httpencode.cpp

linux系统下bt的客户端实现。 采用的是c++

#include "Httpencode.h"
#include <sys/types.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <stdio.h>

static char *strnstr(const char *haystack, const char *needle,
					 size_t haystacklen)
{
	char *p;
	size_t plen, len;

	if (*needle == '\0')
		return (char *) haystack;

	len = strlen(needle);

	plen = haystacklen;
	for (p = (char *) haystack; p != (char *) 0;
		 p = (char *) memchr(p + 1, *needle, plen - 1)) {
		plen = haystacklen - (p - haystack);
		if (plen < len)
			return (char *) 0;

		if (strncmp(p, needle, len) == 0)
			return (char *) p;
	}
	return (char *) 0;
}




static void url_encode_char(char *b, char c)
{
	char HEX_TABLE[] = "0123456789ABCDEF";

	b[0] = '%';
	b[1] = HEX_TABLE[(c >> 4) & 0x0F];
	b[2] = HEX_TABLE[c & 0x0F];
}

char *Http_url_encode(char *s, char *b, size_t n)
{
	size_t r, i;
	for (r = 0, i = 0; i < n; i++) {
		if (isalpha(b[i]) || isdigit(b[i])) {
			s[r] = b[i];
			r++;
		} else {
			url_encode_char(s + r, b[i]);
			r += 3;
		}
	}

	s[r] = '\0';
	return s;
}

int Http_url_analyse(char *url, char *host, int *port, char *path)
{
	char *p;
	int r;
	*port = 80;


	if (NULL == (p = strstr(url, "://")))
		p = url;
	else
		p += 3;

	for (; *p && (isalnum(*p) || *p == '.' || *p == '-'); p++, host++)
		*host = *p;
	*host = '\0';

	if (':' == *p) {
		p++;
		for (r = 0; p[r] >= '0' && p[r] <= '9' && r < 6; r++);

		if (!r)
			return -1;
		*port = atoi(p);
		if (*port > 65536)
			return -1;
		p += r;
	}
	if (*p != '/')
		return -1;
	for (; *p; p++, path++)
		*path = *p;
	*path = '\0';
	return 0;
}

size_t Http_split(char *b, size_t n, char **pd, size_t * dlen)
{
	char *p;
	size_t addtion, hlen;
	addtion = 2;
	hlen = 0;

	if (n < 16)
		return 0;

	if (strncasecmp(b, "HTTP/", 5) != 0) {
		return 0;
	}

	p = strnstr(b, "\n\n", n);

	if (!p) {
		p = strnstr(b, "\r\n\r\n", n);
		if (p)
			addtion = 4;
	}

	if (p) {
		*pd = p + addtion;
		hlen = p - b;
		*dlen = n - hlen - addtion;
	} else {
		hlen = n;
		*pd = NULL;
		*dlen = 0;
	}

	return hlen;
}

int Http_reponse_code(char *b, size_t n)
{
	int r = -1;

	for (; n && *b != ' ' && *b != '\n'; b++, n--);

	if (!n || *b != ' ')
		r = -1;
	else {
		r = atoi(b);
		if (r < 100 || r > 600)
			r = -1;
	}
	return r;
}

int Http_get_header(const char *b, int n, char *header, char *v)
{
	char *e, h[64];
	int r, header_len;

	strcpy(h, header);
	strcat(h, ":");

	header_len = strlen(h);

	e = strchr(b, '\n');
	if (!e)
		return -1;
	e++;
	n -= (e - b);
	b = e;

	for (; n >= 0;) {
		e = strchr(b, '\n');
		if (!e)
			r = n;
		else {
			r = e - b;
			r++;
		}
		if (r > header_len) {
			if (strncasecmp(b, h, header_len) == 0) {
				b += header_len;
				for (; *b != '\n'; b++, v++)
					*v = *b;
				*v = '\0';
				return 0;
			}
		}

		n -= r;
		b += r;

	}
	return -1;
}