From e27feadae0885aa074df58ebfda2e7a7f7a7d590 Mon Sep 17 00:00:00 2001
From: dim <dim@FreeBSD.org>
Date: Mon, 24 Nov 2014 09:08:18 +0000
Subject: Vendor import of llvm RELEASE_350/final tag r216957 (effectively,
 3.5.0 release):
 https://llvm.org/svn/llvm-project/llvm/tags/RELEASE_350/final@216957

---
 lib/Support/Compression.cpp | 36 ++++++++++++------------------------
 1 file changed, 12 insertions(+), 24 deletions(-)

(limited to 'lib/Support/Compression.cpp')

diff --git a/lib/Support/Compression.cpp b/lib/Support/Compression.cpp
index b5ddb70..c32eb21 100644
--- a/lib/Support/Compression.cpp
+++ b/lib/Support/Compression.cpp
@@ -12,12 +12,10 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/Compression.h"
-#include "llvm/ADT/OwningPtr.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Config/config.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/MemoryBuffer.h"
 #if LLVM_ENABLE_ZLIB == 1 && HAVE_ZLIB_H
 #include <zlib.h>
 #endif
@@ -48,36 +46,26 @@ static zlib::Status encodeZlibReturnValue(int ReturnValue) {
 
 bool zlib::isAvailable() { return true; }
 zlib::Status zlib::compress(StringRef InputBuffer,
-                            OwningPtr<MemoryBuffer> &CompressedBuffer,
+                            SmallVectorImpl<char> &CompressedBuffer,
                             CompressionLevel Level) {
   unsigned long CompressedSize = ::compressBound(InputBuffer.size());
-  OwningArrayPtr<char> TmpBuffer(new char[CompressedSize]);
+  CompressedBuffer.resize(CompressedSize);
   int CLevel = encodeZlibCompressionLevel(Level);
   Status Res = encodeZlibReturnValue(::compress2(
-      (Bytef *)TmpBuffer.get(), &CompressedSize,
+      (Bytef *)CompressedBuffer.data(), &CompressedSize,
       (const Bytef *)InputBuffer.data(), InputBuffer.size(), CLevel));
-  if (Res == StatusOK) {
-    CompressedBuffer.reset(MemoryBuffer::getMemBufferCopy(
-        StringRef(TmpBuffer.get(), CompressedSize)));
-    // Tell MSan that memory initialized by zlib is valid.
-    __msan_unpoison(CompressedBuffer->getBufferStart(), CompressedSize);
-  }
+  CompressedBuffer.resize(CompressedSize);
   return Res;
 }
 
 zlib::Status zlib::uncompress(StringRef InputBuffer,
-                              OwningPtr<MemoryBuffer> &UncompressedBuffer,
+                              SmallVectorImpl<char> &UncompressedBuffer,
                               size_t UncompressedSize) {
-  OwningArrayPtr<char> TmpBuffer(new char[UncompressedSize]);
-  Status Res = encodeZlibReturnValue(
-      ::uncompress((Bytef *)TmpBuffer.get(), (uLongf *)&UncompressedSize,
-                   (const Bytef *)InputBuffer.data(), InputBuffer.size()));
-  if (Res == StatusOK) {
-    UncompressedBuffer.reset(MemoryBuffer::getMemBufferCopy(
-        StringRef(TmpBuffer.get(), UncompressedSize)));
-    // Tell MSan that memory initialized by zlib is valid.
-    __msan_unpoison(UncompressedBuffer->getBufferStart(), UncompressedSize);
-  }
+  UncompressedBuffer.resize(UncompressedSize);
+  Status Res = encodeZlibReturnValue(::uncompress(
+      (Bytef *)UncompressedBuffer.data(), (uLongf *)&UncompressedSize,
+      (const Bytef *)InputBuffer.data(), InputBuffer.size()));
+  UncompressedBuffer.resize(UncompressedSize);
   return Res;
 }
 
@@ -88,12 +76,12 @@ uint32_t zlib::crc32(StringRef Buffer) {
 #else
 bool zlib::isAvailable() { return false; }
 zlib::Status zlib::compress(StringRef InputBuffer,
-                            OwningPtr<MemoryBuffer> &CompressedBuffer,
+                            SmallVectorImpl<char> &CompressedBuffer,
                             CompressionLevel Level) {
   return zlib::StatusUnsupported;
 }
 zlib::Status zlib::uncompress(StringRef InputBuffer,
-                              OwningPtr<MemoryBuffer> &UncompressedBuffer,
+                              SmallVectorImpl<char> &UncompressedBuffer,
                               size_t UncompressedSize) {
   return zlib::StatusUnsupported;
 }
-- 
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