From 397984d23d0dd1c89c0a744ba70543c137c69eb6 Mon Sep 17 00:00:00 2001
From: Alex 'AdUser' Z <ad_user@runbox.com>
Date: Tue, 7 Apr 2015 18:12:06 +1000
Subject: [PATCH] + bitmap_unpack()

---
 src/bitmap.c | 22 ++++++++++++++++++++++
 src/bitmap.h |  4 ++++
 2 files changed, 26 insertions(+)

diff --git a/src/bitmap.c b/src/bitmap.c
index 3e62db9..46d339a 100644
--- a/src/bitmap.c
+++ b/src/bitmap.c
@@ -67,3 +67,25 @@ bitmap_diffmap(unsigned char *diff,
 
   return i;
 }
+
+size_t
+bitmap_unpack(const unsigned char *map,
+              unsigned char ** const buf) {
+  size_t buf_size = BITMAP_BITS;
+  uint16_t *p, row, mask;
+  unsigned char *q = NULL;
+
+  CALLOC(*buf, buf_size, sizeof(char));
+
+  p = (uint16_t *) map;
+  q = *buf;
+  for (size_t i = 0; i < BITMAP_SIDE; i++, p++) {
+    row = *p; mask = 0x1;
+    for (size_t j = 0; j < 16; j++, q++) {
+      *q = (row & mask) ? 0xFF : 0x00;
+      mask <<= 1;
+    }
+  }
+
+  return buf_size;
+}
diff --git a/src/bitmap.h b/src/bitmap.h
index dbe65bf..b5a3457 100644
--- a/src/bitmap.h
+++ b/src/bitmap.h
@@ -15,4 +15,8 @@ int
 bitmap_diffmap(unsigned char *diff,
                const unsigned char *a,
                const unsigned char *b);
+
+size_t
+bitmap_unpack(const unsigned char *map,
+              unsigned char ** const buf);
 #endif