/**
* @short Returns known options.
*
* Just known options, no more. I think many clients ignore this. (without PUT, gnome's file manager was trying).
*/
onion_connection_status onion_webdav_options(const char *filename, onion_webdav *wd, onion_request *req, onion_response *res){
onion_response_set_header(res, "Allow", "OPTIONS,GET,HEAD,PUT,PROPFIND");
onion_response_set_header(res, "Content-Type", "httpd/unix-directory");
onion_response_set_length(res, 0);
onion_response_write_headers(res);
return OCS_PROCESSED;
}
//HTTP handler to forward http requests
int forward(void *p, onion_request *req, onion_response *res){
if (onion_request_get_flags(req)&OR_GET){
printf("We got a GET. WOHOOOOOO!!!\n")
}
//Set header and type
onion_response_set_header(res, "HTTP-Translator", "Forward that data");
onion_response_set_header(res, "Content-Type", "text/plain");
//Set example message
onion_response_write0(res, "First try");
//Tell if everything worked properly
return OCS_PROCESSED;
}
/**
* @short Main webdav handler, just redirects to the proper handler depending on headers and method
*/
onion_connection_status onion_webdav_handler(onion_webdav *wd, onion_request *req, onion_response *res){
onion_response_set_header(res, "Dav", "1,2");
onion_response_set_header(res, "MS-Author-Via", "DAV");
#ifdef __DEBUG__
const onion_block *data=onion_request_get_data(req);
if (data){
ONION_DEBUG0("Have data!\n %s", onion_block_data(data));
}
#endif
char filename[512];
snprintf(filename, sizeof(filename), "%s/%s", wd->path, onion_request_get_path(req));
ONION_DEBUG("Check %s and %s", wd->path, filename);
if (wd->check_permissions(wd->path, filename, req)!=0){
return onion_shortcut_response("Forbidden", HTTP_FORBIDDEN, req, res);
}
switch (onion_request_get_flags(req)&OR_METHODS){
case OR_GET:
case OR_HEAD:
return onion_webdav_get(filename, wd, req, res);
case OR_OPTIONS:
return onion_webdav_options(filename, wd, req, res);
case OR_PROPFIND:
return onion_webdav_propfind(filename, wd, req, res);
case OR_PUT:
return onion_webdav_put(filename, wd, req, res);
case OR_DELETE:
return onion_webdav_delete(filename, wd, req, res);
case OR_MOVE:
return onion_webdav_move(filename, wd, req, res);
case OR_MKCOL:
return onion_webdav_mkcol(filename, wd, req, res);
case OR_PROPPATCH:
return onion_webdav_proppatch(filename, wd, req, res);
}
onion_response_set_code(res, HTTP_NOT_IMPLEMENTED);
onion_response_write0(res, "<h1>Work in progress...</h1>\n");
return OCS_PROCESSED;
}
/**
* @short Sets the header length. Normally it should be through set_header, but as its very common and needs some procesing here is a shortcut
* @memberof onion_response_t
*/
void onion_response_set_length(onion_response *res, size_t len){
if (len!=res->sent_bytes && res->flags&OR_HEADER_SENT){
ONION_WARNING("Trying to set length after headers sent. Undefined onion behaviour.");
return;
}
char tmp[16];
sprintf(tmp,"%lu",(unsigned long)len);
onion_response_set_header(res, "Content-Length", tmp);
res->length=len;
res->flags|=OR_LENGTH_SET;
}
/**
* @short Shortcut to answer some json data
*
* It converts to json the passed dict and returns it. The dict is freed before returning.
