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https://code.videolan.org/videolan/vlc
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data: add access for data URI scheme
As defined in RFC2397.
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@ -5,6 +5,9 @@ AM_CPPFLAGS += -I$(srcdir)/access
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### Files ###
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libdata_plugin_la_SOURCES = access/data.c
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access_LTLIBRARIES += libdata_plugin.la
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libdcp_plugin_la_SOURCES = access/dcp/dcpparser.h access/dcp/dcp.cpp access/dcp/dcpparser.cpp access/dcp/dcpdecrypt.cpp
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if HAVE_ASDCP
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libdcp_plugin_la_CPPFLAGS = $(AM_CPPFLAGS) $(ASDCP_CFLAGS)
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168
modules/access/data.c
Normal file
168
modules/access/data.c
Normal file
@ -0,0 +1,168 @@
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/*****************************************************************************
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* data.c: data URL scheme
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*****************************************************************************
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* Copyright (C) 2021 Rémi Denis-Courmont
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_access.h>
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#include <vlc_strings.h>
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#include <vlc_url.h>
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struct access_data {
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size_t type_length;
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size_t length;
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size_t offset;
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char *data;
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};
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static ssize_t Read(stream_t *access, void *buf, size_t len)
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{
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struct access_data *sys = access->p_sys;
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size_t avail = sys->length - sys->offset;
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assert(sys->offset <= sys->length);
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if (len > avail)
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len = avail;
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memcpy(buf, sys->data + sys->offset, len);
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sys->offset += len;
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return len;
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}
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static int Seek(stream_t *access, uint64_t position)
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{
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struct access_data *sys = access->p_sys;
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sys->offset = (position <= sys->length) ? position : sys->length;
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return VLC_SUCCESS;
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}
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static int Control(stream_t *access, int query, va_list args)
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{
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struct access_data *sys = access->p_sys;
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switch (query)
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{
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case STREAM_CAN_SEEK:
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case STREAM_CAN_FASTSEEK:
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case STREAM_CAN_PAUSE:
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case STREAM_CAN_CONTROL_PACE:
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*va_arg(args, bool *) = true;
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return VLC_SUCCESS;
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case STREAM_GET_SIZE:
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*va_arg(args, uint64_t *) = sys->length;
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return VLC_SUCCESS;
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case STREAM_GET_PTS_DELAY:
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*va_arg(args, vlc_tick_t *) = DEFAULT_PTS_DELAY;
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return VLC_SUCCESS;
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case STREAM_GET_CONTENT_TYPE: {
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char *type = strndup(access->psz_url + 5, sys->type_length);
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*va_arg(args, char **) = type;
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return likely(type != NULL) ? VLC_SUCCESS : VLC_ENOMEM;
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}
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case STREAM_SET_PAUSE_STATE:
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return VLC_SUCCESS;
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}
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return VLC_ENOTSUP;
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}
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static int Open(vlc_object_t *obj)
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{
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stream_t *access = (stream_t *)obj;
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const char *url = access->psz_url;
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if (strncmp(url, "data:", 5))
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return VLC_ENOTSUP;
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url += 5;
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struct access_data *sys = vlc_obj_malloc(obj, sizeof (*sys));
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if (unlikely(sys == NULL))
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return VLC_ENOMEM;
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const char *data = strchr(url, ',');
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if (unlikely(data == NULL)) {
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msg_Err(obj, "invalid data URL");
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return VLC_EINVAL;
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}
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sys->data = vlc_uri_decode_duplicate(data + 1);
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if (unlikely(sys->data == NULL))
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return -errno;
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sys->type_length = data - url;
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sys->length = strlen(sys->data);
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sys->offset = 0;
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if ((data - url) >= 7 && strncmp(data - 7, ";base64", 7) == 0) {
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sys->type_length -= 7; /* ";base64" is not part of the type */
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size_t size = sys->length - (sys->length / 4);
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char *d = malloc(size);
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if (likely(d != NULL))
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sys->length = vlc_b64_decode_binary_to_buffer(d, size, sys->data);
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free(sys->data);
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sys->data = d;
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if (unlikely(d == NULL))
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return VLC_ENOMEM;
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}
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access->pf_read = Read;
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access->pf_block = NULL;
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access->pf_seek = Seek;
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access->pf_control = Control;
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access->p_sys = sys;
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return VLC_SUCCESS;
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}
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static void Close(vlc_object_t *obj)
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{
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stream_t *access = (stream_t *)obj;
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struct access_data *sys = access->p_sys;
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free(sys->data);
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}
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vlc_module_begin()
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set_shortname(N_("data"))
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set_description(N_("data URI scheme"))
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set_category(CAT_INPUT)
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set_subcategory(SUBCAT_INPUT_ACCESS)
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set_capability("access", 0)
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set_callbacks(Open, Close)
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add_shortcut("data")
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vlc_module_end()
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@ -157,6 +157,7 @@ modules/access/avio.h
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modules/access/bluray.c
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modules/access/cdda.c
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modules/access/concat.c
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modules/access/data.c
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modules/access/dc1394.c
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modules/access/dcp/dcp.cpp
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modules/access/decklink.cpp
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