From ee03c949b85036b68c261dcc27dca064ee7e525d Mon Sep 17 00:00:00 2001
From: Alexey Samsonov <samsonov@google.com>
Date: Tue, 23 Apr 2013 08:28:39 +0000
Subject: Add basic zlib support to LLVM. This would allow to use
 compression/uncompression in selected LLVM tools.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180083 91177308-0d34-0410-b5e6-96231b3b80d8
---
 unittests/Support/CompressionTest.cpp | 68 +++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 unittests/Support/CompressionTest.cpp

(limited to 'unittests/Support/CompressionTest.cpp')

diff --git a/unittests/Support/CompressionTest.cpp b/unittests/Support/CompressionTest.cpp
new file mode 100644
index 0000000000..aad7ed0e89
--- /dev/null
+++ b/unittests/Support/CompressionTest.cpp
@@ -0,0 +1,68 @@
+//===- llvm/unittest/Support/CompressionTest.cpp - Compression tests ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements unit tests for the Compression functions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Compression.h"
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Config/config.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+namespace {
+
+#if LLVM_ENABLE_ZLIB == 1
+
+void TestZlibCompression(StringRef Input, zlib::CompressionLevel Level) {
+  OwningPtr<MemoryBuffer> Compressed;
+  OwningPtr<MemoryBuffer> Uncompressed;
+  EXPECT_EQ(zlib::StatusOK, zlib::compress(Input, Compressed, Level));
+  // Check that uncompressed buffer is the same as original.
+  EXPECT_EQ(zlib::StatusOK, zlib::uncompress(Compressed->getBuffer(),
+                                             Uncompressed, Input.size()));
+  EXPECT_EQ(Input.size(), Uncompressed->getBufferSize());
+  EXPECT_EQ(0,
+            memcmp(Input.data(), Uncompressed->getBufferStart(), Input.size()));
+  if (Input.size() > 0) {
+    // Uncompression fails if expected length is too short.
+    EXPECT_EQ(zlib::StatusBufferTooShort,
+              zlib::uncompress(Compressed->getBuffer(), Uncompressed,
+                               Input.size() - 1));
+  }
+}
+
+TEST(CompressionTest, Zlib) {
+  TestZlibCompression("", zlib::DefaultCompression);
+
+  TestZlibCompression("hello, world!", zlib::NoCompression);
+  TestZlibCompression("hello, world!", zlib::BestSizeCompression);
+  TestZlibCompression("hello, world!", zlib::BestSpeedCompression);
+  TestZlibCompression("hello, world!", zlib::DefaultCompression);
+
+  const size_t kSize = 1024;
+  char BinaryData[kSize];
+  for (size_t i = 0; i < kSize; ++i) {
+    BinaryData[i] = i & 255;
+  }
+  StringRef BinaryDataStr(BinaryData, kSize);
+
+  TestZlibCompression(BinaryDataStr, zlib::NoCompression);
+  TestZlibCompression(BinaryDataStr, zlib::BestSizeCompression);
+  TestZlibCompression(BinaryDataStr, zlib::BestSpeedCompression);
+  TestZlibCompression(BinaryDataStr, zlib::DefaultCompression);
+}
+
+#endif
+
+}
-- 
cgit v1.2.3-70-g09d2


From a0bd5df0867e054b9740bc734325cdeabfe3825a Mon Sep 17 00:00:00 2001
From: Alexey Samsonov <samsonov@google.com>
Date: Tue, 23 Apr 2013 08:57:30 +0000
Subject: Add more guards around zlib-dependent code

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180084 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Config/config.h.cmake    | 3 +++
 lib/Support/Compression.cpp           | 2 +-
 unittests/Support/CompressionTest.cpp | 2 +-
 3 files changed, 5 insertions(+), 2 deletions(-)

(limited to 'unittests/Support/CompressionTest.cpp')

diff --git a/include/llvm/Config/config.h.cmake b/include/llvm/Config/config.h.cmake
index 408c590beb..97af6955d9 100644
--- a/include/llvm/Config/config.h.cmake
+++ b/include/llvm/Config/config.h.cmake
@@ -230,6 +230,9 @@
 /* Define to 1 if you have the `udis86' library (-ludis86). */
 #undef HAVE_LIBUDIS86
 
+/* Define to 1 if you have the 'z' library (-lz). */
+#cmakedefine HAVE_LIBZ ${HAVE_LIBZ}
+
 /* Define to 1 if you have the <limits.h> header file. */
 #cmakedefine HAVE_LIMITS_H ${HAVE_LIMITS_H}
 
diff --git a/lib/Support/Compression.cpp b/lib/Support/Compression.cpp
index d0adf79ec7..497b17ec92 100644
--- a/lib/Support/Compression.cpp
+++ b/lib/Support/Compression.cpp
@@ -23,7 +23,7 @@
 
 using namespace llvm;
 
-#if LLVM_ENABLE_ZLIB == 1
+#if LLVM_ENABLE_ZLIB == 1 && HAVE_LIBZ
 static int encodeZlibCompressionLevel(zlib::CompressionLevel Level) {
   switch (Level) {
     case zlib::NoCompression: return 0;
diff --git a/unittests/Support/CompressionTest.cpp b/unittests/Support/CompressionTest.cpp
index aad7ed0e89..c8e2cd9f02 100644
--- a/unittests/Support/CompressionTest.cpp
+++ b/unittests/Support/CompressionTest.cpp
@@ -22,7 +22,7 @@ using namespace llvm;
 
 namespace {
 
-#if LLVM_ENABLE_ZLIB == 1
+#if LLVM_ENABLE_ZLIB == 1 && HAVE_LIBZ
 
 void TestZlibCompression(StringRef Input, zlib::CompressionLevel Level) {
   OwningPtr<MemoryBuffer> Compressed;
-- 
cgit v1.2.3-70-g09d2