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/*
* Copyright 2020 NXP.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* Neither the name of the NXP Semiconductor nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <stdint.h>
#include <map>
#include <string>
#include <vector>
#include "zlib.h"
#include <memory>
#include "buffer.h"
#include "liberror.h"
#include "libuuu.h"
#include <stdio.h>
#include <string.h>
#include "tar.h"
#include <fstream>
#include <iostream>
using namespace std;
int Tar::Open(const string &filename)
{
bool end_of_file=false;
char end_of_file_blocks[2*TAR_BLOCK_SIZE];
memset(end_of_file_blocks, 0, sizeof(end_of_file_blocks) );
m_tarfilename=filename;
shared_ptr<FileBuffer> file = get_file_buffer(filename);
if(file == nullptr)
return -1;
uint8_t* data=file->data();
uint64_t block_counter=0;
while(!end_of_file)
{
if(!memcmp(end_of_file_blocks,data+block_counter*TAR_BLOCK_SIZE,TAR_BLOCK_SIZE))
{
end_of_file=true;
break;
}
struct Tar_header* th=(Tar_header*)(data+block_counter*TAR_BLOCK_SIZE);
uint64_t size;
string octal_str((char*)th->size);
//printf("block_counter: %d\n",block_counter );
//printf("name: %s\n",th->name );
//printf("signature: %s\n",th->ustar );
//printf("size: %s\n", th->size);
size=stoll(octal_str, 0, 8);
string name((char*)th->name);
m_filemap[name].size=size;
m_filemap[name].offset=(block_counter+1)*TAR_BLOCK_SIZE; //+1 because the data located right after the header block
m_filemap[name].filename.assign((char*)th->name);
block_counter++;
//skip the data blocks
uint64_t data_block_num=size/TAR_BLOCK_SIZE;
data_block_num += (size%TAR_BLOCK_SIZE>0)? 1:0;
block_counter+=data_block_num;
}
return 0;
}
bool Tar::check_file_exist(const string &filename)
{
if (m_filemap.find(filename) == m_filemap.end())
{
string err;
err += "Can't find file ";
err += filename;
set_last_err_string(err);
return false;
}
return true;
}
int Tar::get_file_buff(const string &filename, shared_ptr<FileBuffer> p )
{
if (m_filemap.find(filename) == m_filemap.end())
{
string err;
err += "Can't find file ";
err += filename;
set_last_err_string(err);
return -1;
}
p->resize(m_filemap[filename].size);
atomic_fetch_or(&p->m_dataflags, FILEBUFFER_FLAG_KNOWN_SIZE);
p->m_request_cv.notify_all();
shared_ptr<FileBuffer> file;
file = get_file_buffer(m_tarfilename);
size_t offset= m_filemap[filename].offset;
size_t size=m_filemap[filename].size;
p->ref_other_buffer(file, offset, size);
atomic_fetch_or(&p->m_dataflags, FILEBUFFER_FLAG_LOADED);
p->m_request_cv.notify_all();
return 0;
}
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