*/
onion_connection_status onion_shortcut_response_json(onion_dict *d, onion_request *req, onion_response *res){
onion_response_set_header(res, "Content-Type", "application/json");
onion_block *bl=onion_dict_to_json(d);
onion_dict_free(d);
char tmp[16];
snprintf(tmp,sizeof(tmp),"%ld",(long)onion_block_size(bl));
int ret=onion_shortcut_response_extra_headers(onion_block_data(bl), HTTP_OK, req, res, "Content-Length", tmp, NULL);
onion_block_free(bl);
return ret;
}
int onion_handler_auth_pam_handler(onion_handler_auth_pam_data *d, onion_request *request, onion_response *res){
/// Use session to know if already logged in, so do not mess with PAM so often.
if (onion_request_get_session(request, "pam_logged_in"))
return onion_handler_handle(d->inside, request, res);
const char *o=onion_request_get_header(request, "Authorization");
char *auth=NULL;
char *username=NULL;
char *passwd=NULL;
if (o && strncmp(o,"Basic",5)==0){
//fprintf(stderr,"auth: '%s'\n",&o[6]);
auth=onion_base64_decode(&o[6], NULL);
username=auth;
int i=0;
while (auth[i]!='\0' && auth[i]!=':') i++;
if (auth[i]==':'){
auth[i]='\0'; // so i have user ready
passwd=&auth[i+1];
}
else
passwd=NULL;
}
// I have my data, try to authorize
if (username && passwd){
int ok=authorize(d->pamname, username, passwd);
if (ok){ // I save the username at the session, so it can be accessed later.
onion_dict *session=onion_request_get_session_dict(request);
onion_dict_lock_write(session);
onion_dict_add(session, "username", username, OD_REPLACE|OD_DUP_VALUE);
onion_dict_add(session, "pam_logged_in", username, OD_REPLACE|OD_DUP_VALUE);
onion_dict_unlock(session);
free(auth);
return onion_handler_handle(d->inside, request, res);
}
}
if (auth)
free(auth);
// Not authorized. Ask for it.
char temp[256];
sprintf(temp, "Basic realm=\"%s\"",d->realm);
onion_response_set_header(res, "WWW-Authenticate",temp);
onion_response_set_code(res, HTTP_UNAUTHORIZED);
onion_response_set_length(res,sizeof(RESPONSE_UNAUTHORIZED));
onion_response_write(res,RESPONSE_UNAUTHORIZED,sizeof(RESPONSE_UNAUTHORIZED));
return OCS_PROCESSED;
}
/**
* @short Handles a propfind
*
* @param path the shared path.
*/
onion_connection_status onion_webdav_propfind(const char *filename, onion_webdav *wd, onion_request* req, onion_response* res){
// Prepare the basepath, necesary for props.
char *basepath=NULL;
int pathlen=0;
const char *current_path=onion_request_get_path(req);
const char *fullpath=onion_request_get_fullpath(req);
pathlen=(current_path-fullpath);
basepath=alloca(pathlen+1);
memcpy(basepath, fullpath, pathlen+1);
ONION_DEBUG0("Pathbase initial <%s> %d", basepath, pathlen);
while(basepath[pathlen]=='/' && pathlen>0)
pathlen--;
basepath[pathlen+1]=0;
ONION_DEBUG0("PROPFIND; pathbase %s", basepath);
int depth;
{
const char *depths=onion_request_get_header(req, "Depth");
if (!depths){
ONION_ERROR("Missing Depth header on webdav request");
return OCS_INTERNAL_ERROR;
}
if (strcmp(depths,"infinity")==0){
ONION_ERROR("Infinity depth not supported yet.");
return OCS_INTERNAL_ERROR;
}
depth=atoi(depths);
}
int props=onion_webdav_parse_propfind(onion_request_get_data(req));
ONION_DEBUG("Asking for props %08X, depth %d", props, depth);
onion_block *block=onion_webdav_write_propfind(basepath, filename, onion_request_get_path(req), depth, props);
if (!block) // No block, resource does not exist
return onion_shortcut_response("Not found", HTTP_NOT_FOUND, req, res);
ONION_DEBUG0("Printing block %s", onion_block_data(block));
onion_response_set_header(res, "Content-Type", "text/xml; charset=\"utf-8\"");
onion_response_set_length(res, onion_block_size(block));
onion_response_set_code(res, HTTP_MULTI_STATUS);
onion_response_write_headers(res);
onion_response_flush(res);
onion_response_write(res, onion_block_data(block), onion_block_size(block));
onion_block_free(block);
return OCS_PROCESSED;
}
/**
* @short Sets a new cookie into the response.
