[generator] A fix for applying corrupted diffs.

It looks like sometimes diff files cannot be unarchived.
The result of inflate() should at least contain the diff
header even for diffs created from two identical files but
for some reason it appears to be empty.
This commit stops assuming that the downloaded diff
file can be read without errors.

2 files changed, 14 insertions, 1 deletions

diff --git a/coding/reader.cpp b/coding/reader.cpp
index 6b94af3bc7..b7f4a1c59d 100644
--- a/coding/reader.cpp
+++ b/coding/reader.cpp
@@ -2,7 +2,6 @@
 
 #include "base/string_utils.hpp"
 
-
 void Reader::ReadAsString(string & s) const
 {
   s.clear();
@@ -11,6 +10,14 @@ void Reader::ReadAsString(string & s) const
   Read(0, &s[0], sz);
 }
 
+vector<uint8_t> Reader::Contents() const
+{
+  vector<uint8_t> contents;
+  contents.resize(Size());
+  Read(0 /* pos */, contents.data(), contents.size());
+  return contents;
+}
+
 bool Reader::IsEqual(string const & name1, string const & name2)
 {
 #if defined(OMIM_OS_WINDOWS)
diff --git a/coding/reader.hpp b/coding/reader.hpp
index fb3546a717..5ff276ccc1 100644
--- a/coding/reader.hpp
+++ b/coding/reader.hpp
@@ -1,9 +1,11 @@
 #pragma once
+
 #include "coding/endianness.hpp"
 
 #include "base/assert.hpp"
 #include "base/exception.hpp"
 
+#include "std/cstdint.hpp"
 #include "std/cstring.hpp"
 #include "std/shared_array.hpp"
 #include "std/shared_ptr.hpp"
@@ -28,6 +30,10 @@ public:
 
   void ReadAsString(string & s) const;
 
+  // Reads the contents of this Reader to a vector of 8-bit bytes.
+  // Similar to ReadAsString but makes no assumptions about the char type.
+  vector<uint8_t> Contents() const;
+
   static bool IsEqual(string const & name1, string const & name2);
 };