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/*!***************************************************************************
*! FILE NAME : imgsrv.c
*! DESCRIPTION: Simple and fast HTTP server to send camera still images
*! Copyright (C) 2007-2008 Elphel, Inc.
*! -----------------------------------------------------------------------------**
*! This program 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.
*!
*! This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*! -----------------------------------------------------------------------------**
*!
*! $Log: imgsrv.c,v $
*! Revision 1.4 2009/10/12 19:20:23 elphel
*! Added "Content-Disposition" support to suggest filenames to save images
*!
*! Revision 1.3 2009/02/25 17:47:51 spectr_rain
*! removed deprecated dependency
*!
*! Revision 1.2 2009/02/18 06:25:41 elphel
*! fixed unterminated string of 1 character (GPS mode - 2/3)
*!
*! Revision 1.1.1.1 2008/11/27 20:04:01 elphel
*!
*!
*! Revision 1.11 2008/11/03 18:42:21 elphel
*! comment typo
*!
*! Revision 1.10 2008/10/29 04:18:28 elphel
*! v.8.0.alpha10 made a separate structure for global parameters (not related to particular frames in a frame queue)
*!
*! Revision 1.9 2008/10/25 19:51:40 elphel
*! updated copyright year
*!
*! Revision 1.8 2008/10/21 21:28:52 elphel
*! support for xml meta output
*!
*! Revision 1.7 2008/10/13 16:55:53 elphel
*! removed (some) obsolete P_* parameters, renamed CIRCLSEEK to LSEEK_CIRC constants (same as other similar)
*!
*! Revision 1.6 2008/10/11 18:46:07 elphel
*! snapshot
*!
*! Revision 1.5 2008/10/06 08:31:08 elphel
*! snapshot, first images
*!
*! Revision 1.4 2008/09/07 19:48:08 elphel
*! snapshot
*!
*! Revision 1.3 2008/08/11 19:10:45 elphel
*! reduced syntax "complaints" from KDevelop
*!
*! Revision 1.2 2008/05/16 06:06:54 elphel
*! supporting variable JPEG header length
*!
*! Revision 1.14 2008/04/22 22:14:56 elphel
*! Added malloc failures handling, syslog logging of such events
*!
*! Revision 1.13 2008/04/16 20:30:33 elphel
*! added optional fps reduction to multipart JPEGs
*!
*! Revision 1.11 2008/04/07 09:13:35 elphel
*! Changes related to new Exif generation/processing
*!
*! Revision 1.10 2008/03/22 04:39:53 elphel
*! remove complaints about "&_time=..."
*!
*! Revision 1.9 2007/12/03 08:28:45 elphel
*! Multiple changes, mostly cleanup
*!
*! Revision 1.8 2007/11/16 08:56:19 elphel
*! Added support for 2 additional commands to check circbuf usage
*!
*! Revision 1.7 2007/11/04 23:25:16 elphel
*! removed extra (used during debug) munmap that caused segfault after sending "img" (so no /nxt/save)
*!
*! Revision 1.6 2007/11/04 05:47:40 elphel
*! Cleaned up from debug code inserted to fight mmap/caching bug (fixed by now)
*!
*! Revision 1.5 2007/11/01 18:59:37 elphel
*! debugging mmap/caching problems
*!
*! Revision 1.4 2007/10/30 16:56:06 elphel
*! release 7.1.4.5 - working on "can not find 0xffff in frame parameters" bug. Temporary fix
*!
*! Revision 1.3 2007/10/27 00:55:32 elphel
*! untested revision - need to go
*!
*! Revision 1.2 2007/10/11 06:42:28 elphel
*! Fixed bug - /meta command should return trivial xml file, not 1x1 pixel gif
*!
*! Revision 1.1.1.1 2007/10/02 19:44:54 elphel
*! This is a fresh tree based on elphel353-2.10
*!
*! Revision 1.4 2007/10/02 19:44:54 elphel
*! More functionality (buffer manipulation commands, clean interface, xml responces)
*!
*! Revision 1.3 2007/09/29 16:21:25 elphel
*! removed IOCTL usage from /dev/circbuf, improved comments, other minor changes
*!
*! Revision 1.2 2007/09/25 23:35:16 elphel
*! added Exif initialization, made it to work in background mode
*!
*! Revision 1.1 2007/09/23 06:49:10 elphel
*! Simple web server designed for particular task - serving camera JPEG images. It is faster, than through any of the web servers tested. Only some of the functionality is implemented (no Exif yet, no synchronization with the camera)
*!
*!
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
//#include <ctype.h>
//#include <getopt.h>
#include <time.h>
#include <string.h>
#include <syslog.h>
#include <netinet/in.h>
#include <sys/mman.h> /* mmap */
#include <sys/ioctl.h>
#include <asm/elphel/c313a.h>
#include <asm/elphel/exifa.h>
#include <asm/byteorder.h>
#if ELPHEL_DEBUG
#define ELPHEL_DEBUG_THIS 0
#else
#define ELPHEL_DEBUG_THIS 0
#endif
#if ELPHEL_DEBUG_THIS
#define D(x) fprintf(stderr,"%s:%d:%s: ",__FILE__,__LINE__,__FUNCTION__);x
#else
#define D(x)
#endif
//#define USEHTTP10(x)
#define USEHTTP10(x) x
// HEADER_SIZE is defined to be larger than actual header (later - with EXIF) to use compile-time buffer
//#define JPEG_HEADER_SIZE 0x26f // will not change
#define JPEG_HEADER_MAXSIZE 0x300 // will not change
#define TRAILER_SIZE 0x02
#define MAP_OPTIONS MAP_FILE|MAP_PRIVATE
