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vfo_cgi.c
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vfo_cgi.c
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/*
* This file is part of webcam.
*
* Copyright (c) 2013 Aleksander Mazur
*
* webcam is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* webcam is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with webcam. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include "vfo_cgi.h"
/**
* @addtogroup vfo_cgi
* @{
*/
/**************************************/
/** Instance of a CGI output. */
typedef struct {
video_frame_output_t base; /**< Base structure. */
FILE *output; /**< Destination file. */
char boundary[32]; /**< Boundary separating parts of multipart/x-mixed-replace MIME type. */
int boundary_started; /**< Whether the boundary has been already emitted to the output. */
} video_frame_output_cgi_t;
/**************************************/
/** @copydoc video_frame_output_ops_t::PutFrame */
static void video_frame_output_cgi_PutFrame(video_frame_output_t *base, video_frame_filter_t *filter)
{
video_frame_output_cgi_t *thiz = (video_frame_output_cgi_t *) base;
int ok;
if (!thiz->boundary_started) {
fprintf(thiz->output, "--%s\r\n", thiz->boundary);
thiz->boundary_started++;
}
fprintf(thiz->output,
"Content-type: image/jpeg\r\n"
"Content-length: %tu\r\n"
"\r\n",
filter->op->GetSize(filter));
for (ok = 1; ok;) {
const unsigned char *buffer;
size_t size;
filter->op->Read(filter, &buffer, &size);
if (size) {
size_t written = 0;
while (written < size) {
int once = fwrite(buffer + written, 1, size - written, thiz->output);
if (once <= 0) {
perror("fwrite");
return;
}
written += once;
}
if (written != size) {
ok = 0;
}
} else {
break;
}
}
if (ok) {
fprintf(thiz->output, "\n--%s\r\n", thiz->boundary);
} else {
fprintf(thiz->output, "\n--%s--\r\n", thiz->boundary);
}
fflush(thiz->output);
}
/** @copydoc video_frame_output_ops_t::Destroy */
static void video_frame_output_cgi_Destroy(video_frame_output_t *base)
{
video_frame_output_cgi_t *thiz = (video_frame_output_cgi_t *) base;
fclose(thiz->output);
free(thiz);
}
/** Operations of the CGI output. */
video_frame_output_ops_t video_frame_output_cgi_ops = {
.PutFrame = video_frame_output_cgi_PutFrame,
.Destroy = video_frame_output_cgi_Destroy,
};
/**************************************/
video_frame_output_t *video_frame_output_cgi_init(FILE *output)
{
video_frame_output_cgi_t *rv = (video_frame_output_cgi_t *) calloc(1, sizeof(video_frame_output_cgi_t));
size_t i;
rv->base.op = &video_frame_output_cgi_ops;
rv->output = output;
for (i = 0; i < sizeof(rv->boundary) - 1; i++) {
int x = rand() % ('9' - '0' + 1 + 'z' - 'a' + 1);
int c;
if (x <= 9)
c = x + '0';
else
c = x - 10 + 'a';
rv->boundary[i] = c;
}
rv->boundary[sizeof(rv->boundary) - 1] = 0;
rv->boundary_started = 0;
fprintf(output,
"HTTP/1.0 200 OK\r\n"
"Connection: close\r\n"
"Server: OLO Webcam CGI v1.2\r\n"
"Pragma: no-cache\r\n"
"Content-type: multipart/x-mixed-replace; boundary=%s\r\n"
"\r\n",
rv->boundary);
return &rv->base;
}
/**
* @}
*/