From 2033101b3e9ca9fdc4efa8a658404594df67131f Mon Sep 17 00:00:00 2001
From: Eric Wong <normalperson@yhbt.net>
Date: Sun, 2 Aug 2009 18:49:55 -0700
Subject: http: process Content-Length and Transfer-Encoding

Explicitly track if our request will need Content-Length
or chunked body decoding.
---
 ext/unicorn_http/c_util.h | 56 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

(limited to 'ext/unicorn_http/c_util.h')

diff --git a/ext/unicorn_http/c_util.h b/ext/unicorn_http/c_util.h
index 78ad168..895c686 100644
--- a/ext/unicorn_http/c_util.h
+++ b/ext/unicorn_http/c_util.h
@@ -6,6 +6,9 @@
 #ifndef UH_util_h
 #define UH_util_h
 
+#include <unistd.h>
+#include <assert.h>
+
 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
 
 #ifndef SIZEOF_OFF_T
@@ -40,4 +43,57 @@ static void downcase_char(char *c)
     *c |= 0x20;
 }
 
+static int hexchar2int(int xdigit)
+{
+  if (xdigit >= 'A' && xdigit <= 'F')
+    return xdigit - 'A' + 10;
+  if (xdigit >= 'a' && xdigit <= 'f')
+    return xdigit - 'a' + 10;
+
+  /* Ragel already does runtime range checking for us in Unicorn: */
+  assert(xdigit >= '0' && xdigit <= '9');
+
+  return xdigit - '0';
+}
+
+/*
+ * multiplies +i+ by +base+ and increments the result by the parsed
+ * integer value of +xdigit+.  +xdigit+ is a character byte
+ * representing a number the range of 0..(base-1)
+ * returns the new value of +i+ on success
+ * returns -1 on errors (including overflow)
+ */
+static off_t step_incr(off_t i, int xdigit, const int base)
+{
+  static const off_t max = UH_OFF_T_MAX;
+  const off_t next_max = (max - (max % base)) / base;
+  off_t offset = hexchar2int(xdigit);
+
+  if (offset > (base - 1))
+    return -1;
+  if (i > next_max)
+    return -1;
+  i *= base;
+
+  if ((offset > (base - 1)) || ((max - i) < offset))
+    return -1;
+
+  return i + offset;
+}
+
+/*
+ * parses a non-negative length according to base-10 and
+ * returns it as an off_t value.  Returns -1 on errors
+ * (including overflow).
+ */
+static off_t parse_length(const char *value, size_t length)
+{
+  off_t rv;
+
+  for (rv = 0; length-- && rv >= 0; ++value)
+    rv = step_incr(rv, *value, 10);
+
+  return rv;
+}
+
 #endif /* UH_util_h */
-- 
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