* @ingroup response
*
* @param res Response object
* @param cookiename Name for the cookie
* @param cookievalue Value for the cookis
* @param validity_t Seconds this cookie is valid (added to current datetime). -1 to do not expire, 0 to expire inmediatly.
* @param path Cookie valid only for this path
* @param Domain Cookie valid only for this domain (www.example.com, or *.example.com).
* @param flags Flags from onion_cookie_flags_t, for example OC_SECURE or OC_HTTP_ONLY
*
* @returns boolean indicating succesfully added the cookie or not.
*
* If validity is 0, cookie is set to expire right now.
*
* If the cookie is too long (all data > 4096), it is not added. A warning is
* emmited and returns false.
*/
bool onion_response_add_cookie(onion_response * res, const char *cookiename,
const char *cookievalue, time_t validity_t,
const char *path, const char *domain,
int flags) {
char data[4096];
int pos;
pos = snprintf(data, sizeof(data), "%s=%s", cookiename, cookievalue);
if (validity_t == 0)
pos +=
snprintf(data + pos, sizeof(data) - pos,
"; expires=Thu, 01 Jan 1970 00:00:00 GMT");
else if (validity_t > 0) {
struct tm *tmp;
time_t t = time(NULL) + validity_t;
tmp = localtime(&t);
pos +=
strftime(data + pos, sizeof(data) - pos,
"; expires=%a, %d %b %Y %H:%M:%S %Z", tmp);
}
if (path)
pos += snprintf(data + pos, sizeof(data) - pos, "; path=%s", path);
if (domain)
pos += snprintf(data + pos, sizeof(data) - pos, "; domain=%s", domain);
if (flags & OC_HTTP_ONLY)
pos += snprintf(data + pos, sizeof(data) - pos, "; HttpOnly");
if (flags & OC_SECURE)
pos += snprintf(data + pos, sizeof(data) - pos, "; Secure");
if (pos >= sizeof(data)) {
ONION_WARNING("Cookie too long to be constructed. Not added to response.");
return false;
}
onion_response_set_header(res, "Set-Cookie", data);
ONION_DEBUG("Set cookie %s", data);
return true;
}
/**
* @short Shortcut for fast responses, like errors, with extra headers
*
* Prepares a fast response. You pass only the request, the text and the code, and it do the full response
* object and sends the data.
*
* On this version you also pass a NULL terminated list of headers, in key, value pairs.
*/
onion_connection_status onion_shortcut_response_extra_headers(const char* response, int code, onion_request* req, onion_response *res, ... ){
unsigned int l=strlen(response);
const char *key, *value;
onion_response_set_length(res,l);
onion_response_set_code(res,code);
va_list ap;
va_start(ap, res);
while ( (key=va_arg(ap, const char *)) ){
value=va_arg(ap, const char *);
if (key && value)
onion_response_set_header(res, key, value);
else
break;
}
va_end(ap);
onion_response_write_headers(res);
onion_response_write(res,response,l);
return OCS_PROCESSED;
}
/**
* @short Handles a propfind
*
* @param path the shared path.
