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libext2fs: Add crc32c implementation for metadata checksumming
authorDarrick J. Wong <djwong@us.ibm.com>
Fri, 16 Sep 2011 03:46:37 +0000 (23:46 -0400)
committerTheodore Ts'o <tytso@mit.edu>
Fri, 16 Sep 2011 03:46:51 +0000 (23:46 -0400)
Add a slicing-by-8 CRC32c implementation for metadata checksumming.
Adapted from Bob Pearson's kernel patch.

Also added a self-test mechanism so we can verify that the crc32c
implementation is working correctly.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
lib/ext2fs/Makefile.in
lib/ext2fs/crc32c.c [new file with mode: 0644]
lib/ext2fs/crc32c_defs.h [new file with mode: 0644]
lib/ext2fs/ext2fs.h
lib/ext2fs/gen_crc32ctable.c [new file with mode: 0644]

index e374c1c..60f4e96 100644 (file)
@@ -7,6 +7,8 @@ INSTALL = @INSTALL@
 
 @MCONFIG@
 
+XTRA_CFLAGS=   -I.
+
 @DEBUGFS_CMT@DEBUGFS_LIB_OBJS = bb_compat.o inode_io.o write_bb_file.o
 
 MK_CMDS=       _SS_DIR_OVERRIDE=../ss ../ss/mk_cmds
@@ -33,6 +35,7 @@ OBJS= $(DEBUGFS_LIB_OBJS) $(RESIZE_LIB_OBJS) $(E2IMAGE_LIB_OBJS) \
        check_desc.o \
        closefs.o \
        crc16.o \
+       crc32c.o \
        csum.o \
        dblist.o \
        dblist_dir.o \
@@ -99,6 +102,8 @@ SRCS= ext2_err.c \
        $(srcdir)/check_desc.c \
        $(srcdir)/closefs.c \
        $(srcdir)/crc16.c \
+       $(srcdir)/crc32c.c \
+       $(srcdir)/gen_crc32ctable.c \
        $(srcdir)/csum.c \
        $(srcdir)/dblist.c \
        $(srcdir)/dblist_dir.c \
@@ -341,11 +346,15 @@ tst_csum: csum.c $(STATIC_LIBEXT2FS) $(DEPLIBCOM_ERR) \
        $(Q) $(CC) -o tst_csum $(srcdir)/csum.c -DDEBUG \
                $(ALL_CFLAGS) $(STATIC_LIBEXT2FS) $(LIBCOM_ERR) $(LIBE2P)
 
+tst_crc32c: $(srcdir)/crc32c.c
+       $(Q) $(CC) $(BUILD_LDFLAGS) $(ALL_CFLAGS) -o tst_crc32c $(srcdir)/crc32c.c \
+               -DUNITTEST
+
 mkjournal: mkjournal.c $(STATIC_LIBEXT2FS) $(DEPLIBCOM_ERR)
        $(E) "  LD $@"
        $(Q) $(CC) -o mkjournal $(srcdir)/mkjournal.c -DDEBUG $(STATIC_LIBEXT2FS) $(LIBCOM_ERR) $(ALL_CFLAGS)
 
-check:: tst_bitops tst_badblocks tst_iscan tst_types tst_icount tst_super_size tst_types tst_inode_size tst_csum
+check:: tst_bitops tst_badblocks tst_iscan tst_types tst_icount tst_super_size tst_types tst_inode_size tst_csum tst_crc32c
        LD_LIBRARY_PATH=$(LIB) DYLD_LIBRARY_PATH=$(LIB) ./tst_bitops
        LD_LIBRARY_PATH=$(LIB) DYLD_LIBRARY_PATH=$(LIB) ./tst_badblocks
        LD_LIBRARY_PATH=$(LIB) DYLD_LIBRARY_PATH=$(LIB) ./tst_iscan
@@ -353,6 +362,7 @@ check:: tst_bitops tst_badblocks tst_iscan tst_types tst_icount tst_super_size t
        LD_LIBRARY_PATH=$(LIB) DYLD_LIBRARY_PATH=$(LIB) ./tst_icount
        LD_LIBRARY_PATH=$(LIB) DYLD_LIBRARY_PATH=$(LIB) ./tst_super_size
        LD_LIBRARY_PATH=$(LIB) DYLD_LIBRARY_PATH=$(LIB) ./tst_csum
+       LD_LIBRARY_PATH=$(LIB) DYLD_LIBRARY_PATH=$(LIB) ./tst_crc32c
 
 installdirs::
        $(E) "  MKINSTALLDIRS $(libdir) $(includedir)/ext2fs"
@@ -386,7 +396,8 @@ clean::
                tst_byteswap tst_ismounted tst_getsize tst_sectgetsize \
                tst_bitops tst_types tst_icount tst_super_size tst_csum \
                ext2_tdbtool mkjournal debug_cmds.c \
-               ../libext2fs.a ../libext2fs_p.a ../libext2fs_chk.a
+               ../libext2fs.a ../libext2fs_p.a ../libext2fs_chk.a \
+               crc32c_table.h
 
 mostlyclean:: clean
 distclean:: clean
@@ -399,6 +410,15 @@ $(top_builddir)/lib/ext2fs/ext2_err.h: ext2_err.h
 
 $(OBJS): subdirs
 
+gen_crc32ctable: $(srcdir)/gen_crc32ctable.c
+       $(E) "  CC $@"
+       $(Q) $(BUILD_CC) $(BUILD_CFLAGS) -o gen_crc32ctable \
+               $(srcdir)/gen_crc32ctable.c
+
+crc32c_table.h: gen_crc32ctable
+       $(E) "  GEN32CTABLE $@"
+       $(Q) ./gen_crc32ctable > crc32c_table.h
+
 # +++ Dependency line eater +++
 # 
 # Makefile dependencies follow.  This must be the last section in
@@ -482,6 +502,8 @@ closefs.o: $(srcdir)/closefs.c $(srcdir)/ext2_fs.h \
  $(srcdir)/bitops.h
 crc16.o: $(srcdir)/crc16.c $(top_builddir)/lib/ext2fs/ext2_types.h \
  $(srcdir)/crc16.h
+crc32c.o: $(srcdir)/crc32c.c $(srcdir)/crc32c_defs.h crc32c_table.h
+gen_crc32ctable.o: $(srcdir)/gen_crc32ctable.c $(srcdir)/crc32c_defs.h
 csum.o: $(srcdir)/csum.c $(srcdir)/ext2_fs.h \
  $(top_builddir)/lib/ext2fs/ext2_types.h $(srcdir)/ext2fs.h \
  $(srcdir)/ext2_fs.h $(srcdir)/ext3_extents.h $(top_srcdir)/lib/et/com_err.h \
diff --git a/lib/ext2fs/crc32c.c b/lib/ext2fs/crc32c.c
new file mode 100644 (file)
index 0000000..0ad19b6
--- /dev/null
@@ -0,0 +1,1127 @@
+/*
+ * crc32c.c
+ *
+ * August 26, 2011 Darrick J. Wong <djwong at us.ibm.com>
+ * Reuse Bob Pearson's slice-by-8 implementation for e2fsprogs.
+ *
+ * July 20, 2011 Bob Pearson <rpearson at systemfabricworks.com>
+ * added slice by 8 algorithm to the existing conventional and
+ * slice by 4 algorithms.
+ *
+ * Oct 15, 2000 Matt Domsch <Matt_Domsch@dell.com>
+ * Nicer crc32 functions/docs submitted by linux@horizon.com.  Thanks!
+ * Code was from the public domain, copyright abandoned.  Code was
+ * subsequently included in the kernel, thus was re-licensed under the
+ * GNU GPL v2.
+ *
+ * Oct 12, 2000 Matt Domsch <Matt_Domsch@dell.com>
+ * Same crc32 function was used in 5 other places in the kernel.
+ * I made one version, and deleted the others.
+ * There are various incantations of crc32().  Some use a seed of 0 or ~0.
+ * Some xor at the end with ~0.  The generic crc32() function takes
+ * seed as an argument, and doesn't xor at the end.  Then individual
+ * users can do whatever they need.
+ *   drivers/net/smc9194.c uses seed ~0, doesn't xor with ~0.
+ *   fs/jffs2 uses seed 0, doesn't xor with ~0.
+ *   fs/partitions/efi.c uses seed ~0, xor's with ~0.
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2.  See the file COPYING for more details.
