From 28fd36f0df5411edc5c0177c5034a4dab66e7b1d Mon Sep 17 00:00:00 2001
From: Michael Vrable <mvrable@cs.ucsd.edu>
Date: Tue, 17 Jul 2007 16:29:14 -0700
Subject: [PATCH] Add string un-escaping, and fix the statcache reader to use
 it.

---
 format.cc    | 32 ++++++++++++++++++++++++++++++++
 format.h     |  1 +
 statcache.cc |  3 ++-
 3 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/format.cc b/format.cc
index 1fccf4e..9e985af 100644
--- a/format.cc
+++ b/format.cc
@@ -39,6 +39,38 @@ string uri_encode(const string &in)
     return out;
 }
 
+/* Decoding of strings produced by uri_encode. */
+string uri_decode(const string &in)
+{
+    char *buf = new char[in.size() + 1];
+
+    const char *input = in.c_str();
+    char *output = buf;
+
+    while (*input != '\0') {
+        if (*input == '%') {
+            char hexbuf[4];
+            if (isxdigit(input[1]) && isxdigit(input[2])) {
+                hexbuf[0] = input[1];
+                hexbuf[1] = input[2];
+                hexbuf[2] = '\0';
+                *output++ = strtol(hexbuf, NULL, 16);
+                input += 3;
+            } else {
+                input++;
+            }
+        } else {
+            *output++ = *input++;
+        }
+    }
+
+    *output = '\0';
+
+    string result(buf);
+    delete buf;
+    return result;
+}
+
 /* Return the string representation of an integer. */
 string encode_int(long long n)
 {
diff --git a/format.h b/format.h
index 519bceb..7cb9bf4 100644
--- a/format.h
+++ b/format.h
@@ -13,6 +13,7 @@
 #include <string>
 
 std::string uri_encode(const std::string &in);
+std::string uri_decode(const std::string &in);
 std::string encode_int(long long n);
 void dict_output(std::ostream &o, std::map<std::string, std::string> dict);
 
diff --git a/statcache.cc b/statcache.cc
index cccbf5b..5a8d26c 100644
--- a/statcache.cc
+++ b/statcache.cc
@@ -125,12 +125,13 @@ void StatCache::ReadNext()
     old_checksum = "";
     old_contents.clear();
 
-    /* First, read in the filename.  TODO: Unescaping. */
+    /* First, read in the filename. */
     getline(cache, old_name);
     if (!cache) {
         end_of_cache = true;
         return;
     }
+    old_name = uri_decode(old_name);
 
     /* Start reading in the fields which follow the filename. */
     string field = "";
-- 
2.20.1