Added UHF RFID app

applications/external/uhf_rfid/uhf_buffer.c

@@ -0,0 +1,69 @@
+#include "uhf_buffer.h"
+#include <stdlib.h>
+#include <string.h>
+
+Buffer* buffer_alloc(size_t initial_capacity) {
+    Buffer* buf = (Buffer*)malloc(sizeof(Buffer));
+    buf->data = (uint8_t*)malloc(sizeof(uint8_t) * initial_capacity);
+    if(!buf->data) {
+        free(buf);
+        return NULL;
+    }
+    buf->size = 0;
+    buf->capacity = initial_capacity;
+    return buf;
+}
+
+bool buffer_append_single(Buffer* buf, uint8_t data) {
+    if(buf->closed) return false;
+    if(buf->size + 1 > buf->capacity) {
+        size_t new_capacity = buf->capacity * 2;
+        uint8_t* new_data = (uint8_t*)realloc(buf->data, sizeof(uint8_t) * new_capacity);
+        if(!new_data) return false;
+        buf->data = new_data;
+        buf->capacity = new_capacity;
+    }
+    buf->data[buf->size++] = data;
+    return true;
+}
+
+bool buffer_append(Buffer* buf, uint8_t* data, size_t data_size) {
+    if(buf->closed) return false;
+    if(buf->size + data_size > buf->capacity) {
+        size_t new_capacity = buf->capacity * 2;
+        uint8_t* new_data = (uint8_t*)realloc(buf->data, new_capacity);
+        if(!new_data) return false;
+
+        buf->data = new_data;
+        buf->capacity = new_capacity;
+    }
+
+    memcpy((void*)&buf->data[buf->size], data, data_size);
+    buf->size += data_size;
+    return true;
+}
+
+uint8_t* buffer_get_data(Buffer* buf) {
+    return buf->data;
+}
+
+size_t buffer_get_size(Buffer* buf) {
+    return buf->size;
+}
+
+void buffer_close(Buffer* buf) {
+    buf->closed = true;
+}
+
+void buffer_reset(Buffer* buf) {
+    for(size_t i = 0; i < MAX_BUFFER_SIZE; i++) {
+        buf->data[i] = 0;
+    }
+    buf->size = 0;
+    buf->closed = false;
+}
+
+void buffer_free(Buffer* buf) {
+    free(buf->data);
+    free(buf);
+}