+ */
+#include <stdint.h>
+#include <endian.h>
+#include <stdlib.h>
+#include <stdio.h>
+#define __force
+#define min(x, y)              ((x) > (y) ? (y) : (x))
+#define __ALIGN_KERNEL_MASK(x, mask)   (((x) + (mask)) & ~(mask))
+#define __ALIGN_KERNEL(x, a)   __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
+#define ALIGN(x, a)            __ALIGN_KERNEL((x), (a))
+#define PTR_ALIGN(p, a)                ((typeof(p))ALIGN((unsigned long)(p), (a)))
+#include "crc32c_defs.h"
+
+#if CRC_LE_BITS > 8
+# define tole(x) (__force uint32_t) __constant_cpu_to_le32(x)
+#else
+# define tole(x) (x)
+#endif
+
+#if CRC_BE_BITS > 8
+# define tobe(x) (__force uint32_t) __constant_cpu_to_be32(x)
+#else
+# define tobe(x) (x)
+#endif
+
+#include "crc32c_table.h"
+
+#if CRC_LE_BITS == 32
+/* slice by 4 algorithm */
+static uint32_t crc32c_le_body(uint32_t crc, uint8_t const *buf, size_t len)
+{
+       const uint8_t *p8;
+       const uint32_t *p32;
+       size_t init_bytes;
+       size_t words;
+       size_t end_bytes;
+       size_t i;
+       uint32_t q;
+       uint8_t i0, i1, i2, i3;
+
+       crc = (__force uint32_t) __cpu_to_le32(crc);
+
+       /* unroll loop into 'init_bytes' odd bytes followed by
+        * 'words' aligned 4 byte words followed by
+        * 'end_bytes' odd bytes at the end */
+       p8 = buf;
+       p32 = (uint32_t *)PTR_ALIGN(p8, 4);
+       init_bytes = min((uintptr_t)p32 - (uintptr_t)p8, len);
+       words = (len - init_bytes) >> 2;
+       end_bytes = (len - init_bytes) & 3;
+
+       for (i = 0; i < init_bytes; i++) {
+#ifndef WORDS_BIGENDIAN
+               i0 = *p8++ ^ crc;
+               crc = t0_le[i0] ^ (crc >> 8);
+#else
+               i0 = *p8++ ^ (crc >> 24);
+               crc = t0_le[i0] ^ (crc << 8);
+#endif
+       }
+
+       /* using pre-increment below slightly faster */
+       p32--;
+
+       for (i = 0; i < words; i++) {
+#ifndef WORDS_BIGENDIAN
+               q = *++p32 ^ crc;
+               i3 = q;
+               i2 = q >> 8;
+               i1 = q >> 16;
+               i0 = q >> 24;
+               crc = t3_le[i3] ^ t2_le[i2] ^ t1_le[i1] ^ t0_le[i0];
+#else
+               q = *++p32 ^ crc;
+               i3 = q >> 24;
+               i2 = q >> 16;
+               i1 = q >> 8;
+               i0 = q;
+               crc = t3_le[i3] ^ t2_le[i2] ^ t1_le[i1] ^ t0_le[i0];
+#endif
+       }
+
+       p8 = (uint8_t *)(++p32);
+
+       for (i = 0; i < end_bytes; i++) {
+#ifndef WORDS_BIGENDIAN
+               i0 = *p8++ ^ crc;
+               crc = t0_le[i0] ^ (crc >> 8);
+#else
+               i0 = *p8++ ^ (crc >> 24);
+               crc = t0_le[i0] ^ (crc << 8);
+#endif
+       }
+
+       return __le32_to_cpu((__force __le32)crc);
+}
+#endif
+
+#if CRC_BE_BITS == 32
+static uint32_t crc32c_be_body(uint32_t crc, uint8_t const *buf, size_t len)
+{
+       const uint8_t *p8;
+       const uint32_t *p32;
+       size_t init_bytes;
+       size_t words;
+       size_t end_bytes;
+       size_t i;
+       uint32_t q;
+       uint8_t i0, i1, i2, i3;
+
+       crc = (__force uint32_t) __cpu_to_be32(crc);
+
+       p8 = buf;
+       p32 = (uint32_t *)PTR_ALIGN(p8, 4);
+       init_bytes = min((uintptr_t)p32 - (uintptr_t)p8, len);
+       words = (len - init_bytes) >> 2;
+       end_bytes = (len - init_bytes) & 3;
+
+       for (i = 0; i < init_bytes; i++) {
+#ifndef WORDS_BIGENDIAN
+               i0 = *p8++ ^ crc;
+               crc = t0_be[i0] ^ (crc >> 8);
+#else
+               i0 = *p8++ ^ (crc >> 24);
+               crc = t0_be[i0] ^ (crc << 8);
+#endif
+       }
+
+       p32--;
+
+       for (i = 0; i < words; i++) {
+#ifndef WORDS_BIGENDIAN
+               q = *++p32 ^ crc;
+               i3 = q;
+               i2 = q >> 8;
+               i1 = q >> 16;
+               i0 = q >> 24;
+               crc = t3_be[i3] ^ t2_be[i2] ^ t1_be[i1] ^ t0_be[i0];
+#else
+               q = *++p32 ^ crc;
+               i3 = q >> 24;
+               i2 = q >> 16;
+               i1 = q >> 8;
+               i0 = q;
+               crc = t3_be[i3] ^ t2_be[i2] ^ t1_be[i1] ^ t0_be[i0];
+#endif
+       }
+
+       p8 = (uint8_t *)(++p32);
+
+       for (i = 0; i < end_bytes; i++) {
+#ifndef WORDS_BIGENDIAN
+               i0 = *p8++ ^ crc;
+               crc = t0_be[i0] ^ (crc >> 8);
+#else
+               i0 = *p8++ ^ (crc >> 24);
+               crc = t0_be[i0] ^ (crc << 8);
+#endif
+       }
+
+       return __be32_to_cpu((__force __be32)crc);
+}
+#endif
+
+#if CRC_LE_BITS == 64
+/* slice by 8 algorithm */
+static uint32_t crc32c_le_body(uint32_t crc, uint8_t const *buf, size_t len)
+{
+       const uint8_t *p8;
+       const uint32_t *p32;
+       size_t init_bytes;
+       size_t words;
+       size_t end_bytes;
+       size_t i;
+       uint32_t q;
+       uint8_t i0, i1, i2, i3;
+
+       crc = (__force uint32_t) __cpu_to_le32(crc);
+
+       p8 = buf;
+       p32 = (uint32_t *)PTR_ALIGN(p8, 8);
+       init_bytes = min((uintptr_t)p32 - (uintptr_t)p8, len);
+       words = (len - init_bytes) >> 3;
+       end_bytes = (len - init_bytes) & 7;
+
+       for (i = 0; i < init_bytes; i++) {
+#ifndef WORDS_BIGENDIAN
+               i0 = *p8++ ^ crc;
+               crc = t0_le[i0] ^ (crc >> 8);
+#else
+               i0 = *p8++ ^ (crc >> 24);