//#define GLOBALPARS(x) globalPars[(x)-FRAMEPAR_GLOBALS] // should work in drivers and application
unsigned long * ccam_dma_buf; /* mmapped array */
char trailer[TRAILER_SIZE] = {0xff,0xd9};
const char url_args[]="This server supports sequence of commands entered in the URL (separated by \"/\", case sensitive )\n"
"executing them from left to right as they appear in the URL\n"
"img - send image at the current pointer (if it is first command - use last acquired image, if none availabe - send 1x1 gif)\n"
"bimg - same as above, but save the whole image in the memory before sending - useful to avoid overruns with slow connection \n"
"simg, sbimg - similar to img, bimg but will imemdiately suggest to save instead of opening image in the browser\n"
"mimg[n] - send images as a multipart JPEG (all commands after will be ignored), possible to specify optional fps reduction\n"
" i.e. mimg4 - skip 3 frames for each frame output (1/4 fps) \n"
"bmimg[n] - same as above, buffered\n"
"pointers - send XML-formatted data about frames available in the camera circular buffer)\n\n"
"Any of the 5 commands above can appear only once in the URL string, the second instance will be ignored. If none of the 5\n"
"are present in the URL 1x1 pixel gif will be returned to the client after executing the URL command.\n\n"
"torp - set frame pointer to global read pointer, maintained by the camera driver. If frame at that pointer\n"
" is invalid, use scnd (see below)\n"
"towp - set frame pointer to hardware write pointer - position where next frame will be aquired\n"
"prev - move to previous frame in buffer, nop if there are none\n"
"next - move to the next frame in buffer (will stop at write pointer, see towp above)\n"
"last - move to the most recently acquired frame, or to write pointer if there are none.\n"
" this command is implied at the start of the url command sequence.\n"
"first - move to the oldest frame still available in the buffer. It is not safe to rely on it if\n"
" more frames are expected - data might be overwritten at any moment and the output will be corrupted.\n"
"second - move to the second oldest frame in the buffer - somewhat safer than \"first\" - there will be time for\n"
" \"next\" command at least before frame data (and pointer structures) will be overwritten.\n"
"save - save current frame pointer as a global read pointer that holds it values between server requests.\n"
" This pointer is shared between all the clients and applications that use it.\n"
"wait - Wait until there will be a frame at current pointer ready\n";
//int sendImage(int bufferImageData, int fd_circ, int use_Exif);
int sendImage(int bufferImageData, int fd_circ, int use_Exif, int saveImage);
void sendBuffer(void * buffer, int len);
void listener_loop(int port);
void errorMsgXML(char * msg);
int framePointersXML(int fd_circ);
int metaXML(int fd_circ, int mode); /// mode: 0 - new (send headers), 1 - continue, 2 - finish
int printExifXML(int exif_page);
int out1x1gif(void);
#define saferead255(f,d,l) read(f,d,((l)<256)?(l):255)
int printExifXML(int exif_page) {
int indx;
long numfields=0;
struct exif_dir_table_t dir_table_entry;
int fd_exifdir;
struct exif_dir_table_t exif_dir[ExifKmlNumber] ; /// store locations of the fields needed for KML generations in the Exif block
/// Create Exif directory
/// Read the size of the Exif data
fd_exifdir = open(EXIFDIR_DEV_NAME, O_RDONLY);
if (fd_exifdir <0) {
printf ("<error>\"Opening %s\"</error>\n",EXIFDIR_DEV_NAME);
return -2 ; /// Error opening Exif directory
}
for (indx=0; indx<ExifKmlNumber; indx++) exif_dir[indx].ltag=0;
while (read(fd_exifdir, &dir_table_entry, sizeof(dir_table_entry))>0) {
switch (dir_table_entry.ltag) {
case Exif_Image_ImageDescription: indx= Exif_Image_ImageDescription_Index; break;
case Exif_Image_FrameNumber: indx= Exif_Image_FrameNumber_Index; break;
case Exif_Photo_DateTimeOriginal: indx= Exif_Photo_DateTimeOriginal_Index; break;
case Exif_Photo_SubSecTimeOriginal: indx= Exif_Photo_SubSecTimeOriginal_Index; break;
case Exif_Photo_ExposureTime: indx= Exif_Photo_ExposureTime_Index; break;
case Exif_GPSInfo_GPSLatitudeRef: indx= Exif_GPSInfo_GPSLatitudeRef_Index; break;
case Exif_GPSInfo_GPSLatitude: indx= Exif_GPSInfo_GPSLatitude_Index ; break;
case Exif_GPSInfo_GPSLongitudeRef: indx= Exif_GPSInfo_GPSLongitudeRef_Index ; break;
case Exif_GPSInfo_GPSLongitude: indx= Exif_GPSInfo_GPSLongitude_Index; break;
case Exif_GPSInfo_GPSAltitudeRef: indx= Exif_GPSInfo_GPSAltitudeRef_Index; break;
case Exif_GPSInfo_GPSAltitude: indx= Exif_GPSInfo_GPSAltitude_Index; break;
case Exif_GPSInfo_GPSTimeStamp: indx= Exif_GPSInfo_GPSTimeStamp_Index; break;
case Exif_GPSInfo_GPSDateStamp: indx= Exif_GPSInfo_GPSDateStamp_Index; break;
case Exif_GPSInfo_GPSMeasureMode: indx= Exif_GPSInfo_GPSMeasureMode_Index; break;
