feat: update structure

cs2106/labs/lab4/bitmap/bitmap.h

@@ -0,0 +1,40 @@
+/* Bitmap management
+
+   The bitmap should be an array of unsigned char.
+
+ */
+
+// Used by test harness
+long get_index(void *ptr);
+
+// Utility function to print out an array of char as bits
+// Print the entire bitmap. Arguments: The bitmap itself, and the length of the
+// bitmap Each bit of the bitmap represents 1 byte of memory. 0 = free, 1 =
+// allocated. map: The bitmap itself, an array of unsigned char.
+//      Each bit of the bitmap represents one byte of memory
+// len: The length of the bitmap array in characters
+//
+// Returns: Nothing
+void print_map(unsigned char *map, int len);
+
+// Search the bitmap for the required number of zeroes (representing
+// free bytes of memory). Returns index of first stretch of 0s
+// that meet the criteria. You can use this as an index into
+// an array of char that represents the process heap
+// bitmap = Bitmap declared as an array of unsigned char
+// len = Length of bitmap in characters
+// num_zeroes = Length of string of 0's required
+// Returns: Index to stretch of 0's of required length
+long search_map(unsigned char *bitmap, int len, long num_zeroes);
+
+// Marks a stretch of bits as "1", representing allocated memory
+// map = Bitmap declared as array of unsigned char
+// start = Starting index to mark
+// length = Number of bits to mark as "1"
+void allocate_map(unsigned char *map, long start, long length);
+
+// Marks a stretch of bits as "0", representing allocated memory
+// map = Bitmap declared as array of unsigned char
+// start = Starting index to mark
+// length = Number of bits to mark as "0"
+void free_map(unsigned char *, long, long);