+               crc = t0_le[i0] ^ (crc << 8);
+#endif
+       }
+
+       p32--;
+
+       for (i = 0; i < words; i++) {
+#ifndef WORDS_BIGENDIAN
+               q = *++p32 ^ crc;
+               i3 = q;
+               i2 = q >> 8;
+               i1 = q >> 16;
+               i0 = q >> 24;
+               crc = t7_le[i3] ^ t6_le[i2] ^ t5_le[i1] ^ t4_le[i0];
+
+               q = *++p32;
+               i3 = q;
+               i2 = q >> 8;
+               i1 = q >> 16;
+               i0 = q >> 24;
+               crc ^= t3_le[i3] ^ t2_le[i2] ^ t1_le[i1] ^ t0_le[i0];
+#else
+               q = *++p32 ^ crc;
+               i3 = q >> 24;
+               i2 = q >> 16;
+               i1 = q >> 8;
+               i0 = q;
+               crc = t7_le[i3] ^ t6_le[i2] ^ t5_le[i1] ^ t4_le[i0];
+
+               q = *++p32;
+               i3 = q >> 24;
+               i2 = q >> 16;
+               i1 = q >> 8;
+               i0 = q;
+               crc ^= t3_le[i3] ^ t2_le[i2] ^ t1_le[i1] ^ t0_le[i0];
+#endif
+       }
+
+       p8 = (uint8_t *)(++p32);
+
+       for (i = 0; i < end_bytes; i++) {
+#ifndef WORDS_BIGENDIAN
+               i0 = *p8++ ^ crc;
+               crc = t0_le[i0] ^ (crc >> 8);
+#else
+               i0 = *p8++ ^ (crc >> 24);
+               crc = t0_le[i0] ^ (crc << 8);
+#endif
+       }
+
+       return __le32_to_cpu(crc);
+}
+#endif
+
+#if CRC_BE_BITS == 64
+static uint32_t crc32c_be_body(uint32_t crc, uint8_t const *buf, size_t len)
+{
+       const uint8_t *p8;
+       const uint32_t *p32;
+       size_t init_bytes;
+       size_t words;
+       size_t end_bytes;
+       size_t i;
+       uint32_t q;
+       uint8_t i0, i1, i2, i3;
+
+       crc = (__force uint32_t) __cpu_to_be32(crc);
+
+       p8 = buf;
+       p32 = (uint32_t *)PTR_ALIGN(p8, 8);
+       init_bytes = min((uintptr_t)p32 - (uintptr_t)p8, len);
+       words = (len - init_bytes) >> 3;
+       end_bytes = (len - init_bytes) & 7;
+
+       for (i = 0; i < init_bytes; i++) {
+#ifndef WORDS_BIGENDIAN
+               i0 = *p8++ ^ crc;
+               crc = t0_be[i0] ^ (crc >> 8);
+#else
+               i0 = *p8++ ^ (crc >> 24);
+               crc = t0_be[i0] ^ (crc << 8);
+#endif
+       }
+
+       p32--;
+
+       for (i = 0; i < words; i++) {
+#ifndef WORDS_BIGENDIAN
+               q = *++p32 ^ crc;
+               i3 = q;
+               i2 = q >> 8;
+               i1 = q >> 16;
+               i0 = q >> 24;
+               crc = t7_be[i3] ^ t6_be[i2] ^ t5_be[i1] ^ t4_be[i0];
+
+               q = *++p32;
+               i3 = q;
+               i2 = q >> 8;
+               i1 = q >> 16;
+               i0 = q >> 24;
+               crc ^= t3_be[i3] ^ t2_be[i2] ^ t1_be[i1] ^ t0_be[i0];
+#else
+               q = *++p32 ^ crc;
+               i3 = q >> 24;
+               i2 = q >> 16;
+               i1 = q >> 8;
+               i0 = q;
+               crc = t7_be[i3] ^ t6_be[i2] ^ t5_be[i1] ^ t4_be[i0];
+
+               q = *++p32;
+               i3 = q >> 24;
+               i2 = q >> 16;
+               i1 = q >> 8;
+               i0 = q;
+               crc ^= t3_be[i3] ^ t2_be[i2] ^ t1_be[i1] ^ t0_be[i0];
+#endif
+       }
+
+       p8 = (uint8_t *)(++p32);
+
+       for (i = 0; i < end_bytes; i++) {
+#ifndef WORDS_BIGENDIAN
+               i0 = *p8++ ^ crc;
+               crc = t0_be[i0] ^ (crc >> 8);
+#else
+               i0 = *p8++ ^ (crc >> 24);
+               crc = t0_be[i0] ^ (crc << 8);
+#endif
+       }
+
+       return __be32_to_cpu(crc);
+}
+#endif
+
+/**
+ * crc32c_le() - Calculate bitwise little-endian CRC32c.
+ * @crc: seed value for computation.  ~0 for ext4, sometimes 0 for
+ *     other uses, or the previous crc32c value if computing incrementally.
+ * @p: pointer to buffer over which CRC is run
+ * @len: length of buffer @p
+ */
+uint32_t ext2fs_crc32c_le(uint32_t crc, unsigned char const *p, size_t len)
+{
+#if CRC_LE_BITS == 1
+       int i;
+       while (len--) {
+               crc ^= *p++;
+               for (i = 0; i < 8; i++)
+                       crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
+       }
+# elif CRC_LE_BITS == 2
+       while (len--) {
+               crc ^= *p++;
+               crc = (crc >> 2) ^ t0_le[crc & 0x03];
+               crc = (crc >> 2) ^ t0_le[crc & 0x03];
+               crc = (crc >> 2) ^ t0_le[crc & 0x03];
+               crc = (crc >> 2) ^ t0_le[crc & 0x03];
+       }
+# elif CRC_LE_BITS == 4
+       while (len--) {
+               crc ^= *p++;
+               crc = (crc >> 4) ^ t0_le[crc & 0x0f];
+               crc = (crc >> 4) ^ t0_le[crc & 0x0f];
+       }
+# elif CRC_LE_BITS == 8
+       while (len--) {
+               crc ^= *p++;
+               crc = (crc >> 8) ^ t0_le[crc & 0xff];
+       }
+# else
+       crc = crc32c_le_body(crc, p, len);
+# endif
+       return crc;
+}
+
+/**
+ * crc32c_be() - Calculate bitwise big-endian CRC32c.
+ * @crc: seed value for computation.  ~0 for ext4, sometimes 0 for
+ *     other uses, or the previous crc32c value if computing incrementally.
+ * @p: pointer to buffer over which CRC is run
+ * @len: length of buffer @p
+ */
+uint32_t ext2fs_crc32c_be(uint32_t crc, unsigned char const *p, size_t len)
+{
+#if CRC_BE_BITS == 1
+       int i;
+       while (len--) {
