Basic zip file support.

Dumping the TOC works.

.drone.yml

@@ -26,7 +26,7 @@ steps:
   - alias apt-get='rm -f /var/cache/apt/archives/lock && apt-get'
   - apt-get update -q
   - apt-get install -qq build-essential cmake clang
-  - apt-get install -qq catch libboost-all-dev gettext
+  - apt-get install -qq catch libboost-all-dev gettext libarchive-dev
   - rm -rf build && mkdir -p build && cd build
   - cmake -G "Unix Makefiles" -DWITH_TESTS=YES ..
   - make VERBOSE=1
@@ -42,10 +42,10 @@ steps:
   - name: debian-package-cache
     path: /var/cache/apt/archives
 
-- name: Download CMake 3.12 installer
+- name: Download CMake 3.17 installer
   image: plugins/download
   settings:
-    source: https://cmake.org/files/v3.12/cmake-3.12.0-Linux-x86_64.sh
+    source: https://cmake.org/files/v3.17/cmake-3.17.0-Linux-x86_64.sh
     destination: cmake_installer.sh
 
 - name: GCC 7 / clang 6
@@ -61,7 +61,7 @@ steps:
   - alias apt-get='rm -f /var/cache/apt/archives/lock && apt-get'
   - apt-get update -q
   - apt-get install -qq build-essential clang
-  - apt-get install -qq catch libboost-all-dev gettext
+  - apt-get install -qq catch libboost-all-dev gettext libarchive-dev
   - sh cmake_installer.sh --skip-license --exclude-subdir --prefix=/usr/local
   - rm -rf build && mkdir -p build && cd build
   - cmake -G "Unix Makefiles" -DWITH_TESTS=YES ..

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.12...3.18)
+cmake_minimum_required(VERSION 3.17...3.18)
 
 # Global build options.
 set(CMAKE_BUILD_TYPE "Release" CACHE STRING "The type of build.")
@@ -24,6 +24,7 @@ include(cmake/debug_flags.cmake)
 find_package(Boost 1.65.0 REQUIRED COMPONENTS program_options locale)
 find_package(Gettext REQUIRED)
 find_package(Filesystem REQUIRED COMPONENTS Final Experimental)
+find_package(LibArchive REQUIRED)
 
 add_subdirectory(src)
 

README.adoc

@@ -11,6 +11,7 @@
 :uri-catch: https://github.com/catchorg/Catch2
 :uri-boost: https://www.boost.org/
 :uri-gettext: https://www.gnu.org/software/gettext/
+:uri-libarchive: https://www.libarchive.org/
 
 *{project}* is a search tool for EPUB ebooks.
 
@@ -36,9 +37,10 @@ image::https://repology.org/badge/vertical-allrepos/epubgrep.svg[]
 * Tested OS: Linux
 * C\++ compiler with C++17 support (tested: link:{uri-gcc}[GCC] 7/10,
   link:{uri-clang}[clang] 6/11)
-* link:{uri-cmake}[CMake] (at least: 3.12)
+* link:{uri-cmake}[CMake] (at least: 3.17)
 * link:{uri-boost}[Boost] (tested: 1.75.0 / 1.65.0)
 * link:{uri-gettext}[gettext] (tested: 0.21 / 0.19)
+* link:{uri-libarchive}[libarchive] (tested: 3.5 / 3.2)
 * Optional
   ** Tests: link:{uri-catch}[Catch] (tested: 2.13 / 1.10)
 

src/CMakeLists.txt

@@ -14,7 +14,7 @@ unset(headers_src)
 
 target_link_libraries(${PROJECT_NAME}
   Boost::program_options Boost::locale
-  std::filesystem)
+  std::filesystem LibArchive::LibArchive)
 
 target_include_directories(${PROJECT_NAME}
   PRIVATE "$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>")

src/main.cpp

@@ -15,6 +15,7 @@
  */
 
 #include "options.hpp"
+#include "zip.hpp"
 
 #include <boost/locale/generator.hpp>
 #include <boost/locale/message.hpp>
@@ -64,13 +65,16 @@ int main(int argc, char *argv[])
     cout << "perl-regexp: " << vm.count("perl-regexp") << '\n';
     cout << "ignore-case: " << vm.count("ignore-case") << '\n';
 
-    if (vm.count("input") > 0)
+    if (vm.count("input-file") > 0)
     {
         cout << "\nINPUT FILES: ";
-        for (const auto &input : vm["input"].as<std::vector<std::string>>())
+        for (const auto &file : vm["input-file"].as<std::vector<std::string>>())
         {
-            cout << input << " ";
-        }
-        cout << '\n';
+            cout << "  " << file << ":\n";
+            for (const auto &entry : epubgrep::zip::list(file))
+            {
+                cout << "    " << entry << '\n';
+            }
+        }
     }
 }

src/zip.cpp

@@ -0,0 +1,64 @@
+/*  This file is part of epubgrep.
+ *  Copyright © 2021 tastytea <tastytea@tastytea.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received zipfile copy of the GNU Affero General Public
+ * License along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "zip.hpp"
+
+#include "fs-compat.hpp"
+
+#include <archive.h>
+#include <archive_entry.h>
+
+#include <string>
+#include <vector>
+
+namespace epubgrep::zip
+{
+
+std::vector<std::string> list(const fs::path &filepath)
+{
+    struct archive *zipfile{};
+    struct archive_entry *entry{};
+    int result{};
+    std::vector<std::string> toc;
+
+    zipfile = archive_read_new();
+    archive_read_support_filter_all(zipfile);
+    archive_read_support_format_all(zipfile);
+
+    result = archive_read_open_filename(zipfile, filepath.c_str(), 10240);
+    if (result != ARCHIVE_OK)
+    {
+        // NOLINTNEXTLINE
+        throw "Zip file not okay. 🙁";
+    }
+
+    while (archive_read_next_header(zipfile, &entry) == ARCHIVE_OK)
+    {
+        toc.emplace_back(archive_entry_pathname(entry));
+        archive_read_data_skip(zipfile);
+    }
+
+    result = archive_read_free(zipfile);
+    if (result != ARCHIVE_OK)
+    {
+        // NOLINTNEXTLINE
+        throw "Error closing zipfile. 🙁";
+    }
+
+    return toc;
+}
+
+} // namespace epubgrep::zip

src/zip.hpp

@@ -0,0 +1,32 @@
+/*  This file is part of epubgrep.
+ *  Copyright © 2021 tastytea <tastytea@tastytea.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef EPUBGREP_ZIP_HPP
+#define EPUBGREP_ZIP_HPP
+
+#include "fs-compat.hpp"
+
+#include <string>
+#include <vector>
+
+namespace epubgrep::zip
+{
+
+std::vector<std::string> list(const fs::path &filepath);
+
+} // namespace epubgrep::zip
+
+#endif // EPUBGREP_ZIP_HPP