Pack implementation code

Makefile

@@ -0,0 +1,28 @@
+LUA ?= lua5.1
+LUA_LIBDIR ?= $(shell pkg-config $(LUA) --libs)
+LUA_INCDIR ?= $(shell pkg-config $(LUA) --cflags)
+
+
+LIBFLAG ?= -shared
+CFLAGS ?= -std=c99 -O2 -Wall -Werror
+
+.PHONY: all clean install
+
+all: lua_pack.so
+
+lua_pack.so: lua_pack.o
+	$(CC) $(LIBFLAG) $(LUA_LIBDIR) -o $@
+	$(LUA) test.lua
+
+
+%.o: %.c
+	$(CC) -c $(CFLAGS) -fPIC $(LUA_INCDIR) $< -o $@
+
+install: lua_pack.so
+	cp lua_pack.so $(INST_LIBDIR)
+
+
+clean:
+	rm -f *.so *.o *.rock
+
+# eof

README.md

@@ -1 +1,33 @@
-# lua-pack
+This library is extended from `lpack` library on Luarocks to support Hexdecimal data too.
+
+This is a simple Lua library for packing and unpacking binary data.
+The library adds two functions to the string library: pack and unpack.
+
+pack is called as follows: pack(F,x1,x2,...), where F is a string describing
+how the values x1, x2, ... are to be interpreted and formatted. Each letter
+in the format string F consumes one of the given values. Only values of type
+number or string are accepted. pack returns a (binary) string containing the
+values packed as described in F. The letter codes understood by pack are listed
+in lpack.c (they are inspired by Perl's codes but are not the same). Numbers
+following letter codes in F indicate repetitions.
+
+unpack is called as follows: unpack(s,F,[init]), where s is a (binary) string
+containing data packed as if by pack, F is a format string describing what is
+to be read from s, and the optional init marks where in s to begin reading the
+values. unpack returns one value per letter in F until F or s is exhausted
+(the letters codes are the same as for pack, except that numbers following `A'
+are interpreted as the number of characters to read into the string, not as
+repetitions).
+
+The first value returned by unpack is the next unread position in s, which can
+be used as the init position in a subsequent call to unpack. This allows you to
+unpack values in a loop or in several steps. If the position returned by unpack
+is beyond the end of s, then s has been exhausted; any calls to unpack starting
+beyond the end of s will always return nil values.
+
+-------------------------------------------------------------------------------
+
+pack library:
+ pack(f,...) 		 unpack(s,f,[init]) 
+
+-------------------------------------------------------------------------------