+               crc ^= *p++ << 24;
+               for (i = 0; i < 8; i++)
+                       crc = (crc << 1) ^
+                             ((crc & 0x80000000) ? CRCPOLY_BE : 0);
+       }
+# elif CRC_BE_BITS == 2
+       while (len--) {
+               crc ^= *p++ << 24;
+               crc = (crc << 2) ^ t0_be[crc >> 30];
+               crc = (crc << 2) ^ t0_be[crc >> 30];
+               crc = (crc << 2) ^ t0_be[crc >> 30];
+               crc = (crc << 2) ^ t0_be[crc >> 30];
+       }
+# elif CRC_BE_BITS == 4
+       while (len--) {
+               crc ^= *p++ << 24;
+               crc = (crc << 4) ^ t0_be[crc >> 28];
+               crc = (crc << 4) ^ t0_be[crc >> 28];
+       }
+# elif CRC_BE_BITS == 8
+       while (len--) {
+               crc ^= *p++ << 24;
+               crc = (crc << 8) ^ t0_be[crc >> 24];
+       }
+# else
+       crc = crc32c_be_body(crc, p, len);
+# endif
+       return crc;
+}
+
+#ifdef UNITTEST
+static uint8_t test_buf[] = {
+       0xd9, 0xd7, 0x6a, 0x13, 0x3a, 0xb1, 0x05, 0x48,
+       0xda, 0xad, 0x14, 0xbd, 0x03, 0x3a, 0x58, 0x5e,
+       0x6e, 0xd1, 0x56, 0xc9, 0x2e, 0xc4, 0xcb, 0x6b,
+       0xe8, 0x77, 0x52, 0x37, 0x4e, 0x0f, 0x55, 0xd2,
+       0x12, 0x65, 0x90, 0xc2, 0x41, 0x49, 0x81, 0x01,
+       0xf5, 0x01, 0xeb, 0x2d, 0x78, 0x74, 0x23, 0x5d,
+       0x84, 0x5c, 0x81, 0x92, 0x21, 0xe9, 0x8d, 0x1d,
+       0x89, 0xf2, 0x4a, 0xac, 0xdd, 0xf9, 0xaf, 0xee,
+       0x44, 0xe7, 0x6e, 0xed, 0xfb, 0xd8, 0x89, 0x0e,
+       0x96, 0x62, 0xcd, 0xa4, 0x4b, 0xa9, 0xe5, 0x45,
+       0xb1, 0x29, 0x9b, 0x0f, 0xfc, 0xbd, 0x83, 0xab,
+       0xa8, 0x54, 0x96, 0x44, 0x2c, 0x7f, 0xbb, 0xe7,
+       0x52, 0x29, 0x08, 0xee, 0x14, 0xc5, 0xc2, 0xec,
+       0x5a, 0xeb, 0x40, 0x40, 0xea, 0xd1, 0x3d, 0x15,
+       0x73, 0xaa, 0x8c, 0x73, 0xfc, 0xf2, 0x2b, 0x49,
+       0x0b, 0x13, 0x96, 0xd9, 0x8e, 0x4b, 0xbc, 0xe0,
+       0xf4, 0xd2, 0xe0, 0x2e, 0x7a, 0xf0, 0x5d, 0x1f,
+       0xd2, 0x92, 0x97, 0xe0, 0xaa, 0x59, 0xab, 0xc9,
+       0x5c, 0xa6, 0x51, 0x1a, 0xe3, 0xd6, 0x06, 0xb9,
+       0xae, 0xb8, 0x76, 0x36, 0x79, 0x37, 0x52, 0xf6,
+       0x34, 0xaf, 0x27, 0x19, 0xe1, 0xc0, 0x2b, 0xdd,
+       0x01, 0x15, 0xcd, 0xce, 0x44, 0xf6, 0x4c, 0x18,
+       0x92, 0x69, 0xbe, 0x8a, 0x76, 0x23, 0x52, 0x13,
+       0x3f, 0xf9, 0xe0, 0xf5, 0x06, 0x28, 0x7c, 0xc7,
+       0xf3, 0x42, 0x0f, 0xdd, 0x40, 0x33, 0xf7, 0x99,
+       0xe2, 0xad, 0x26, 0xd9, 0x53, 0x10, 0x72, 0x0c,
+       0x4e, 0x43, 0x4c, 0x61, 0xfe, 0xd9, 0xc1, 0x16,
+       0xa1, 0x93, 0xca, 0x3c, 0x75, 0x7f, 0x07, 0x7a,
+       0x65, 0xb3, 0x53, 0x2a, 0x52, 0x00, 0xa0, 0x62,
+       0xe0, 0xa3, 0x1f, 0xad, 0xd7, 0xbb, 0xc0, 0x83,
+       0x5d, 0x54, 0x87, 0x5f, 0xc8, 0x2f, 0xc8, 0xbf,
+       0x69, 0x04, 0x91, 0xc8, 0xa6, 0x1d, 0x4d, 0x46,
+       0x91, 0xfc, 0x26, 0xf4, 0x16, 0xd1, 0xa4, 0xbf,
+       0x5c, 0xa2, 0x6c, 0xdd, 0xb4, 0x40, 0xf2, 0x2e,
+       0xa2, 0xad, 0xf7, 0xf4, 0xa5, 0x8a, 0x3e, 0x23,
+       0x64, 0x08, 0xc8, 0xa1, 0xa0, 0xf0, 0x5d, 0x70,
+       0xd2, 0x77, 0xfd, 0xc8, 0x50, 0x83, 0x0f, 0xd6,
+       0x2b, 0xe4, 0x1f, 0x52, 0x34, 0x33, 0x68, 0xfd,
+       0x92, 0xbe, 0x9f, 0x97, 0x6b, 0x8d, 0x81, 0x91,
+       0x0f, 0xef, 0x65, 0xc8, 0x0d, 0x15, 0x01, 0x77,
+       0x58, 0xb2, 0xf4, 0x1b, 0x06, 0x7e, 0xf5, 0xca,
+       0x15, 0x2e, 0x38, 0xd8, 0x81, 0x1c, 0x1c, 0xa0,
+       0xb6, 0x13, 0x6a, 0x2b, 0x71, 0x34, 0x52, 0xd7,
+       0x1d, 0xbd, 0x37, 0x59, 0xbc, 0x86, 0x25, 0x2b,
+       0xa8, 0x93, 0xce, 0x1a, 0x03, 0x16, 0xfe, 0x01,
+       0x57, 0x99, 0x24, 0x25, 0x2c, 0xb3, 0xab, 0x1e,
+       0x2d, 0x65, 0x20, 0x89, 0x17, 0x02, 0x0e, 0x0a,
+       0xf5, 0x1e, 0xc7, 0xff, 0x1f, 0x61, 0xa9, 0x54,
+       0x18, 0xd4, 0xba, 0x50, 0x57, 0x02, 0xa1, 0xab,
+       0x22, 0x2e, 0x07, 0xea, 0xa9, 0xa3, 0x83, 0x4f,
+       0x27, 0xf5, 0xc5, 0xee, 0x3c, 0x3b, 0x10, 0xad,
+       0x32, 0x2b, 0x1c, 0x03, 0xcb, 0xaf, 0x98, 0x83,
+       0x54, 0xc3, 0x68, 0x63, 0xd4, 0xe0, 0x0e, 0x3c,
+       0x1a, 0x4e, 0xc0, 0x81, 0xd0, 0xe8, 0x6a, 0x62,
+       0x6b, 0x3e, 0x6f, 0xc4, 0xc6, 0x33, 0x4e, 0x26,
+       0x21, 0xf5, 0x04, 0xdf, 0xfa, 0xce, 0x45, 0xaf,
+       0xdc, 0x5e, 0x1b, 0xad, 0x93, 0xca, 0xf5, 0xcf,
+       0xd7, 0xee, 0x0c, 0x5c, 0x5e, 0xb4, 0xf0, 0x92,
+       0xd2, 0xf2, 0xf0, 0xa9, 0x1e, 0xab, 0x80, 0x68,
+       0x46, 0xef, 0xcc, 0x26, 0x0c, 0x5c, 0xdd, 0x4e,
+       0x83, 0xb8, 0xb9, 0x53, 0x6e, 0xf8, 0x93, 0x38,
+       0x67, 0xa4, 0x41, 0x87, 0x72, 0xe7, 0x7e, 0x86,
+       0xc9, 0x49, 0x00, 0x33, 0xb1, 0x38, 0x6c, 0x71,
+       0xd7, 0x1d, 0x8e, 0x61, 0x01, 0xb6, 0x57, 0xa9,
+       0xf1, 0xac, 0x15, 0xc2, 0x83, 0x77, 0xca, 0x64,
+       0xca, 0x7b, 0x6c, 0xa1, 0x10, 0x1b, 0x13, 0xd0,
+       0xd3, 0x9e, 0x9e, 0x10, 0x70, 0xc8, 0x1a, 0xbb,
+       0x3f, 0x19, 0x86, 0xab, 0x01, 0x0e, 0xea, 0x34,
+       0x22, 0xea, 0xe2, 0x15, 0xb7, 0xed, 0x21, 0x21,
+       0x75, 0xa5, 0xe7, 0x08, 0xa1, 0x38, 0xe0, 0x91,
+       0x05, 0x60, 0xea, 0xa7, 0x50, 0x27, 0x18, 0x07,
+       0x9d, 0xe0, 0x18, 0x2b, 0xd4, 0x07, 0x59, 0x00,
+       0xe6, 0x45, 0x18, 0x2a, 0x30, 0x6e, 0xf3, 0xb4,
+       0xd0, 0xef, 0xa6, 0x5b, 0x71, 0xa2, 0x5a, 0x3b,
+       0x89, 0x4c, 0xaf, 0x3f, 0xcb, 0x9f, 0x03, 0xfb,
+       0x43, 0x7c, 0x6b, 0xd3, 0x6a, 0xea, 0xce, 0x4a,
+       0x5f, 0x64, 0xb5, 0x62, 0xda, 0x5d, 0x27, 0xb7,
