Dear Robert, all,

many thanks indeed for the patches, I will incorporate them in the next
version.

Thank you very much!

I cannot test with 0.75, as the oberdiek bundle hasn't been
updated (right?), so I'll take your word for it.

I do not think so. If you want to test you can use the two attached files. oberdiek.luatex.lua comes from a new unreleased version of the oberdiek bundle, pdftexcmds.lua has just a raw fix by me. It's not official but it's just in case you want to try.

Please tell me your feeling about this. Do you think you could make an
update for TeXLive 2013 (freezing on May 20th)?

There's one nasty bug I need to fix until then, but this seems doable.

Great! I heard the date of the package freeze will be around May 20th so you still have time... The new luaotfload has a really active development, and lots of good things appear in it, I hope we'll manage to release it before the freeze...

Thank you,
--
Elie
-- 
--  This is file `oberdiek.luatex.lua',
--  generated with the docstrip utility.
-- 
--  The original source files were:
-- 
--  luatex.dtx  (with options: `lua')
--  
--  This is a generated file.
--  
--  Project: luatex
--  Version: 2010/03/09 v0.4
--  
--  Copyright (C) 2007, 2009, 2010 by
--     Heiko Oberdiek <heiko.oberdiek at googlemail.com>
--  
--  This work may be distributed and/or modified under the
--  conditions of the LaTeX Project Public License, either
--  version 1.3c of this license or (at your option) any later
--  version. This version of this license is in
--     http://www.latex-project.org/lppl/lppl-1-3c.txt
--  and the latest version of this license is in
--     http://www.latex-project.org/lppl.txt
--  and version 1.3 or later is part of all distributions of
--  LaTeX version 2005/12/01 or later.
--  
--  This work has the LPPL maintenance status "maintained".
--  
--  This Current Maintainer of this work is Heiko Oberdiek.
--  
--  The Base Interpreter refers to any `TeX-Format',
--  because some files are installed in TDS:tex/generic//.
--  
--  This work consists of the main source file luatex.dtx
--  and the derived files
--     luatex.sty, luatex.pdf, luatex.ins, luatex.drv, luatex-loader.sty,
--     luatex-test1.tex, luatex-test2.tex, luatex-test3.tex,
--     luatex-test4.tex, luatex-test5.tex, oberdiek.luatex.lua.
--  
module("oberdiek.luatex", package.seeall)
function kpse_module_loader(module)
  local script = module .. ".lua"
  local file = kpse.find_file(script, "texmfscripts")
  if file then
    local loader, error = loadfile(file)
    if loader then
      texio.write_nl("(" .. file .. ")")
      return loader
    end
    return "\n\t[oberdiek.luatex.kpse_module_loader] Loading error:\n\t"
           .. error
  end
  return "\n\t[oberdiek.luatex.kpse_module_loader] Search failed"
end
table.insert(package.searchers, kpse_module_loader)
-- 
--  End of File `oberdiek.luatex.lua'.
-- 
--  This is file `pdftexcmds.lua',
--  generated with the docstrip utility.
-- 
--  The original source files were:
-- 
--  pdftexcmds.dtx  (with options: `lua')
--  
--  This is a generated file.
--  
--  Project: pdftexcmds
--  Version: 2011/11/29 v0.20
--  
--  Copyright (C) 2007, 2009-2011 by
--     Heiko Oberdiek <heiko.oberdiek at googlemail.com>
--  
--  This work may be distributed and/or modified under the
--  conditions of the LaTeX Project Public License, either
--  version 1.3c of this license or (at your option) any later
--  version. This version of this license is in
--     http://www.latex-project.org/lppl/lppl-1-3c.txt
--  and the latest version of this license is in
--     http://www.latex-project.org/lppl.txt
--  and version 1.3 or later is part of all distributions of
--  LaTeX version 2005/12/01 or later.
--  
--  This work has the LPPL maintenance status "maintained".
--  
--  This Current Maintainer of this work is Heiko Oberdiek.
--  
--  The Base Interpreter refers to any `TeX-Format',
--  because some files are installed in TDS:tex/generic//.
--  