case Exif_GPSInfo_CompassDirectionRef: indx= Exif_GPSInfo_CompassDirectionRef_Index; break;
case Exif_GPSInfo_CompassDirection: indx= Exif_GPSInfo_CompassDirection_Index; break;
case Exif_GPSInfo_CompassPitchRef: indx= Exif_GPSInfo_CompassPitchRef_Index; break;
case Exif_GPSInfo_CompassPitch: indx= Exif_GPSInfo_CompassPitch_Index; break;
case Exif_GPSInfo_CompassRollRef: indx= Exif_GPSInfo_CompassRollRef_Index; break;
case Exif_GPSInfo_CompassRoll: indx= Exif_GPSInfo_CompassRoll_Index; break;
default: indx=-1;
}
if (indx>=0) {
memcpy(&(exif_dir[indx]),&dir_table_entry,sizeof(dir_table_entry));
numfields++;
}
}
close (fd_exifdir);
/// Create XML files iteslf
long rational3[6];
long exif_page_start;
char val[256];
int hours=0, minutes=0;
double seconds=0.0;
double longitude=0.0, latitude=0.0, altitude=0.0, heading=0.0, roll=0.0, pitch=0.0, exposure=0.0;
val[255]='\0';
int fd_exif= open(EXIF_DEV_NAME, O_RDONLY);
if (fd_exif <0) {
printf ("<error>\"Opening %s\"</error>\n",EXIF_DEV_NAME);
return -3 ;
}
exif_page_start= lseek (fd_exif, exif_page, SEEK_END); /// select specified Exif page
if (exif_page_start<0) {
printf ("<error>\"Exif page (%d) is out of range\"</error>\n",exif_page);
close (fd_exif);
return -1 ; /// Error opening Exif
}
///Image Description
if (exif_dir[Exif_Image_ImageDescription_Index].ltag==Exif_Image_ImageDescription) { // Exif_Image_ImageDescription is present in template
lseek (fd_exif,
exif_page_start+exif_dir[Exif_Image_ImageDescription_Index].dst,
SEEK_SET);
saferead255(fd_exif, val, exif_dir[Exif_Image_ImageDescription_Index].len);
printf("<ImageDescription>\"%s\"</ImageDescription>\n",val);
}
///Exif_Image_FrameNumber_Index 0x13
if (exif_dir[Exif_Image_FrameNumber_Index].ltag==Exif_Image_FrameNumber) { // Exif_Image_FrameNumber_Index is present in template
lseek (fd_exif,
exif_page_start+exif_dir[Exif_Image_FrameNumber_Index].dst,
SEEK_SET);
read(fd_exif, rational3, 4);
sprintf (val,"%ld", (long) __cpu_to_be32( rational3[0]));
printf("<FrameNumber>\"%s\"</FrameNumber>\n",val);
}
///DateTimeOriginal (with subseconds)
if (exif_dir[Exif_Photo_DateTimeOriginal_Index].ltag==Exif_Photo_DateTimeOriginal) {
lseek (fd_exif,
exif_page_start+exif_dir[Exif_Photo_DateTimeOriginal_Index].dst,
SEEK_SET);
read(fd_exif, val, 19);
val[19]='\0';
if (exif_dir[Exif_Photo_SubSecTimeOriginal_Index].ltag==Exif_Photo_SubSecTimeOriginal) {
val[19]='.';
lseek (fd_exif,
exif_page_start+exif_dir[Exif_Photo_SubSecTimeOriginal_Index].dst,
SEEK_SET);
read(fd_exif, &val[20], 7);
val[27]='\0';
}
printf("<DateTimeOriginal>\"%s\"</DateTimeOriginal>\n",val);
}
///Exif_Photo_ExposureTime
if (exif_dir[Exif_Photo_ExposureTime_Index].ltag==Exif_Photo_ExposureTime) { // Exif_Photo_ExposureTime is present in template
lseek (fd_exif,
exif_page_start+exif_dir[Exif_Photo_ExposureTime_Index].dst,
SEEK_SET);
read(fd_exif, rational3, 8);
exposure=(1.0*__cpu_to_be32( rational3[0]))/__cpu_to_be32( rational3[1]);
sprintf (val,"%f",exposure);
printf("<ExposureTime>\"%s\"</ExposureTime>\n",val);
}
/// GPS measure mode
if (exif_dir[Exif_GPSInfo_GPSMeasureMode_Index].ltag==Exif_GPSInfo_GPSMeasureMode) {
lseek (fd_exif,
exif_page_start+exif_dir[Exif_GPSInfo_GPSMeasureMode_Index].dst,
SEEK_SET);
read(fd_exif, val, 1);
val[1]='\0';
printf("<GPSMeasureMode>\"%s\"</GPSMeasureMode>\n",val);
}
///GPS date/time
if (exif_dir[Exif_GPSInfo_GPSDateStamp_Index].ltag==Exif_GPSInfo_GPSDateStamp) {
lseek (fd_exif,
exif_page_start+exif_dir[Exif_GPSInfo_GPSDateStamp_Index].dst,
SEEK_SET);
read(fd_exif, val, 10);
val[10]='\0';
if (exif_dir[Exif_GPSInfo_GPSTimeStamp_Index].ltag==Exif_GPSInfo_GPSTimeStamp) {
lseek (fd_exif,
exif_page_start+exif_dir[Exif_GPSInfo_GPSTimeStamp_Index].dst,
SEEK_SET);
read(fd_exif, rational3, 24);
hours= __cpu_to_be32( rational3[0]);
minutes= __cpu_to_be32( rational3[2]);
seconds= (1.0*(__cpu_to_be32( rational3[4])+1))/__cpu_to_be32( rational3[5]); /// GPS likes ".999", let's inc by one - anyway will round that out
sprintf (&val[10]," %02d:%02d:%05.2f",hours,minutes,seconds);
}
printf("<GPSDateTime>\"%s\"</GPSDateTime>\n",val);
}
/// knowing format provided from GPS - degrees and minutes only, no seconds:
///GPS Longitude
if (exif_dir[Exif_GPSInfo_GPSLongitude_Index].ltag==Exif_GPSInfo_GPSLongitude) { // Exif_GPSInfo_GPSLongitude is present in template
lseek (fd_exif,
exif_page_start+exif_dir[Exif_GPSInfo_GPSLongitude_Index].dst,
SEEK_SET);
read(fd_exif, rational3, 24);
longitude=__cpu_to_be32( rational3[0])/(1.0*__cpu_to_be32( rational3[1])) + __cpu_to_be32( rational3[2])/(60.0*__cpu_to_be32( rational3[3]));
if (exif_dir[Exif_GPSInfo_GPSLongitudeRef_Index].ltag==Exif_GPSInfo_GPSLongitudeRef) {
lseek (fd_exif,
exif_page_start+exif_dir[Exif_GPSInfo_GPSLongitudeRef_Index].dst,
SEEK_SET);
read(fd_exif, val, 1);