+       0xb8, 0x11, 0xca, 0x33, 0x30, 0xec, 0x70, 0xf0,
+       0x1b, 0x03, 0x50, 0xff, 0x5e, 0xa6, 0x08, 0xde,
+       0x37, 0x70, 0xc0, 0x81, 0x55, 0x60, 0x17, 0xa1,
+       0x85, 0xae, 0x26, 0x44, 0xe4, 0x67, 0x3c, 0x91,
+       0xfd, 0xc4, 0x3d, 0x97, 0x72, 0x23, 0xf3, 0x3c,
+       0x8f, 0xe0, 0xe2, 0xf2, 0x09, 0x96, 0x10, 0x67,
+       0xb5, 0xfe, 0xff, 0x3d, 0x4a, 0xc8, 0x62, 0x11,
+       0xa5, 0x98, 0xc1, 0x2d, 0x40, 0x82, 0x88, 0x8b,
+       0xe5, 0xb0, 0x75, 0xbf, 0x2f, 0xa8, 0x6a, 0x55,
+       0x49, 0x2e, 0x9c, 0x29, 0xd2, 0x7c, 0xbf, 0xf3,
+       0xaa, 0x3a, 0x16, 0x4a, 0xa4, 0x15, 0xf3, 0x48,
+       0xde, 0x38, 0x13, 0x44, 0x26, 0x02, 0xe6, 0xe9,
+       0xa8, 0x24, 0x89, 0xb5, 0x43, 0x95, 0xe4, 0x4c,
+       0xc3, 0xa0, 0xdf, 0xcc, 0x42, 0xf8, 0x8d, 0xb0,
+       0x3b, 0xea, 0x10, 0xb7, 0xe1, 0x40, 0x54, 0xb9,
+       0xa3, 0x2d, 0xfb, 0xb4, 0x91, 0xc0, 0x3e, 0x94,
+       0xf1, 0xa1, 0x3c, 0xbe, 0xef, 0xb8, 0x70, 0x55,
+       0x0a, 0x26, 0x93, 0xbf, 0xe6, 0x21, 0x92, 0x32,
+       0x3c, 0x39, 0x27, 0x6a, 0x23, 0x48, 0x02, 0x35,
+       0x3c, 0xd4, 0xcc, 0x04, 0xc0, 0x4e, 0xa7, 0x02,
+       0x63, 0x37, 0xc2, 0xb8, 0x56, 0x1d, 0x57, 0x57,
+       0x42, 0x04, 0x8d, 0xee, 0xcf, 0x8b, 0xc9, 0xc3,
+       0xba, 0x3b, 0x15, 0xd7, 0xaf, 0xbf, 0x9e, 0xcd,
+       0x44, 0xcf, 0xf0, 0x00, 0xb7, 0x3a, 0xfc, 0xa8,
+       0x12, 0xab, 0x3a, 0x62, 0x01, 0x21, 0x46, 0xe9,
+       0x1e, 0x48, 0x37, 0xfc, 0x13, 0x4d, 0xf6, 0x2a,
+       0x72, 0x40, 0x75, 0x38, 0x71, 0xf2, 0x17, 0x20,
+       0x2c, 0xdd, 0xc0, 0x49, 0xbc, 0x63, 0x33, 0xea,
+       0x06, 0x75, 0x41, 0xe7, 0x5c, 0x1f, 0xfb, 0xf9,
+       0x68, 0x83, 0xc2, 0x5a, 0x4a, 0x1e, 0x61, 0x08,
+       0x57, 0xf3, 0x00, 0xba, 0x77, 0x92, 0x63, 0xa5,
+       0xb7, 0xfe, 0x97, 0x22, 0xda, 0x5e, 0xd3, 0xaf,
+       0xbc, 0x89, 0x0d, 0x4c, 0x37, 0xa9, 0x27, 0x4a,
+       0x7f, 0xdb, 0x81, 0x39, 0x11, 0x86, 0x12, 0xf9,
+       0x10, 0x50, 0xe4, 0xdb, 0x72, 0xf9, 0xae, 0x10,
+       0x7c, 0xed, 0x50, 0x5c, 0x61, 0xeb, 0x42, 0x1e,
+       0xa4, 0xf4, 0xf0, 0xfa, 0x45, 0x4d, 0x95, 0x2b,
+       0xd4, 0x67, 0x4a, 0xe3, 0x8a, 0x15, 0x55, 0x92,
+       0x77, 0x64, 0x8c, 0x51, 0x38, 0xf9, 0x26, 0x3e,
+       0x68, 0xe2, 0xac, 0xbb, 0x64, 0x77, 0xe2, 0x82,
+       0xa4, 0x42, 0x41, 0x38, 0xa0, 0xf0, 0xc9, 0xd8,
+       0x6c, 0xe0, 0xef, 0x4c, 0xda, 0xb4, 0x92, 0xef,
+       0x1b, 0xe3, 0x9b, 0xc1, 0x44, 0x3c, 0xb9, 0xb7,
+       0x39, 0xac, 0x5c, 0x32, 0x39, 0xb4, 0x21, 0x85,
+       0x93, 0xbc, 0xf2, 0x51, 0x43, 0xb7, 0xae, 0x1e,
+       0x61, 0x9c, 0x38, 0x9c, 0xaa, 0xff, 0xde, 0xfc,
+       0xbf, 0x85, 0xef, 0x17, 0x34, 0x36, 0x71, 0x5f,
+       0x04, 0x16, 0xa6, 0x9e, 0xfd, 0x3a, 0x03, 0xd8,
+       0xbf, 0x71, 0x70, 0x20, 0x8f, 0x7c, 0xfb, 0xff,
+       0x61, 0xe0, 0xe2, 0x60, 0xa7, 0xb1, 0xc0, 0xe0,
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+       0x0c, 0xbe, 0x0f, 0x6a, 0xaf, 0xf3, 0x1b, 0x33,
+       0x4a, 0xb7, 0x68, 0x3f, 0xbe, 0x95, 0x13, 0x97,
+       0x0f, 0x15, 0x17, 0x1b, 0x23, 0xaa, 0x08, 0x78,
+       0xa6, 0x5b, 0x08, 0xa2, 0x9d, 0x03, 0xa8, 0xa7,
+       0x39, 0xdc, 0xbc, 0x9a, 0x85, 0xf5, 0xe5, 0x55,
+       0x59, 0x3c, 0xef, 0xf9, 0x3f, 0x22, 0x8e, 0xf8,
+       0xd8, 0x3e, 0x02, 0x0b, 0xd8, 0x78, 0x4b, 0x15,
+       0x7f, 0xaa, 0x2c, 0xff, 0xbe, 0x77, 0x33, 0xc7,
+       0x6a, 0x12, 0xaa, 0xa4, 0xbe, 0xc0, 0x3b, 0xcb,
+       0x13, 0x9d, 0x9c, 0x5a, 0x9f, 0x8a, 0x57, 0x36,
+       0x4f, 0x02, 0x5a, 0xf8, 0x1d, 0x97, 0x77, 0x43,
+       0xc8, 0xa5, 0xb7, 0x9b, 0x10, 0x98, 0xfd, 0x58,
+       0xbf, 0x42, 0xf6, 0xbf, 0xff, 0x6c, 0x40, 0x18,
+       0x18, 0xdf, 0xac, 0x57, 0x71, 0xea, 0xcc, 0x8e,
+       0xfd, 0xfe, 0x10, 0xfb, 0xb9, 0xfe, 0xbc, 0x9a,
+       0x9c, 0x27, 0xe4, 0x10, 0x15, 0x94, 0x41, 0xa1,
+       0xcc, 0xf6, 0x25, 0x49, 0x4f, 0x96, 0xc1, 0x8c,
+       0x9e, 0x3e, 0x18, 0x29, 0x49, 0x92, 0xe7, 0xfe,
+       0x22, 0xff, 0xed, 0x02, 0x16, 0x90, 0xef, 0xac,
+       0xec, 0x95, 0x1d, 0x5b, 0x94, 0x9c, 0xf6, 0x7c,
+       0x1b, 0x5a, 0x9d, 0xb0, 0x9b, 0x05, 0x36, 0xbf,
+       0xef, 0xec, 0x63, 0x35, 0x40, 0x24, 0x45, 0x40,
+       0x30, 0x1a, 0x9b, 0x90, 0xc3, 0xc2, 0xf7, 0x37,
+       0xfb, 0x08, 0x8e, 0x48, 0x19, 0x48, 0xed, 0xa8,
+       0xa8, 0x04, 0x6f, 0xd0, 0x33, 0xe9, 0xb8, 0x8d,
+       0xe7, 0x1e, 0x5c, 0x47, 0x74, 0xc0, 0x66, 0x30,
+       0x4e, 0xa7, 0x86, 0x73, 0xf1, 0xe5, 0x78, 0xa6,
+       0xe0, 0xc1, 0xda, 0x13, 0x72, 0x07, 0x85, 0x34,
+       0x63, 0x95, 0x49, 0x30, 0x4b, 0x9d, 0x03, 0xf1,
+       0x7a, 0x6b, 0x91, 0xa2, 0x85, 0x41, 0xf9, 0x4a,
+       0xd6, 0xff, 0xff, 0x86, 0xf7, 0xf0, 0xce, 0xb9,
+       0x07, 0xf1, 0x88, 0x04, 0x33, 0xaa, 0xeb, 0x54,
+       0xb2, 0x1c, 0x8e, 0x2e, 0x7b, 0x04, 0xa8, 0xcc,
+       0x2c, 0x7a, 0xb3, 0xad, 0x1a, 0x89, 0x38, 0x89,
+       0xd7, 0x11, 0x3a, 0x8c, 0xcf, 0xe3, 0xc5, 0xba,
+       0xb0, 0xcc, 0xc4, 0xe3, 0x33, 0xf3, 0x18, 0xba,
+       0xec, 0x56, 0xd9, 0x1c, 0x40, 0x70, 0x0d, 0x4e,
+       0x97, 0x01, 0x23, 0xf3, 0x5a, 0xdc, 0xbf, 0x68,
+       0x93, 0xc2, 0x1d, 0x8a, 0x96, 0xb7, 0xac, 0x18,
+       0x6f, 0xf7, 0x84, 0x71, 0x0d, 0x3d, 0xf8, 0xba,
+       0xdf, 0xb6, 0x89, 0x1d, 0x78, 0x19, 0xf2, 0x59,
+       0xe9, 0x15, 0x55, 0x29, 0x73, 0x50, 0x59, 0x14,
+       0x02, 0x21, 0x16, 0x8f, 0x0f, 0xdf, 0xa5, 0xf0,
