add misc/read_write_int.h

misc/read_write_int.h

@@ -0,0 +1,181 @@
+/**
+ * @file read_write_int.h
+ * @author Ambroz Bizjak <ambrop7@gmail.com>
+ * 
+ * @section LICENSE
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the author nor the
+ *    names of its contributors may be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef BADVPN_READ_WRITE_INT_H
+#define BADVPN_READ_WRITE_INT_H
+
+#include <stdint.h>
+
+static uint8_t badvpn_read_le8 (const char *c_ptr);
+static uint16_t badvpn_read_le16 (const char *c_ptr);
+static uint32_t badvpn_read_le32 (const char *c_ptr);
+static uint64_t badvpn_read_le64 (const char *c_ptr);
+
+static uint8_t badvpn_read_be8 (const char *c_ptr);
+static uint16_t badvpn_read_be16 (const char *c_ptr);
+static uint32_t badvpn_read_be32 (const char *c_ptr);
+static uint64_t badvpn_read_be64 (const char *c_ptr);
+
+static void badvpn_write_le8 (uint8_t x, char *c_ptr);
+static void badvpn_write_le16 (uint16_t x, char *c_ptr);
+static void badvpn_write_le32 (uint32_t x, char *c_ptr);
+static void badvpn_write_le64 (uint64_t x, char *c_ptr);
+
+static void badvpn_write_be8 (uint8_t x, char *c_ptr);
+static void badvpn_write_be16 (uint16_t x, char *c_ptr);
+static void badvpn_write_be32 (uint32_t x, char *c_ptr);
+static void badvpn_write_be64 (uint64_t x, char *c_ptr);
+
+static uint8_t badvpn_read_le8 (const char *c_ptr)
+{
+    const uint8_t *ptr = (void *)c_ptr;
+    return ((uint8_t)ptr[0] << 0);
+}
+
+static uint16_t badvpn_read_le16 (const char *c_ptr)
+{
+    const uint8_t *ptr = (void *)c_ptr;
+    return ((uint16_t)ptr[1] << 8) | ((uint16_t)ptr[0] << 0);
+}
+
+static uint32_t badvpn_read_le32 (const char *c_ptr)
+{
+    const uint8_t *ptr = (void *)c_ptr;
+    return ((uint32_t)ptr[3] << 24) | ((uint32_t)ptr[2] << 16) |
+           ((uint32_t)ptr[1] <<  8) | ((uint32_t)ptr[0] <<  0);
+}
+
+static uint64_t badvpn_read_le64 (const char *c_ptr)
+{
+    const uint8_t *ptr = (void *)c_ptr;
+    return ((uint64_t)ptr[7] << 56) | ((uint64_t)ptr[6] << 48) |
+           ((uint64_t)ptr[5] << 40) | ((uint64_t)ptr[4] << 32) |
+           ((uint64_t)ptr[3] << 24) | ((uint64_t)ptr[2] << 16) |
+           ((uint64_t)ptr[1] <<  8) | ((uint64_t)ptr[0] <<  0);
+}
+
+static uint8_t badvpn_read_be8 (const char *c_ptr)
+{
+    const uint8_t *ptr = (void *)c_ptr;
+    return ((uint8_t)ptr[0] << 0);
+}
+
+static uint16_t badvpn_read_be16 (const char *c_ptr)
+{
+    const uint8_t *ptr = (void *)c_ptr;
+    return ((uint16_t)ptr[0] << 8) | ((uint16_t)ptr[1] << 0);
+}
+
+static uint32_t badvpn_read_be32 (const char *c_ptr)
+{
+    const uint8_t *ptr = (void *)c_ptr;
+    return ((uint32_t)ptr[0] << 24) | ((uint32_t)ptr[1] << 16) |
+           ((uint32_t)ptr[2] <<  8) | ((uint32_t)ptr[3] <<  0);
+}
+
+static uint64_t badvpn_read_be64 (const char *c_ptr)
+{
+    const uint8_t *ptr = (void *)c_ptr;
+    return ((uint64_t)ptr[0] << 56) | ((uint64_t)ptr[1] << 48) |
+           ((uint64_t)ptr[2] << 40) | ((uint64_t)ptr[3] << 32) |
+           ((uint64_t)ptr[4] << 24) | ((uint64_t)ptr[5] << 16) |
+           ((uint64_t)ptr[6] <<  8) | ((uint64_t)ptr[7] <<  0);
+}
+
+static void badvpn_write_le8 (uint8_t x, char *c_ptr)
+{
+    uint8_t *ptr = (void *)c_ptr;
+    ptr[0] = x >> 0;
+}
+
+static void badvpn_write_le16 (uint16_t x, char *c_ptr)
+{
+    uint8_t *ptr = (void *)c_ptr;
+    ptr[1] = x >> 8;
+    ptr[0] = x >> 0;
+}
+
+static void badvpn_write_le32 (uint32_t x, char *c_ptr)
+{
+    uint8_t *ptr = (void *)c_ptr;
+    ptr[3] = x >> 24;
+    ptr[2] = x >> 16;
+    ptr[1] = x >> 8;
+    ptr[0] = x >> 0;
+}
+
+static void badvpn_write_le64 (uint64_t x, char *c_ptr)
+{
+    uint8_t *ptr = (void *)c_ptr;
+    ptr[7] = x >> 56;
+    ptr[6] = x >> 48;
+    ptr[5] = x >> 40;
+    ptr[4] = x >> 32;
+    ptr[3] = x >> 24;
+    ptr[2] = x >> 16;
+    ptr[1] = x >> 8;
+    ptr[0] = x >> 0;
+}
+
+static void badvpn_write_be8 (uint8_t x, char *c_ptr)
+{
+    uint8_t *ptr = (void *)c_ptr;
+    ptr[0] = x >> 0;
+}
+
+static void badvpn_write_be16 (uint16_t x, char *c_ptr)
+{
+    uint8_t *ptr = (void *)c_ptr;
+    ptr[0] = x >> 8;
+    ptr[1] = x >> 0;
+}
+
+static void badvpn_write_be32 (uint32_t x, char *c_ptr)
+{
+    uint8_t *ptr = (void *)c_ptr;
+    ptr[0] = x >> 24;
+    ptr[1] = x >> 16;
+    ptr[2] = x >> 8;
+    ptr[3] = x >> 0;
+}
+
+static void badvpn_write_be64 (uint64_t x, char *c_ptr)
+{
+    uint8_t *ptr = (void *)c_ptr;
+    ptr[0] = x >> 56;
+    ptr[1] = x >> 48;
+    ptr[2] = x >> 40;
+    ptr[3] = x >> 32;
+    ptr[4] = x >> 24;
+    ptr[5] = x >> 16;
+    ptr[6] = x >> 8;
+    ptr[7] = x >> 0;
+}
+
+#endif