--  This work consists of the main source file pdftexcmds.dtx
--  and the derived files
--     pdftexcmds.sty, pdftexcmds.pdf, pdftexcmds.ins, pdftexcmds.drv,
--     pdftexcmds.bib, pdftexcmds-test1.tex, pdftexcmds-test2.tex,
--     pdftexcmds-test-shell.tex, pdftexcmds-test-escape.tex,
--     oberdiek.pdftexcmds.lua, pdftexcmds.lua.
--  
module("oberdiek.pdftexcmds", package.seeall)
local systemexitstatus
function getversion()
  tex.write("2011/11/29 v0.20")
end
function strcmp(A, B)
  if A == B then
    tex.write("0")
  elseif A < B then
    tex.write("-1")
  else
    tex.write("1")
  end
end
local function utf8_to_byte(str)
  local i = 0
  local n = string.len(str)
  local t = {}
  while i < n do
    i = i + 1
    local a = string.byte(str, i)
    if a < 128 then
      table.insert(t, string.char(a))
    else
      if a >= 192 and i < n then
        i = i + 1
        local b = string.byte(str, i)
        if b < 128 or b >= 192 then
          i = i - 1
        elseif a == 194 then
          table.insert(t, string.char(b))
        elseif a == 195 then
          table.insert(t, string.char(b + 64))
        end
      end
    end
  end
  return table.concat(t)
end
function escapehex(str, mode)
  if mode == "byte" then
    str = utf8_to_byte(str)
  end
  tex.write((string.gsub(str, ".",
    function (ch)
      return string.format("%02X", string.byte(ch))
    end
  )))
end
function unescapehex(str, mode, patch)
  local a = 0
  local first = true
  local result = {}
  for i = 1, string.len(str), 1 do
    local ch = string.byte(str, i)
    if ch >= 48 and ch <= 57 then
      ch = ch - 48
    elseif ch >= 65 and ch <= 70 then
      ch = ch - 55
    elseif ch >= 97 and ch <= 102 then
      ch = ch - 87
    else
      ch = nil
    end
    if ch then
      if first then
        a = ch * 16
        first = false
      else
        table.insert(result, a + ch)
        first = true
      end
    end
  end
  if not first then
    table.insert(result, a)
  end
  if patch == 1 then
    local temp = {}
    for i, a in ipairs(result) do
      if a == 0 then
        table.insert(temp, 1)
        table.insert(temp, 1)
      else
        if a == 1 then
          table.insert(temp, 1)
          table.insert(temp, 2)
        else
          table.insert(temp, a)
        end
      end
    end
    result = temp
  end
  if mode == "byte" then
    local utf8 = {}
    for i, a in ipairs(result) do
      if a < 128 then
        table.insert(utf8, a)
      else
        if a < 192 then
          table.insert(utf8, 194)
          a = a - 128
        else
          table.insert(utf8, 195)
          a = a - 192
        end
        table.insert(utf8, a + 128)
      end
    end
    result = utf8
  end
  local unpack = _G["unpack"] or table.unpack
  tex.settoks(toks, string.char(unpack(result)))
end
function escapestring(str, mode)
  if mode == "byte" then
    str = utf8_to_byte(str)
  end
  tex.write((string.gsub(str, ".",
    function (ch)
      local b = string.byte(ch)
      if b < 33 or b > 126 then
        return string.format("\\%.3o", b)
      end
      if b == 40 or b == 41 or b == 92 then
        return "\\" .. ch
      end
      return nil
    end
  )))
end
function escapename(str, mode)
  if mode == "byte" then
    str = utf8_to_byte(str)
  end
  tex.write((string.gsub(str, ".",
    function (ch)
      local b = string.byte(ch)
      if b == 0 then
        return ""
      end
      if b <= 32 or b >= 127
          or b == 35 or b == 37 or b == 40 or b == 41
          or b == 47 or b == 60 or b == 62 or b == 91
          or b == 93 or b == 123 or b == 125 then
        return string.format("#%.2X", b)
      else
        return nil
      end
    end
  )))
end
function filesize(filename)
  local foundfile = kpse.find_file(filename, "tex", true)
  if foundfile then
    local size = lfs.attributes(foundfile, "size")
    if size then
      tex.write(size)
    end
  end
end
function filemoddate(filename)
  local foundfile = kpse.find_file(filename, "tex", true)
  if foundfile then
