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torrent_parser.c
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torrent_parser.c
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/*******************************************************************************
* File Name: hp_torrent_parser.h
* Author: WANG CHANGQING
* Date: 2011-07-11
* Notes: Used to parse torrent.
******************************************************************************/
#include "torrent_parser.h"
#include "error_code.h"
#include "encoding_cvt.h"
#include "string_utility.h"
#include "fs_utility.h"
#include <stdio.h>
#include <assert.h>
static const int BENCODING_STRING_MAX_LEN = 64 * 1024 * 1024;
static const int64_t TORRENT_PARSER_INVALID_FILE_SIZE = -1;
static int tp_store_dict(TorrentParser *p_torrent, bencoding_dict* p_dict);
static int tp_store_list(TorrentParser *p_torrent, bencoding_list* p_list);
static TorrentSubFileInfo* tp_find_incompleted_file(TorrentParser* p_torrent);
static int tp_add_announce(TorrentParser *p_torrent, bencoding_string *p_ann);
static bencoding_int* bencoding_integer_create(bencoding_item_base *p_parent);
static bencoding_string* bencoding_string_create(bencoding_item_base *p_parent);
static bencoding_list* bencoding_list_create(bencoding_item_base *p_parent);
static bencoding_dict* bencoding_dict_create(bencoding_item_base *p_parent);
static void bencoding_dict_destroy(bencoding_dict *p_dict);
static void bencoding_list_destroy(bencoding_list *p_list);
static void bencoding_string_destroy(bencoding_string *p_string);
static int bencoding_list_add_item(bencoding_list *p_list, bencoding_item_base *p_item);
static TorrentSubFileInfo* tp_torrent_referred_file_create(uint32_t index);
int32_t parse_torrent_from_memory(TorrentParser *torrent,const char *dst_encoding, const char *data,uint32_t length)
{
const int TORRENT_PARSER_PRESUME_TORRENT_MIN_LEN = 2;
tp_torrent_init(torrent);
if(length < TORRENT_PARSER_PRESUME_TORRENT_MIN_LEN){
return ERR_INVALID_PARAMETER;
}
torrent->dst_encoding = (char *)malloc(strlen(dst_encoding)+1);
if(torrent->dst_encoding == NULL){
return ERR_BAD_ALLOC;
}
else{
strcpy(torrent->dst_encoding,dst_encoding);
}
parse_torrent_part(torrent,data,length);
return tp_finish(torrent);;
}
int32_t parse_torrent(TorrentParser *torrent, const char *torrent_path,const char *dst_encoding)
{
const int TORRENT_PARSER_PRESUME_TORRENT_MIN_LEN = 2;
const size_t PARSING_BUFF_LEN = 81920;
char* parsing_buff;
size_t read_len;
size_t result_len;
size_t bytes_not_parsed;
FILE* torrent_file;
int32_t result = 0;
tp_torrent_init(torrent);
parsing_buff = (char *)malloc(PARSING_BUFF_LEN);
if(parsing_buff == NULL){
return ERR_BAD_ALLOC;
}
torrent_file = fopen(torrent_path,"r");
if(torrent_file == NULL){
free(parsing_buff);
return ERR_INVALID_PARAMETER;
}
fseek(torrent_file,0L,SEEK_END);
bytes_not_parsed = ftell(torrent_file);
fseek(torrent_file,0L,SEEK_SET);
if(bytes_not_parsed < TORRENT_PARSER_PRESUME_TORRENT_MIN_LEN){
