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/* This file is part of GEGL
*
* GEGL is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* GEGL 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2014 Jon Nordby, The Grid <jononor@gmail.com>
*/
#include <gegl-gio-private.h>
#include <string.h>
#include <stdio.h>
#ifdef G_OS_WIN32
#include <windows.h>
#include <gio/gwin32inputstream.h>
#else
#include <gio/gunixinputstream.h>
#endif
/**
* datauri_parse_header:
* @uri: URI to parse
* @raw_data_out: (out) (transfer full): return location for pointer to raw data, following header
* @header_items_no_out: (out) (transfer none): return location for number of items parsed from header
*
* Return value: (transfer full): header_item[0] is content-type, header_items[1] is encoding, free with g_strfreev()
*
* Note: currently private API
*/
static gchar **
datauri_parse_header(const gchar *uri, gchar **raw_data_out, gint *header_items_no_out)
{
// Determine data format
const gchar * header_end = g_strstr_len (uri, -1, ",");
const gint data_prefix_len = strlen("data:");
const gint header_len = header_end - uri - data_prefix_len;
gchar *header = g_strndup(uri+data_prefix_len, header_len);
gchar **header_items = g_strsplit(header, ";", 3);
gint header_items_no = -1;
while (header_items[++header_items_no]) {
}
g_free(header);
if (header_items_no_out)
{
*header_items_no_out = header_items_no;
}
if (raw_data_out)
{
*raw_data_out = (gchar *)uri+data_prefix_len+header_len;
}
return header_items;
}
// Supports data embedded in the URI itself
// http://en.wikipedia.org/wiki/Data_URI_scheme
// https://developer.mozilla.org/en-US/docs/Web/HTTP/data_URIs
static GInputStream *
input_stream_datauri(const gchar *uri)
{
GInputStream *stream = NULL;
gchar * raw_data = NULL;
gint header_items_no = 0;
gchar **header_items = datauri_parse_header(uri, &raw_data, &header_items_no);
const gboolean is_base64 = header_items_no > 1 && g_strcmp0(header_items[1], "base64") == 0;
if (is_base64) {
gsize len = 0;
guchar * data = g_base64_decode (raw_data, &len);
stream = g_memory_input_stream_new_from_data (data, len, g_free);
} else {
gchar *data = g_strdup(raw_data);
const gint len = strlen(data);
stream = g_memory_input_stream_new_from_data (data, len, g_free);
}
g_strfreev(header_items);
return stream;
}
gchar *
gegl_gio_datauri_get_content_type(const gchar *uri)
{
gchar *content_type = NULL;
gint header_items_no = 0;
gchar **header_items = datauri_parse_header(uri, NULL, &header_items_no);
if (header_items_no)
content_type = g_strdup(header_items[0]);
g_strfreev(header_items);
return content_type;
}
gboolean
gegl_gio_uri_is_datauri(const gchar *uri)
{
return g_str_has_prefix(uri, "data:");
}
/**
* gegl_gio_open_input_stream:
* @uri: (allow none) URI to open. @uri is preferred over @path if both are set
* @path: (allow none) path to open.
* @out_file: (out) (transfer full): return location for GFile, if stream is for a file
*
* Return value: (transfer full): A new #GInputStream, free with g_object_unref()
*
* Note: currently private API
*/
GInputStream *
gegl_gio_open_input_stream(const gchar *uri, const gchar *path, GFile **out_file, GError **err)
{
GFile *infile = NULL;
GInputStream *fis = NULL;
g_return_val_if_fail(uri || path, NULL);
g_return_val_if_fail(out_file, NULL);
if (path && g_strcmp0(path, "-") == 0)
{
const gboolean close_fd = FALSE;
infile = NULL;
#ifdef G_OS_WIN32
fis = g_win32_input_stream_new (GetStdHandle (STD_INPUT_HANDLE), close_fd);
#else
fis = g_unix_input_stream_new(STDIN_FILENO, close_fd);
#endif
}
else if (uri && strlen(uri) > 0)
{
if (gegl_gio_uri_is_datauri(uri))
{
fis = input_stream_datauri(uri);
}
else
{
infile = g_file_new_for_uri(uri);
}
}
else if (path && strlen(path) > 0)
{
infile = g_file_new_for_path(path);
}
else {
return NULL;
}
if (infile)
{
g_assert(!fis);
fis = G_INPUT_STREAM(g_file_read(infile, NULL, err));
*out_file = infile;
}
return fis;
}
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