From 66a1d3bc639066f18e1fcb89489cf8b9680fd999 Mon Sep 17 00:00:00 2001
From: Oz <rik20@live.it>
Date: Tue, 28 Nov 2023 21:03:21 +0100
Subject: [PATCH] Add check for invalid indices in BitInputArchive's extractTo
 filesystem

---
 include/bit7z/bitextractor.hpp    | 12 ------------
 include/bit7z/bitinputarchive.hpp |  9 ++++++++-
 src/bitinputarchive.cpp           | 19 +++++++++++++++++++
 3 files changed, 27 insertions(+), 13 deletions(-)

diff --git a/include/bit7z/bitextractor.hpp b/include/bit7z/bitextractor.hpp
index 80007392..229ceaf8 100644
--- a/include/bit7z/bitextractor.hpp
+++ b/include/bit7z/bitextractor.hpp
@@ -169,18 +169,6 @@ class BitExtractor final : public BitAbstractArchiveOpener {
             }
 
             BitInputArchive inputArchive( *this, inArchive );
-            uint32_t nItems = inputArchive.itemsCount();
-            // Find if any index passed by the user is not in the valid range [0, itemsCount() - 1]
-            const auto findRes = std::find_if( indices.cbegin(),
-                                               indices.cend(),
-                                               [ &nItems ]( uint32_t index ) -> bool {
-                                                    return index >= nItems;
-                                                } );
-            if ( findRes != indices.cend() ) {
-                throw BitException( "Cannot extract item at the index " + std::to_string( *findRes ),
-                                    make_error_code( BitError::InvalidIndex ) );
-            }
-
             inputArchive.extractTo( outDir, indices );
         }
 
diff --git a/include/bit7z/bitinputarchive.hpp b/include/bit7z/bitinputarchive.hpp
index c604b5bc..ca5db49f 100644
--- a/include/bit7z/bitinputarchive.hpp
+++ b/include/bit7z/bitinputarchive.hpp
@@ -144,13 +144,20 @@ class BitInputArchive {
             extractTo( outDir, indices );
         }
 
+        /**
+         * @brief Extracts the archive to the chosen directory.
+         *
+         * @param outDir   the output directory where the extracted files will be put.
+         */
+        void extractTo( const tstring& outDir ) const;
+
         /**
          * @brief Extracts the specified items to the chosen directory.
          *
          * @param outDir   the output directory where the extracted files will be put.
          * @param indices  the indices of the files in the archive that must be extracted.
          */
-        void extractTo( const tstring& outDir, const std::vector< uint32_t >& indices = {} ) const;
+        void extractTo( const tstring& outDir, const std::vector< uint32_t >& indices ) const;
 
         BIT7Z_DEPRECATED_MSG("Since v4.0; please, use the extractTo method.")
         inline void extract( buffer_t& outBuffer, uint32_t index = 0 ) const {
diff --git a/src/bitinputarchive.cpp b/src/bitinputarchive.cpp
index 8d79b654..9c4869bd 100644
--- a/src/bitinputarchive.cpp
+++ b/src/bitinputarchive.cpp
@@ -233,7 +233,26 @@ auto BitInputArchive::handler() const noexcept -> const BitAbstractArchiveHandle
     return mArchiveHandler;
 }
 
+void BitInputArchive::extractTo( const tstring& outDir ) const {
+    auto callback = bit7z::make_com< FileExtractCallback, ExtractCallback >( *this, outDir );
+    extract_arc( mInArchive, {}, callback );
+}
+
+inline auto findInvalidIndex( const std::vector< uint32_t >& indices,
+                              uint32_t itemsCount ) -> std::vector< uint32_t >::const_iterator {
+    return std::find_if( indices.cbegin(), indices.cend(), [&]( uint32_t index ) -> bool {
+        return index >= itemsCount;
+    });
+}
+
 void BitInputArchive::extractTo( const tstring& outDir, const std::vector< uint32_t >& indices ) const {
+    // Find if any index passed by the user is not in the valid range [0, itemsCount() - 1]
+    const auto invalidIndex = findInvalidIndex( indices, itemsCount() );
+    if ( invalidIndex != indices.cend() ) {
+        throw BitException( "Cannot extract item at the index " + std::to_string( *invalidIndex ),
+                            make_error_code( BitError::InvalidIndex ) );
+    }
+
     auto callback = bit7z::make_com< FileExtractCallback, ExtractCallback >( *this, outDir );
     extract_arc( mInArchive, indices, callback );
 }