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

3 files changed, 73 insertions, 0 deletions

diff --git a/include/llvm/Config/config.h.cmake b/include/llvm/Config/config.h.cmake
index 0a26857397..408c590beb 100644
--- a/include/llvm/Config/config.h.cmake
+++ b/include/llvm/Config/config.h.cmake
@@ -498,6 +498,9 @@
 /* Define if the xdot.py program is available */
 #cmakedefine HAVE_XDOT_PY ${HAVE_XDOT_PY}
 
+/* Define to 1 if you have the <zlib.h> header file. */
+#cmakedefine HAVE_ZLIB_H ${HAVE_ZLIB_H}
+
 /* Have host's _alloca */
 #cmakedefine HAVE__ALLOCA ${HAVE__ALLOCA}
 
@@ -570,6 +573,9 @@
 /* Define if threads enabled */
 #cmakedefine01 LLVM_ENABLE_THREADS
 
+/* Define if zlib compression is available */
+#cmakedefine01 LLVM_ENABLE_ZLIB
+
 /* Installation directory for config files */
 #cmakedefine LLVM_ETCDIR "${LLVM_ETCDIR}"
 
diff --git a/include/llvm/Config/config.h.in b/include/llvm/Config/config.h.in
index 5a3d02c553..7f75f4df69 100644
--- a/include/llvm/Config/config.h.in
+++ b/include/llvm/Config/config.h.in
@@ -226,6 +226,9 @@
 /* Define to 1 if you have the `udis86' library (-ludis86). */
 #undef HAVE_LIBUDIS86
 
+/* Define to 1 if you have the `z' library (-lz). */
+#undef HAVE_LIBZ
+
 /* Define to 1 if you have the <limits.h> header file. */
 #undef HAVE_LIMITS_H
 
@@ -503,6 +506,9 @@
 /* Define if the xdot.py program is available */
 #undef HAVE_XDOT_PY
 
+/* Define to 1 if you have the <zlib.h> header file. */
+#undef HAVE_ZLIB_H
+
 /* Have host's _alloca */
 #undef HAVE__ALLOCA
 
@@ -575,6 +581,9 @@
 /* Define if threads enabled */
 #undef LLVM_ENABLE_THREADS
 
+/* Define if zlib is enabled */
+#undef LLVM_ENABLE_ZLIB
+
 /* Installation directory for config files */
 #undef LLVM_ETCDIR
 
diff --git a/include/llvm/Support/Compression.h b/include/llvm/Support/Compression.h
new file mode 100644
index 0000000000..9b1142d035
--- /dev/null
+++ b/include/llvm/Support/Compression.h
@@ -0,0 +1,58 @@
+//===-- llvm/Support/Compression.h ---Compression----------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains basic functions for compression/uncompression.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_COMPRESSION_H
+#define LLVM_SUPPORT_COMPRESSION_H
+
+#include "llvm/Support/DataTypes.h"
+
+namespace llvm {
+
+class MemoryBuffer;
+template<typename T> class OwningPtr;
+class StringRef;
+
+namespace zlib {
+
+enum CompressionLevel {
+  NoCompression,
+  DefaultCompression,
+  BestSpeedCompression,
+  BestSizeCompression
+};
+
+enum Status {
+  StatusOK,
+  StatusUnsupported,  // zlib is unavaliable
+  StatusOutOfMemory,  // there was not enough memory
+  StatusBufferTooShort,  // there was not enough room in the output buffer
+  StatusInvalidArg,  // invalid input parameter
+  StatusInvalidData  // data was corrupted or incomplete
+};
+
+bool isAvailable();
+
+Status compress(StringRef InputBuffer,
+                OwningPtr<MemoryBuffer> &CompressedBuffer,
+                CompressionLevel Level = DefaultCompression);
+
+Status uncompress(StringRef InputBuffer,
+                  OwningPtr<MemoryBuffer> &UncompressedBuffer,
+                  size_t UncompressedSize);
+
+}  // End of namespace zlib
+
+} // End of namespace llvm
+
+#endif
+