fclose(torrent_file);
free(parsing_buff);
return ERR_INCOMPLETE;
}
torrent->dst_encoding = (char *)malloc(strlen(dst_encoding)+1);
if(torrent->dst_encoding == NULL){
fclose(torrent_file);
free(parsing_buff);
return ERR_BAD_ALLOC;
}
else{
strcpy(torrent->dst_encoding,dst_encoding);
}
while (bytes_not_parsed > 0) {
read_len = bytes_not_parsed>=PARSING_BUFF_LEN?PARSING_BUFF_LEN:bytes_not_parsed;
bytes_not_parsed-=read_len;
result_len = fread(parsing_buff,1,read_len,torrent_file);
if(result_len!=read_len){
result = ERR_BAD_READ;
break;
}
result_len = parse_torrent_part(torrent,parsing_buff,read_len);
if(result_len < 0){
result = result_len;
break;
}
}
if (result == 0) {
result = tp_finish(torrent);
}
fclose(torrent_file);
free(parsing_buff);
return result;
}
int tp_finish(TorrentParser *torrent)
{
EncodingCvt ecv;
encoding_cvt_func_t tp_convert_encoding = NULL;
TorrentSubFileInfo *p_sub_file;
char *dst_buff;
uint32_t dst_len = MAX_PATH;
int32_t result;
if (torrent->parsing_related._p_item != NULL) {
return ERR_INVALID_PARAMETER;
}
if (torrent->_piece_hash_ptr == NULL
|| torrent->_title_name == NULL
|| torrent->_piece_length == 0) {
return ERR_INCOMPLETE;
}
if (torrent->_file_num == 0) {
p_sub_file = tp_find_incompleted_file(torrent);
if (p_sub_file == NULL) {
return ERR_BAD_ALLOC;
}
p_sub_file->_file_name = (char *)malloc(torrent->_title_name_len+1);
p_sub_file->_file_path = (char *)malloc(1);
if (p_sub_file->_file_name == NULL || p_sub_file->_file_path == NULL) {
return ERR_BAD_ALLOC;
} else {
p_sub_file->_file_size = torrent->_file_total_size;
memcpy(p_sub_file->_file_name, torrent->_title_name,
torrent->_title_name_len + 1);
p_sub_file->_file_name_len = torrent->_title_name_len;
p_sub_file->_file_path[0] = 0;
}
}
else
{
p_sub_file = torrent->_list_tail;
torrent->_file_total_size =
p_sub_file->_file_size + p_sub_file->_file_offset;
}
/* convert encoding */
if (torrent->src_encoding != NULL
&& stricmp(torrent->src_encoding,torrent->dst_encoding)==0){
return 0;
}
if(torrent->src_encoding == NULL){
if(stricmp(torrent->dst_encoding,UTF8_ENCODING)==0){
tp_convert_encoding = encoding_cvt_to_utf8;
}
else if(stricmp(torrent->dst_encoding,GBK_ENCODING)==0){
tp_convert_encoding = encoding_cvt_to_gbk;
}
else if(stricmp(torrent->dst_encoding,BIG5_ENCODING)==0){
tp_convert_encoding = encoding_cvt_to_big5;
}
}
else if(stricmp(torrent->src_encoding,UTF8_ENCODING)==0){
if(stricmp(torrent->dst_encoding,GBK_ENCODING)==0){
tp_convert_encoding = encoding_cvt_utf8_to_gbk;
}
else if(stricmp(torrent->dst_encoding,BIG5_ENCODING)==0){
tp_convert_encoding = encoding_cvt_utf8_to_big5;
}
}
else if(stricmp(torrent->src_encoding,GBK_ENCODING)==0){
if(stricmp(torrent->dst_encoding,UTF8_ENCODING)==0){
tp_convert_encoding = encoding_cvt_gbk_to_utf8;
}
else if(stricmp(torrent->dst_encoding,BIG5_ENCODING)==0){
tp_convert_encoding = encoding_cvt_gbk_to_big5;
}
}
else if(stricmp(torrent->src_encoding,BIG5_ENCODING)==0){
if(stricmp(torrent->dst_encoding,UTF8_ENCODING)==0){
