Added a CRC32 function to libmaxsi.

libmaxsi/Makefile

@@ -30,6 +30,7 @@ ASFLAGS=$(CPUASFLAGS)
 
 OBJS=\
 ctype.o \
+crc32.o \
 file.o \
 fdio.o \
 fpipe.o \
@@ -76,6 +77,7 @@ heap.o \
 string.o \
 error.o \
 format.o \
+crc32.o \
 
 SORTIXOBJS:=$(addprefix sortix/,$(SORTIXOBJS))
 SORTIXCPPFLAGS:=-DSORTIX_KERNEL

libmaxsi/crc32.cpp

@@ -0,0 +1,72 @@
+/*******************************************************************************
+
+	COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2012.
+	COPYRIGHT(C) KRZYSZTOF DABROWSKI 1999, 2000.
+	COPYRIGHT(C) ElysiuM deeZine 1999, 2000.
+	Based on implementation by Finn Yannick Jacobs.
+
+	This file is part of LibMaxsi.
+
+	LibMaxsi is free software: you can redistribute it and/or modify it under
+	the terms of the GNU Lesser General Public License as published by the Free
+	Software Foundation, either version 3 of the License, or (at your option)
+	any later version.
+
+	LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
+	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+	details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
+
+	crc32.cpp
+	Calculates a CRC32 Checksum of binary data.
+
+*******************************************************************************/
+
+#include <libmaxsi/platform.h>
+#include <libmaxsi/crc32.h>
+
+namespace Maxsi {
+namespace CRC32 {
+
+void GenerateTable(uint32_t tabel[256])
+{
+	uint32_t poly = 0xEDB88320U;
+	for ( uint32_t i = 0; i < 256; i++ )
+	{
+		uint32_t crc = i;
+		for ( uint32_t j = 8; 0 < j; j-- )
+		{
+			if ( crc & 1 ) { crc = (crc >> 1) ^ poly; }
+			else { crc >>= 1; }
+		}
+		tabel[i] = crc;
+	}
+}
+
+uint32_t Continue(uint32_t tabel[256], uint32_t crc, uint8_t* block,
+                  size_t size)
+{
+	for ( size_t i = 0; i < size; i++ )
+	{
+		crc = ((crc >> 8) & 0x00FFFFFF) ^ tabel[(crc ^ *block++) & 0xFF];
+	}
+	return crc;
+}
+
+uint32_t Finish(uint32_t crc)
+{
+	return crc ^ 0xFFFFFFFF;
+}
+
+uint32_t Hash(uint8_t* block, size_t size)
+{
+	uint32_t tabel[256];
+	GenerateTable(tabel);
+	return Finish(Continue(tabel, START_SEED, block, size));
+}
+
+} // namespace CRC32
+} // namespace Maxsi

libmaxsi/format.cpp

@@ -239,6 +239,7 @@ namespace Maxsi
 							scanning = false;
 							break;
 						case 'x':
+						case 'X':
 							type |= HEX;
 							scanning = false;
 							break;

libmaxsi/include/libmaxsi/crc32.h

@@ -0,0 +1,43 @@
+/*******************************************************************************
+
+	COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2012.
+	COPYRIGHT(C) KRZYSZTOF DABROWSKI 1999, 2000.
+	COPYRIGHT(C) ElysiuM deeZine 1999, 2000.
+	Based on implementation by Finn Yannick Jacobs.
+
+	This file is part of LibMaxsi.
+
+	LibMaxsi is free software: you can redistribute it and/or modify it under
+	the terms of the GNU Lesser General Public License as published by the Free
+	Software Foundation, either version 3 of the License, or (at your option)
+	any later version.
+
+	LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
+	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+	details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
+
+	crc32.h
+	Calculates a CRC32 Checksum of binary data.
+
+*******************************************************************************/
+
+#ifndef LIBMAXSI_CRC32_H
+#define LIBMAXSI_CRC32_H
+
+namespace Maxsi {
+namespace CRC32 {
+
+const uint32_t START_SEED = 0xFFFFFFFF;
+void GenerateTable(uint32_t tabel[256]);
+uint32_t Continue(uint32_t tabel[256], uint32_t crc, uint8_t* buf, size_t size);
+uint32_t Finish(uint32_t crc);
+uint32_t Hash(uint8_t* block, size_t size);
+
+} // namespace CRC32
+} // namespace Maxsi
+
+#endif