${_dda}]}" >>${_dot_file}
done
fi
}
# Which will also set _dot_dump to this function . . .
dump_dot() {
local -i _dd_cnt
echo '# Data vintage: '$(date -R) >${_dot_file}
echo '# ABS Guide: is_spammer.bash; v2, 2004-msz' >>${_dot_file}
echo >>${_dot_file}
echo 'digraph G {' >>${_dot_file}
if [ ${#known_name[@]} -gt 0 ]
then
echo >>${_dot_file}
echo '# Known domain name nodes' >>${_dot_file}
_dd_cnt=${#known_name[@]}
for (( _dd = 0 ; _dd < _dd_cnt ; _dd++ ))
do
printf '    N%04u [label="%s"] ;\n' \
"${_dd}" "${known_name[${_dd}]}" >>${_dot_file}
done
fi
if [ ${#known_address[@]} -gt 0 ]
then
echo >>${_dot_file}
echo '# Known address nodes' >>${_dot_file}
_dd_cnt=${#known_address[@]}
for (( _dd = 0 ; _dd < _dd_cnt ; _dd++ ))
do
printf '    A%04u [label="%s"] ;\n' \
"${_dd}" "${known_address[${_dd}]}" >>${_dot_file}
done
fi
echo                                   >>${_dot_file}
echo '/*'                              >>${_dot_file}
echo ' * Known relationships :: User conversion to'  >>${_dot_file}
echo ' * graphic form by hand or program required.'  >>${_dot_file}
echo ' *'                              >>${_dot_file}
if [ ${#auth_chain[@]} -gt 0 ]
then
echo >>${_dot_file}
echo '# Authority ref. edges followed & field source.' >>${_dot_file}
dump_to_dot auth_chain AC
fi
if [ ${#ref_chain[@]} -gt 0 ]
then
Advanced Bash-Scripting Guide
Appendix A. Contributed Scripts
642
echo >>${_dot_file}
echo '# Name ref. edges followed and field source.' >>${_dot_file}
dump_to_dot ref_chain RC
fi
if [ ${#name_address[@]} -gt 0 ]
then
echo >>${_dot_file}
echo '# Known name->address edges' >>${_dot_file}
dump_to_dot name_address NA
fi
if [ ${#name_srvc[@]} -gt 0 ]
then
echo >>${_dot_file}
echo '# Known name->service edges' >>${_dot_file}
dump_to_dot name_srvc NS
fi
if [ ${#name_resource[@]} -gt 0 ]
then
echo >>${_dot_file}
echo '# Known name->resource edges' >>${_dot_file}
dump_to_dot name_resource NR
fi
if [ ${#parent_child[@]} -gt 0 ]
then
echo >>${_dot_file}
echo '# Known parent->child edges' >>${_dot_file}
dump_to_dot parent_child PC
fi
if [ ${#list_server[@]} -gt 0 ]
then
echo >>${_dot_file}
echo '# Known Blacklist nodes' >>${_dot_file}
_dd_cnt=${#list_server[@]}
for (( _dd = 0 ; _dd < _dd_cnt ; _dd++ ))
do
printf '    LS%04u [label="%s"] ;\n' \
"${_dd}" "${list_server[${_dd}]}" >>${_dot_file}
done
fi
unique_lines address_hits address_hits
if [ ${#address_hits[@]} -gt 0 ]
then
echo >>${_dot_file}
echo '# Known address->Blacklist_hit edges' >>${_dot_file}
echo '# CAUTION: dig warnings can trigger false hits.' >>${_dot_file}
dump_to_dot address_hits AH
fi
echo          >>${_dot_file}
echo ' *'     >>${_dot_file}
echo ' * That is a lot of relationships. Happy graphing.' >>${_dot_file}
echo ' */'    >>${_dot_file}
echo '}'      >>${_dot_file}
return 0
}
# # # # 'Hunt the Spammer' execution flow # # # #
Advanced Bash-Scripting Guide
Appendix A. Contributed Scripts
643
 Execution trace is enabled by setting the
#+ environment variable SPAMMER_TRACE to the name of a writable file.
declare -a _trace_log
declare _log_file
# Function to fill the trace log
trace_logger() {
_trace_log[${#_trace_log[@]}]=${_pend_current_}
}
# Dump trace log to file function variable.
declare -f _log_dump
_log_dump=pend_dummy   # Initially a no-op.
# Dump the trace log to a file.
dump_log() {
local -i _dl_cnt
_dl_cnt=${#_trace_log[@]}
for (( _dl = 0 ; _dl < _dl_cnt ; _dl++ ))
do
echo ${_trace_log[${_dl}]} >> ${_log_file}
done
_dl_cnt=${#_pending_[@]}
if [ ${_dl_cnt} -gt 0 ]
then
_dl_cnt=${_dl_cnt}-1
echo '# # # Operations stack not empty # # #' >> ${_log_file}
for (( _dl = ${_dl_cnt} ; _dl >= 0 ; _dl-- ))
do
echo ${_pending_[${_dl}]} >> ${_log_file}
done
fi
}
# # # Utility program 'dig' wrappers # # #
#
 These wrappers are derived from the
#+ examples shown in dig_wrappers.bash.
#
 The major difference is these return
#+ their results as a list in an array.
#
 See dig_wrappers.bash for details and
#+ use that script to develop any changes.
#
# # #
# Short form answer: 'dig' parses answer.
# Forward lookup :: Name -> Address
# short_fwd <domain_name> <array_name>
short_fwd() {
local -a _sf_reply
local -i _sf_rc
local -i _sf_cnt
IFS=${NO_WSP}
echo -n '.'
# echo 'sfwd: '${1}
_sf_reply=( $(dig +short ${1} -c in -t a 2>/dev/null) )
_sf_rc=$?
if [ ${_sf_rc} -ne 0 ]
Advanced Bash-Scripting Guide
Appendix A. Contributed Scripts
644
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