Updated README.

[plomrogue] / src / readwrite.c

diff --git a/src/readwrite.c b/src/readwrite.c
index ed5a3a3180f990ec8af3c001a44c85c557a3f80e..761497021e1af9cce25cdd441f19cb1f9898e366 100644 (file)
--- a/src/readwrite.c
+++ b/src/readwrite.c
@@ -1,40 +1,38 @@
+#include "readwrite.h"
 #include <stdio.h>
-#include <limits.h>
 #include <stdint.h>
+#include <limits.h>
+
+static const uint16_t uchar_s = UCHAR_MAX + 1;
 
-uint16_t read_uint16_bigendian(FILE * file) {
+extern uint16_t read_uint16_bigendian(FILE * file) {
 // Read uint16 from file in big-endian order.
-  const uint16_t nchar = UCHAR_MAX + 1;
   unsigned char a = fgetc(file);
   unsigned char b = fgetc(file);
-  return (a * nchar) + b; }
-
-void write_uint16_bigendian(uint16_t x, FILE * file) {
-// Write uint16 to file in beg-endian order.
-  const uint16_t nchar = UCHAR_MAX + 1;
-  unsigned char a = x / nchar;
-  unsigned char b = x % nchar;
-  fputc(a, file);
-  fputc(b, file); }
+  return (a * uchar_s) + b; }
 
-uint32_t read_uint32_bigendian(FILE * file) {
+extern uint32_t read_uint32_bigendian(FILE * file) {
 // Read uint32 from file in big-endian order.
-  const uint16_t nchar = UCHAR_MAX + 1;
   unsigned char a = fgetc(file);
   unsigned char b = fgetc(file);
   unsigned char c = fgetc(file);
   unsigned char d = fgetc(file);
-  return (a * nchar * nchar * nchar) + (b * nchar * nchar) + (c * nchar) + d; }
+  return (a * uchar_s * uchar_s * uchar_s) + (b * uchar_s * uchar_s) + (c * uchar_s) + d; }
+
+extern void write_uint16_bigendian(uint16_t x, FILE * file) {
+// Write uint16 to file in beg-endian order.
+  unsigned char a = x / uchar_s;
+  unsigned char b = x % uchar_s;
+  fputc(a, file);
+  fputc(b, file); }
 
-void write_uint32_bigendian(uint32_t x, FILE * file) {
+extern void write_uint32_bigendian(uint32_t x, FILE * file) {
 // Write uint32 to file in beg-endian order.
-  const uint16_t nchar = UCHAR_MAX + 1;
-  unsigned char a = x / (nchar * nchar * nchar);
-  unsigned char b = (x - (a * nchar * nchar * nchar)) / (nchar * nchar);
-  unsigned char c = (x - ((a * nchar * nchar * nchar) + (b * nchar * nchar))) / nchar;
-  unsigned char d = x % nchar;
+  unsigned char a = x / (uchar_s * uchar_s * uchar_s);
+  unsigned char b = (x - (a * uchar_s * uchar_s * uchar_s)) / (uchar_s * uchar_s);
+  unsigned char c = (x - ((a * uchar_s * uchar_s * uchar_s) + (b * uchar_s * uchar_s))) / uchar_s;
+  unsigned char d = x % uchar_s;
   fputc(a, file);
   fputc(b, file);
   fputc(c, file);
   fputc(d, file); }
-