tp_convert_encoding = encoding_cvt_big5_to_utf8;
}
else if(stricmp(torrent->dst_encoding,GBK_ENCODING)==0){
tp_convert_encoding = encoding_cvt_big5_to_gbk;
}
}
if(tp_convert_encoding == NULL) return 0;
encoding_cvt_initialize(&ecv);
dst_buff =(char *)alloca(dst_len);
//convert title name to destination encoding
result = tp_convert_encoding(&ecv, torrent->_title_name,torrent->_title_name_len,dst_buff,&dst_len);
if(result == 0){
torrent->_title_name = (char *)realloc(torrent->_title_name,dst_len+1);
memcpy(torrent->_title_name,dst_buff,dst_len);
torrent->_title_name_len = dst_len;
torrent->_title_name[torrent->_title_name_len] = '\0';
}
else{
//assert(0);
//break;
}
for(p_sub_file = torrent->_file_list;p_sub_file != NULL;p_sub_file = p_sub_file->_p_next){
if(p_sub_file->_file_path_len>0){
dst_len = MAX_PATH;
result = tp_convert_encoding(&ecv, p_sub_file->_file_path,p_sub_file->_file_path_len,dst_buff,&dst_len);
if(result == 0){
p_sub_file->_file_path = (char *)realloc(p_sub_file->_file_path, dst_len+1);
memcpy(p_sub_file->_file_path,dst_buff,dst_len);
p_sub_file->_file_path_len = dst_len;
p_sub_file->_file_path[p_sub_file->_file_path_len] = '\0';
}
else{
//assert(0);
//break;
}
}
//convert file name to destination encoding
dst_len = MAX_PATH;
result = tp_convert_encoding(&ecv, p_sub_file->_file_name,p_sub_file->_file_name_len,dst_buff,&dst_len);
if(result == 0){
p_sub_file->_file_name = (char *)realloc(p_sub_file->_file_name, dst_len+1);
memcpy(p_sub_file->_file_name,dst_buff,dst_len);
p_sub_file->_file_name_len = dst_len;
p_sub_file->_file_name[p_sub_file->_file_name_len] = '\0';
}
else{
//assert(0);
//break;
}
}
encoding_cvt_finalize(&ecv);
return 0; //result
}
/**
* prerequisites: p_torrent != NULL &&p_dict != NULL && p_dict->_key != NULL && p_dict->_item != NULL
*/
int tp_store_dict(TorrentParser *p_torrent, bencoding_dict* p_dict) {
const char* dict_key = p_dict->_key->_str;
bencoding_item_base *p_item = p_dict->_item;
int store_result = 0;
if (p_item->_type == BENCODING_ITEM_INTEGER
|| p_item->_type == BENCODING_ITEM_NEGINT) {
bencoding_int *p_int = (bencoding_int *) p_item;
if (p_dict->_base._p_parent == NULL)
{
if (strcmp(dict_key, "piece length") == 0) {
p_torrent->_piece_length = p_int->_value;
}
free(p_int);
p_dict->_item = NULL;
return 0;
}
//p_dict is not the root dictionary
if (p_dict->_base._p_parent->_type == BENCODING_ITEM_LIST) {
//p_dict's parent is a list
bencoding_list *p_list =
(bencoding_list *) p_dict->_base._p_parent;
if (p_list->_base._p_parent->_type == BENCODING_ITEM_DICT) {
//expecting p_list's parent is the dict referred by key "info" in the root dict
bencoding_dict *p_info_dict =
(bencoding_dict *) p_list->_base._p_parent;
if (strcmp(p_info_dict->_key->_str, "files") == 0) {
if (strcmp(dict_key, "length") == 0) {
TorrentSubFileInfo* p_file =
tp_find_incompleted_file(p_torrent);
if (p_file == NULL) {
store_result = -1;
} else {
p_file->_file_size = p_int->_value;
}
} else {
//ignore the item
}
} else {
//ignore the item.
