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/* -*- c++ -*- */
/*
* Copyright 2010 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include <cstdio>
#include <cstdlib>
#include <string>
#include <iostream>
#include <fstream>
#include <vector>
#include <map>
#include <libguile.h>
#include <libguile/ports.h>
#include <boost/cstdint.hpp>
#include <boost/shared_ptr.hpp>
// Include our definitions
#include "xyzzy.h"
using namespace std;
typedef void* handle_t;
XYZZY::XYZZY()
{
// nothing to initialize
}
XYZZY::~XYZZY()
{
_contents.clear();
}
// Initialize with the data file produced by gen-xyzzy.
bool
XYZZY::init()
{
_filespec = DATAROOTDIR;
_filespec += "/gnuradio/gr-run-waveform/";
_filespec += "filesystem.dat";
return init(_filespec);
};
bool
XYZZY::init(const std::string &file)
{
ifstream in(file.c_str(), ios_base::binary|ios_base::in);
if (!in) {
cerr << ("gr-run-waveform: couldn't open data file: ") << file << endl;
return false;
}
size_t length = sizeof(struct header);
char head[length];
in.read(head, length);
boost::shared_ptr<struct header> header = read_header(reinterpret_cast<boost::uint8_t *>(&head));
// Check the magic number to make sure it's the right type of file.
if (strncmp(header->magic, "-XyZzY-", 8) != 0) {
cerr << "ERROR: bad magic number" << endl;
return false;
}
// Read in the Directory table
length = sizeof(struct directory_entry);
char dir[length];
boost::uint32_t ssize;
for (size_t i=0; i<header->number_of_dir_entries; ++i) {
in.read(dir, length);
int store = in.tellg();
boost::shared_ptr<struct directory_entry> entry = read_dir_entry(
reinterpret_cast<boost::uint8_t *>(dir));
// Get the file name
in.seekg(header->offset_to_strings + entry->offset_to_name);
string name = XYZZY::read_string(in);
// cout << name << endl;
// Get the contents, which is one big string
in.seekg(header->offset_to_strings + entry->offset_to_contents);
string contents = XYZZY::read_string(in);
// cout << contents << endl;
in.seekg(store);
_contents[name] = contents;
}
// cout << "Loaded " << _contents.size() << " Filesystem entries" << endl;
in.close();
return true;
};
// Does a file with name 'filename' exist in magic filesystem?
// bool file_exists(handle, const std::string &filespec);
bool
XYZZY::file_exists(const std::string &filespec)
{
if (filespec.substr(0, 9) == "/-xyzzy-/") {
// look for prefix
std::map<std::string, std::string>::iterator it;
it = _contents.find(filespec.substr(9, filespec.size()));
if (it != _contents.end()) {
return true;
}
return false;
}
return false;
}
string
XYZZY::read_string(boost::uint8_t *entry, size_t length)
{
string str(reinterpret_cast<const char *>(entry), length);
return str;
}
string
XYZZY::read_string(struct string_entry & entry)
{
return read_string(entry.base, entry.length);
}
string
XYZZY::read_string(std::ifstream &stream)
{
boost::uint32_t length;
char num[sizeof(boost::uint32_t)];
stream.read(reinterpret_cast<char *>(&length), sizeof(boost::uint32_t));
boost::uint32_t len = __builtin_bswap32(length);
// All the strings are 32 bit word aligned, so we have to adjust
// how many bytes to read.
size_t padding = sizeof(boost::uint32_t) - (len % sizeof(boost::uint32_t));
size_t newsize = (padding == 4) ? len : len + padding;
char sstr[newsize];
// Read the string
stream.read(sstr, newsize);
string filespec(reinterpret_cast<const char *>(sstr), len);
return filespec;
}
boost::shared_ptr<struct header>
XYZZY::read_header(boost::uint8_t *header)
{
boost::shared_ptr<struct header> newhead(new struct header);
struct header *ptr = reinterpret_cast<struct header *>(header);
std::copy(header, header + 8, newhead->magic);
newhead->offset_to_directory = __builtin_bswap32(ptr->offset_to_directory);
newhead->size_of_directory = __builtin_bswap32(ptr->size_of_directory);
newhead->number_of_dir_entries = __builtin_bswap32(ptr->number_of_dir_entries);
newhead->offset_to_strings = __builtin_bswap32(ptr->offset_to_strings);
newhead->size_of_strings = __builtin_bswap32(ptr->size_of_strings);
return newhead;
}
boost::shared_ptr<struct directory_entry>
XYZZY::read_dir_entry(boost::uint8_t *entry)
{
boost::shared_ptr<struct directory_entry> newdir(new struct directory_entry);
struct directory_entry *ptr = reinterpret_cast<struct directory_entry *>(entry);
newdir->offset_to_name = __builtin_bswap32(ptr->offset_to_name);
newdir->offset_to_contents = __builtin_bswap32(ptr->offset_to_contents);
return newdir;
}
// C linkage for guile
extern "C" {
static XYZZY datafile;
SCM
xyzzy_open_file(SCM filename)
#define FUNC_NAME "xyzzy-open-file"
{
const char *c_filename = scm_to_locale_string(filename);
// fprintf(stderr, "TRACE %s: %d, %s\n", __FUNCTION__, __LINE__, c_filename);
if (!xyzzy_file_exists(c_filename)){
SCM_MISC_ERROR("file does not exist: ~S", scm_list_1(filename));
}
std::string filespec(c_filename);
std::string &contents = datafile.get_contents(filespec.substr(9, filespec.size()));
SCM port = scm_open_input_string (scm_from_locale_string (contents.c_str()));
return port;
}
#undef FUNC_NAME
// Initialize with the data file produced by gen-xyzzy.
int
xyzzy_init(const char *filespec)
{
if (filespec == 0 || *filespec == 0)
return datafile.init();
else
return datafile.init(filespec);
}
// Does a file with name 'filename' exist in magic filesystem?
int
xyzzy_file_exists(const char *filespec)
{
return datafile.file_exists(filespec);
}
} // end of extern C
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