From 8f4b7ac15c77f24952364f1b3b1ac42e2e52ebd5 Mon Sep 17 00:00:00 2001
From: take_cheeze <takechi101010@gmail.com>
Date: Sat, 14 Jun 2014 13:16:13 +0900
Subject: Support float/double unpacking.

---
 src/pack.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 65 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/pack.c b/src/pack.c
index 6b211c961..69cf740ff 100644
--- a/src/pack.c
+++ b/src/pack.c
@@ -255,6 +255,35 @@ pack_double(mrb_state *mrb, mrb_value o, mrb_value str, mrb_int sidx, unsigned i
   return 8;
 }
 
+static int
+unpack_double(mrb_state *mrb, const unsigned char * src, int srclen, mrb_value ary, unsigned int flags)
+{
+  int i;
+  double d;
+  uint8_t *buffer = (uint8_t *)&d;
+
+  if (flags & PACK_FLAG_LITTLEENDIAN) {
+#ifdef MRB_ENDIAN_BIG
+    for (i = 0; i < 8; ++i) {
+      buffer[8 - i - 1] = src[i];
+    }
+#else
+    memcpy(buffer, src, 8);
+#endif
+  } else {
+#ifdef MRB_ENDIAN_BIG
+    memcpy(buffer, src, 8);
+#else
+    for (i = 0; i < 8; ++i) {
+      buffer[8 - i - 1] = src[i];
+    }
+#endif
+  }
+  mrb_ary_push(mrb, ary, mrb_float_value(mrb, d));
+
+  return 8;
+}
+
 static int
 pack_float(mrb_state *mrb, mrb_value o, mrb_value str, mrb_int sidx, unsigned int flags)
 {
@@ -285,6 +314,35 @@ pack_float(mrb_state *mrb, mrb_value o, mrb_value str, mrb_int sidx, unsigned in
   return 4;
 }
 
+static int
+unpack_float(mrb_state *mrb, const unsigned char * src, int srclen, mrb_value ary, unsigned int flags)
+{
+  int i;
+  float f;
+  uint8_t *buffer = (uint8_t *)&f;
+
+  if (flags & PACK_FLAG_LITTLEENDIAN) {
+#ifdef MRB_ENDIAN_BIG
+    for (i = 0; i < 4; ++i) {
+      buffer[4 - i - 1] = src[i];
+    }
+#else
+    memcpy(buffer, src, 4);
+#endif
+  } else {
+#ifdef MRB_ENDIAN_BIG
+    memcpy(buffer, src, 4);
+#else
+    for (i = 0; i < 4; ++i) {
+      buffer[4 - i - 1] = src[i];
+    }
+#endif
+  }
+  mrb_ary_push(mrb, ary, mrb_float_value(mrb, f));
+
+  return 4;
+}
+
 static int
 pack_a(mrb_state *mrb, mrb_value src, mrb_value dst, mrb_int didx, long count, unsigned int flags)
 {
@@ -623,7 +681,7 @@ read_tmpl(mrb_state *mrb, struct tmpl *tmpl, int *dirp, int *typep, int *sizep,
   case 'F': case 'f':
     dir = PACK_DIR_FLOAT;
     type = PACK_TYPE_FLOAT;
-    size = 8;
+    size = 4;
     flags |= PACK_FLAG_SIGNED;
     break;
   case 'E':
@@ -899,6 +957,12 @@ mrb_pack_unpack(mrb_state *mrb, mrb_value str)
       case PACK_DIR_BASE64:
         srcidx += unpack_m(mrb, sptr, srclen - srcidx, result, flags);
         break;
+      case PACK_DIR_FLOAT:
+        srcidx += unpack_float(mrb, sptr, srclen - srcidx, result, flags);
+        break;
+      case PACK_DIR_DOUBLE:
+        srcidx += unpack_double(mrb, sptr, srclen - srcidx, result, flags);
+        break;
       }
       if (count > 0) {
         count--;
-- 
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