}
} else {
store_result = -1;
}
}
else
{
//p_dict's parent is a BENCODING dictionary
if (strcmp(dict_key, "piece length") == 0) {
p_torrent->_piece_length = p_int->_value;
}
//expecting it's a single file torrent.
if (p_dict->_base._p_parent->_p_parent == NULL
&& strcmp(
((bencoding_dict *) p_dict->_base._p_parent)->_key->_str,
"info") == 0) {
if (strcmp(dict_key, "length") == 0) {
p_torrent->_file_total_size = p_int->_value;
}
}
}
free(p_int);
}
else if (p_item->_type == BENCODING_ITEM_STRING)
{
if (p_dict->_base._p_parent != NULL) {
bencoding_string *p_str = (bencoding_string *) p_item;
if (p_dict->_base._p_parent->_type == BENCODING_ITEM_LIST) {
free(p_str->_str);
} else {
//p_dict's parent is a bencoding dictionary
if (strcmp(dict_key, "name") == 0) {
p_torrent->_title_name = p_str->_str;
p_torrent->_title_name_len = p_str->_valid_len;
} else if (strcmp(dict_key, "pieces") == 0) {
p_torrent->_piece_hash_ptr = (uint8_t *) p_str->_str;
p_torrent->_piece_hash_len = p_str->_valid_len;
}
}
free(p_str);
}
else
{
bencoding_string *p_str = (bencoding_string *) p_item;
//p_dict is the root dict of the torrent
if (strcmp(dict_key, "announce") == 0) {
p_str->_base._p_next = NULL;
tp_add_announce(p_torrent, p_str);
p_str = NULL;
} else if (strcmp(dict_key, "encoding") == 0) {
p_torrent->src_encoding = p_str->_str;
p_str->_str = NULL;
} else {
}
if (p_str != NULL) {
if(p_str->_str!=NULL)free(p_str->_str);
free(p_str);
}
}
}
else
{
free(p_item);
}
free(p_dict->_key->_str);
free(p_dict->_key);
p_dict->_key = NULL;
p_dict->_item = NULL;
return store_result;
}
static int tp_store_path(TorrentParser *p_torrent, bencoding_list* p_list)
{
bencoding_string *p_str;
TorrentSubFileInfo *p_file;
int path_phase;
int path_len;
char *merged_path;
p_file = tp_find_incompleted_file(p_torrent);
if(p_file == NULL){
return -1;
}
p_str = (bencoding_string *) p_list->_item;
path_phase = 0;
path_len = 0;
while (p_str->_base._p_next != NULL) {
path_len += p_str->_valid_len;
++path_phase;
p_str = (bencoding_string *) p_str->_base._p_next;
}
//store file name
p_file->_file_name_len = p_str->_valid_len;
p_file->_file_name = p_str->_str;
p_str->_str = NULL;
if(path_phase == 0){
p_file->_file_path = (char *)malloc(1);
p_file->_file_path_len = 0;
p_file->_file_path[0] = '\0';
}
else if(path_phase == 1){
p_str = (bencoding_string *) p_list->_item;
p_file->_file_path = p_str->_str;
p_str->_str = NULL;
p_file->_file_path_len = p_str->_valid_len;
}
else{
merged_path = (char *)malloc(path_len + path_phase);
p_str = (bencoding_string *) p_list->_item;
path_len = 0;
while (p_str->_base._p_next != NULL)
{
memcpy(merged_path+path_len,p_str->_str,p_str->_valid_len);
path_len += p_str->_valid_len;
merged_path[path_len++] = '/';
p_str = (bencoding_string *) p_str->_base._p_next;
}
merged_path[--path_len]='\0';
p_file->_file_path = merged_path;
p_file->_file_path_len = path_len;
}
p_str = (bencoding_string *) p_list->_item;
while (p_str->_base._p_next != NULL) {
bencoding_string *p_del = p_str;
p_str = (bencoding_string *) p_str->_base._p_next;
if(p_del->_str != NULL){
free(p_del->_str);
}
free(p_del);
}
return 0;
}
int tp_store_list(TorrentParser *p_torrent, bencoding_list* p_list) {
int store_result = 0;
if (p_list->_base._p_parent->_type == BENCODING_ITEM_LIST)
{
bencoding_item_base *p_parent_list = p_list->_base._p_parent;
bencoding_dict *p_dict = (bencoding_dict *) p_parent_list->_p_parent;
if (p_parent_list->_p_parent->_type != BENCODING_ITEM_DICT
||p_parent_list->_p_parent->_p_parent != NULL)
{
bencoding_item_base *p_node = p_list->_item;
while (p_node != NULL)
{
bencoding_item_base *p_del = p_node;
p_node = p_node->_p_next;
if (p_del->_type == BENCODING_ITEM_STRING) {
free(((bencoding_string *) p_del)->_str);
}
free(p_del);
}
p_list->_item = NULL;
return -1;
}
if (strcmp(p_dict->_key->_str, "announce-list") == 0) {
bencoding_string *p_str = (bencoding_string *) p_list->_item;
p_str->_base._p_next = NULL;
tp_add_announce(p_torrent, p_str);
p_list->_item = NULL;
}
else
{
//dht nodes is possible here.