if (val[0]!= 'E') longitude=-longitude;
}
sprintf (val,"%f",longitude);
printf("<GPSLongitude>\"%s\"</GPSLongitude>\n",val);
}
///GPS Latitude
if (exif_dir[Exif_GPSInfo_GPSLatitude_Index].ltag==Exif_GPSInfo_GPSLatitude) { // Exif_GPSInfo_GPSLatitude is present in template
lseek (fd_exif,
exif_page_start+exif_dir[Exif_GPSInfo_GPSLatitude_Index].dst,
SEEK_SET);
read(fd_exif, rational3, 24);
latitude=__cpu_to_be32( rational3[0])/(1.0*__cpu_to_be32( rational3[1])) + __cpu_to_be32( rational3[2])/(60.0*__cpu_to_be32( rational3[3]));
if (exif_dir[Exif_GPSInfo_GPSLatitudeRef_Index].ltag==Exif_GPSInfo_GPSLatitudeRef) {
lseek (fd_exif,
exif_page_start+exif_dir[Exif_GPSInfo_GPSLatitudeRef_Index].dst,
SEEK_SET);
read(fd_exif, val, 1);
if (val[0] != 'N') latitude=-latitude;
}
sprintf (val,"%f",latitude);
printf("<GPSLatitude>\"%s\"</GPSLatitude>\n",val);
}
///GPS Altitude
if (exif_dir[Exif_GPSInfo_GPSAltitude_Index].ltag==Exif_GPSInfo_GPSAltitude) { // Exif_GPSInfo_GPSAltitude is present in template
lseek (fd_exif,
exif_page_start+exif_dir[Exif_GPSInfo_GPSAltitude_Index].dst,
SEEK_SET);
read(fd_exif, rational3, 8);
altitude=(1.0*__cpu_to_be32( rational3[0]))/__cpu_to_be32( rational3[1]);
if (exif_dir[Exif_GPSInfo_GPSAltitudeRef_Index].ltag==Exif_GPSInfo_GPSAltitudeRef) {
lseek (fd_exif,
exif_page_start+exif_dir[Exif_GPSInfo_GPSAltitudeRef_Index].dst,
SEEK_SET);
read(fd_exif, val, 1);
if (val[0] != '\0') altitude=-altitude;
}
sprintf (val,"%f",altitude);
printf("<GPSAltitude>\"%s\"</GPSAltitude>\n",val);
}
///Compass Direction (magnetic)
if (exif_dir[Exif_GPSInfo_CompassDirection_Index].ltag==Exif_GPSInfo_CompassDirection) { // Exif_GPSInfo_CompassDirection is present in template
lseek (fd_exif,
exif_page_start+exif_dir[Exif_GPSInfo_CompassDirection_Index].dst,
SEEK_SET);
read(fd_exif, rational3, 8);
heading=(1.0*__cpu_to_be32( rational3[0]))/__cpu_to_be32( rational3[1]);
sprintf (val,"%f",heading);
printf("<CompassDirection>\"%s\"</CompassDirection>\n",val);
}
///Processing 'hacked' pitch and roll (made of Exif destination latitude/longitude)
///Compass Roll
if (exif_dir[Exif_GPSInfo_CompassRoll_Index].ltag==Exif_GPSInfo_CompassRoll) { // Exif_GPSInfo_CompassRoll is present in template
lseek (fd_exif,
exif_page_start+exif_dir[Exif_GPSInfo_CompassRoll_Index].dst,
SEEK_SET);
read(fd_exif, rational3, 8);
roll=(1.0*__cpu_to_be32( rational3[0]))/__cpu_to_be32( rational3[1]);
if (exif_dir[Exif_GPSInfo_CompassRollRef_Index].ltag==Exif_GPSInfo_CompassRollRef) {
lseek (fd_exif,
exif_page_start+exif_dir[Exif_GPSInfo_CompassRollRef_Index].dst,
SEEK_SET);
read(fd_exif, val, 1);
if (val[0] != EXIF_COMPASS_ROLL_ASCII[0]) roll=-roll;
}
sprintf (val,"%f",roll);
printf("<CompassRoll>\"%s\"</CompassRoll>\n",val);
}
///Compass Pitch
if (exif_dir[Exif_GPSInfo_CompassPitch_Index].ltag==Exif_GPSInfo_CompassPitch) { // Exif_GPSInfo_CompassPitch is present in template
lseek (fd_exif,
exif_page_start+exif_dir[Exif_GPSInfo_CompassPitch_Index].dst,
SEEK_SET);
read(fd_exif, rational3, 8);
pitch=(1.0*__cpu_to_be32( rational3[0]))/__cpu_to_be32( rational3[1]);
if (exif_dir[Exif_GPSInfo_CompassPitchRef_Index].ltag==Exif_GPSInfo_CompassPitchRef) {
lseek (fd_exif,
exif_page_start+exif_dir[Exif_GPSInfo_CompassPitchRef_Index].dst,
SEEK_SET);
read(fd_exif, val, 1);
if (val[0] != EXIF_COMPASS_PITCH_ASCII[0]) pitch=-pitch;
}
sprintf (val,"%f",pitch);
printf("<CompassPitch>\"%s\"</CompassPitch>\n",val);
}
close (fd_exif);
return 0;
}
int metaXML(int fd_circ, int mode) { /// mode: 0 - new (send headers), 1 - continue, 2 - finish
int frameParamPointer=0;
struct interframe_params_t frame_params;
int jpeg_len,jpeg_start,buff_size,timestamp_start;
if (mode==2) {/// just close the xml file
printf ("</meta>\n");
return 0;
} else if (mode==0) { /// open the XML output (length is undefined - multiple frames meta data might be output)
printf("HTTP/1.0 200 OK\n");
printf("Server: Elphel Imgsrv\n");
printf("Content-Type: text/xml\n");
printf("Pragma: no-cache\n");
printf("\n");
printf ("<?xml version=\"1.0\"?>\n" \
"<meta>\n");
}
jpeg_start=lseek(fd_circ,0,SEEK_CUR); //get the current read pointer
D(fprintf(stderr,"jpeg_start= (long)=0x%x\n",jpeg_start>>2));
if (jpeg_start <0 ) {
printf("<error>\"No frame at the current pointer\"</error>\n");
return -1;
}
buff_size=lseek(fd_circ,0,SEEK_END);
/// restore file poinetr after lseek-ing the end
lseek(fd_circ, jpeg_start, SEEK_SET);
frameParamPointer=jpeg_start-32;
if (frameParamPointer<0) frameParamPointer+=buff_size;
memcpy (&frame_params, (unsigned long * ) &ccam_dma_buf[frameParamPointer>>2],32); /// ccam_dma_buf - global
jpeg_len=frame_params.frame_length;
/// Copy timestamp (goes after the image data)
timestamp_start=jpeg_start+((jpeg_len+CCAM_MMAP_META+3) & (~0x1f)) + 32 - CCAM_MMAP_META_SEC; //! magic shift - should index first byte of the time stamp
