1 files changed, 105 insertions, 0 deletions
diff --git a/lib/decoding/osmocom/core/bit32gen.h b/lib/decoding/osmocom/core/bit32gen.h
new file mode 100644
index 0000000..6640e76
--- /dev/null
+++ b/lib/decoding/osmocom/core/bit32gen.h
@@ -0,0 +1,105 @@
+/*
+ * bit32gen.h
+ *
+ * Copyright (C) 2014  Max <max.suraev@fairwaves.co>
+ *
+ * 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.
+ */
+
+#pragma once
+
+/*! \brief load unaligned n-byte integer (little-endian encoding) into uint32_t
+ *  \param[in] p Buffer where integer is stored
+ *  \param[in] n Number of bytes stored in p
+ *  \returns 32 bit unsigned integer
+ */
+static inline uint32_t osmo_load32le_ext(const void *p, uint8_t n)
+{
+	uint8_t i;
+	uint32_t r = 0;
+	const uint8_t *q = (uint8_t *)p;
+	for(i = 0; i < n; r |= ((uint32_t)q[i] << (8 * i)), i++);
+	return r;
+}
+
+/*! \brief load unaligned n-byte integer (big-endian encoding) into uint32_t
+ *  \param[in] p Buffer where integer is stored
+ *  \param[in] n Number of bytes stored in p
+ *  \returns 32 bit unsigned integer
+ */
+static inline uint32_t osmo_load32be_ext(const void *p, uint8_t n)
+{
+	uint8_t i;
+	uint32_t r = 0;
+	const uint8_t *q = (uint8_t *)p;
+	for(i = 0; i < n; r |= ((uint32_t)q[i] << (32 - 8* (1 + i))), i++);
+	return r;
+}
+
+
+/*! \brief store unaligned n-byte integer (little-endian encoding) from uint32_t
+ *  \param[in] x unsigned 32 bit integer
+ *  \param[out] p Buffer to store integer
+ *  \param[in] n Number of bytes to store
+ */
+static inline void osmo_store32le_ext(uint32_t x, void *p, uint8_t n)
+{
+	uint8_t i;
+	uint8_t *q = (uint8_t *)p;
+	for(i = 0; i < n; q[i] = (x >> i * 8) & 0xFF, i++);
+}
+
+/*! \brief store unaligned n-byte integer (big-endian encoding) from uint32_t
+ *  \param[in] x unsigned 32 bit integer
+ *  \param[out] p Buffer to store integer
+ *  \param[in] n Number of bytes to store
+ */
+static inline void osmo_store32be_ext(uint32_t x, void *p, uint8_t n)
+{
+	uint8_t i;
+	uint8_t *q = (uint8_t *)p;
+	for(i = 0; i < n; q[i] = (x >> ((n - 1 - i) * 8)) & 0xFF, i++);
+}
+
+
+/* Convenience function for most-used cases */
+
+
+/*! \brief load unaligned 32-bit integer (little-endian encoding) */
+static inline uint32_t osmo_load32le(const void *p)
+{
+	return osmo_load32le_ext(p, 32 / 8);
+}
+
+/*! \brief load unaligned 32-bit integer (big-endian encoding) */
+static inline uint32_t osmo_load32be(const void *p)
+{
+	return osmo_load32be_ext(p, 32 / 8);
+}
+
+
+/*! \brief store unaligned 32-bit integer (little-endian encoding) */
+static inline void osmo_store32le(uint32_t x, void *p)
+{
+	osmo_store32le_ext(x, p, 32 / 8);
+}
+
+/*! \brief store unaligned 32-bit integer (big-endian encoding) */
+static inline void osmo_store32be(uint32_t x, void *p)
+{
+	osmo_store32be_ext(x, p, 32 / 8);
+}