httpio

Cross Platform parser and response generator for the HTTP protocol.

Library has the simple API to embed to the custom systems.

Parser functions:

Parses the HTTP stream on the fly
Does not use the dynamic allocation (uses predefined connection buffer as the simple pool)
Not used space of the connection buffer can be used as the network receiving buffer
Supports the keep-alive multiple requests and various types of POST request

Generator functions:

As well as the parser it does not use the dynamic allocation
Organized by a ring buffer
Supports the chunked transfer encoding

Parser example (stdin instead the socket)

#include <stdio.h>
#include "httpio.h"

static char in_pool[1024];

int main(int argc, const char **argv)
{
    FILE *f;
    httpi_t *in;
    f = argc == 2 ? fopen(argv[1], "rb") : stdin;
    in = httpi_init(in_pool, 1024);
    while (1)
    {
        int size;
        char *data;
        int status = httpi_pull(in);
        switch (status)
        {
        case HTTP_IN_NODATA:
            /* data input */
            httpi_get_state(in, &data, &size);
            size = fread(data, 1, size, f);
            httpi_push(in, data, size);
            if (size == 0) return 0;
            continue;
        case HTTP_IN_REQUEST:
            printf("page %s requested\n", httpi_request(in)->uri);
            continue;
        case HTTP_IN_POSTDATA:
            printf("new chunk of POST data \"%s\"\n", httpi_posted(in)->name);
            continue;
        case HTTP_IN_FINISHED:
            printf("request finished\n");
            continue;
        default:
            printf("invalid request!\n");
            return 0;
        }
    }
}

Example input:

POST /cgi-bin/login.cgi HTTP/1.1
Host: www.tutorialspoint.com
Content-Type: application/x-www-form-urlencoded
Content-Length: 35
Accept-Language: en-us
Accept-Encoding: gzip, deflate
Connection: Keep-Alive

login=Petya%20Vasechkin&password=qq

Example output:

page /cgi-bin/login.cgi requested
new chunk of POST data "login"
new chunk of POST data "password"
request finished

Response generator example (stdout instead the socket)

#include <stdio.h>
#include "httpio.h"

static char out_pool[1024];

int main(int argc, const char **argv)
{
    FILE *f;
    httpo_t *out;
    http_resp_t resp;
    char *data;
    int size;
    out = httpo_init(out_pool, 1024);
    http_resp_init(&resp, 200, MIME_TEXT_HTML, RESPF_KEEPALIVE | RESPF_CHUNKED | RESPF_NOCACH);
    httpo_write_resp(out, &resp);
    httpo_write_data(out, "first data chunk", 16);
    httpo_write_data(out, "the second data chunk", 21);
    httpo_finished(out);
    httpo_state(out, &data, &size);
    fwrite(data, 1, size, stdout);
    return 0;
}

Example output:

HTTP/1.1 200 OK
Content-Language: en
Content-Type: text/html
Connection: keep-alive
Cache-Control: no-store, no-cache
Transfer-Encoding: chunked

10
first data chunk
15
the second data chunk
0

fetisov/httpio

httpio

Parser example (stdin instead the socket)

Response generator example (stdout instead the socket)