From 7897b205493f3dc1e8861a622d8dae3fdb96c71a Mon Sep 17 00:00:00 2001
From: Jannis Achstetter <kripton@kripserver.net>
Date: Thu, 10 Jun 2021 20:42:55 +0200
Subject: [PATCH] Add snappy as compression algorithm

---
 lib/snappy         |  2 +-
 src/CMakeLists.txt |  3 +++
 src/algo-snappy.c  | 17 +++++++++++++++++
 src/algo-snappy.h  | 10 ++++++++++
 src/main.c         |  9 +++++++++
 5 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 src/algo-snappy.c
 create mode 100644 src/algo-snappy.h

diff --git a/lib/snappy b/lib/snappy
index b638ebe..ddfcc95 160000
--- a/lib/snappy
+++ b/lib/snappy
@@ -1 +1 @@
-Subproject commit b638ebe5d95ec4559921a72f8c2bbc4b1b5a2fd0
+Subproject commit ddfcc955e4c26b0138f647c366443b317d3a8ad9
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 6c387ad..deccb13 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -14,6 +14,7 @@ pico_sdk_init()
 include(../lib/heatshrink/CMakeLists.txt)
 include(../lib/zlib/interfaceLibForPicoSDK.cmake)
 include(../lib/zstd/interfaceLibForPicoSDK.cmake)
+include(../lib/snappy/interfaceLibForPicoSDK.cmake)
 
 ## Add our own C/C++ files here
 ## Sorted alphabetically
@@ -22,6 +23,7 @@ add_executable(${CMAKE_PROJECT_NAME}
     algo-heatshrink.c
     algo-zlib.c
     algo-zstd.c
+    algo-snappy.c
     main.c
 )
 
@@ -51,6 +53,7 @@ target_link_libraries(${CMAKE_PROJECT_NAME}
     pico_stdlib
     zlib
     zstd
+    snappy
 )
 
 ## enable usb output, disable uart output
diff --git a/src/algo-snappy.c b/src/algo-snappy.c
new file mode 100644
index 0000000..d4e9044
--- /dev/null
+++ b/src/algo-snappy.c
@@ -0,0 +1,17 @@
+#include "algo-zlib.h"
+
+#include "../lib/snappy/snappy-c.h"
+
+void mysnappy_init()
+{
+}
+
+void mysnappy_compress(uint8_t *input, size_t insize, uint8_t *output, size_t *outsize)
+{
+    snappy_compress(input, insize, output, outsize);
+}
+
+void mysnappy_uncompress(uint8_t *input, size_t insize, uint8_t *output, size_t *outsize)
+{
+    snappy_uncompress(input, insize, output, outsize); 
+}
diff --git a/src/algo-snappy.h b/src/algo-snappy.h
new file mode 100644
index 0000000..0936ec3
--- /dev/null
+++ b/src/algo-snappy.h
@@ -0,0 +1,10 @@
+#ifndef __ALGO_SNAPPY_H__
+#define __ALGO_SNAPPY_H__
+
+#include "pico/stdlib.h"
+
+void mysnappy_init();
+void mysnappy_compress(uint8_t* input, size_t insize, uint8_t* output, size_t* outsize);
+void mysnappy_uncompress(uint8_t* input, size_t insize, uint8_t* output, size_t* outsize);
+
+#endif // __ALGO_SNAPPY_H__
diff --git a/src/main.c b/src/main.c
index 7147d08..61821cd 100644
--- a/src/main.c
+++ b/src/main.c
@@ -18,6 +18,7 @@
 #include "algo-heatshrink.h"
 #include "algo-zlib.h"
 #include "algo-zstd.h"
+#include "algo-snappy.h"
 
 
 // TEST VECTORS
@@ -54,6 +55,7 @@ enum {
     ALGO_HEATSHRINK,
     ALGO_ZLIB,
     ALGO_ZSTD,
+    ALGO_SNAPPY,
     // Add more HERE
     ALGO_NUM_TOTAL
 };
@@ -198,6 +200,13 @@ int main() {
     algos[ALGO_ZSTD].uncompress = zstd_uncompress;
     algos[ALGO_ZSTD].init();
 
+    // Algo 2: snappy
+    sprintf(algos[ALGO_SNAPPY].name, "SNAPPY");
+    algos[ALGO_SNAPPY].init = mysnappy_init;
+    algos[ALGO_SNAPPY].compress = mysnappy_compress;
+    algos[ALGO_SNAPPY].uncompress = mysnappy_uncompress;
+    algos[ALGO_SNAPPY].init();
+
     finish_time = time_us_32();
     elapsed_time = finish_time - start_time;
     printf("%luµs\n", elapsed_time);