*/
onion_connection_status onion_webdav_propfind(const char *filename, onion_webdav *wd, onion_request* req, onion_response* res){
ONION_DEBUG0("PROPFIND");
int depth;
{
const char *depths=onion_request_get_header(req, "Depth");
if (!depths){
ONION_ERROR("Missing Depth header on webdav request");
return OCS_INTERNAL_ERROR;
}
if (strcmp(depths,"infinity")==0){
ONION_ERROR("Infinity depth not supported yet.");
return OCS_INTERNAL_ERROR;
}
depth=atoi(depths);
}
int props=onion_webdav_parse_propfind(onion_request_get_data(req));
ONION_DEBUG("Asking for props %08X, depth %d", props, depth);
onion_block *block=onion_webdav_write_propfind(filename, onion_request_get_path(req), depth, props);
if (!block) // No block, resource does not exist
return onion_shortcut_response("Not found", HTTP_NOT_FOUND, req, res);
ONION_DEBUG0("Printing block %s", onion_block_data(block));
onion_response_set_header(res, "Content-Type", "text/xml; charset=\"utf-8\"");
onion_response_set_length(res, onion_block_size(block));
onion_response_set_code(res, HTTP_MULTI_STATUS);
onion_response_write(res, onion_block_data(block), onion_block_size(block));
onion_block_free(block);
return OCS_PROCESSED;
}
/**
* @short Returns the directory listing
*/
int onion_handler_export_local_directory(onion_handler_export_local_data *data, const char *realp, const char *showpath, onion_request *req, onion_response *res){
DIR *dir=opendir(realp);
if (!dir) // Continue on next. Quite probably a custom error.
return 0;
onion_response_set_header(res, "Content-Type", "text/html; charset=utf-8");
onion_response_write0(res,"<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n"
"<html>\n"
" <head><meta content=\"text/html; charset=UTF-8\" http-equiv=\"content-type\"/>\n");
onion_response_printf(res,"<title>Directory listing of %s</title>\n",showpath);
onion_response_write0(res,"</head>\n"
" <body>\n"
"<script>\n"
"showListing = function(){\n"
" var q = function(t){\n"
" return t.replace('\"','%22')\n"
" } \n"
" var t=document.getElementById('filebody')\n"
" while ( t.childNodes.length >= 1 )\n"
" t.removeChild( t.firstChild ); \n"
" for (var i=0;i<files.length;i++){\n"
" var f=files[i]\n"
" var h='<tr class=\"'+f[3]+'\"><td><a href=\"'+q(f[0])+'\">'+f[0]+'</a></td><td>'+f[1]+'</td><td>'+f[2]+'</td></tr>'\n"
" t.innerHTML+=h\n"
" }\n"
"}\n"
"\n"
"update = function(n){\n"
" var _cmp = function(a,b){\n"
" if (a[n]<b[n])\n"
" return -1\n"
" if (a[n]>b[n])\n"
" return 1\n"
" return 0\n"
" }\n"
" files=files.sort(_cmp)\n"
" showListing()\n"
"}\n"
"window.onload=function(){\n"
" files=files.splice(0,files.length-1)\n"
" update(0)\n"
"}\n"
"\n"
"files=[\n");
struct dirent *fi;
struct stat st;
char temp[1024];
struct passwd *pwd;
while ( (fi=readdir(dir)) != NULL ){
if (fi->d_name[0]=='.')
continue;
snprintf(temp,sizeof(temp),"%s/%s",realp,fi->d_name);
stat(temp, &st);
pwd=getpwuid(st.st_uid);
if (S_ISDIR(st.st_mode))
onion_response_printf(res, " ['%s/',%d,'%s','dir'],\n",fi->d_name, st.st_size, pwd ? pwd->pw_name : "???");
else
onion_response_printf(res, " ['%s',%d,'%s','file'],\n",fi->d_name, st.st_size, pwd ? pwd->pw_name : "???");
}
onion_response_write0(res," [] ]\n</script>\n");
if (data->renderer_header)
data->renderer_header(res, showpath);
onion_response_write0(res,"<table id=\"filelist\">\n"
"<thead><tr>\n"
" <th onclick=\"update(0)\" id=\"filename\">Filename</th>\n"
" <th onclick=\"update(1)\" id=\"size\">Size</th>"
" <th onclick=\"update(2)\" id=\"owner\">Owner</th></tr>\n"
"</thead>\n"
"<tbody id=\"filebody\">\n</tbody>\n</table>\n</body>\n");
if (data->renderer_footer)
data->renderer_footer(res, showpath);
onion_response_write0(res,"</body></html>");
closedir(dir);
return OCS_PROCESSED;
}
/**
* @short This shortcut returns the given file contents.
