From a5be5134c8d5205cefa30ca208ac4a288d378cc1 Mon Sep 17 00:00:00 2001
From: shenleban tongying <shenlebantongying@gmail.com>
Date: Sat, 8 Jul 2023 16:29:54 -0400
Subject: [PATCH] clean: remove zstd related code which is unused since the
 migration to libzim

---
 CMake_Unix.cmake                        |  1 -
 goldendict.pro                          |  2 +-
 src/decompress.cc                       | 43 -------------------------
 src/decompress.hh                       |  2 --
 website/docs/howto/build_from_source.md |  2 +-
 5 files changed, 2 insertions(+), 48 deletions(-)

diff --git a/CMake_Unix.cmake b/CMake_Unix.cmake
index 358b710a..431a3826 100644
--- a/CMake_Unix.cmake
+++ b/CMake_Unix.cmake
@@ -40,7 +40,6 @@ pkg_check_modules(PKGCONFIG_DEPS IMPORTED_TARGET
         vorbis # .ogg
         vorbisfile
         liblzma
-        libzstd
         )
 
 target_link_libraries(${GOLDENDICT} PRIVATE
diff --git a/goldendict.pro b/goldendict.pro
index c17d664a..7600ed97 100644
--- a/goldendict.pro
+++ b/goldendict.pro
@@ -552,7 +552,7 @@ SOURCES += src/common/wildcard.cc
 
 CONFIG( zim_support ) {
   DEFINES += MAKE_ZIM_SUPPORT
-  LIBS += -llzma -lzstd -lzim
+  LIBS += -llzma -lzim
 
     win32{
       Debug: LIBS+= -L$$PWD/winlibs/lib/dbg/
diff --git a/src/decompress.cc b/src/decompress.cc
index 9e348317..4a7b7b07 100644
--- a/src/decompress.cc
+++ b/src/decompress.cc
@@ -4,7 +4,6 @@
 
 #ifdef MAKE_ZIM_SUPPORT
 #include "lzma.h"
-#include "zstd.h"
 #endif
 
 #define CHUNK_SIZE 2048
@@ -132,46 +131,4 @@ char buf[CHUNK_SIZE];
   return str;
 }
 
-string decompressZstd( const char *bufptr, unsigned length )
-{
-  string str;
-  char buf[CHUNK_SIZE];
-  size_t res;
-//  string err;
-  ZSTD_DStream *zds;
-  ZSTD_inBuffer in_buf = { bufptr, length, 0 };
-  ZSTD_outBuffer out_buf = { buf, CHUNK_SIZE, 0 };
-
-  zds = ZSTD_createDStream();
-  if( !zds )
-    return str;
-
-  res = ZSTD_initDStream( zds );
-  if( ZSTD_isError( res ) )
-  {
-//    err = string( ZSTD_getErrorName( res ) );
-    ZSTD_freeDStream( zds );
-    return str;
-  }
-
-  do
-  {
-    out_buf.pos = 0;
-    res = ZSTD_decompressStream( zds, &out_buf, &in_buf );
-    if( ZSTD_isError( res ) )
-    {
-//      err = string( ZSTD_getErrorName( res ) );
-      ZSTD_freeDStream( zds );
-      return string();
-    }
-
-    str.append( buf, out_buf.pos );
-  }
-  while( out_buf.pos >= out_buf.size );
-
-  ZSTD_freeDStream( zds );
-
-  return str;
-}
-
 #endif
diff --git a/src/decompress.hh b/src/decompress.hh
index c57593ff..c5b6254b 100644
--- a/src/decompress.hh
+++ b/src/decompress.hh
@@ -17,8 +17,6 @@ string decompressBzip2( const char * bufptr, unsigned length );
 string decompressLzma2( const char * bufptr, unsigned length,
                         bool raw_decoder = false );
 
-string decompressZstd( const char * bufptr, unsigned length );
-
 #endif
 
 #endif // DECOMPRESS_HH
diff --git a/website/docs/howto/build_from_source.md b/website/docs/howto/build_from_source.md
index da87e7ea..a9b09414 100644
--- a/website/docs/howto/build_from_source.md
+++ b/website/docs/howto/build_from_source.md
@@ -29,11 +29,11 @@ In other words, those libraries
 * x11 (linux only)
 
 And a few compression libraries:
+
 * xz (lzma)
 * bzip2
 * lzo2
 * zlib
-* zstd
 
 ## CMake Build