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