    local date = lfs.attributes(foundfile, "modification")
    if date then
      local d = os.date("*t", date)
      if d.sec >= 60 then
        d.sec = 59
      end
      local u = os.date("!*t", date)
      local off = 60 * (d.hour - u.hour) + d.min - u.min
      if d.year ~= u.year then
        if d.year > u.year then
          off = off + 1440
        else
          off = off - 1440
        end
      elseif d.yday ~= u.yday then
        if d.yday > u.yday then
          off = off + 1440
        else
          off = off - 1440
        end
      end
      local timezone
      if off == 0 then
        timezone = "Z"
      else
        local hours = math.floor(off / 60)
        local mins = math.abs(off - hours * 60)
        timezone = string.format("%+03d'%02d'", hours, mins)
      end
      tex.write(string.format("D:%04d%02d%02d%02d%02d%02d%s",
          d.year, d.month, d.day, d.hour, d.min, d.sec, timezone))
    end
  end
end
function filedump(offset, length, filename)
  length = tonumber(length)
  if length and length > 0 then
    local foundfile = kpse.find_file(filename, "tex", true)
    if foundfile then
      offset = tonumber(offset)
      if not offset then
        offset = 0
      end
      local filehandle = io.open(foundfile, "r")
      if filehandle then
        if offset > 0 then
          filehandle:seek("set", offset)
        end
        local dump = filehandle:read(length)
        escapehex(dump)
      end
    end
  end
end
function mdfivesum(str, mode)
  if mode == "byte" then
    str = utf8_to_byte(str)
  end
  escapehex(md5.sum(str))
end
function filemdfivesum(filename)
  local foundfile = kpse.find_file(filename, "tex", true)
  if foundfile then
    local filehandle = io.open(foundfile, "r")
    if filehandle then
      local contents = filehandle:read("*a")
      escapehex(md5.sum(contents))
    end
  end
end
local basetime = 0
function resettimer()
  basetime = os.clock()
end
function elapsedtime()
  local val = (os.clock() - basetime) * 65536 + .5
  if val > 2147483647 then
    val = 2147483647
  end
  tex.write(string.format("%d", val))
end
function shellescape()
  if os.execute then
    if status
        and status.luatex_version
        and status.luatex_version >= 68 then
      tex.write(os.execute())
    else
      local result = os.execute()
      if result == 0 then
        tex.write("0")
      else
        if result == nil then
          tex.write("0")
        else
          tex.write("1")
        end
      end
    end
  else
    tex.write("0")
  end
end
function system(cmdline)
  systemexitstatus = nil
  texio.write_nl("log", "system(" .. cmdline .. ") ")
  if os.execute then
    texio.write("log", "executed.")
    systemexitstatus = os.execute(cmdline)
  else
    texio.write("log", "disabled.")
  end
end
function lastsystemstatus()
  local result = tonumber(systemexitstatus)
  if result then
    local x = math.floor(result / 256)
    tex.write(result - 256 * math.floor(result / 256))
  end
end
function lastsystemexit()
  local result = tonumber(systemexitstatus)
  if result then
    tex.write(math.floor(result / 256))
  end
end
function pipe(cmdline, patch)
  local result
  systemexitstatus = nil
  texio.write_nl("log", "pipe(" .. cmdline ..") ")
  if io.popen then
    texio.write("log", "executed.")
    local handle = io.popen(cmdline, "r")
    if handle then
      result = handle:read("*a")
      handle:close()
    end
  else
    texio.write("log", "disabled.")
  end
  if result then
    if patch == 1 then
      local temp = {}
      for i, a in ipairs(result) do
        if a == 0 then
          table.insert(temp, 1)
          table.insert(temp, 1)
        else
          if a == 1 then
            table.insert(temp, 1)
            table.insert(temp, 2)
          else
            table.insert(temp, a)
          end
        end
      end
      result = temp
    end
    tex.settoks(toks, result)
  else
    tex.settoks(toks, "")
  end
end
-- 
--  End of File `pdftexcmds.lua'.

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