bencoding_item_base *p_node = p_list->_item;
while (p_node != NULL)
{
bencoding_item_base *p_del = p_node;
p_node = p_node->_p_next;
if (p_del->_type == BENCODING_ITEM_STRING) {
free(((bencoding_string *) p_del)->_str);
}
free(p_del);
}
p_list->_item = NULL;
}
}
else
{
//p_list's parent is a dictionary
bencoding_dict *p_dict = (bencoding_dict *) p_list->_base._p_parent;
//expecting path
if (p_dict->_base._p_parent != NULL
&& strcmp(p_dict->_key->_str, "path") == 0)
{
tp_store_path(p_torrent,(bencoding_list *)p_dict->_item);
}
else
{
bencoding_item_base *p_node = p_list->_item;
bencoding_item_base *p_del;
while (p_node != NULL) {
p_del = p_node;
p_node = p_node->_p_next;
if (p_del->_type == BENCODING_ITEM_STRING) {
free(((bencoding_string *) p_del)->_str);
}
free(p_del);
}
}
}
p_list->_item = NULL;
return store_result;
}
int parse_torrent_part(TorrentParser *p_torrent, const char * src,size_t len) {
bencoding_item_base* p_item = p_torrent->parsing_related._p_item;
size_t parse_cur = 0;
long long sha1_start = -1;
long long sha1_end = -1;
int parsing_result = 0; //1 stands for illegal char in integer
for (parse_cur = 0; parse_cur < len; ++parse_cur) {
const char input_char = src[parse_cur];
if (p_item == NULL) {
break;
}
else if (p_item->_type == BENCODING_ITEM_INTEGER || p_item->_type == BENCODING_ITEM_NEGINT)
{
bencoding_int *p_int = (bencoding_int *) p_item;
if (input_char >= '0' && input_char <= '9')
{
++p_int->_base._len;
p_int->_value = p_int->_value * 10 + input_char - '0';
}
else if (input_char == '-')
{
p_int->_base._type = BENCODING_ITEM_NEGINT;
}
else if (input_char == 'e')
{
if (p_item->_type == BENCODING_ITEM_NEGINT)
p_int->_value = 0 - p_int->_value;
p_item = p_item->_p_parent;
if (p_item->_type == BENCODING_ITEM_DICT) {
p_item->_state = dict_waiting_key;
}
}
else {
parsing_result = ERR_INVALID_PARAMETER;
break;
}
}
else if (p_item->_type == BENCODING_ITEM_STRING)
{
bencoding_string *p_str = (bencoding_string *) p_item;
if (p_item->_state == string_parsing_len)
{
if (input_char >= '0' && input_char <= '9')
{
p_item->_len = p_item->_len * 10 + input_char - '0';
}
else if (input_char == ':')
{
if (p_item->_len > BENCODING_STRING_MAX_LEN)
{
parsing_result = ERR_TOO_LONG;
break;
}
p_item->_state = string_parsing_buf;
p_str->_valid_len = 0;
p_str->_str = (char *)malloc(p_str->_base._len + 1);
if (p_str->_str == NULL)
{
parsing_result = ERR_BAD_ALLOC;
break;
}
}
else
{
parsing_result = ERR_INVALID_PARAMETER;
break;
}
}
else
{
long long copy_len = p_str->_base._len - p_str->_valid_len;
if (len - parse_cur >= copy_len) {
memcpy(p_str->_str + p_str->_valid_len, src + parse_cur,
copy_len);
p_str->_valid_len = p_str->_base._len;
parse_cur += copy_len - 1;
p_torrent->parsing_related._bytes_parsed += copy_len
- 1;
} else {
memcpy(p_str->_str + p_str->_valid_len, src + parse_cur,
