[PATCH 1/2] Add generic LE/BE load store uint type convertors

Max max.suraev at fairwaves.ru
Wed Feb 5 19:08:23 UTC 2014


---
 .gitignore                          |   2 +-
 include/osmocom/core/bitXXgen.h.tpl | 100 ++++++++++++++++++++++++++++++++++++
 include/osmocom/core/bits.h         |  45 +++++++++++++++-
 tests/bits/bitrev_test.c            |  92 ++++++++++++++++++++++++++++++++-
 tests/bits/bitrev_test.ok           |  22 ++++++++
 5 files changed, 257 insertions(+), 4 deletions(-)
 create mode 100644 include/osmocom/core/bitXXgen.h.tpl

diff --git a/.gitignore b/.gitignore
index 71b27f2..c85d04d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -89,7 +89,7 @@ doc/html.tar
 
 src/crc*gen.c
 include/osmocom/core/crc*gen.h
-
+include/osmocom/core/bit*gen.h
 
 # vi files
 *.sw?
diff --git a/include/osmocom/core/bitXXgen.h.tpl b/include/osmocom/core/bitXXgen.h.tpl
new file mode 100644
index 0000000..5714251
--- /dev/null
+++ b/include/osmocom/core/bitXXgen.h.tpl
@@ -0,0 +1,100 @@
+/*
+ * bitXXgen.h
+ *
+ * Copyright (C) 2014  Max <max.suraev at fairwaves.ru>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+
+/* Load unaligned n-byte integer (little-endian encoding) into uintXX_t */
+static inline uintXX_t osmo_loadXXle_ext(const uint8_t *p, uint8_t n)
+{
+	uint8_t i;
+	uintXX_t r = 0;
+	for(i = 0; i < n; r |= ((uintXX_t)p[i] << (8 * i)), i++);
+	return r;
+}
+
+/* Load unaligned n-byte integer (big-endian encoding) into uintXX_t */
+static inline uintXX_t osmo_loadXXbe_ext(const uint8_t *p, uint8_t n)
+{
+	uint8_t i;
+	uintXX_t r = 0;
+	for(i = 0; i < n; r |= ((uintXX_t)p[i] << (XX - 8* (1 + i))), i++);
+	return r;
+}
+
+
+/* Store unaligned n-byte integer (little-endian encoding) into uintXX_t */
+static inline void osmo_storeXXle_ext(uintXX_t x, uint8_t *p, uint8_t n)
+{
+
+
+	uint8_t i;
+	for(i = 0; i < n; p[i] = (x >> i * 8) & 0xFF, i++);
+/*
+
+	uint8_t i, adj = 8 * (8 - n);
+	uintXX_t y = (x << adj) >> adj;
+	for(i = 0; i < n; p[i] = (y >> i * 8) & 0xFF, i++);
+*/
+}
+
+/* Store unaligned n-byte integer (big-endian encoding) into uintXX_t */
+static inline void osmo_storeXXbe_ext(uintXX_t x, uint8_t *p, uint8_t n)
+{
+	uint8_t i;
+	for(i = 0; i < n; p[i] = (x >> ((n - 1 - i) * 8)) & 0xFF, i++);
+
+/*
+	uint8_t i, adj = 8 * (8 - n);
+	uintXX_t y = (x << adj) >> adj;
+	for(i = 0; i < n; p[i] = (y >> ((n - 1 - i) * 8)) & 0xFF, i++);
+*/
+}
+
+
+/* Convenience function for most-used cases */
+
+
+/* Load unaligned XX-bit integer (little-endian encoding) */
+static inline uintXX_t osmo_loadXXle(const uint8_t *p)
+{
+	return osmo_loadXXle_ext(p, XX / 8);
+}
+
+/* Load unaligned XX-bit integer (big-endian encoding) */
+static inline uintXX_t osmo_loadXXbe(const uint8_t *p)
+{
+	return osmo_loadXXbe_ext(p, XX / 8);
+}
+
+
+/* Store unaligned XX-bit integer (little-endian encoding) */
+static inline void osmo_storeXXle(uintXX_t x, uint8_t *p)
+{
+	return osmo_storeXXle_ext(x, p, XX / 8);
+}
+
+/* Store unaligned XX-bit integer (big-endian encoding) */
+static inline void osmo_storeXXbe(uintXX_t x, uint8_t *p)
+{
+	return osmo_storeXXbe_ext(x, p, XX / 8);
+}
+
+
diff --git a/include/osmocom/core/bits.h b/include/osmocom/core/bits.h
index 4c68532..c636d71 100644
--- a/include/osmocom/core/bits.h
+++ b/include/osmocom/core/bits.h
@@ -2,7 +2,9 @@
 #define _OSMO_BITS_H
 