*
* It sets all the compilant headers (TODO), cache and so on.
*
* This is the recomended way to send static files; it even can use sendfile Linux call
* if suitable (TODO).
*
* It does no security checks, so caller must be security aware.
*/
onion_connection_status onion_shortcut_response_file(const char *filename, onion_request *request, onion_response *res){
int fd=open(filename,O_RDONLY|O_CLOEXEC);
if (fd<0)
return OCS_NOT_PROCESSED;
if(O_CLOEXEC == 0) { // Good compiler know how to cut this out
int flags=fcntl(fd, F_GETFD);
if (flags==-1){
ONION_ERROR("Retrieving flags from file descriptor");
}
flags|=FD_CLOEXEC;
if (fcntl(fd, F_SETFD, flags)==-1){
ONION_ERROR("Setting O_CLOEXEC to file descriptor");
}
}
struct stat st;
if (stat(filename, &st)!=0){
ONION_WARNING("File does not exist: %s",filename);
close(fd);
return OCS_NOT_PROCESSED;
}
if (S_ISDIR(st.st_mode)){
close(fd);
return OCS_NOT_PROCESSED;
}
size_t length=st.st_size;
char etag[64];
onion_shortcut_etag(&st, etag);
const char *range=onion_request_get_header(request, "Range");
if (range){
strncat(etag,range,sizeof(etag)-1);
}
onion_response_set_header(res, "Etag", etag);
if (range && strncmp(range,"bytes=",6)==0){
onion_response_set_code(res, HTTP_PARTIAL_CONTENT);
//ONION_DEBUG("Need just a range: %s",range);
char tmp[1024];
strncpy(tmp, range+6, 1024);
char *start=tmp;
char *end=tmp;
while (*end!='-' && *end) end++;
if (*end=='-'){
*end='\0';
end++;
//ONION_DEBUG("Start %s, end %s",start,end);
size_t ends, starts;
if (*end)
ends=atol(end);
else
ends=length;
starts=atol(start);
length=ends-starts+1;
lseek(fd, starts, SEEK_SET);
snprintf(tmp,sizeof(tmp),"bytes %d-%d/%d",(unsigned int)starts, (unsigned int)ends, (unsigned int)st.st_size);
//onion_response_set_header(res, "Accept-Ranges","bytes");
onion_response_set_header(res, "Content-Range",tmp);
}
}
onion_response_set_length(res, length);
onion_response_set_header(res, "Content-Type", onion_mime_get(filename) );
ONION_DEBUG("Mime type is %s",onion_mime_get(filename));
ONION_DEBUG0("Etag %s", etag);
const char *prev_etag=onion_request_get_header(request, "If-None-Match");
if (prev_etag && (strcmp(prev_etag, etag)==0)){
ONION_DEBUG0("Not modified");
onion_response_set_length(res, 0);
onion_response_set_code(res, HTTP_NOT_MODIFIED);
onion_response_write_headers(res);
close(fd);
return OCS_PROCESSED;
}
onion_response_write_headers(res);
if ((onion_request_get_flags(request)&OR_HEAD) == OR_HEAD){ // Just head.
length=0;
}
if (length){
#ifdef USE_SENDFILE
if (request->connection.listen_point->write==(void*)onion_http_write){ // Lets have a house party! I can use sendfile!
onion_response_write(res,NULL,0);
ONION_DEBUG("Using sendfile");
int r=sendfile(request->connection.fd, fd, NULL, length);
ONION_DEBUG("Wrote %d, should be %d (%s)", r, length, r==length ? "ok" : "nok");
if (r!=length || r<0){
ONION_ERROR("Could not send all file (%s)", strerror(errno));
close(fd);
return OCS_INTERNAL_ERROR;
}
res->sent_bytes+=length;
res->sent_bytes_total+=length;
}
else
#endif
{ // Ok, no I cant, do it as always.