len - parse_cur);
p_str->_valid_len += len - parse_cur;
parse_cur = len - 1;
p_torrent->parsing_related._bytes_parsed += len
- parse_cur - 1;
}
}
if (p_str->_valid_len == p_str->_base._len)
{
p_str->_base._state = string_parsing_buf;
p_str->_str[p_str->_valid_len] = '\0';
p_item = p_item->_p_parent;
if (p_item->_type == BENCODING_ITEM_DICT) {
p_item->_state =
(p_item->_state == dict_key_parsing) ?
dict_waiting_val : dict_waiting_key;
}
/***
* Check info hash location,the BENCODING dictionary referred
* by key "info" in the root dictionary of the torrent
*/
if (p_str->_valid_len == 4
&& p_str->_base._p_parent->_type == BENCODING_ITEM_DICT
&& p_str->_base._p_parent->_p_parent == NULL
&& strncmp("info", p_str->_str, 4) == 0) {
p_torrent->parsing_related._update_info_sha1 = 1;
sha1_start = parse_cur + 1;
}
}
}
else if (p_item->_type == BENCODING_ITEM_DICT)
{
if (p_item->_state == dict_waiting_key)
{
bencoding_dict *p_dict = (bencoding_dict *) p_item;
if (p_dict->_key != NULL)
{
tp_store_dict(p_torrent, p_dict);
}
if (input_char >= '0' && input_char <= '9')
{
bencoding_string *p_str = bencoding_string_create(p_item);
if (p_str == NULL) {
parsing_result = ERR_BAD_ALLOC;
break;
}
p_str->_base._len = input_char - '0';
p_dict->_base._state = dict_key_parsing;
p_dict->_key = p_str;
p_item = (bencoding_item_base *) p_str;
}
else if (input_char == 'e')
{
p_item = p_item->_p_parent;
if (p_item == NULL)
{
++parse_cur;
++p_torrent->parsing_related._bytes_parsed;
break;
}
else if (p_item->_type == BENCODING_ITEM_DICT)
{
p_item->_state = dict_waiting_key;
}
if (p_item != NULL && p_item->_p_parent == NULL
&& p_item->_type == BENCODING_ITEM_DICT
&& ((bencoding_dict *)p_item)->_item->_type == BENCODING_ITEM_DICT
&& strncmp("info", ((bencoding_dict *)p_item)->_key->_str, 4) == 0)
{
sha1_end = parse_cur + 1;
}
}
else
{
parsing_result = ERR_INVALID_PARAMETER;
break;
}
}
else if (p_item->_state == dict_waiting_val)
{
bencoding_dict *p_dict = (bencoding_dict *) p_item;
if (input_char >= '0' && input_char <= '9')
{
bencoding_string *p_str = bencoding_string_create(p_item);
if (p_str == NULL) {
parsing_result = ERR_BAD_ALLOC;
break;
}
p_str->_base._len = input_char - '0';
p_item->_state = dict_val_parsing;
p_dict->_item = (bencoding_item_base *) p_str;
p_item = (bencoding_item_base *) p_str;
}
else if (input_char == 'd')
{
bencoding_dict *p_new_dict = bencoding_dict_create(p_item);
if (p_new_dict == NULL) {
parsing_result = ERR_BAD_ALLOC;
break;
}
p_item->_state = dict_val_parsing;
((bencoding_dict *) p_item)->_item =
(bencoding_item_base *) p_new_dict;
p_item = (bencoding_item_base *) p_new_dict;
}
else if (input_char == 'l')
{
bencoding_list *p_list = bencoding_list_create(p_item);
if (p_list == NULL) {
parsing_result = ERR_BAD_ALLOC;
break;
}
p_item->_state = dict_val_parsing;
