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/* <!-- copyright */
/*
* aria2 - a simple utility for downloading files faster
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* copyright --> */
#include "MetaFileUtil.h"
#include "File.h"
#include "DlAbortEx.h"
#include "message.h"
#include <string.h>
#include <stdlib.h>
MetaEntry* MetaFileUtil::parseMetaFile(const string& file) {
File f(file);
int len = f.size();
char* buf = new char[len];
FILE* fp = fopen(file.c_str(), "r+");
try {
if(fp == NULL) {
throw new DlAbortEx("cannot open metainfo file");
}
if(fread(buf, len, 1, fp) != 1) {
fclose(fp);
throw new DlAbortEx("cannot read metainfo");
}
fclose(fp);
fp = NULL;
MetaEntry* entry = bdecoding(buf, len);
delete [] buf;
return entry;
} catch(Exception* ex) {
delete [] buf;
if(fp != NULL) {
fclose(fp);
}
throw;
}
}
MetaEntry* MetaFileUtil::bdecoding(const char* buf, int len) {
MetaEntry* entry = NULL;
try{
const char* p = buf;
const char* end = buf+len;
entry = bdecodingR(&p, end);
return entry;
} catch(DlAbortEx* ex) {
if(entry != NULL) {
delete entry;
}
throw;
}
}
MetaEntry* MetaFileUtil::bdecodingR(const char** pp, const char* end) {
if(*pp >= end) {
throw new DlAbortEx("mulformed metainfo");
}
MetaEntry* e;
switch(**pp) {
case 'd':
(*pp)++;
e = parseDictionaryTree(pp, end);
break;
case 'l':
(*pp)++;
e = parseListTree(pp, end);
break;
case 'i':
(*pp)++;
e = decodeInt(pp, end);
break;
default:
e = decodeWord(pp, end);
}
return e;
}
Dictionary* MetaFileUtil::parseDictionaryTree(const char** pp, const char* end) {
if(*pp >= end) {
throw new DlAbortEx("mulformed metainfo");
}
Dictionary* dic = new Dictionary();
try {
while(1) {
if(**pp == 'e') {
(*pp)++;
break;
}
string name = decodeWordAsString(pp, end);
MetaEntry* e = bdecodingR(pp, end);
dic->put(name, e);
}
return dic;
} catch(Exception* ex) {
delete dic;
throw;
}
}
List* MetaFileUtil::parseListTree(const char** pp, const char* end) {
if(*pp >= end) {
throw new DlAbortEx("mulformed metainfo");
}
List* lis = new List();
try {
while(1) {
if(**pp == 'e') {
(*pp)++;
break;
}
MetaEntry* e = bdecodingR(pp, end);
lis->add(e);
}
return lis;
} catch(Exception* ex) {
delete lis;
throw;
}
}
Data* MetaFileUtil::decodeInt(const char** pp, const char* end) {
if(*pp >= end) {
throw new DlAbortEx(EX_MULFORMED_META_INFO);
}
char* endTerm = (char*)memchr(*pp, 'e', end-*pp);
// TODO if endTerm is null
if(endTerm == NULL) {
throw new DlAbortEx(EX_MULFORMED_META_INFO);
}
int numSize = endTerm-*pp;
Data* data = new Data(*pp, numSize, true);
*pp += numSize+1;
return data;
}
Data* MetaFileUtil::decodeWord(const char** pp, const char* end) {
if(*pp >= end) {
throw new DlAbortEx("mulformed metainfo");
}
char* delim = (char*)memchr(*pp, ':', end-*pp);
// TODO if delim is null
if(delim == *pp || delim == NULL) {
throw new DlAbortEx(EX_MULFORMED_META_INFO);
}
int numSize = delim-*pp;
char* temp = new char[numSize+1];
memcpy(temp, *pp, numSize);
temp[numSize] = '\0';
char* endptr;
int size = strtol(temp, &endptr, 10);
if(*endptr != '\0') {
delete [] temp;
throw new DlAbortEx(EX_MULFORMED_META_INFO);
}
delete [] temp;
if(delim+1+size > end) {
throw new DlAbortEx(EX_MULFORMED_META_INFO);
}
Data* data = new Data(delim+1, size);
*pp = delim+1+size;
return data;
}
string MetaFileUtil::decodeWordAsString(const char** pp, const char* end) {
Data* data = decodeWord(pp, end);
string str = data->toString();
delete data;
return str;
}
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