int r=0,w;
size_t tr=0;
char tmp[4046];
if (length>sizeof(tmp)){
size_t max=length-sizeof(tmp);
while( tr<max ){
r=read(fd,tmp,sizeof(tmp));
tr+=r;
if (r<0)
break;
w=onion_response_write(res, tmp, r);
if (w!=r){
ONION_ERROR("Wrote less than read: write %d, read %d. Quite probably closed connection.",w,r);
break;
}
}
}
if (sizeof(tmp) >= (length-tr)){
r=read(fd, tmp, length-tr);
w=onion_response_write(res, tmp, r);
if (w!=r){
ONION_ERROR("Wrote less than read: write %d, read %d. Quite probably closed connection.",w,r);
}
}
}
}
close(fd);
return OCS_PROCESSED;
}
void setHeader(const std::string &k, const std::string &v){
onion_response_set_header(ptr, k.c_str(), v.c_str());
}
int onion_jpeg_response ( unsigned char * image,
int image_num_color_channels,
J_COLOR_SPACE image_color_space, /* See jpeglib.h for list of available color spaces. */
int image_width,
int image_height,
int output_quality,
onion_response *res
)
{
struct jpeg_compress_struct cinfo;
struct onion_error_mgr jerr;
/* More stuff */
JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
int row_stride; /* physical row width in image buffer */
onion_response_set_header(res, "Content-Type", "image/jpeg");
if (onion_response_write_headers(res)==OR_SKIP_CONTENT) // Maybe it was HEAD.
return OCS_PROCESSED;
/* Step 1: allocate and initialize JPEG compression object */
// 1.1 Setup used error routines
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = onion_error_exit;
/* Establish the setjmp return context for onion_error_exit to use. */
if (setjmp(jerr.setjmp_buffer)) {
/* If we get here, the JPEG code has signaled an error.
* We need to clean up the JPEG object, and return.
*/
jpeg_destroy_compress(&cinfo);
return 0;
}
jpeg_create_compress(&cinfo);
/* Step 2: specify data destination */
onion_jpeg_data ojd;
ojd.res=res;
ojd.sent=0;
cinfo.client_data = (void *)&ojd;
// Set function handler to operate directly on response buffers
struct jpeg_destination_mgr dest;
cinfo.dest = &dest;
cinfo.dest->init_destination = &onion_init_destination;
cinfo.dest->empty_output_buffer = &onion_empty_output_buffer;
cinfo.dest->term_destination = &onion_term_destination;
/* Step 3: set parameters for compression */
/* First we supply a description of the input image.
* Four fields of the cinfo struct must be filled in:
*/
cinfo.image_width = image_width; /* image width and height, in pixels */
cinfo.image_height = image_height;
cinfo.input_components = image_num_color_channels; /* # of color components per pixel */
cinfo.in_color_space = image_color_space; /* colorspace of input image */
/* Now use the library's routine to set default compression parameters.
* (You must set at least cinfo.in_color_space before calling this,
* since the defaults depend on the source color space.)
*/
jpeg_set_defaults(&cinfo);
/* Now you can set any non-default parameters you wish to.
* Here we just illustrate the use of quality (quantization table) scaling:
*/
jpeg_set_quality(&cinfo, output_quality, TRUE /* limit to baseline-JPEG values */);
// If header already sent, then there was an error.
if (ojd.sent){
return OCS_PROCESSED;
}
/* Step 4: Start compressor */
/* TRUE ensures that we will write a complete interchange-JPEG file.
* Pass TRUE unless you are very sure of what you're doing.
*/
jpeg_start_compress(&cinfo, TRUE);
/* Step 5: while (scan lines remain to be written) */
/* jpeg_write_scanlines(...); */
/* Here we use the library's state variable cinfo.next_scanline as the
* loop counter, so that we don't have to keep track ourselves.
* To keep things simple, we pass one scanline per call; you can pass
* more if you wish, though.