+};
+
+static struct crc_test {
+       uint32_t crc;           /* random starting crc */
+       uint32_t start;         /* random offset in buf */
+       uint32_t length;        /* random length of test */
+       uint32_t crc_le;        /* expected crc32_le result */
+       uint32_t crc_be;        /* expected crc32_be result */
+} test[] = {
+       {0xffffffff, 0x00000000, 0x00001000, 0x13934bef, 0x14f3b75f},
+       {0xfe7328ea, 0x00000763, 0x00000717, 0xed2c0d70, 0x57531214},
+       {0x4c40684e, 0x00000721, 0x0000011e, 0xd7f46ccc, 0xedf12ec3},
+       {0x6b487f90, 0x00000264, 0x000007bc, 0x759e9939, 0x9af8e387},
+       {0x9f5810db, 0x00000afa, 0x00000255, 0x2685197f, 0x716de6ed},
+       {0xb15c4755, 0x00000d5b, 0x000002a4, 0xd8fadcb5, 0xfc34ae3f},
+       {0x06518253, 0x00000ffb, 0x00000004, 0xabee2433, 0xfa30ac9e},
+       {0xd9e71c55, 0x00000a2a, 0x00000259, 0x96682af2, 0xe5907ea3},
+       {0x0c1ae843, 0x00000ce4, 0x0000031b, 0x7b637c43, 0xe7f71b04},
+       {0xec3cd517, 0x000002ff, 0x00000566, 0x5d719a77, 0xed16e045},
+       {0x77828e95, 0x0000067f, 0x0000038f, 0x43ee5b6c, 0x35999927},
+       {0xec87b4e3, 0x00000d1c, 0x000002e3, 0x2ddd2eee, 0x9452d3f8},
+       {0x412158bb, 0x00000eee, 0x00000111, 0x67b38ba2, 0x177976d0},
+       {0x2e52de3e, 0x00000c4a, 0x000003b5, 0xbcc5d61d, 0xf60fee71},
+       {0x6ddaae8b, 0x00000d99, 0x00000266, 0x8b535544, 0x1dab8596},
+       {0x049b6cb1, 0x000009c5, 0x000000b0, 0xfc22cabc, 0x47ebc954},
+       {0x77d4b954, 0x0000028a, 0x000007fa, 0x71d00923, 0x905585ef},
+       {0x5e192355, 0x00000ac1, 0x000001fa, 0xb966b81a, 0x33c12903},
+       {0x7d80b71d, 0x00000213, 0x000001e0, 0x2bba371a, 0x5f4bd8d9},
+       {0x01f6f1e4, 0x000001d6, 0x00000395, 0xb7e8a647, 0x2a7943a1},
+       {0x1dfabb13, 0x00000e14, 0x000001eb, 0x53917fba, 0x8dee1e5d},
+       {0xb00a4449, 0x00000bf6, 0x00000409, 0xedecb577, 0x628e087d},
+       {0x7ecd3981, 0x0000083f, 0x0000016b, 0xefef62b9, 0xda4f94e6},
+       {0xf8f330d2, 0x000004be, 0x00000757, 0x9357c9f3, 0x8e2d5c2f},
+       {0x03c38af2, 0x00000d23, 0x000002dc, 0x360fa8c0, 0x6294c0d6},
+       {0x687bb79b, 0x00000f3d, 0x000000c2, 0x448d3be2, 0x08f48f3a},
+       {0x6710f550, 0x000009e9, 0x00000603, 0xdbfd1998, 0xc950ac29},
+       {0x873171d1, 0x00000787, 0x000004d5, 0xab7f1b62, 0xe66896ab},
+       {0x373b1314, 0x00000f0f, 0x000000f0, 0x184098ab, 0x4038e674},
+       {0x90fad9cd, 0x00000ead, 0x00000152, 0x23ce52ff, 0x9eff3974},
+       {0x19676fe7, 0x0000007d, 0x0000070d, 0xf8a76f1e, 0xfbc5c8a9},
+       {0x89facd45, 0x000005f3, 0x00000473, 0x4331a006, 0xb8f0f0cc},
+       {0x6f173747, 0x00000fc3, 0x0000003c, 0xb012f08e, 0x5126e378},
+       {0x4b44a106, 0x0000075a, 0x0000008b, 0xf6f7ac38, 0xf9b1781b},
+       {0xb620ad06, 0x00000774, 0x0000017e, 0xd34558e6, 0xb175edd3},
+       {0x976f21e9, 0x000008d7, 0x0000034a, 0xe533aa3a, 0x1e4367b9},
+       {0x687628c0, 0x000006c5, 0x0000061b, 0x3a840b15, 0xfb5989a0},
+       {0xe24ac108, 0x00000cd0, 0x0000032f, 0x51010ae8, 0xcdd8f182},
+       {0x361c44a3, 0x00000304, 0x00000719, 0xfd7bd481, 0x12de540f},
+       {0xd93ff95e, 0x00000db7, 0x0000008e, 0xcfbbc304, 0x42eecd5a},
+       {0xed752d12, 0x00000883, 0x00000091, 0x65a6c868, 0x9ebfa578},
+       {0xb4ff4b54, 0x000003d3, 0x000001c1, 0xf82597e7, 0xa8ad2b19},
+       {0x111b520f, 0x00000708, 0x000000eb, 0xc3e109f3, 0x323ace17},
+       {0x62c806f2, 0x00000ba3, 0x0000045c, 0x874d3a72, 0xaf1a1360},
+       {0x40d97470, 0x000005e1, 0x0000058d, 0x87a9684f, 0x524244a8},
+       {0x4312179c, 0x00000056, 0x0000070e, 0x809a00f5, 0xf9e940b0},
+       {0x13d5f84c, 0x00000a2d, 0x00000104, 0xf3d27578, 0x5d33341c},
+       {0x1f302cb2, 0x00000151, 0x00000014, 0x1e162693, 0x53c3cfc3},
+       {0xe491db24, 0x00000600, 0x000006f6, 0x7ff09615, 0xa300ecf7},
+       {0xf9a98069, 0x000002ba, 0x000002ad, 0x01af7387, 0x31c0911e},
+       {0xe9c477ad, 0x0000015f, 0x00000778, 0x6facf9a0, 0x1993b688},
+       {0x353f32b2, 0x0000087c, 0x00000783, 0x6cc964ea, 0x418db561},
+       {0x78e1b24f, 0x00000650, 0x000006a8, 0xb3bb7c27, 0xf2aad006},
+       {0x61aa400e, 0x00000049, 0x00000254, 0xb8cd1681, 0x79150b15},
+       {0xb84b10b0, 0x00000f73, 0x0000008c, 0x406a6450, 0x0c705222},
+       {0x9fa99c9c, 0x00000a7c, 0x000004d7, 0xfb3d21b4, 0xe4e789df},
+       {0x3fc9ebe3, 0x00000cd9, 0x000000d6, 0x43803f9c, 0x5a152be5},
+       {0x529879cd, 0x000002f2, 0x00000595, 0x78b4c6a6, 0xf7236ec4},
+       {0x3a933019, 0x00000516, 0x00000266, 0xdcb45436, 0x2c7935f5},
+       {0x887b4977, 0x00000227, 0x0000038d, 0xc5f7c3d9, 0x0d6d7df6},
+       {0x770745de, 0x000008c6, 0x00000739, 0xf69145e8, 0x47d5efc9},
+       {0x28be3b47, 0x00000c46, 0x0000032b, 0x764c028f, 0x1eb70d64},
+       {0x5013a050, 0x00000cf6, 0x00000309, 0xea8fe164, 0x186affa4},
+       {0x2ec4c9ba, 0x000006e8, 0x0000078d, 0xa35557a9, 0xb41f49ec},
+       {0xa9f950c9, 0x00000d33, 0x000002cc, 0x41ea8618, 0xab8dfae3},
+       {0x5b520229, 0x000007b2, 0x00000484, 0x44569f1f, 0x607a8052},
+       {0xd8dcbbfc, 0x0000002f, 0x0000048c, 0xdb88ab8b, 0xf1c411f1},
+       {0x25529792, 0x00000d1d, 0x000002e2, 0x20cda404, 0x32683a2d},
+       {0x9f3f6d71, 0x00000238, 0x0000079a, 0x0720443e, 0x4b8ba2ff},
+       {0x64121215, 0x000007ff, 0x0000038f, 0x6aacff2c, 0x3b84233b},
