From f3b7b7d34b3bf2b1be18914577c96b66dead379a Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Tue, 12 Dec 2017 17:33:03 +0100
Subject: Download and extract missing dependencies from github

Using libcurl and libarchive
---
 src/Archive.cpp | 171 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 src/Archive.cpp

(limited to 'src/Archive.cpp')

diff --git a/src/Archive.cpp b/src/Archive.cpp
new file mode 100644
index 0000000..08ab42b
--- /dev/null
+++ b/src/Archive.cpp
@@ -0,0 +1,171 @@
+#include "../include/Archive.hpp"
+#include "../include/utils.hpp"
+#include <cstring>
+#include <archive.h>
+#include <archive_entry.h>
+
+using namespace std;
+
+class FileHandler
+{
+    DISABLE_COPY(FileHandler)
+public:
+    FileHandler(FILE *_file) : file(_file)
+    {
+
+    }
+
+    FileHandler(FileHandler &&other)
+    {
+        file = other.file;
+        other.file = nullptr;
+    }
+
+    ~FileHandler()
+    {
+        fclose(file);
+    }
+
+    FILE *file;
+};
+
+// libarchive code is modified version of: https://github.com/libarchive/libarchive/wiki/Examples#A_Complete_Extractor
+namespace sibs
+{
+    static int copy_data(struct archive *ar, struct archive *aw)
+    {
+        int r;
+        const void *buff;
+        size_t size;
+        la_int64_t offset;
+
+        while(true)
+        {
+            r = archive_read_data_block(ar, &buff, &size, &offset);
+            if (r == ARCHIVE_EOF)
+                return ARCHIVE_OK;
+            else if (r < ARCHIVE_OK)
+                return r;
+
+            r = archive_write_data_block(aw, buff, size, offset);
+            if (r < ARCHIVE_OK)
+                return r;
+        }
+    }
+
+    Result<bool> Archive::extract(const char *source, const char *destination)
+    {
+        struct archive *a;
+        struct archive *ext;
+        struct archive_entry *entry;
+        int flags;
+        int r;
+
+        /* Select which attributes we want to restore. */
+        flags = ARCHIVE_EXTRACT_TIME;
+        flags |= ARCHIVE_EXTRACT_PERM;
+        flags |= ARCHIVE_EXTRACT_ACL;
+        flags |= ARCHIVE_EXTRACT_FFLAGS;
+
+        string rootName;
+
+        a = archive_read_new();
+        archive_read_support_format_all(a);
+        archive_read_support_compression_all(a);
+        ext = archive_write_disk_new();
+        archive_write_disk_set_options(ext, flags);
+        archive_write_disk_set_standard_lookup(ext);
+
+
+        if ((r = archive_read_open_filename(a, source, 10240)))
+        {
+            string errMsg = "Failed to extract archive: ";
+            errMsg += source;
+            return Result<bool>::Err(errMsg);
+        }
+
+        while(true)
+        {
+            r = archive_read_next_header(a, &entry);
+            if (r == ARCHIVE_EOF)
+                break;
+            else if (r < ARCHIVE_OK)
+            {
+                string errMsg = "Failed to extract archive: ";
+                errMsg += source;
+                errMsg += "; reason: ";
+                errMsg += archive_error_string(a);
+                return Result<bool>::Err(errMsg);
+            }
+            else if (r < ARCHIVE_WARN)
+            {
+                string errMsg = "Failed to extract archive: ";
+                errMsg += source;
+                errMsg += "; reason: ";
+                errMsg += archive_error_string(a);
+                return Result<bool>::Err(errMsg);
+            }
+
+            const char* currentFile = archive_entry_pathname(entry);
+            if(rootName.empty())
+                rootName = currentFile;
+
+            std::string fullOutputPath = destination;
+            fullOutputPath += (currentFile + (rootName.empty() ? 0 : rootName.size() - 1));
+            archive_entry_set_pathname(entry, fullOutputPath.c_str());
+
+            r = archive_write_header(ext, entry);
+            if (r < ARCHIVE_OK)
+            {
+                string errMsg = "Failed to extract archive: ";
+                errMsg += source;
+                errMsg += "; reason: ";
+                errMsg += archive_error_string(ext);
+                return Result<bool>::Err(errMsg);
+            }
+            else if (archive_entry_size(entry) > 0) {
+                r = copy_data(a, ext);
+                if (r < ARCHIVE_OK)
+                {
+                    string errMsg = "Failed to extract archive: ";
+                    errMsg += source;
+                    errMsg += "; reason: ";
+                    errMsg += archive_error_string(ext);
+                    return Result<bool>::Err(errMsg);
+                }
+                else if (r < ARCHIVE_WARN)
+                {
+                    string errMsg = "Failed to extract archive: ";
+                    errMsg += source;
+                    errMsg += "; reason: ";
+                    errMsg += archive_error_string(ext);
+                    return Result<bool>::Err(errMsg);
+                }
+            }
+
+            r = archive_write_finish_entry(ext);
+            if (r < ARCHIVE_OK)
+            {
+                string errMsg = "Failed to extract archive: ";
+                errMsg += source;
+                errMsg += "; reason: ";
+                errMsg += archive_error_string(ext);
+                return Result<bool>::Err(errMsg);
+            }
+            else if (r < ARCHIVE_WARN)
+            {
+                string errMsg = "Failed to extract archive: ";
+                errMsg += source;
+                errMsg += "; reason: ";
+                errMsg += archive_error_string(ext);
+                return Result<bool>::Err(errMsg);
+            }
+        }
+
+        archive_read_close(a);
+        archive_read_free(a);
+        archive_write_close(ext);
+        archive_write_free(ext);
+        return Result<bool>::Ok(true);
+    }
+}
\ No newline at end of file
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