((bencoding_dict *) p_item)->_item =
(bencoding_item_base *) p_list;
p_item = (bencoding_item_base *) p_list;
}
else if (input_char == 'i')
{
bencoding_int *p_int = bencoding_integer_create(p_item);
if (p_int == NULL) {
parsing_result = ERR_BAD_ALLOC;
break;
}
p_item->_state = dict_val_parsing;
((bencoding_dict *) p_item)->_item =
(bencoding_item_base *) p_int;
p_item = (bencoding_item_base *) p_int;
}
else
{
parsing_result = ERR_INVALID_PARAMETER;
break;
}
}
else
{
//p_item->_state is HPTP_STATE_WAIT_DICT_FEATURE
if (input_char == 'd') {
p_item->_state = dict_waiting_key;
} else {
parsing_result = ERR_INVALID_PARAMETER;
break;
}
}
}
else if (p_item->_type == BENCODING_ITEM_LIST)
{
bencoding_list *p_list = (bencoding_list *) p_item;
if (p_list->_item != NULL
&& p_list->_item->_type != BENCODING_ITEM_STRING)
{
tp_store_list(p_torrent, p_list);
}
if (input_char >= '0' && input_char <= '9')
{
bencoding_string *p_str = bencoding_string_create(p_item);
if (p_str == NULL) {
parsing_result = ERR_BAD_ALLOC;
break;
}
p_str->_base._len = input_char - '0';
bencoding_list_add_item(p_list, (bencoding_item_base *) p_str);
p_item = (bencoding_item_base *) p_str;
}
else if (input_char == 'd')
{
bencoding_dict *p_dict = bencoding_dict_create(p_item);
if (p_dict == NULL) {
parsing_result = ERR_BAD_ALLOC;
break;
}
p_list->_item = (bencoding_item_base *) p_dict;
p_item = (bencoding_item_base *) p_dict;
}
else if (input_char == 'i')
{
bencoding_int *p_new = bencoding_integer_create(p_item);
if (p_new == NULL) {
parsing_result = ERR_BAD_ALLOC;
break;
}
bencoding_list_add_item(p_list, (bencoding_item_base *) p_new);
p_item = (bencoding_item_base *) p_new;
}
else if (input_char == 'l')
{
bencoding_list *p_new = bencoding_list_create(p_item);
if (p_new == NULL) {
parsing_result = ERR_BAD_ALLOC;
break;
}
p_list->_item = (bencoding_item_base *) p_new;
p_item = (bencoding_item_base *) p_new;
}
else if (input_char == 'e')
{
if (p_list->_item != NULL)
{
tp_store_list(p_torrent, p_list);
}
p_item = p_item->_p_parent;
if (p_item->_type == BENCODING_ITEM_DICT)
{
p_item->_state = dict_waiting_key;
}
}
else
{
parsing_result = ERR_INVALID_PARAMETER;
break;
}
}
++p_torrent->parsing_related._bytes_parsed;
}
p_torrent->parsing_related._p_item = p_item;
if (parsing_result == 0
&& p_torrent->parsing_related._update_info_sha1 == 1)
{
if (sha1_start >= 0 && sha1_end >= 0) {
sha1_update(&p_torrent->parsing_related._sha1_ctx,
(unsigned char *) src + sha1_start, sha1_end - sha1_start);
sha1_finish(&p_torrent->parsing_related._sha1_ctx,
p_torrent->_info_hash);
p_torrent->_info_hash_valid = 1;
} else if (sha1_start >= 0) {
sha1_update(&p_torrent->parsing_related._sha1_ctx,
(unsigned char *) src + sha1_start, len - sha1_start);
} else if (sha1_end >= 0) {
sha1_update(&p_torrent->parsing_related._sha1_ctx,
