From 8ecaec4c703ea8feae104b8301dd0095cb9c1cae Mon Sep 17 00:00:00 2001
From: Steve Lhomme <robux4@ycbcr.xyz>
Date: Sun, 3 May 2020 09:38:01 +0200
Subject: [PATCH] Add a C wrapper for decompression

---
 CMakeLists.txt          |  2 ++
 lzokay-c/CMakeLists.txt |  5 +++++
 lzokay-c/lzokay-c.cpp   | 20 ++++++++++++++++++++
 lzokay-c/lzokay-c.h     | 27 +++++++++++++++++++++++++++
 4 files changed, 54 insertions(+)
 create mode 100644 lzokay-c/CMakeLists.txt
 create mode 100644 lzokay-c/lzokay-c.cpp
 create mode 100644 lzokay-c/lzokay-c.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c6cfd8a..989326d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,3 +52,5 @@ install(
     FILES "${config_file}" "${version_config_file}"
     DESTINATION ${config_install_dir}
 )
+
+add_subdirectory("lzokay-c")
diff --git a/lzokay-c/CMakeLists.txt b/lzokay-c/CMakeLists.txt
new file mode 100644
index 0000000..d0f7c2c
--- /dev/null
+++ b/lzokay-c/CMakeLists.txt
@@ -0,0 +1,5 @@
+project(lzokay-c VERSION 0.1 LANGUAGES C CXX)
+
+add_library(lzokay-c lzokay-c.cpp lzokay-c.h)
+target_link_libraries(lzokay-c PRIVATE lzokay)
+set_target_properties(lzokay-c PROPERTIES CXX_STANDARD 14)
diff --git a/lzokay-c/lzokay-c.cpp b/lzokay-c/lzokay-c.cpp
new file mode 100644
index 0000000..0a79c5a
--- /dev/null
+++ b/lzokay-c/lzokay-c.cpp
@@ -0,0 +1,20 @@
+#include "lzokay-c.h"
+#include "../lzokay.hpp"
+
+static_assert(EResult_LookbehindOverrun == lzokay_EResult(lzokay::EResult::LookbehindOverrun), "LookbehindOverrun mismatch");
+static_assert(EResult_OutputOverrun == lzokay_EResult(lzokay::EResult::OutputOverrun), "OutputOverrun mismatch");
+static_assert(EResult_InputOverrun == lzokay_EResult(lzokay::EResult::InputOverrun), "InputOverrun mismatch");
+static_assert(EResult_Error == lzokay_EResult(lzokay::EResult::Error), "Error mismatch");
+static_assert(EResult_Success == lzokay_EResult(lzokay::EResult::Success), "Success mismatch");
+static_assert(EResult_InputNotConsumed == lzokay_EResult(lzokay::EResult::InputNotConsumed), "InputNotConsumed mismatch");
+
+extern "C"
+lzokay_EResult lzokay_decompress(const uint8_t * src, size_t src_size, 
+                                 uint8_t *output, size_t *output_len)
+{
+    size_t needed_size = 0;
+    lzokay::EResult error =
+        lzokay::decompress(src, src_size, output, *output_len, needed_size);
+    *output_len = needed_size;
+    return lzokay_EResult(error);
+}
diff --git a/lzokay-c/lzokay-c.h b/lzokay-c/lzokay-c.h
new file mode 100644
index 0000000..faa9a3d
--- /dev/null
+++ b/lzokay-c/lzokay-c.h
@@ -0,0 +1,27 @@
+#ifndef LZOKAY_C_INCLUDED
+#define LZOKAY_C_INCLUDED
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stddef.h>
+
+typedef enum {
+  EResult_LookbehindOverrun = -4,
+  EResult_OutputOverrun = -3,
+  EResult_InputOverrun = -2,
+  EResult_Error = -1,
+  EResult_Success = 0,
+  EResult_InputNotConsumed = 1,
+} lzokay_EResult;
+
+lzokay_EResult lzokay_decompress(const uint8_t * src, size_t src_size, 
+                                 uint8_t *output, size_t *output_len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // LZOKAY_C_INCLUDED