+       {0xfb6cdde0, 0x00000ef8, 0x00000107, 0xbd43a0f1, 0x926624d0},
+       {0x221c9d6f, 0x000007b6, 0x0000014f, 0xb67f834b, 0x2bdedda4},
+       {0x030e1de4, 0x00000836, 0x000004b4, 0x0d67d26a, 0x75a73b73},
+       {0xb56fa6cf, 0x00000c07, 0x000003f8, 0x60601ac1, 0x10a43f35},
+       {0xb55c89f5, 0x0000098e, 0x000001d4, 0x2400efbe, 0x006e28eb},
+       {0x5e90b6d5, 0x0000070b, 0x000003ea, 0x3bb5d6ea, 0xb175fa6b},
+       {0x2a7045ae, 0x00000961, 0x00000633, 0xfca89e4b, 0x962cd6d2},
+       {0x8b374ea9, 0x000006ba, 0x00000780, 0xbce036ed, 0x4dc8279b},
+       {0x8bd90bc9, 0x00000562, 0x00000369, 0xcb26a24b, 0x50dee743},
+       {0x5b1b1762, 0x000000fd, 0x0000051a, 0x33cdda07, 0xee75ff7b},
+       {0xa4153555, 0x0000058f, 0x000005c7, 0xbe50eeca, 0xe73fffcc},
+       {0x0be1f931, 0x00000651, 0x00000672, 0x95a25753, 0x4ad6270f},
+       {0xb7e78618, 0x00000a7f, 0x000002bb, 0xe06bcc1c, 0x1a35ee59},
+       {0x4a9bc41b, 0x00000e51, 0x000001ae, 0x709e8d2c, 0x75080ca8},
+       {0xfc359d13, 0x00000440, 0x000002f8, 0x0a58451f, 0x6fa3cfbf},
+       {0x5aa48619, 0x000006d1, 0x00000284, 0x928ead83, 0xbd600efc},
+       {0xa609afa8, 0x0000053e, 0x00000272, 0xb048c141, 0x184f80bb},
+       {0x3f108afb, 0x00000949, 0x00000150, 0x9a6bb5bc, 0x0ea02be1},
+       {0x79bec2d3, 0x000008ed, 0x00000712, 0x32692d57, 0x2eb13289},
+       {0x9429e067, 0x00000bc3, 0x0000043c, 0x5295ceff, 0x8a9014a7},
+       {0xae58b96a, 0x0000082d, 0x000007d2, 0xc2a681ba, 0x6af94089},
+       {0x95df24be, 0x00000985, 0x000004c1, 0x3a287765, 0x379fcb42},
+       {0x5e94976f, 0x00000596, 0x000004ed, 0xff00c489, 0x991fc1f5},
+       {0xf5e5f1de, 0x00000d31, 0x000002ce, 0x35f28e91, 0x543def1a},
+       {0xa2c219cf, 0x00000a3c, 0x00000374, 0x707d21eb, 0xa6d28bc1},
+       {0xf21b6ceb, 0x00000919, 0x00000135, 0x0847fb8b, 0x224468c2},
+       {0xaa988728, 0x00000787, 0x00000771, 0x885aeaa4, 0x814db00b},
+       {0xaa5dfaac, 0x000003e5, 0x0000051b, 0x52c48ab7, 0x725bef8a},
+       {0x0a053968, 0x00000d2a, 0x000002d5, 0x7a90256d, 0xc53b9402},
+       {0x1421dc20, 0x00000eef, 0x00000110, 0x97d6da24, 0x10846935},
+       {0xb47c2166, 0x00000a6a, 0x00000209, 0xcfd6cc52, 0x46e2797e},
+       {0x77dd1955, 0x000000de, 0x00000266, 0xba74bcaa, 0x4fa3fe9c},
+       {0x68a03cc2, 0x0000082f, 0x000007b0, 0x752bd5d8, 0x4f760c63},
+       {0x0226b0a3, 0x00000a5f, 0x000005a0, 0x82de4970, 0x8ee1310e},
+       {0x637bf3b1, 0x00000d93, 0x0000026c, 0x5c7115cb, 0x9f6a0ced},
+       {0x3b120edf, 0x00000c13, 0x000003ec, 0x80d7d20f, 0x241657d5},
+       {0xe2456780, 0x000002eb, 0x00000641, 0xc0a5d289, 0x74df96b4},
+       {0x9b2e7125, 0x00000c0c, 0x000003f3, 0xcc15f57e, 0x03e290bf},
+       {0x153033ef, 0x00000787, 0x000006b6, 0x3cde443b, 0x7bf1d121},
+       {0x18458b3f, 0x0000066c, 0x00000561, 0x9a2bd8c6, 0x9d564bef},
+       {0x4ff9d4b9, 0x00000c8f, 0x0000033a, 0xd0ee6d6d, 0xee00aa0b},
+       {0xdf84b5d9, 0x00000802, 0x0000029a, 0xdab0d74a, 0xd0cb63dc},
+       {0x81ee15df, 0x000003ce, 0x00000725, 0x9942e2de, 0xe48fb26b},
+       {0x5c768e04, 0x00000afd, 0x00000160, 0x36110831, 0x8dc74483},
+       {0xe5e18094, 0x00000b4b, 0x000000a0, 0xffa3e4a7, 0xc0145e1b},
+       {0xed7263b6, 0x00000d0d, 0x000002f2, 0xb0006a35, 0x5468ae3a},
+       {0x5bfde7d7, 0x000006fb, 0x00000554, 0xa4193b76, 0xb73d34b2},
+       {0x67f4a743, 0x00000b85, 0x0000047a, 0xf05c8d8f, 0x4f843e49},
+       {0xf13bdf22, 0x00000ff7, 0x00000008, 0x816351eb, 0x41f537f6},
+       {0x08ecc608, 0x00000d5d, 0x00000098, 0x90492772, 0xf5172204},
+       {0x296f52ba, 0x000004f9, 0x00000788, 0x5e5a4896, 0xe01d5b46},
+       {0xbe4624c2, 0x00000427, 0x000004ef, 0xcd267b94, 0x7b9069f4},
+       {0x906f7c7c, 0x00000a05, 0x0000003f, 0x03fcfc33, 0x7b6ff563},
+       {0x8f7b323e, 0x00000458, 0x000004c7, 0xcd4969c8, 0xd4c22ada},
+       {0x88d6593d, 0x00000597, 0x000005b5, 0xf199cd3b, 0x5c3e8ca2},
+       {0x978a7768, 0x00000268, 0x000001d3, 0xb28c95bd, 0x49a2cc67},
+       {0x857a621e, 0x000007a7, 0x000003a8, 0xf4bf84ab, 0xde26f369},
+       {0xb0e121ef, 0x000005be, 0x00000644, 0x28747c14, 0x61d4dc6b},
+       {0, 0, 0, 0, 0},
+};
+
+static int test_crc32c(void)
+{
+       struct crc_test *t = test;
+       int failures = 0;
+
+       while (t->length) {
+               uint32_t be, le;
+               le = ext2fs_crc32c_le(t->crc, test_buf + t->start, t->length);
+               be = ext2fs_crc32c_be(t->crc, test_buf + t->start, t->length);
+               if (le != t->crc_le) {
+                       printf("Test %d LE fails, %x != %x\n",
+                              (t - test), le, t->crc_le);
+                       failures++;
+               }
+               if (be != t->crc_be) {
+                       printf("Test %d BE fails, %x != %x\n",
+                              (t - test), be, t->crc_be);
+                       failures++;
+               }
+               t++;
+       }
+
+       return failures;
+}
+
+int main(int argc, char *argv[])
+{
+       int ret;
+
+       ret = test_crc32c();
+       if (!ret)
+               printf("No failures.\n");
+
+       return ret;
+}
+#endif /* UNITTEST */
diff --git a/lib/ext2fs/crc32c_defs.h b/lib/ext2fs/crc32c_defs.h
new file mode 100644 (file)
index 0000000..1752970
--- /dev/null
@@ -0,0 +1,67 @@
+/*
+ * This is the CRC32c polynomial, as outlined by Castagnoli.
