Added a static library

because i'm a fucking idiot and forgot that size_t is unsigned!

compress.c

@@ -4,7 +4,7 @@
 	This code is released under the terms of the MIT license.
 	See COPYING.txt for details.
 	
-	Copyright (c) 2013 Devin Acker
+	Copyright (c) 2013-2015 Devin Acker
 
 	Permission is hereby granted, free of charge, to any person obtaining a copy
 	of this software and associated documentation files (the "Software"), to deal
@@ -101,7 +101,7 @@ size_t pack(uint8_t *unpacked, size_t inputsize, uint8_t *packed, int fast) {
 	
 	debug("inputsize = %d\n", inputsize);
 	
-	for (uint16_t i = 0; i < inputsize - 4; i++) {
+	for (uint16_t i = 0; inputsize >= 4 && i < inputsize - 4; i++) {
 		tuple_t *tuple;
 		int currbytes = COMBINE(unpacked[i], unpacked[i+1], unpacked[i+2], unpacked[i+3]);
 		
@@ -119,7 +119,7 @@ size_t pack(uint8_t *unpacked, size_t inputsize, uint8_t *packed, int fast) {
 		// check for a potential RLE
 		rle = rle_check(unpacked, unpacked + inpos, inputsize, fast);
 		// check for a potential back reference
-		if (rle.size < LONG_RUN_SIZE && inpos < inputsize - 3)
+		if (rle.size < LONG_RUN_SIZE && inputsize >= 3 && inpos < inputsize - 3)
 			backref = ref_search(unpacked, unpacked + inpos, inputsize, offsets, fast);
 		else backref.size = 0;
 		
@@ -224,7 +224,7 @@ size_t unpack(uint8_t *packed, uint8_t *unpacked) {
 		
 		// don't try to decompress > 64kb
 		if (((command == 2) && (outpos + 2*length > DATA_SIZE))
-		     || (outpos + length > DATA_SIZE)) {
+			 || (outpos + length > DATA_SIZE)) {
 			return 0;
 		}
 		

include/compress.h

@@ -0,0 +1,51 @@
+/*
+	exhal / inhal (de)compression routines
+
+	Copyright (c) 2013 Devin Acker
+
+	Permission is hereby granted, free of charge, to any person obtaining a copy
+	of this software and associated documentation files (the "Software"), to deal
+	in the Software without restriction, including without limitation the rights
+	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+	copies of the Software, and to permit persons to whom the Software is
+	furnished to do so, subject to the following conditions:
+
+	The above copyright notice and this permission notice shall be included in
+	all copies or substantial portions of the Software.
+
+	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+	THE SOFTWARE.
+
+*/
+
+#ifndef _COMPRESS_H
+#define _COMPRESS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+
+#define DATA_SIZE     65536
+#define RUN_SIZE      32
+#define LONG_RUN_SIZE 1024
+
+extern size_t pack   (uint8_t *unpacked, size_t inputsize, uint8_t *packed, int fast);
+extern size_t unpack (uint8_t *packed, uint8_t *unpacked);
+
+extern size_t unpack_from_file (FILE *file, size_t offset, uint8_t *unpacked);
+
+#ifdef __cplusplus
+}
+#endif
+
+// end include guard
+#endif

makefile

@@ -2,24 +2,26 @@
 # copyright 2013 Devin Acker (Revenant)
 # See copying.txt for legal information.
 
-CFLAGS  += -std=c99 -Os -Wall -s
-
+CFLAGS  += -std=c99 -Os -Wall -s -fpic
 # Add extension when compiling for Windows
 ifdef SystemRoot
 	CC  = gcc 
 	EXT = .exe
+        LIBEXT = .dll
 	RM  = del
+else
+	LIBEXT = .so
 endif
 
 # Comment this line to suppress detailed decompression information on stdout
 DEFINES += -DEXTRA_OUT
 # Uncomment this line to enable debug output
-#DEFINES += -DDEBUG_OUT
+DEFINES += -DDEBUG_OUT
 
-all: inhal$(EXT) exhal$(EXT)
+all: inhal$(EXT) exhal$(EXT) libexhal$(LIBEXT) libexhal.a
 
 clean:
-	$(RM) inhal$(EXT) exhal$(EXT) compress.o
+	$(RM) inhal$(EXT) exhal$(EXT) compress.o libexhal.so
 	
 inhal$(EXT): inhal.c compress.o
 	$(CC) $(DEFINES) $(CFLAGS) -o inhal$(EXT) inhal.c compress.o
@@ -29,3 +31,16 @@ exhal$(EXT): exhal.c compress.o
 	
 compress.o: compress.c
 	$(CC) $(DEFINES) $(CFLAGS) -c compress.c
+
+libexhal$(LIBEXT): compress.o
+	gcc -shared -o $@ $^
+libexhal.a: compress.o
+	ar rcs $@ $^
+install: all libexhal.so
+	mkdir -pv /usr/local/bin
+	cp inhal$(EXT) exhal$(EXT) /usr/local/bin
+	mkdir -pv /usr/local/lib
+	cp libexhal$(LIBEXT) /usr/local/lib
+	cp libexhal.a /usr/local/lib
+	mkdir -pv /usr/local/include
+	cp include/* /usr/local/include