Buf serializing code

buf/buf.c

@@ -0,0 +1,107 @@
+#include <stdint.h>
+#include <string.h>
+
+/**
+ * @brief Write a 8 bit unsigned int to the buffer
+ *
+ * @param buf The buffer to write to
+ * @param value The 8 bit unsigned int to write
+ * @param index The index read/write pointer
+ */
+void buf_append_u8(uint8_t *buf, uint8_t value, size_t *index) {
+    buf[(*index)++] = value;
+}
+
+/**
+ * @brief Write a 16 bit signed int to the buffer
+ *
+ * @param buf The buffer to write to
+ * @param value The 16 bit signed int to write
+ * @param index The index read/write pointer
+ */
+void buf_append_i16(uint8_t *buf, int16_t value, size_t *index) {
+    buf[(*index)++] = (value >> 8) & 0xFF;
+    buf[(*index)++] = value & 0xFF;
+}
+
+/**
+ * @brief Write a 32 bit signed int to the buffer
+ *
+ * @param buf The buffer to write to
+ * @param value The 32 bit signed int to write
+ * @param index The index read/write pointer
+ */
+void buf_append_i32(uint8_t *buf, int32_t value, size_t *index) {
+    buf[(*index)++] = (value >> 24) & 0xFF;
+    buf[(*index)++] = (value >> 16) & 0xFF;
+    buf[(*index)++] = (value >> 8) & 0xFF;
+    buf[(*index)++] = value & 0xFF;
+}
+
+/**
+ * @brief Write a 32 bit float to the buffer
+ *
+ * @param buf The buffer to write to
+ * @param value The 32 bit float to write
+ * @param index The index read/write pointer
+ */
+void buf_append_f32(uint8_t *buf, float value, size_t *index) {
+    uint32_t u;
+    memcpy(&u, &value, sizeof(float)); // Safe conversion
+    buf_append_i32(buf, (int32_t)u, index);
+}
+
+/**
+ * @brief Read a 8 bit unsigned int from the buffer
+ *
+ * @param buf The buffer to read from
+ * @param index The index read/write pointer
+ * @return 8 bit unsigned int
+ */
+uint8_t buf_read_u8(const uint8_t *buf, size_t *index) {
+    return buf[(*index)++];
+}
+
+/**
+ * @brief Read a 16 bit int from the buffer
+ *
+ * @param buf The buffer to read from
+ * @param index The index read/write pointer
+ * @return 16 bit signed int
+ */
+uint8_t buf_read_i16(const uint8_t *buf, size_t *index) {
+    int16_t val = 0;
+    val |= ((int16_t)buf[(*index)++]) << 8;
+    val |= ((int16_t)buf[(*index)++]);
+    return val;
+}
+
+/**
+ * @brief Read a 32 bit int from the buffer
+ *
+ * @param buf The buffer to read from
+ * @param index The index read/write pointer
+ * @return 32 bit signed int
+ */
+int32_t buf_read_i32(const uint8_t *buf, size_t *index) {
+    int32_t val = 0;
+    val |= ((int32_t)buf[(*index)++]) << 24;
+    val |= ((int32_t)buf[(*index)++]) << 16;
+    val |= ((int32_t)buf[(*index)++]) << 8;
+    val |= ((int32_t)buf[(*index)++]);
+    return val;
+}
+
+/**
+ * @brief Read a 32 bit float from the buffer
+ *
+ * @param buf The buffer to read from
+ * @param index The index read/write pointer
+ * @return 32 bit float
+ */
+float buf_read_f32(const uint8_t *buf, size_t *index) {
+    uint32_t u = (uint32_t)buf_read_i32(buf, index);
+    float    f;
+    memcpy(&f, &u, sizeof(float));
+    return f;
+}