Update bits-info.sh

tools/bits-info.sh

@@ -248,32 +248,42 @@ file_getprop()
   grep -m 1 -F -e "${1:?}=" -- "${2:?}" | cut -d '=' -f '2-' -s
 }
 
+switch_endianness()
+{
+  local _hex_bytes _switch_cur_line 2> /dev/null
+
+  _hex_bytes="$(cat | grep -o -e '..')" || return "${?}"
+
+  for _switch_cur_line in 4 3 2 1; do
+    printf '%s\n' "${_hex_bytes:?}" | head -n "${_switch_cur_line:?}" | tail -n "+${_switch_cur_line:?}" | tr -d '\n' || return "${?}"
+  done
+  printf '\n'
+}
+
+dump_hex()
+{
+  if command 1> /dev/null 2>&1 -v hexdump; then
+    hexdump -v -e '/1 "%02x"' -s "${3:?}" -n "${2:?}" -- "${1:?}"
+  else
+    xxd -p -s "${3:?}" -l "${2:?}" -- "${1:?}"
+  fi
+}
+
 check_bitness_of_pe_file()
 {
   local _pe_header_pos _pe_header 2> /dev/null
 
-echo '---'
-echo ":_${1:?}_"
-test -e "${1:?}"; echo "Exist: $?"
-command -v hexdump || true; echo "hexdump: $?"
-command -v od || true; echo "od: $?"
-command -v xxd || true; echo "xxd: $?"
-command -v tac || true; echo "tac: $?"
-command -v tr || true; echo "tr: $?"
-echo '---'
-  if test ! -e "${1:?}" || ! command -v hexdump; then
-    : #printf '%s\n' 'unknown'
-    #return 1
+  if test ! -e "${1:?}" || {
+    ! command 1> /dev/null 2>&1 -v hexdump && ! command 1> /dev/null 2>&1 -v xxd
+  }; then
+    printf '%s\n' 'unknown'
+    return 1
   fi
 
   # More info: https://learn.microsoft.com/en-us/windows/win32/debug/pe-format
 
-echo '---'
-hexdump -v -s 0x3C -n 4 -e '/1 "%02x\n"' -- "${1:?}" | tac | tr -d '\n'; printf "\n$?\n"
-  if _pe_header_pos="$(hexdump -v -s 0x3C -n 4 -e '/1 "%02x\n"' -- "${1:?}" | tac | tr -d '\n')" && test -n "${_pe_header_pos?}" && _pe_header_pos="0x${_pe_header_pos:?}"; then
-echo '---'
-hexdump -v -s "${_pe_header_pos:?}" -n 6 -e '/1 "%02x"' -- "${1:?}"; printf "\n$?\n"
-    if _pe_header="$(hexdump 2> /dev/null -v -s "${_pe_header_pos:?}" -n 6 -e '/1 "%02x"' -- "${1:?}")" && printf '%s\n' "${_pe_header?}" | grep -m 1 -q -e '^50450000'; then
+  if _pe_header_pos="$(dump_hex "${1:?}" '4' '0x3C' | switch_endianness)" && test -n "${_pe_header_pos?}" && _pe_header_pos="0x${_pe_header_pos:?}"; then
+    if _pe_header="$(dump_hex "${1:?}" '6' "${_pe_header_pos:?}")" && printf '%s\n' "${_pe_header?}" | grep -m 1 -q -e '^50450000'; then
       # PE header => PE (0x50 0x45) + 0x00 0x00 + Machine field
       case "${_pe_header?}" in
         *'6486') printf '%s\n' '64-bit PE' ;; # AMD64 (0x64 0x86)
@@ -284,7 +294,6 @@ hexdump -v -s "${_pe_header_pos:?}" -n 6 -e '/1 "%02x"' -- "${1:?}"; printf "\n$
           return 2
           ;;
       esac
-echo '---'
       return 0
     fi
   fi
@@ -316,18 +325,14 @@ main()
   _limits_date='32767 2147480047 2147483647 32535215999 32535244799 67767976233529199 67767976233532799 67768036191673199 67768036191676799 9223372036854775807'
   _limits_u='65535 2147483647 2147483648 4294967295 18446744073709551615'
 
-  shell_exe="$(readlink 2> /dev/null "/proc/${$}/exe")" || shell_exe='x'
+  shell_exe="$(readlink 2> /dev/null "/proc/${$}/exe")" || shell_exe=''
 
   shell_info="$(get_shell_info || true)"
   shell_name="$(printf '%s\n' "${shell_info:?}" | cut -d ' ' -f '1' || true)"
 
-echo "_${shell_exe?}_"
-ls -l /proc/$$/path/a.out || true
-stat /proc/$$/path/a.out || true
-readlink /proc/$$/path/a.out || true
-echo '==='
-
 test -n "${shell_exe?}" && check_bitness_of_pe_file "${shell_exe:?}"
+echo '---'
+
   if test -n "${shell_exe?}" && tmp_var="$(hexdump 2> /dev/null -v -n 5 -e '/1 "%02x"' -- "${shell_exe:?}")" && test -n "${tmp_var?}" && printf '%s\n' "${tmp_var:?}" | grep -m 1 -q -e '^7f454c46'; then
     # On Linux / Android
     # ELF header => 0x7F + ELF (0x45 0x4C 0x46) + 0x01 for 32-bit or 0x02 for 64-bit
@@ -336,8 +341,8 @@ test -n "${shell_exe?}" && check_bitness_of_pe_file "${shell_exe:?}"
       *'01') shell_bit='32-bit ELF' ;;
       *) shell_bit='unknown' ;;
     esac
-  #elif test -n "${shell_exe?}" && shell_bit="$(check_bitness_of_pe_file "${shell_exe:?}")"; then
-    #:
+  elif test -n "${shell_exe?}" && shell_bit="$(check_bitness_of_pe_file "${shell_exe:?}")"; then
+    :
   elif tmp_var="$(uname 2> /dev/null -m)"; then
     case "${tmp_var?}" in
       x86_64 | ia64 | arm64 | aarch64 | mips64) shell_bit='64-bit' ;;