endianess conversion

Author: theEmbeddedGeorge

Data_Struct_Implementation/endianessSwap/Makefile

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+CC=gcc
+CFLGAS=-Wall
+DEPS = 
+OBJ = endianess
+
+%.o: %.c $(DEPS)
+	$(CC) -c -o $@ $< $(CFLAGS)
+
+$(OBJ): $(OBJ).o
+	$(CC) -o $@ $^ $(CFLAGS)
+
+clean:
+	rm -f $(OBJ) $(OBJ).o

Data_Struct_Implementation/endianessSwap/README.md

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+## Endianess Conversion
+#### Usage
+```
+make
+./endianess
+```
+
+### Code
+```c
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+uint32_t endianess_swap(uint32_t num) {
+    num = ((num & 0xffff0000) >> 16) | ((num & 0x0000ffff) << 16);
+    num = ((num & 0xff00ff00) >> 8) | ((num & 0x00ff00ff) << 8);
+    return num;
+}
+
+int main (int argc, char *argv[]) {
+
+	uint32_t num = 0x12345678;
+    uint8_t *n = (uint8_t*) &num;
+    int i;
+
+    for (i = 0; i < sizeof(num); i++) {
+        printf("%x ", *n++);
+    }
+    printf("\n");
+
+    uint32_t swap_num = endianess_swap(num);
+    n = (uint8_t*) &swap_num;
+
+    for (i = 0; i < sizeof(swap_num); i++) {
+        printf("%x ", *n++);
+    }
+    printf("\n");
+
+	return 0;
+}
+
+```
+
+## Reference
+
+https://www.geeksforgeeks.org/little-and-big-endian-mystery/
+
+

Data_Struct_Implementation/endianessSwap/endianess.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+uint32_t endianess_swap(uint32_t num) {
+    num = ((num & 0xffff0000) >> 16) | ((num & 0x0000ffff) << 16);
+    num = ((num & 0xff00ff00) >> 8) | ((num & 0x00ff00ff) << 8);
+    return num;
+}
+
+int main (int argc, char *argv[]) {
+
+	uint32_t num = 0x12345678;
+    uint8_t *n = (uint8_t*) &num;
+    int i;
+
+    for (i = 0; i < sizeof(num); i++) {
+        printf("%x ", *n++);
+    }
+    printf("\n");
+
+    uint32_t swap_num = endianess_swap(num);
+    n = (uint8_t*) &swap_num;
+
+    for (i = 0; i < sizeof(swap_num); i++) {
+        printf("%x ", *n++);
+    }
+    printf("\n");
+
+	return 0;
+}