+ * x^32+x^28+x^27+x^26+x^25+x^23+x^22+x^20+x^19+x^18+x^14+x^13+x^11+x^10+x^9+
+ * x^8+x^6+x^0
+ */
+#define CRCPOLY_LE 0x82F63B78
+#define CRCPOLY_BE 0x1EDC6F41
+
+/* How many bits at a time to use.  Valid values are 1, 2, 4, 8, 32 and 64. */
+/* For less performance-sensitive, use 4 */
+#ifndef CRC_LE_BITS
+# define CRC_LE_BITS 64
+#endif
+#ifndef CRC_BE_BITS
+# define CRC_BE_BITS 64
+#endif
+
+/*
+ * Little-endian CRC computation.  Used with serial bit streams sent
+ * lsbit-first.  Be sure to use cpu_to_le32() to append the computed CRC.
+ */
+#if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \
+       CRC_LE_BITS & CRC_LE_BITS-1
+# error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32, 64}"
+#endif
+
+/*
+ * Big-endian CRC computation.  Used with serial bit streams sent
+ * msbit-first.  Be sure to use cpu_to_be32() to append the computed CRC.
+ */
+#if CRC_BE_BITS > 64 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \
+       CRC_BE_BITS & CRC_BE_BITS-1
+# error "CRC_BE_BITS must be one of {1, 2, 4, 8, 32, 64}"
+#endif
+
+
+#define ___constant_swab32(x) \
+       ((uint32_t)( \
+               (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \
+               (((uint32_t)(x) & (uint32_t)0x0000ff00UL) <<  8) | \
+               (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >>  8) | \
+               (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24)))
+
+
+#ifdef WORDS_BIGENDIAN
+#define __constant_cpu_to_le32(x) ___constant_swab32((x))
+#define __constant_cpu_to_be32(x) (x)
+#define __be32_to_cpu(x) (x)
+#define __cpu_to_be32(x) (x)
+#define __cpu_to_le32(x) (htole32((x)))
+#define __le32_to_cpu(x) (le32toh((x)))
+#else
+#define __constant_cpu_to_le32(x) (x)
+#define __constant_cpu_to_be32(x) ___constant_swab32((x))
+#define __be32_to_cpu(x) (be32toh((x)))
+#define __cpu_to_be32(x) (htobe32((x)))
+#define __cpu_to_le32(x) (x)
+#define __le32_to_cpu(x) (x)
+#endif
+
+#if (__GNUC__ >= 3)
+#define likely(x)      __builtin_expect(!!(x), 1)
+#define unlikely(x)    __builtin_expect(!!(x), 0)
+#else
+#define likely(x)      (x)
+#define unlikely(x)    (x)
+#endif
index 9d68cbe..9c0160f 100644 (file)
@@ -884,6 +884,10 @@ extern int ext2fs_super_and_bgd_loc(ext2_filsys fs,
                                    int *ret_meta_bg);
 extern void ext2fs_update_dynamic_rev(ext2_filsys fs);
 
+/* crc32c.c */
+extern __u32 crc32c_be(__u32 crc, unsigned char const *p, size_t len);
+extern __u32 crc32c_le(__u32 crc, unsigned char const *p, size_t len);
+
 /* csum.c */
 extern void ext2fs_group_desc_csum_set(ext2_filsys fs, dgrp_t group);
 extern int ext2fs_group_desc_csum_verify(ext2_filsys fs, dgrp_t group);
diff --git a/lib/ext2fs/gen_crc32ctable.c b/lib/ext2fs/gen_crc32ctable.c
new file mode 100644 (file)
index 0000000..9996e9d
--- /dev/null
@@ -0,0 +1,123 @@
+#include <stdio.h>
+#include "crc32c_defs.h"
+#include <inttypes.h>
+
+#define ENTRIES_PER_LINE 4
+
+#if CRC_LE_BITS <= 8
+#define LE_TABLE_SIZE (1 << CRC_LE_BITS)
+#else
+#define LE_TABLE_SIZE 256
+#endif
+
+#if CRC_BE_BITS <= 8
+#define BE_TABLE_SIZE (1 << CRC_BE_BITS)
+#else
+#define BE_TABLE_SIZE 256
+#endif
+
+static uint32_t crc32ctable_le[8][256];
+static uint32_t crc32ctable_be[8][256];
+
+/**
+ * crc32cinit_le() - allocate and initialize LE table data
+ *
+ * crc is the crc of the byte i; other entries are filled in based on the
+ * fact that crctable[i^j] = crctable[i] ^ crctable[j].
+ *
+ */
+static void crc32cinit_le(void)
+{
+       unsigned i, j;
+       uint32_t crc = 1;
+
+       crc32ctable_le[0][0] = 0;
+
+       for (i = LE_TABLE_SIZE >> 1; i; i >>= 1) {
+               crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
+               for (j = 0; j < LE_TABLE_SIZE; j += 2 * i)
+                       crc32ctable_le[0][i + j] = crc ^ crc32ctable_le[0][j];
+       }
+       for (i = 0; i < LE_TABLE_SIZE; i++) {
+               crc = crc32ctable_le[0][i];
+               for (j = 1; j < 8; j++) {
+                       crc = crc32ctable_le[0][crc & 0xff] ^ (crc >> 8);
+                       crc32ctable_le[j][i] = crc;
+               }
+       }
+}
+
+/**
+ * crc32cinit_be() - allocate and initialize BE table data
+ */
+static void crc32cinit_be(void)
+{
+       unsigned i, j;
+       uint32_t crc = 0x80000000;
+
+       crc32ctable_be[0][0] = 0;
+
+       for (i = 1; i < BE_TABLE_SIZE; i <<= 1) {
+               crc = (crc << 1) ^ ((crc & 0x80000000) ? CRCPOLY_BE : 0);
+               for (j = 0; j < i; j++)
+                       crc32ctable_be[0][i + j] = crc ^ crc32ctable_be[0][j];
+       }
+       for (i = 0; i < BE_TABLE_SIZE; i++) {
+               crc = crc32ctable_be[0][i];
+               for (j = 1; j < 8; j++) {
+                       crc = crc32ctable_be[0][(crc >> 24) & 0xff] ^
+                             (crc << 8);
+                       crc32ctable_be[j][i] = crc;
+               }
+       }
+}
+
+static void output_table(uint32_t table[8][256], int len, char trans)
+{
+       int i, j;
+
+       for (j = 0 ; j < 8; j++) {
+               printf("static const uint32_t t%d_%ce[] = {", j, trans);
+               for (i = 0; i < len - 1; i++) {
+                       if ((i % ENTRIES_PER_LINE) == 0)
+                               printf("\n");
+                       printf("to%ce(0x%8.8xL),", trans, table[j][i]);
+                       if ((i % ENTRIES_PER_LINE) != (ENTRIES_PER_LINE - 1))
+                               printf(" ");
+               }
+               printf("to%ce(0x%8.8xL)};\n\n", trans, table[j][len - 1]);
+
+               if (trans == 'l') {
+                       if ((j+1)*8 >= CRC_LE_BITS)
+                               break;
+               } else {
+                       if ((j+1)*8 >= CRC_BE_BITS)
+                               break;
+               }
+       }
+}
+
+int main(int argc, char **argv)
+{
+       printf("/*\n");
+       printf(" * crc32ctable.h - CRC32c tables\n");
+       printf(" *    this file is generated - do not edit\n");
+       printf(" *      # gen_crc32ctable > crc32c_table.h\n");
+       printf(" *    with\n");
+       printf(" *      CRC_LE_BITS = %d\n", CRC_LE_BITS);
+       printf(" *      CRC_BE_BITS = %d\n", CRC_BE_BITS);
+       printf(" */\n");
+       printf("#include <stdint.h>\n");
+
+       if (CRC_LE_BITS > 1) {
+               crc32cinit_le();
+               output_table(crc32ctable_le, LE_TABLE_SIZE, 'l');
+       }
+
+       if (CRC_BE_BITS > 1) {
+               crc32cinit_be();
+               output_table(crc32ctable_be, BE_TABLE_SIZE, 'b');
+       }
+
+       return 0;
+}