Added nioTSO's EA MicroTalk encoder to the project

library/tools/utkencode/io.h

@@ -0,0 +1,78 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+static void read_bytes(FILE *fp, uint8_t *dest, size_t size)
+{
+    size_t bytes_copied;
+
+    if (!size)
+        return;
+
+    bytes_copied = fread(dest, 1, size, fp);
+    if (bytes_copied < size) {
+        if (ferror(fp))
+            fprintf(stderr, "error: fread failed: %s\n", strerror(errno));
+        else
+            fprintf(stderr, "error: unexpected end of file\n");
+
+        exit(EXIT_FAILURE);
+    }
+}
+
+static uint32_t read_u32(FILE *fp)
+{
+    uint8_t dest[4];
+    read_bytes(fp, dest, sizeof(dest));
+    return dest[0] | (dest[1] << 8) | (dest[2] << 16) | (dest[3] << 24);
+}
+
+static uint16_t read_u16(FILE *fp)
+{
+    uint8_t dest[2];
+    read_bytes(fp, dest, sizeof(dest));
+    return dest[0] | (dest[1] << 8);
+}
+
+static uint16_t read_u8(FILE *fp)
+{
+    uint8_t dest;
+    read_bytes(fp, &dest, sizeof(dest));
+    return dest;
+}
+
+static void write_bytes(FILE *fp, const uint8_t *dest, size_t size)
+{
+    if (!size)
+        return;
+
+    if (fwrite(dest, 1, size, fp) != size) {
+        fprintf(stderr, "error: fwrite failed: %s\n", strerror(errno));
+        exit(EXIT_FAILURE);
+    }
+}
+
+static void write_u32(FILE *fp, uint32_t x)
+{
+    uint8_t dest[4];
+    dest[0] = (uint8_t)x;
+    dest[1] = (uint8_t)(x>>8);
+    dest[2] = (uint8_t)(x>>16);
+    dest[3] = (uint8_t)(x>>24);
+    write_bytes(fp, dest, sizeof(dest));
+}
+
+static void write_u16(FILE *fp, uint16_t x)
+{
+    uint8_t dest[2];
+    dest[0] = (uint8_t)x;
+    dest[1] = (uint8_t)(x>>8);
+    write_bytes(fp, dest, sizeof(dest));
+}
+
+static void write_u8(FILE *fp, uint8_t x)
+{
+    write_bytes(fp, &x, sizeof(x));
+}