 #include <stdint.h>
-
+#include <stddef.h>
+#include <osmocom/core/bit32gen.h>
+#include <osmocom/core/bit64gen.h>
 /*! \defgroup bits soft, unpacked and packed bits
  *  @{
  */
@@ -15,6 +17,37 @@ typedef int8_t  sbit_t;		/*!< \brief soft bit (-127...127) */
 typedef uint8_t ubit_t;		/*!< \brief unpacked bit (0 or 1) */
 typedef uint8_t pbit_t;		/*!< \brief packed bis (8 bits in a byte) */
 
+/* Load unaligned 16-bit integer (little-endian encoding) */
+static inline uint16_t osmo_load16le(const uint8_t *p)
+{
+	return p[0] | (p[1] << 8);
+}
+
+/* Load unaligned 16-bit integer (big-endian encoding) */
+static inline uint16_t osmo_load16be(const uint8_t *p)
+{
+	return (p[0] << 8) | p[1];
+}
+
+/* Store unaligned 16-bit integer (little-endian encoding) */
+static inline void osmo_store16le(uint16_t a, uint8_t *p)
+{
+	p[0] = a & 0xFF;
+	p[1] = (a >> 8) & 0xFF;
+}
+
+/* Store unaligned 16-bit integer (big-endian encoding) */
+static inline void osmo_store16be(uint16_t a, uint8_t *p)
+{
+	p[0] = (a >> 8) & 0xFF;
+	p[1] = a & 0xFF;
+}
+
+/*
+   Less trivial LE/BE functions are autogenerated
+   see included bitXXgen.h files
+*/
+
 /*
    NOTE on the endianess of pbit_t:
    Bits in a pbit_t are ordered MSB first, i.e. 0x80 is the first bit.
@@ -73,6 +106,16 @@ uint32_t osmo_revbytebits_8(uint8_t x);
 /* \brief reverse the bits of each byte in a given buffer */
 void osmo_revbytebits_buf(uint8_t *buf, int len);
 
+/* \brief reverse the order of the bytes in a given buffer */
+void osmo_revbytes_buf(uint8_t *buf, size_t len);
+
+/* \brief left circular shift */
+static inline uint16_t rol16(uint16_t in, unsigned shift)
+{
+    return (in << shift) | (in >> (16 - shift));
+}
+
+
 /*! @} */
 
 #endif /* _OSMO_BITS_H */
diff --git a/tests/bits/bitrev_test.c b/tests/bits/bitrev_test.c
index 5eca990..6cf340e 100644
--- a/tests/bits/bitrev_test.c
+++ b/tests/bits/bitrev_test.c
@@ -1,8 +1,9 @@
-
+#include <inttypes.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
 #include <string.h>
+#include <time.h>
 
 #include <osmocom/core/utils.h>
 #include <osmocom/core/bits.h>
@@ -10,11 +11,66 @@
 static const uint8_t input[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 };
 static const uint8_t exp_out[] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
 