if (timestamp_start >= buff_size) timestamp_start-=buff_size;
memcpy (&(frame_params.timestamp_sec), (unsigned long * ) &ccam_dma_buf[timestamp_start>>2],8);
///TODO: Parse Exif data if available and add here
printf ("<frame>\n" \
"<start> 0x%x </start>\n" \
"<hash32_r> 0x%x </hash32_r>\n" \
"<hash32_g> 0x%x </hash32_g>\n" \
"<hash32_gb>0x%x </hash32_gb>\n" \
"<hash32_b> 0x%x </hash32_b>\n" \
"<quality2> 0x%x </quality2>\n" \
"<color> 0x%x </color>\n" \
"<byrshift> 0x%x </byrshift>\n" \
"<width> 0x%x </width>\n" \
"<height> 0x%x </height>\n" \
"<meta_index> 0x%x </meta_index>\n" \
"<signffff> 0x%x </signffff>\n"
, (int) jpeg_start
, (int) frame_params.hash32_r
, (int) frame_params.hash32_g
, (int) frame_params.hash32_gb
, (int) frame_params.hash32_b
, (int) frame_params.quality2
, (int) frame_params.color /// color mode //18
, (int) frame_params.byrshift /// bayer shift in compressor //19
, (int) frame_params.width /// frame width, pixels 20-21 - NOTE: should be 20-21
, (int) frame_params.height /// frame height, pixels 22-23
, (int) frame_params.meta_index //! index of the linked meta page
, (int) frame_params.signffff
);
if (frame_params.signffff !=0xffff) {
printf("<error>\"wrong signature (should be 0xffff)\"</error>\n");
} else {
///Put Exif data here
printf ("<Exif>\n");
printExifXML(frame_params.meta_index);
printf ("</Exif>\n");
}
printf ("</frame>\n");
return 0;
}
int framePointersXML(int fd_circ) {
const char ctlFileName[]="/dev/frameparsall";
int fd_fparmsall;
char s[512]; // 341;
int p, wp, rp;
int nf=0;
int nfl=0;
int buf_free, buf_used;
int save_p; //! save current file pointer, then restore it before return
int frame8, frame_number, sensor_state, compressor_state;
char *cp_sensor_state, *cp_compressor_state;
struct framepars_all_t *frameParsAll;
struct framepars_t *framePars;
unsigned long *globalPars;
fd_fparmsall = open(ctlFileName, O_RDWR);
if (fd_fparmsall<0) { // check control OK
printf ("Error opening %s\n", ctlFileName);
fprintf(stderr,"%s:%d:%s: Error opening %s\n",__FILE__,__LINE__,__FUNCTION__, ctlFileName);
return -1;
}
//! now try to mmap
frameParsAll = (struct framepars_all_t *) mmap(0, sizeof (struct framepars_all_t) , PROT_READ, MAP_SHARED, fd_fparmsall, 0);
if((int)frameParsAll == -1) {
frameParsAll=NULL;
printf("Error in mmap /dev/frameparsall");
fprintf(stderr,"%s:%d:%s: Error in mmap in %s\n",__FILE__,__LINE__,__FUNCTION__,ctlFileName);
close (fd_fparmsall);
fd_fparmsall = -1;
return -1;
}
framePars=frameParsAll->framePars;
globalPars=frameParsAll->globalPars;
// Read current sensor state - defined in c313a.h
frame_number=lseek(fd_fparmsall, 0, SEEK_CUR );
frame8= frame_number & PARS_FRAMES_MASK;
// printf ("Current frame number is %d\n",frame_number);
sensor_state=framePars[frame8].pars[P_SENSOR_RUN];
compressor_state=framePars[frame8].pars[P_COMPRESSOR_RUN];
cp_sensor_state= (sensor_state==0)?
"SENSOR_RUN_STOP":
((sensor_state==1)?
"SENSOR_RUN_SINGLE":
((sensor_state==2)?"SENSOR_RUN_CONT":"UNKNOWN"));
cp_compressor_state= (compressor_state==0)?
"COMPRESSOR_RUN_STOP":
((compressor_state==1)?
"COMPRESSOR_RUN_SINGLE":
((compressor_state==2)?"COMPRESSOR_RUN_CONT":"UNKNOWN"));
save_p=lseek(fd_circ,0,SEEK_CUR); //!save current file pointer before temporarily moving it
rp=lseek(fd_circ,LSEEK_CIRC_TORP,SEEK_END); //! set current rp global rp (may be invalid <0)
wp=lseek(fd_circ,LSEEK_CIRC_TOWP,SEEK_END); //! set current rp pointer to FPGA write pointer
p=wp;
while ((p>=0) & (nf<500)) {
if (p==rp) nfl=nf;
p=lseek(fd_circ,LSEEK_CIRC_PREV,SEEK_END);
nf++;
}
buf_free=GLOBALPARS(G_FREECIRCBUF);
buf_used=GLOBALPARS(G_CIRCBUFSIZE)-GLOBALPARS(G_FREECIRCBUF);
lseek(fd_circ,save_p,SEEK_SET); //! restore file pointer after temporarily moving it
buf_free=lseek(fd_circ,LSEEK_CIRC_FREE,SEEK_END); //! will change file pointer
lseek(fd_circ,save_p,SEEK_SET); //! restore file pointer after temporarily moving it
buf_used=lseek(fd_circ,LSEEK_CIRC_USED,SEEK_END); //! will change file pointer
lseek(fd_circ,save_p,SEEK_SET); //! restore file pointer after temporarily moving it
sprintf (s,"<?xml version=\"1.0\"?>\n" \
"<frame_pointers>\n" \
" <this>%d</this>\n" \
" <write>%d</write>\n" \
" <read>%d</read>\n" \
" <frames>%d</frames>\n" \
" <left>%d</left>\n" \
" <free>%d</free>\n" \
" <used>%d</used>\n" \
" <frame>%d</frame>\n" \
" <sensor_state>\"%s\"</sensor_state>\n" \
" <compressor_state>\"%s\"</compressor_state>\n" \
"</frame_pointers>\n",
save_p,
wp,
rp,
nf-1,
nfl,
buf_free,
buf_used,
frame_number,
cp_sensor_state,
cp_compressor_state);
printf("HTTP/1.0 200 OK\n");
printf("Server: Elphel Imgsrv\n");
printf("Content-Length: %d\n",strlen(s));
printf("Content-Type: text/xml\n");
printf("Pragma: no-cache\n");
printf("\n");
printf(s);
//! No need to unmap?
