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【C】编码转换
作者:Dezai.CN / 发布于2011/2/10/ 589
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/types.h></div>
<div>define BUFSIZE 256</div>
<div>typedef enum BType {
Nothing = 0,
BString,
BInt,
BList,
BDict
} BType;</div>
<div>struct Bencoding;</div>
<div>typedef struct ListNode {
struct Bencoding *cargo;
struct ListNode *next;
} ListNode;</div>
<div>typedef struct DictNode {
char *key;
struct Bencoding *value;
struct DictNode *next;
} DictNode;</div>
<div>typedef struct Bencoding {
BType type;
union {
long long val; // used when type == BInt
ListNode *list; // used when type == BList
char *str; // used when type == BString
DictNode *dict;
} cargo; // data
} Bencoding;</div>
<div>Bencoding* parse_bencoding();</div>
<div>Bencoding* new_bencoding()
{
return malloc(sizeof(Bencoding));
}
<div>ListNode* new_listnode()
{
return malloc(sizeof(ListNode));
}
<div>DictNode* new_dictnode()
{
return malloc(sizeof(DictNode));
}
<div>Bencoding* new_bint(int val)
{
Bencoding *b = new_bencoding();
b->type = BInt;
b->cargo.val = val;
return b;
}
<div>Bencoding* new_blist(ListNode *l)
{
Bencoding *b = new_bencoding();
b->type = BList;
b->cargo.list = l;
return b;
}
<div>Bencoding* new_bstring(char *s, int len)
{
Bencoding *b = new_bencoding();
b->type = BString;
b->cargo.str = s;
return b;
}
<div>Bencoding* new_bdict(DictNode *d)
{
Bencoding *b = new_bencoding();
b->type = BDict;
b->cargo.dict = d;
return b;
}
<div>void failed()
{
printf("Parse FAILED\n");
exit(1);
}
<div>char buf[BUFSIZE];
int pos = 0;
int buf_lim = 0;</div>
<div>char reloadBuffer() 
{ 
buf_lim = fread(buf, 1, BUFSIZE, stdin);
pos = 0;
}
<div>void checkBufReady()
{
if (pos >= buf_lim)
reloadBuffer();
}
<div>char peekChar()
{
checkBufReady();
return buf[pos];
}
<div>char getChar()
{
checkBufReady();
return buf[pos++];
}
<div>void matchChar(char c)
{
if (getChar() != c)
failed();
}
<div>Bencoding* parse_int() 
{
matchChar('i');
long long val = 0;
while (isdigit(peekChar()))
val = val*10 + (getChar() - '0');
matchChar('e');</div>
<div>return new_bint(val);
}
<div>Bencoding* parse_list()
{
matchChar('l');
ListNode l;
ListNode *c = &l;
while (peekChar() != 'e') {
c->next = new_listnode();
c = c->next;
c->cargo = parse_bencoding();
c->next = 0;
}
matchChar('e');
return new_blist(l.next);
}
<div>Bencoding* parse_string()
{
int len = 0;
while (isdigit(peekChar()))
len = len*10 + (getChar() - '0');
matchChar(':');
char *s = malloc(sizeof(char)*(len+1));
int i;
for (i = 0; i < len; ++i)
s[i] = getChar();
s[len] = 0;
return new_bstring(s, len+1);
}
<div>Bencoding* parse_dict()
{
matchChar('d');
DictNode d;
DictNode *c = &d;
while (peekChar() != 'e') {
c->next = new_dictnode();
c = c->next;
Bencoding *s = parse_string();
c->key = s->cargo.str;
free(s);
c->value = parse_bencoding();
c->next = 0;
}
matchChar('e');
return new_bdict(d.next);
}
<div>Bencoding* parse_bencoding()
{
char c = peekChar();
switch (c) {
case 'd': return parse_dict();
case 'l': return parse_list();
case 'i': return parse_int();
default: return parse_string();
}
}
<div>void print_indent(int indent)
{
int i;
for (i = 0; i < indent; ++i)
printf(" ");
}
<div>
void print_bencoding(Bencoding *b, int indent)
{
print_indent(indent);
switch (b->type) {
case BInt: 
printf("%lld\n", b->cargo.val);
break;
case BList:
printf("[\n");
ListNode *c = b->cargo.list;
while (c) {
print_bencoding(c->cargo, indent+1);
c = c->next;
}
print_indent(indent);
printf("]\n");
break;
case BString:
printf("%s\n", b->cargo.str);
break;
case BDict:
printf("{\n");
DictNode *d = b->cargo.dict;
while (d) {
print_indent(indent+1);
printf("%s ==>\n", d->key);
print_bencoding(d->value, indent+2);
d = d->next;
}
print_indent(indent);
printf("}\n");
break;
}
}
<div>int main(int argc, char *argv[])
{
Bencoding* b = parse_bencoding();</div>
<div>print_bencoding(b, 0);</div>
<div>return 0;
}
</div>
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