*/
row_stride = image_width * image_num_color_channels; /* JSAMPLEs per row in image_buffer */
while (cinfo.next_scanline < cinfo.image_height) {
/* jpeg_write_scanlines expects an array of pointers to scanlines.
* Here the array is only one element long, but you could pass
* more than one scanline at a time if that's more convenient.
*/
row_pointer[0] = & image[cinfo.next_scanline * row_stride];
(void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
// Check if response creation was aborted.
if (ojd.sent){
break;
}
}
ojd.sent=1;
/* Step 6: Finish compression */
jpeg_finish_compress(&cinfo);
/* Step 7: release JPEG compression object */
jpeg_destroy_compress(&cinfo);
/* That's it */
return OCS_PROCESSED;
}
/**
* @short Writes an image as png to the response object
*
* @param image flat buffer with all pixels
* @param Bpp Bytes per pixel: 1 grayscale, 2 grayscale with alpha, 3 RGB, 4 RGB with alpha. Negative if in BGR format (cairo)
* @param width The width of the image
* @param height The height of the image
* @param res where to write the image, it sets the necessary structs
*/
int onion_png_response(unsigned char *image, int Bpp, int width, int height, onion_response *res){
// Many copied from example.c from libpng source code.
png_structp png_ptr;
png_infop info_ptr;
/* Create and initialize the png_struct with the desired error handler
* functions. If you want to use the default stderr and longjump method,
* you can supply NULL for the last three parameters. We also check that
* the library version is compatible with the one used at compile time,
* in case we are using dynamically linked libraries. REQUIRED.
*/
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, error, warning);
if (png_ptr == NULL)
{
return OCS_INTERNAL_ERROR;
}
/* Allocate/initialize the image information data. REQUIRED */
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL)
{
png_destroy_write_struct(&png_ptr, NULL);
return OCS_INTERNAL_ERROR;
}
onion_png_data opd;
opd.res=res;
opd.sent=0;
png_set_write_fn(png_ptr, (void *)&opd, onion_png_write, onion_png_flush);
/* where user_io_ptr is a structure you want available to the callbacks */
onion_response_set_header(res, "Content-Type", "image/png");
if (onion_response_write_headers(res)==OR_SKIP_CONTENT) // Maybe it was HEAD.
return OCS_PROCESSED;
/* Set the image information here. Width and height are up to 2^31,
* bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
* the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
* PNG_COLOR_TYPE_GRAY_ALPHA, PNG_COLOR_TYPE_PALETTE, PNG_COLOR_TYPE_RGB,
* or PNG_COLOR_TYPE_RGB_ALPHA. interlace is either PNG_INTERLACE_NONE or
* PNG_INTERLACE_ADAM7, and the compression_type and filter_type MUST
* currently be PNG_COMPRESSION_TYPE_BASE and PNG_FILTER_TYPE_BASE. REQUIRED
*/
if (Bpp<0){
png_set_bgr(png_ptr);
Bpp=-Bpp;
}
switch(Bpp){
case 1:
png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_GRAY,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
break;
case 2:
png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_GRAY_ALPHA,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
break;
case 3:
png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
break;
case 4:
png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB_ALPHA,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
break;
default:
png_error(png_ptr, "Wrong bytes per pixel");
break;
}
png_uint_32 k;
png_bytep row_pointers[height];
if (height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
png_error (png_ptr, "Image is too tall to process in memory");
for (k = 0; k < height; k++)
row_pointers[k] = (png_byte *) (image + k*width*Bpp);
// Sets the rows to save at the image
png_set_rows(png_ptr, info_ptr, row_pointers);
// If header already sent, then there was an error.
if (opd.sent){
return OCS_PROCESSED;
}
opd.sent=1;
// Finally WRITE the image. Uses the onion_response_write via onion_png_write helper.
png_write_png(png_ptr, info_ptr, 0, NULL);
/* Clean up after the write, and free any memory allocated */
png_destroy_write_struct(&png_ptr, &info_ptr);
/* That's it */
return OCS_PROCESSED;
}