close(fd_fparmsall);
D(fprintf (stderr,">%s< [%d bytes]\n",s,strlen(s)));
return 0;
}
//fwrite (&cbuffer[offset],1,bytesLeft,stdout);
int out1x1gif(void) {
char s[]="HTTP/1.0 200 OK\n" \
"Server: Elphel Imgsrv\n" \
"Content-Length: 35\n" \
"Content-Type: image/gif\n" \
"\n" \
"GIF87a\x01\x00\x01\x00\x80\x01\x00\x00\x00\x00" \
"\xff\xff\xff\x2c\x00\x00\x00\x00\x01\x00\x01\x00\x00\x02\x02\x4c" \
"\x01\x00\x3b";
fwrite (s,1,sizeof(s),stdout); //! we have zeros in the string
return 0; //! always good
}
void errorMsgXML(char * msg) {
char s[1024]; // was 701 acrtually
sprintf (s,"<?xml version=\"1.0\"?>\n" \
"<frame_params>\n" \
"<error>%s</error>\n" \
"</frame_params>\n",msg);
D(fprintf (stderr,">%s< [%d bytes]",s,strlen(s)));
printf("HTTP/1.0 200 OK\n");
printf("Server: Elphel Imgsrv\n");
printf("Content-Length: %d\n",strlen(s));
printf("Content-Type: text/xml\n");
printf("Pragma: no-cache\n");
printf("\n");
printf(s);
}
//! read pointer in fd_circ should be at the start of the frame to be sent
//! mmap will be opened in this function
int sendImage(int bufferImageData, int fd_circ, int use_Exif, int saveImage) {
const char HeadFileName[]="/dev/jpeghead";
const char ExifFileName[]="/dev/exif_exif";
int exifDataSize=0;
/// int exifIndexPointer=0;
int frameParamPointer=0;
struct interframe_params_t frame_params;
/// struct frame_exif_t frame_exif; //just 8 bytes
int buff_size;
int jpeg_len; //bytes
int jpeg_start; // bytes
int fd_head;
int fd_exif;
int head_size;
int jpeg_full_size, jpeg_this_size;
char * jpeg_copy;
int l,i;
/// int metadata_start; //metadata pointer (in bytes, from the start of the ccam_dma_buf)
jpeg_start=lseek(fd_circ,0,SEEK_CUR); //get the current read pointer
D(fprintf(stderr,"jpeg_start= (long)=0x%x\n",jpeg_start>>2));
fd_head = open(HeadFileName, O_RDWR);
if (fd_head<0) { // check control OK
fprintf (stderr,"Error opening %s\n", HeadFileName);
return -1;
}
lseek(fd_head,jpeg_start+1,SEEK_END); /// create JPEG header, find out it's size TODO:
head_size=lseek(fd_head,0,SEEK_END);
if (head_size>JPEG_HEADER_MAXSIZE) {
fprintf(stderr,"%s:%d: Too big JPEG header (%d > %d)",__FILE__,__LINE__,head_size, JPEG_HEADER_MAXSIZE );
close (fd_head);
return -2;
}
/*! find total buffer length (it is in defines, actually in c313a.h */
buff_size=lseek(fd_circ,0,SEEK_END);
/*! restore file poinetr after lseek-ing the end */
lseek(fd_circ, jpeg_start, SEEK_SET);
D(fprintf(stderr,"position (longs)=0x%x\n", (int) lseek(fd_circ,0,SEEK_CUR)>>2));
/*! now let's try mmap itself */
/// exifIndexPointer=jpeg_start-8;
frameParamPointer=jpeg_start-32;
if (frameParamPointer<0) frameParamPointer+=buff_size;
memcpy (&frame_params, (unsigned long * ) &ccam_dma_buf[frameParamPointer>>2],32);
jpeg_len=frame_params.frame_length;
if (frame_params.signffff !=0xffff) {
fprintf(stderr, "wrong signature - %d\r\n",(int) frame_params.signffff);
close (fd_head);
return -4;
}
if (use_Exif) {
D(fprintf(stderr,"frame_params.meta_index=0x%x\n",(int) frame_params.meta_index));
/// read Exif to buffer:
fd_exif = open(ExifFileName, O_RDONLY);
if (fd_exif<0) { // check control OK
fprintf (stderr,"Error opening %s\n", ExifFileName);
close (fd_head);
return -5;
}
exifDataSize=lseek(fd_exif,1,SEEK_END); // at the beginning of page 1 - position == page length
if (exifDataSize < 0) exifDataSize=0; // error from lseek;
if (!exifDataSize) close(fd_exif);
} else {
frame_params.meta_index=0;
fd_exif=-1;
}
///Maybe make buffer that will fit both Exif and JPEG?
//!Get metadata, update Exif and JFIF headers if ep and ed poinetrs are non-zero (NULL will generate files with JFIF-only headers)
/// Now we always malloc buffer, before - only for bimg, using fixed-size header buffer - was it faster?
jpeg_full_size=jpeg_len+head_size+2+exifDataSize;
if (bufferImageData) jpeg_this_size=jpeg_full_size; /// header+frame
else jpeg_this_size=head_size+exifDataSize; /// only header
jpeg_copy=malloc(jpeg_this_size);
if (!jpeg_copy) {
syslog(LOG_ERR, "%s:%d malloc (%d) failed", __FILE__,__LINE__,jpeg_this_size);
/// If we really want it, but don't get it - let's try more
for (i=0;i<10;i++) {
usleep(((jpeg_this_size & 0x3ff) + 5) * 100); // up to 0.1 sec
jpeg_copy=malloc(jpeg_this_size);
if (jpeg_copy) break;
syslog(LOG_ERR, "%s:%d malloc (%d) failed", __FILE__,__LINE__,jpeg_this_size);
}
if (!jpeg_copy) {
syslog(LOG_ERR, "%s:%d malloc (%d) failed 10 times - giving up", __FILE__,__LINE__,jpeg_this_size);
exit (1);
}
}
lseek(fd_head,0,0);
read (fd_head,&jpeg_copy[exifDataSize],head_size);
close (fd_head);
if (exifDataSize>0) {//! insert Exif
memcpy (jpeg_copy,&jpeg_copy[exifDataSize],2); //! copy first 2 bytes of the JFIF header before Exif
lseek(fd_exif,frame_params.meta_index,SEEK_END); //! select meta page to use (matching frame)
read (fd_exif,&jpeg_copy[2],exifDataSize); //! Insert Exif itself
close(fd_exif);
}
printf("Content-Type: image/jpeg\n");
if (saveImage) printf("Content-Disposition: attachment; filename=\"elphelimg_%ld.jpeg\"\n",frame_params.timestamp_sec); /// does not open, asks for filename to save
else printf("Content-Disposition: inline; filename=\"elphelimg_%ld.jpeg\"\n",frame_params.timestamp_sec); /// opens in browser, asks to save on right-click
