/*
* Receive and process new chunks of JPEG image data
*/
static void Jpeg_write(DilloJpeg *jpeg, void *Buf, uint_t BufSize)
{
DilloImgType type;
uchar_t *linebuf;
JSAMPLE *array[1];
int num_read;
_MSG("Jpeg_write: (%p) Bytes in buff: %ld Ofs: %lu\n", jpeg,
(long) BufSize, (ulong_t)jpeg->Start_Ofs);
/* See if we are supposed to skip ahead. */
if (BufSize <= jpeg->Start_Ofs)
return;
/* Concatenate with the partial input, if any. */
jpeg->cinfo.src->next_input_byte = (uchar_t *)Buf + jpeg->Start_Ofs;
jpeg->cinfo.src->bytes_in_buffer = BufSize - jpeg->Start_Ofs;
jpeg->NewStart = BufSize;
jpeg->Data = Buf;
if (setjmp(jpeg->jerr.setjmp_buffer)) {
/* If we get here, the JPEG code has signaled an error. */
jpeg->state = DILLO_JPEG_ERROR;
}
/* Process the bytes in the input buffer. */
if (jpeg->state == DILLO_JPEG_INIT) {
/* decompression step 3 (see libjpeg.doc) */
if (jpeg_read_header(&(jpeg->cinfo), TRUE) != JPEG_SUSPENDED) {
type = DILLO_IMG_TYPE_GRAY;
if (jpeg->cinfo.num_components == 1) {
type = DILLO_IMG_TYPE_GRAY;
} else if (jpeg->cinfo.num_components == 3) {
type = DILLO_IMG_TYPE_RGB;
} else {
MSG("4-component JPEG!\n");
if (jpeg->cinfo.jpeg_color_space == JCS_YCCK)
MSG("YCCK. Are the colors wrong?\n");
if (!jpeg->cinfo.saw_Adobe_marker)
MSG("No adobe marker! Is the image shown in reverse video?\n");
type = DILLO_IMG_TYPE_CMYK_INV;
}
/*
* If a multiple-scan image is not completely in cache,
* use progressive display, updating as it arrives.
*/
if (jpeg_has_multiple_scans(&jpeg->cinfo) &&
!(a_Capi_get_flags(jpeg->url) & CAPI_Completed))
jpeg->cinfo.buffered_image = TRUE;
/* check max image size */
if (jpeg->cinfo.image_width <= 0 || jpeg->cinfo.image_height <= 0 ||
jpeg->cinfo.image_width >
IMAGE_MAX_AREA / jpeg->cinfo.image_height) {
MSG("Jpeg_write: suspicious image size request %u x %u\n",
(uint_t)jpeg->cinfo.image_width,
(uint_t)jpeg->cinfo.image_height);
jpeg->state = DILLO_JPEG_ERROR;
return;
}
a_Dicache_set_parms(jpeg->url, jpeg->version, jpeg->Image,
(uint_t)jpeg->cinfo.image_width,
(uint_t)jpeg->cinfo.image_height,
type);
/* decompression step 4 (see libjpeg.doc) */
jpeg->state = DILLO_JPEG_STARTING;
}
}
if (jpeg->state == DILLO_JPEG_STARTING) {
/* decompression step 5 (see libjpeg.doc) */
if (jpeg_start_decompress(&(jpeg->cinfo))) {
jpeg->y = 0;
jpeg->state = jpeg->cinfo.buffered_image ?
DILLO_JPEG_READ_BEGIN_SCAN : DILLO_JPEG_READ_IN_SCAN;
}
}
/*
* A progressive jpeg contains multiple scans that can be used to display
* an increasingly sharp image as it is being received. The reading of each
* scan must be surrounded by jpeg_start_output()/jpeg_finish_output().