+char s[18], *p;
+
+void check_ls_64(uint8_t bytes)
+{
+	uint8_t T[bytes], D = (8 - bytes), A = 8 * D, C = 2 * D;
+	uint64_t _test = ((uint64_t)rand() << 32) + rand(), a_test = (_test << A) >> A;
+
+	osmo_store64be_ext(_test, T, bytes);
+	snprintf(s, 17, "%.16" PRIx64, a_test);
+	p = osmo_hexdump_nospc(T, bytes);
+	if (0 != memcmp(s + C, p, bytes)) {
+		printf("%s\t%s\t%u BE store FAILED!\n", s + C, p, bytes * 8);
+	} else printf("%u BE store OK\n", bytes * 8);
+
+	osmo_store64le_ext(_test, T, bytes);
+	if (osmo_load64le_ext(T, bytes) == a_test)
+		printf("%u LE OK\n", bytes * 8);
+	else
+		printf("%u LE FAILED on %s- loaded %.16" PRIx64 " instead of %.16" PRIx64 "\n", bytes * 8, osmo_hexdump(T, bytes), osmo_load64le_ext(T, bytes), a_test);
+
+	osmo_store64be_ext(_test, T, bytes);
+	if (osmo_load64be_ext(T, bytes) == (a_test << A))
+		printf("%u BE OK\n", bytes * 8);
+	else
+		printf("%u BE FAILED on %s- loaded %.16" PRIx64 " instead of %.16" PRIx64 "\n", bytes * 8, osmo_hexdump(T, bytes), osmo_load64be_ext(T, bytes), (a_test << A));
+}
+
+void check_ls_32(uint8_t bytes)
+{
+	uint8_t T[bytes], D = (4 - bytes), A = 8 * D, C = 2 * D;
+	uint32_t _test = rand(), a_test = (_test << A) >> A;
+
+	osmo_store32be_ext(_test, T, bytes);
+	snprintf(s, 17, "%.8" PRIx32, a_test);
+	p = osmo_hexdump_nospc(T, bytes);
+	if (0 != memcmp(s + C, p, bytes)) {
+		printf("%s\t%s\t%u BE store FAILED on %" PRIx32 "\n", s + C, p, bytes * 8, _test);
+	} else printf("%u BE store OK\n", bytes * 8);
+
+	osmo_store32le_ext(_test, T, bytes);
+	if (osmo_load32le_ext(T, bytes) == a_test)
+		printf("%u LE OK\n", bytes * 8);
+	else
+		printf("%u LE FAILED on %s- loaded %.8" PRIx32 " instead of %.8" PRIx32 "\n", bytes * 8, osmo_hexdump(T, bytes), osmo_load32le_ext(T, bytes), a_test);
+
+	osmo_store32be_ext(_test, T, bytes);
+	if (osmo_load32be_ext(T, bytes) == (a_test << A))
+		printf("%u BE OK\n", bytes * 8);
+	else
+		printf("%u BE FAILED on %s- loaded %.8" PRIx32 " instead of %.8" PRIx32 "\n", bytes * 8, osmo_hexdump(T, bytes), osmo_load32be_ext(T, bytes), (a_test << A));
+}
+
 int main(int argc, char **argv)
 {
-	uint8_t out[ARRAY_SIZE(input)];
+	uint8_t out[ARRAY_SIZE(input)], test[8];
 	unsigned int offs;
 
+
+	srand(time(NULL));
+
 	for (offs = 0; offs < sizeof(out); offs++) {
 		uint8_t *start = out + offs;
 		uint8_t len = sizeof(out) - offs;
@@ -32,5 +88,37 @@ int main(int argc, char **argv)
 		printf("\n");
 	}
 
+	printf("checking byte packing...\n");
+
+	check_ls_64(8);
+	check_ls_64(7);
+	check_ls_64(6);
+	check_ls_64(5);
+	check_ls_32(4);
+	check_ls_32(3);
+
+	uint16_t _test16 = (uint16_t)rand();
+	osmo_store16be(_test16, test);
+
+	snprintf(s, 17, "%.4" PRIx16, _test16);
+	p = osmo_hexdump_nospc(test, 2);
+	if (0 != memcmp(s, p, 2)) {
+		printf ("%s\t", s);
+		printf ("%s\t", p);
+		printf("16 BE FAILED on %" PRIx16 "\n");
+	} else printf("16 BE store OK\n");
+
+	osmo_store16le(_test16, test);
+	if (osmo_load16le(test) == _test16)
+		printf("16 LE OK\n");
+	else
+		printf("16 LE FAILED: %s, %.4" PRIx16 ", %.4" PRIx16 "\n", osmo_hexdump(test, 2), osmo_load16le(test), _test16);
+
+	osmo_store16be(_test16, test);
+	if (osmo_load16be(test) == _test16)
+		printf("16 BE OK\n");
+	else
+		printf("16 BE FAILED: %s, %.4" PRIx16 ", %.4" PRIx16 "\n", osmo_hexdump(test, 2), osmo_load16be(test), _test16);
+
 	return 0;
 }
diff --git a/tests/bits/bitrev_test.ok b/tests/bits/bitrev_test.ok
index 47f402f..0cbc4db 100644
--- a/tests/bits/bitrev_test.ok
+++ b/tests/bits/bitrev_test.ok
@@ -22,3 +22,25 @@ REVERSED: 02 01
 INORDER:  80 
 REVERSED: 01 
 
+checking byte packing...
+64 BE store OK
+64 LE OK
+64 BE OK
+56 BE store OK
+56 LE OK
+56 BE OK
+48 BE store OK
+48 LE OK
+48 BE OK
+40 BE store OK
+40 LE OK
+40 BE OK
+32 BE store OK
+32 LE OK
+32 BE OK
+24 BE store OK
+24 LE OK
+24 BE OK
+16 BE store OK
+16 LE OK
+16 BE OK
-- 
1.8.3.2


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