if (bufferImageData) { /*! Buffer the whole file before sending over the network to make sure it will not be corrupted if the circular buffer will be overrun) */
l=head_size+exifDataSize;
/*! JPEG image data may be split in two segments (rolled over buffer end) - process both variants */
if ((jpeg_start+jpeg_len) > buff_size) { // two segments
memcpy (&jpeg_copy[l], (unsigned long * ) &ccam_dma_buf[jpeg_start>>2],buff_size-jpeg_start);
l+=buff_size-jpeg_start;
memcpy (&jpeg_copy[l],(unsigned long * ) &ccam_dma_buf[0],jpeg_len-(buff_size-jpeg_start));
} else { /*! single segment */
memcpy (&jpeg_copy[l],(unsigned long * ) &ccam_dma_buf[jpeg_start>>2],jpeg_len);
}
memcpy (&jpeg_copy[jpeg_len+head_size+exifDataSize],trailer,2);
printf("Content-Length: %d\n",jpeg_full_size);
printf("\n");
sendBuffer(jpeg_copy, jpeg_full_size);
} else { /*! fast connection, no need to buffer image, so we'll try to run it faster */
printf("Content-Length: %d\n",jpeg_full_size);
printf("\n");
sendBuffer(jpeg_copy, head_size+exifDataSize); //JPEG+Exif
/*! JPEG image data may be split in two segments (rolled over buffer end) - process both variants */
if ((jpeg_start+jpeg_len) > buff_size) { // two segments
/*! copy from the beginning of the frame to the end of the buffer */
sendBuffer((void *) &ccam_dma_buf[jpeg_start>>2], buff_size-jpeg_start);
/*! copy from the beginning of the buffer to the end of the frame */
sendBuffer((void *) &ccam_dma_buf[0], jpeg_len-(buff_size-jpeg_start));
} else { // single segment
/*! copy from the beginning of the frame to the end of the frame (no buffer rollovers) */
sendBuffer((void *) &ccam_dma_buf[jpeg_start>>2], jpeg_len);
}
sendBuffer(trailer,2);
}
free(jpeg_copy);
return 0;
}
/*! repeat writes to stdout until all data is sent */
void sendBuffer(void * buffer, int len) {
int bytesLeft=len;
int offset=0;
int bytesWritten;
char * cbuffer= (char *) buffer;
D(fprintf (stderr,"buffer=%p, len=%d\n",buffer, len));
while (bytesLeft>0) {
D(fprintf (stderr," --bytesLeft=%d\n",bytesLeft));
bytesWritten= fwrite (&cbuffer[offset],1,bytesLeft,stdout);
bytesLeft-= bytesWritten;
offset+= bytesWritten;
}
}
void listener_loop(int port)
{
char errormsg[1024];
const char circbufFileName[]="/dev/circbuf";
int fd_circ;
int this_p; //! current frame pointer (bytes)
int rslt;
int buf_images=0;
int suggest_save_images=0;
char buf [1024];
int len=0;
char * cp, *cp1, *cp2;
int slow,skip; // reduce frame rate by slow
int sent2socket=-1; // 1 - img, 2 - meta, 3 - pointers
struct sockaddr_in sock;
int res;
int one=1;
int buff_size;
memset((char *)&sock, 0, sizeof(sock));
sock.sin_port = htons(port);
sock.sin_family = AF_INET;
res = socket(AF_INET, SOCK_STREAM, 0);
setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one));
bind(res, (struct sockaddr * ) &sock,sizeof(sock));
listen(res, 10);
int exif_enable=1;
while (1) {
int fd;
fd = accept(res,NULL,0);
if (fd == -1) continue;
signal(SIGCHLD, SIG_IGN); // no zombies, please!
/*! do we need any fork at all if we now serve images to one client at a time? */
if (fork() == 0) {
close(res);
/*! setup stdin and stdout */
fflush(stdout);
fflush(stderr);
dup2(fd, 0);
dup2(fd, 1);
close(fd);
/*! We need just the first line of the GET to read parameters */
if (fgets(buf, sizeof(buf)-1, stdin)) len=strlen(buf);
cp=buf;
strsep(&cp, "/?"); // ignore everything before first "/" or "?"
if (cp) {
//! Now cp points to the first character after the first "/" or "?" in the url
//! we need to remove everything after (and including) the first space
cp1=strchr(cp,' ');
if (cp1) cp1[0]='\0';
}
if (!cp || (strlen(cp)==0)) { //!no url commands - probably the server url was manually entered
printf("HTTP/1.0 200 OK\n");
printf("Server: Elphel Imgsrv\n");
printf("Content-Length: %d\n",strlen(url_args));
printf("Content-Type: text/plain\n");
printf("\n");
printf(url_args);
fflush(stdout);
_exit(0);
}
//!now process the commands one at a time, but first - open the circbuf file and setup the pointer
fd_circ = open(circbufFileName, O_RDWR);
if (fd_circ<0) { // check control OK
fprintf (stderr,"Error opening %s\n", circbufFileName);
out1x1gif();
fflush(stdout);
_exit(0);
}
/*! find total buffer length (it is in defines, actually in c313a.h */
buff_size=lseek(fd_circ,0,SEEK_END);
/*! now let's try mmap itself */
ccam_dma_buf = (unsigned long *) mmap(0, buff_size, PROT_READ, MAP_SHARED, fd_circ, 0);
if((int)ccam_dma_buf == -1) {
fprintf(stderr, "Error in mmap\n");
close(fd_circ); // - caller opened, caller - to close
out1x1gif();
fflush(stdout);
_exit(0);
}
this_p=lseek(fd_circ,LSEEK_CIRC_LAST,SEEK_END);
//!continue with iterating through the commands
while ((cp1=strsep(&cp, "/?&"))) {
//!if the first caracter is digit,it is a file pointer
if (strchr("0123456789",cp1[0])) {
this_p= lseek(fd_circ,strtol(cp1, NULL, 10),SEEK_SET);
} else if ((strcmp(cp1, "img")==0) || (strcmp(cp1, "bimg")==0) || (strcmp(cp1, "simg")==0) || (strcmp(cp1, "sbimg")==0)) {
if (sent2socket>0) break; //! image/xmldata was already sent to socket, ignore
if (lseek(fd_circ,LSEEK_CIRC_READY,SEEK_END)<0) //! here passes OK, some not ready error is later, in sendimage (make it return different numbers)
rslt=out1x1gif();
else {
printf("HTTP/1.0 200 OK\n");
printf("Server: Elphel Imgsrv\n");
printf("Expires: 0\n");