*/
if (jpeg->state == DILLO_JPEG_READ_END_SCAN) {
if (jpeg_finish_output(&jpeg->cinfo)) {
if (jpeg_input_complete(&jpeg->cinfo)) {
jpeg->state = DILLO_JPEG_DONE;
} else {
jpeg->state = DILLO_JPEG_READ_BEGIN_SCAN;
}
}
}
if (jpeg->state == DILLO_JPEG_READ_BEGIN_SCAN) {
if (jpeg_start_output(&jpeg->cinfo, jpeg->cinfo.input_scan_number)) {
a_Dicache_new_scan(jpeg->url, jpeg->version);
jpeg->state = DILLO_JPEG_READ_IN_SCAN;
}
}
if (jpeg->state == DILLO_JPEG_READ_IN_SCAN) {
linebuf = dMalloc(jpeg->cinfo.image_width *
jpeg->cinfo.num_components);
array[0] = linebuf;
while (1) {
num_read = jpeg_read_scanlines(&(jpeg->cinfo), array, 1);
if (num_read == 0) {
/* out of input */
break;
}
a_Dicache_write(jpeg->url, jpeg->version, linebuf, jpeg->y);
jpeg->y++;
if (jpeg->y == jpeg->cinfo.image_height) {
/* end of scan */
if (!jpeg->cinfo.buffered_image) {
/* single scan */
jpeg->state = DILLO_JPEG_DONE;
break;
} else {
jpeg->y = 0;
if (jpeg_input_complete(&jpeg->cinfo)) {
if (jpeg->cinfo.input_scan_number ==
jpeg->cinfo.output_scan_number) {
jpeg->state = DILLO_JPEG_DONE;
break;
} else {
/* one final loop through the scanlines */
jpeg_finish_output(&jpeg->cinfo);
jpeg_start_output(&jpeg->cinfo,
jpeg->cinfo.input_scan_number);
continue;
}
}
jpeg->state = DILLO_JPEG_READ_END_SCAN;
if (!jpeg_finish_output(&jpeg->cinfo)) {
/* out of input */
break;
} else {
if (jpeg_input_complete(&jpeg->cinfo)) {
jpeg->state = DILLO_JPEG_DONE;
break;
} else {
jpeg->state = DILLO_JPEG_READ_BEGIN_SCAN;
}
}
if (!jpeg_start_output(&jpeg->cinfo,
jpeg->cinfo.input_scan_number)) {
/* out of input */
break;
}
a_Dicache_new_scan(jpeg->url, jpeg->version);
jpeg->state = DILLO_JPEG_READ_IN_SCAN;
}
}
}
dFree(linebuf);
}
}
/*
* Most used function for requesting a URL.
* TODO: clean up the ad-hoc bindings with an API that allows dynamic
* addition of new plugins.
*
* Return value: A primary key for identifying the client,
* 0 if the client is aborted in the process.
*/
int a_Capi_open_url(DilloWeb *web, CA_Callback_t Call, void *CbData)
{
int reload;
char *cmd, *server;
capi_conn_t *conn = NULL;
const char *scheme = URL_SCHEME(web->url);
int safe = 0, ret = 0, use_cache = 0;
/* reload test */
reload = (!(a_Capi_get_flags(web->url) & CAPI_IsCached) ||
(URL_FLAGS(web->url) & URL_E2EQuery));
if (web->flags & WEB_Download) {
/* download request: if cached save from cache, else
* for http, ftp or https, use the downloads dpi */
if (a_Capi_get_flags_with_redirection(web->url) & CAPI_IsCached) {
if (web->filename) {
if ((web->stream = fopen(web->filename, "w"))) {
use_cache = 1;
} else {
MSG_WARN("Cannot open \"%s\" for writing.\n", web->filename);
}
}
} else if (a_Cache_download_enabled(web->url)) {
server = "downloads";
cmd = Capi_dpi_build_cmd(web, server);
a_Capi_dpi_send_cmd(web->url, web->bw, cmd, server, 1);
dFree(cmd);
}
} else if (Capi_url_uses_dpi(web->url, &server)) {
/* dpi request */
if ((safe = a_Capi_dpi_verify_request(web->bw, web->url))) {
if (dStrcasecmp(scheme, "dpi") == 0) {
/* make "dpi:/" prefixed urls always reload. */
a_Url_set_flags(web->url, URL_FLAGS(web->url) | URL_E2EQuery);
reload = 1;
}
if (reload) {
a_Capi_conn_abort_by_url(web->url);
/* Send dpip command */
cmd = Capi_dpi_build_cmd(web, server);
a_Capi_dpi_send_cmd(web->url, web->bw, cmd, server, 1);
dFree(cmd);
}
use_cache = 1;
}
dFree(server);
} else if (!dStrcasecmp(scheme, "http")) {
/* http request */
if (reload) {
a_Capi_conn_abort_by_url(web->url);
/* create a new connection and start the CCC operations */
conn = Capi_conn_new(web->url, web->bw, "http", "none");
/* start the reception branch before the query one because the DNS
* may callback immediatly. This may avoid a race condition. */
a_Capi_ccc(OpStart, 2, BCK, a_Chain_new(), conn, "http");
a_Capi_ccc(OpStart, 1, BCK, a_Chain_new(), conn, web);
}
use_cache = 1;
} else if (!dStrcasecmp(scheme, "about")) {
/* internal request */
use_cache = 1;
}
if (use_cache) {
if (!conn || (conn && Capi_conn_valid(conn))) {
/* not aborted, let's continue... */
ret = a_Cache_open_url(web, Call, CbData);
}
} else {
a_Web_free(web);
}
return ret;
}
