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#include "../include/Archive.hpp"
#include "../include/utils.hpp"
#include <cstring>
#include <archive.h>
#include <archive_entry.h>
using namespace std;
#if OS_FAMILY == OS_FAMILY_POSIX
#define archive_read_open_filename_native archive_read_open_filename
#define archive_entry_pathname_native archive_entry_pathname
#else
#define archive_read_open_filename_native archive_read_open_filename_w
#define archive_entry_pathname_native archive_entry_pathname_w
#endif
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;
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 _tinydir_char_t *source, const _tinydir_char_t *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;
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_native(a, source, 10240)))
{
string errMsg = "Failed to extract archive: ";
errMsg += toUtf8(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 += toUtf8(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 += toUtf8(source);
errMsg += "; reason: ";
errMsg += archive_error_string(a);
return Result<bool>::Err(errMsg);
}
const _tinydir_char_t* currentFile = archive_entry_pathname_native(entry);
FileString fullOutputPath = destination;
if(!fullOutputPath.empty() && fullOutputPath.back() != '/')
fullOutputPath += '/';
fullOutputPath += currentFile;
// TODO: Verify if this really works. Why doesn't libarchive have wide string version of archive_entry_set_pathname?
string fullOutputPathUtf8 = toUtf8(fullOutputPath);
archive_entry_set_pathname(entry, fullOutputPathUtf8.c_str());
r = archive_write_header(ext, entry);
if (r < ARCHIVE_OK)
{
string errMsg = "Failed to extract archive: ";
errMsg += toUtf8(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 += toUtf8(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 += toUtf8(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 += toUtf8(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 += toUtf8(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);
}
}
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