printf("Pragma: no-cache\n");
buf_images= ((strcmp(cp1, "img")==0) || (strcmp(cp1, "simg")==0))?0:1;
suggest_save_images=((strcmp(cp1, "simg")==0) || (strcmp(cp1, "sbimg")==0))?1:0;
rslt=sendImage(buf_images, fd_circ, exif_enable, suggest_save_images); //! verify driver that file pointer did not move
}
sent2socket=1;
if (rslt<0) {
if (sent2socket==1) out1x1gif();
else {
sprintf(errormsg,"sendImage error = %d (%s:line %d)",rslt,__FILE__,__LINE__);
errorMsgXML(errormsg);
}
}
fflush(stdout); //! let's not keep client waiting - anyway we've sent it all even when more commands maybe left
///multipart - always last
} else if ((strncmp(cp1, "mimg",4)==0) || (strncmp(cp1, "bmimg",5)==0) || (strncmp(cp1, "mbimg",5)==0)) {
if (sent2socket>0) break; //! image/xmldata was already sent to socket, ignore
if (lseek(fd_circ,LSEEK_CIRC_READY,SEEK_END)<0) //! here passes OK, some not ready error is later, in sendimage (make it return different numbers)
rslt=out1x1gif();
else {
//TODO:
buf_images= (strncmp(cp1, "mimg",4)==0)?0:1;
cp2=cp1+(buf_images?5:4);
slow=strtol(cp2, NULL, 10);
if (slow < 1) slow =1;
printf("HTTP/1.0 200 OK\n");
printf("Server: Elphel Imgsrv\n");
printf("Expires: 0\n");
printf("Pragma: no-cache\n");
printf("Content-Type: multipart/x-mixed-replace;boundary=ElphelMultipartJPEGBoundary\n");
rslt=0;
while (rslt>=0) {
printf("\n--ElphelMultipartJPEGBoundary\n");
rslt=sendImage(buf_images, fd_circ, exif_enable, 0); //! verify driver that file pointer did not move
fflush(stdout);
if (rslt>=0) for (skip=0;skip<slow;skip++) {
this_p=lseek(fd_circ,LSEEK_CIRC_NEXT, SEEK_END);
/// If these "next" is not ready yet - wait, else - use latest image
if ((lseek(fd_circ,LSEEK_CIRC_VALID,SEEK_END) >= 0) && //! no sense to wait if the pointer is invalid
(lseek(fd_circ,LSEEK_CIRC_READY,SEEK_END) < 0) && //! or the frame is already ready
(lseek(fd_circ,LSEEK_CIRC_VALID,SEEK_END) >= 0)) //! test valid once again, after not ready - it might change
this_p=lseek(fd_circ,LSEEK_CIRC_WAIT,SEEK_END);
else this_p=lseek(fd_circ,LSEEK_CIRC_LAST, SEEK_END);
}
}
_exit(0);
}
} else if (strcmp(cp1, "pointers")==0) {
if (sent2socket>0) break; //! image/xmldata was already sent to socket, ignore
framePointersXML(fd_circ); //! will restore file pointer after itself
sent2socket=3;
fflush(stdout); //! let's not keep client waiting - anyway we've sent it all even when more commands maybe left
} else if (strcmp(cp1, "meta")==0) {
if ((sent2socket>0) && (sent2socket!=2)) break; //! image/xmldata was already sent to socket, ignore
metaXML(fd_circ,(sent2socket>0)?1:0); /// 0 - new (send headers), 1 - continue, 2 - finish
sent2socket=2;
fflush(stdout); //! let's not keep client waiting - anyway we've sent it all even when more commands maybe left
} else if (strcmp(cp1, "noexif")==0) {
exif_enable=0;
} else if (strcmp(cp1, "exif")==0) {
exif_enable=1;
} else if (strcmp(cp1, "torp")==0) {
this_p=lseek(fd_circ,LSEEK_CIRC_TORP, SEEK_END);
} else if (strcmp(cp1, "towp")==0) {
this_p=lseek(fd_circ,LSEEK_CIRC_TOWP, SEEK_END);
} else if (strcmp(cp1, "prev")==0) {
this_p=lseek(fd_circ,LSEEK_CIRC_PREV, SEEK_END);
} else if (strcmp(cp1, "next")==0) {
this_p=lseek(fd_circ,LSEEK_CIRC_NEXT, SEEK_END);
} else if (strcmp(cp1, "last")==0) {
this_p=lseek(fd_circ,LSEEK_CIRC_LAST, SEEK_END);
} else if (strcmp(cp1, "first")==0) {
this_p=lseek(fd_circ,LSEEK_CIRC_FIRST,SEEK_END);
} else if (strcmp(cp1, "second")==0) {
this_p=lseek(fd_circ,LSEEK_CIRC_SCND, SEEK_END);
} else if (strcmp(cp1, "save")==0) {
this_p=lseek(fd_circ,LSEEK_CIRC_SETP,SEEK_END);
} else if (strcmp(cp1, "wait")==0) {
if ((lseek(fd_circ,LSEEK_CIRC_VALID,SEEK_END) >= 0) && //! no sense to wait if the pointer is invalid
(lseek(fd_circ,LSEEK_CIRC_READY,SEEK_END) < 0) && //! or the frame is already ready
(lseek(fd_circ,LSEEK_CIRC_VALID,SEEK_END) >= 0)) //! test valid once again, after not ready - it might change
this_p=lseek(fd_circ,LSEEK_CIRC_WAIT,SEEK_END);
} else if (strcmp(cp1, "favicon.ico")==0) {
///ignore silently - for now, later make an icon?
} else {
if (cp1[0]!='_') fprintf(stderr,"Unrecognized URL command: \"%s\" - ignoring\n",cp1); //!allow "&_time=..." be silently ignored - needed for javascript image reload
}
} //!while ((cp1=strsep(&cp, "/?&")))
if (sent2socket<=0) { //! Nothing was sent to the client so far and the command line is over. Let's return 1x1 pixel gif
out1x1gif();
} else if (sent2socket==2) {
metaXML(fd_circ,2); /// 0 - new (send headers), 1 - continue, 2 - finish
}
fflush(stdout); // probably it is not needed anymore, just in case
_exit(0);
} // end of child process
close(fd); // parent
} // while (1)
}
/*! set port, start listening/answering HTTP requests */
int main(int argc, char *argv[])
{
const char usage[]= "Usage:\n%s -p <port_number>\n" \
"Start image server, bind it to port <port_number>\n";
int port;
if ((argc < 3) || (strcasecmp(argv[1], "-p"))) {
printf (usage,argv[0]);
printf (url_args);
return 0;
}
port=strtol(argv[2], NULL, 10);
if (!port) {printf ("Invalid port number %d\n", port); return -1;}
signal(SIGCHLD, SIG_IGN); // no zombies, please!
if (fork() == 0) { // child
listener_loop(port);
_exit(0); // should not get here?
} // end of child process
return 0;
}

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