(unsigned char *) src, sha1_end);
sha1_finish(&p_torrent->parsing_related._sha1_ctx,
p_torrent->_info_hash);
p_torrent->_info_hash_valid = 1;
} else {
sha1_update(&p_torrent->parsing_related._sha1_ctx,
(unsigned char *) src, len);
}
}
return parse_cur;
}
/**
* return : null stands for error occurred
*/
TorrentSubFileInfo* tp_find_incompleted_file(TorrentParser* torrent) {
TorrentSubFileInfo *file = NULL;
if (torrent->_file_list == NULL) {
file = tp_torrent_referred_file_create(0);
if (file != NULL){
torrent->_list_tail = file;
torrent->_file_list = file;
++torrent->_file_num;
}
}
else if (torrent->_list_tail->_file_name == NULL
|| torrent->_list_tail->_file_path == NULL
|| torrent->_list_tail->_file_size == TORRENT_PARSER_INVALID_FILE_SIZE) {
file = torrent->_list_tail;
}
else
{
file = tp_torrent_referred_file_create(
torrent->_list_tail->_file_index + 1);
if (file != NULL) {
file->_file_offset = torrent->_list_tail->_file_offset
+ torrent->_list_tail->_file_size;
torrent->_list_tail->_p_next = file;
torrent->_list_tail = file;
++torrent->_file_num;
}
}
return file;
}
bencoding_int* bencoding_integer_create(bencoding_item_base *p_parent)
{
bencoding_int* p_int = (bencoding_int *)malloc(sizeof(bencoding_int));
if (p_int != NULL) {
p_int->_base._type = BENCODING_ITEM_INTEGER;
p_int->_base._p_parent = p_parent;
p_int->_value = 0;
p_int->_base._len = 0;
p_int->_base._p_next = NULL;
}
return p_int;
}
bencoding_string* bencoding_string_create(bencoding_item_base *p_parent)
{
bencoding_string* p_str = (bencoding_string *)malloc(sizeof(bencoding_string));
if (p_str != NULL) {
p_str->_base._type = BENCODING_ITEM_STRING;
p_str->_base._p_parent = p_parent;
p_str->_base._state = string_parsing_len;
p_str->_base._len = 0;
p_str->_str = NULL;
p_str->_valid_len = 0;
p_str->_base._p_next = NULL;
}
return p_str;
}
bencoding_list* bencoding_list_create(bencoding_item_base *p_parent)
{
bencoding_list* p_list = (bencoding_list *)malloc(sizeof(bencoding_list));
if (p_list != NULL) {
p_list->_base._type = BENCODING_ITEM_LIST;
p_list->_base._p_parent = p_parent;
p_list->_base._len = 0;
p_list->_item = NULL;
p_list->_base._p_next = NULL;
}
return p_list;
}
bencoding_dict* bencoding_dict_create(bencoding_item_base *p_parent)
{
bencoding_dict* p_dict = (bencoding_dict *)malloc(sizeof(bencoding_dict));
if (p_dict != NULL) {
p_dict->_base._type = BENCODING_ITEM_DICT;
p_dict->_base._p_parent = p_parent;
p_dict->_base._state = dict_waiting_key;
p_dict->_base._len = 0;
p_dict->_key = NULL;
p_dict->_item = NULL;
p_dict->_base._p_next = NULL;
}
return p_dict;
}
void bencoding_string_destroy(bencoding_string *p_str) {
if (p_str->_str != NULL) {
free(p_str->_str);
}
free(p_str);
}
void bencoding_list_destroy(bencoding_list *p_list)
{
bencoding_item_base *p_node = p_list->_item;