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Lua Application Programming Helper Libraries
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experimental Added and moved some files around
LICENSE.txt Making all functions local consistantly Updated README
aestable.lua new file: ../ColorsHollasch.lua
alt_getopt.lua Adding getopt variants
ascii.lua Making function signatures consistant
bencode.lua fixed bencode to make local references
binarystream.lua Fixing up binarystream, memorystream, and tests
bitbang.lua Added extractbits32/64, setbits32/64 to bitbang.lua
cctype.lua Adding getopt variants
colorshollasch.lua Renaming to all lowercase file names
colorspace.lua Renaming to all lowercase file names
colorsresene.lua Renaming to all lowercase file names
crc32.lua Various renames to all lowercase filenames
enumbits.lua Added commentary within enumbits.lua file
ffi_stack.lua Changes to MemoryStream
filestream.lua Changes to make filestream conformant to current stream API
get_opts.lua Adding getopt variants
getopt_posix.lua Adding getopt variants
hashes.lua Various renames to all lowercase filenames
httpheaders.lua Added httpheaders.lua
limits.lua Added and moved some files around
ltin.lua fixed bencode to make local references
luastate.lua Various renames to all lowercase filenames
luxl.lua modified: MemoryStream.lua
maths.lua Added min_bytes_needed() to maths.lua
md5.lua Adding getopt variants
memorystream.lua Fixing up binarystream, memorystream, and tests
memutils.lua Adding getopt variants
mime.lua Making all functions local consistantly
printutils.lua moved atoi to stdc.lua
sha2.lua new file: ../ColorsHollasch.lua
stdc.lua removed stdc_included global, as it wasn't doing anything but causing…
stream.lua Changes to stream:ReadLine()
stringutils.lua Making all functions local consistantly
stringzutils.lua Making all functions local consistantly
tls.lua Various renames to all lowercase filenames
utf.lua moved atoi to stdc.lua
vector.lua Fixing up binarystream, memorystream, and tests


Lua Application Programming Helper Libraries

This is a repository of things I have found to be useful while programming in LuaJIT.

As the purpose of most of these routines are to offer some amount of function typically found in standard C libraries, there is at least usage of bit operations, memmory manipulation, and the like. For most of these cases, the LuaJIT ffi and "bit" modules are used. So, this code is not necessarily meant for usage with vanilla Lua.

In cases where 'C' functions are being supported, it's important to note the memory allocation strategy. For the most part, the 'C' semantics are utilized. That is, in the case of 'strdup', for example, memory for the new string is allocated using malloc, and not This means that whichever code was responsible for calling strdup in the first place will need to call 'free()' when they want to free up the string. Such functions are primarily meant for interop with C library routines that accept a "char *", and will then take over ownership of that memory. In most cases when the function is not going to hold onto the pointer ("const char *"), this string function should not be used.

The original sets of routines came directly out of the earliest projects where I was learning to use the LuaJIT ffi mechanism. As such, they were kind of rough, and a hodge podge of styles and usefulness. Over time, various of the routines have been surpassed by better implementations in various projects, or by functions being implemented in the LuaJIT compiler itself.

Latest: 15/06/2015 Updated to ensure nothing spills into global namespace by default Updated to use a consistant function signature style

Current: Works against LUAJIT git HEAD as of 15/06/2015


This file contains a table of the ASCII character set, with numeric values and descriptions. There are routines to create constant values from the table.


Implementation of the bencode format, which is used to encode/decode torrent files.


A 'class' that can deal with reading and writing of binary values from/to a stream. You can configure the stream to deal with a big or little endian source.


Lowest level bit twiddling. Builds upon the bitops allowing the getting/setting of bit values within a larger array of values.


Helper support for types typically found in stdint.h


Implementation of the isxxx() character classification functions typically found in the libc libraries. These routines operate on numbers, and return boolean values.


Implementation of a CRC32 routine


A simple Lua table containing HTTP headers. The table contains information as to whether the header is used for requests, responses, or both. This simple table can be used directly, or turned into another form, depending on your requirements.


Values for various limits on numeric values


Implementation of very low level XML lexer/parser. This is not a conformant validating XML parser, but it's enough to get the job done on typical .xml configuration files, and many data streams.

This implementation does no memory allocations. It returns pointers and sizes as a result of the lexing activities.


Implementation of the MD5 hash algorithm


Implementation of a streaming interface over a chunk of memory


contains several routines that have C equivalents, such as memset, memcpy, memcmp, memchr, memmove. Also contains a few convenience functions related to dealing with chunks of memory.


Contains a table and function that maps between a file extension and the appropriate mime type.


A simple Lua table which contains mime type information.


Contains a set of functions that deal with null terminated strings. All the typical security hole opening functions such as strcpy, strcmp are there, as well as their marginally more secure counterparts such as strlcpy, and strlcat.


Turns a string value into a number value. Operates on a pointer to a string value, so it does not require the source to be a Lua String.

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