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rsvg-io.c
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rsvg-io.c
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/* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
Copyright (C) 2000 Eazel, Inc.
Copyright (C) 2002, 2003, 2004, 2005 Dom Lachowicz <cinamod@hotmail.com>
Copyright (C) 2003, 2004, 2005 Caleb Moore <c.moore@student.unsw.edu.au>
Copyright © 2011, 2012 Christian Persch
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this program; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "rsvg-io.h"
#include "rsvg-private.h"
#include <string.h>
/* Copied from soup-request-data.c (LGPL2+):
* Copyright (C) 2009, 2010 Red Hat, Inc.
* Copyright (C) 2010 Igalia, S.L.
* and from soup-uri.c:
* Copyright 1999-2003 Ximian, Inc.
*/
#define XDIGIT(c) ((c) <= '9' ? (c) - '0' : ((c) & 0x4F) - 'A' + 10)
#define HEXCHAR(s) ((XDIGIT (s[1]) << 4) + XDIGIT (s[2]))
static char *
uri_decoded_copy (const char *part,
gsize length)
{
unsigned char *s, *d;
char *decoded = g_strndup (part, length);
s = d = (unsigned char *)decoded;
do {
if (*s == '%') {
if (!g_ascii_isxdigit (s[1]) ||
!g_ascii_isxdigit (s[2])) {
*d++ = *s;
continue;
}
*d++ = HEXCHAR (s);
s += 2;
} else {
*d++ = *s;
}
} while (*s++);
return decoded;
}
#define BASE64_INDICATOR ";base64"
#define BASE64_INDICATOR_LEN (sizeof (";base64") - 1)
static char *
rsvg_decode_data_uri (const char *uri,
char **out_mime_type,
gsize *out_len,
GError **error)
{
const char *comma, *start, *end;
char *mime_type;
char *data;
gsize data_len;
gboolean base64 = FALSE;
g_assert (out_len != NULL);
g_assert (strncmp (uri, "data:", 5) == 0);
mime_type = NULL;
start = uri + 5;
comma = strchr (start, ',');
if (comma && comma != start) {
/* Deal with MIME type / params */
if (comma > start + BASE64_INDICATOR_LEN &&
!g_ascii_strncasecmp (comma - BASE64_INDICATOR_LEN, BASE64_INDICATOR, BASE64_INDICATOR_LEN)) {
end = comma - BASE64_INDICATOR_LEN;
base64 = TRUE;
} else {
end = comma;
}
if (end != start) {
mime_type = uri_decoded_copy (start, end - start);
}
}
if (comma)
start = comma + 1;
if (*start) {
data = uri_decoded_copy (start, strlen (start));
if (base64)
data = (char *) g_base64_decode_inplace (data, &data_len);
else
data_len = strlen (data);
} else {
data = NULL;
data_len = 0;
}
if (out_mime_type)
*out_mime_type = mime_type;
else
g_free (mime_type);
*out_len = data_len;
return data;
}
static char *
rsvg_acquire_file_data (const char *uri,
char **out_mime_type,
gsize *out_len,
GCancellable *cancellable,
GError **error)
{
GFile *file;
gchar *path, *data;
gsize len;
char *content_type;
rsvg_return_val_if_fail (uri != NULL, NULL, error);
g_assert (out_len != NULL);
file = g_file_new_for_uri (uri);
path = g_file_get_path (file);
if (path == NULL) {
g_object_unref (file);
return NULL;
}
if (!g_file_get_contents (path, &data, &len, error)) {
g_free (path);
g_object_unref (file);
return NULL;
}
if (out_mime_type &&
(content_type = g_content_type_guess (path, (guchar *) data, len, NULL))) {
*out_mime_type = g_content_type_get_mime_type (content_type);
g_free (content_type);
}
g_free (path);
g_object_unref (file);
*out_len = len;
return data;
}
static GInputStream *
rsvg_acquire_gvfs_stream (const char *uri,
const char *base_uri,
char **out_mime_type,
GCancellable *cancellable,
GError **error)
{
GFile *base, *file;
GFileInputStream *stream;
GError *err = NULL;
file = g_file_new_for_uri (uri);
stream = g_file_read (file, cancellable, &err);
g_object_unref (file);
if (stream == NULL &&
g_error_matches (err, G_IO_ERROR, G_IO_ERROR_NOT_FOUND)) {
g_clear_error (&err);
base = g_file_new_for_uri (base_uri);
file = g_file_resolve_relative_path (base, uri);
g_object_unref (base);
stream = g_file_read (file, cancellable, &err);
g_object_unref (file);
}
if (stream == NULL) {
g_propagate_error (error, err);
return NULL;
}
if (out_mime_type) {
GFileInfo *file_info;
const char *content_type;
file_info = g_file_input_stream_query_info (stream,
G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
cancellable,
NULL /* error */);
if (file_info &&
(content_type = g_file_info_get_content_type (file_info)))
*out_mime_type = g_content_type_get_mime_type (content_type);
else
*out_mime_type = NULL;
if (file_info)
g_object_unref (file_info);
}
return G_INPUT_STREAM (stream);
}
static char *
rsvg_acquire_gvfs_data (const char *uri,
const char *base_uri,
char **out_mime_type,
gsize *out_len,
GCancellable *cancellable,
GError **error)
{
GFile *base, *file;
GError *err;
char *data;
gsize len;
char *content_type;
gboolean res;
file = g_file_new_for_uri (uri);
err = NULL;
data = NULL;
if (!(res = g_file_load_contents (file, cancellable, &data, &len, NULL, &err)) &&
g_error_matches (err, G_IO_ERROR, G_IO_ERROR_NOT_FOUND) &&
base_uri != NULL) {
g_clear_error (&err);
g_object_unref (file);
base = g_file_new_for_uri (base_uri);
file = g_file_resolve_relative_path (base, uri);
g_object_unref (base);
res = g_file_load_contents (file, cancellable, &data, &len, NULL, &err);
}
g_object_unref (file);
if (err) {
g_propagate_error (error, err);
return NULL;
}
if (out_mime_type &&
(content_type = g_content_type_guess (uri, (guchar *) data, len, NULL))) {
*out_mime_type = g_content_type_get_mime_type (content_type);
g_free (content_type);
}
*out_len = len;
return data;
}
char *
_rsvg_io_acquire_data (const char *href,
const char *base_uri,
char **mime_type,
gsize *len,
GCancellable *cancellable,
GError **error)
{
char *data;
gsize llen;
if (!(href && *href)) {
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Invalid URI");
return NULL;
}
if (!len)
len = &llen;
if (strncmp (href, "data:", 5) == 0)
return rsvg_decode_data_uri (href, mime_type, len, error);
if ((data = rsvg_acquire_file_data (href, mime_type, len, cancellable, NULL)))
return data;
if ((data = rsvg_acquire_gvfs_data (href, base_uri, mime_type, len, cancellable, error)))
return data;
return NULL;
}
GInputStream *
_rsvg_io_acquire_stream (const char *href,
const char *base_uri,
char **mime_type,
GCancellable *cancellable,
GError **error)
{
GInputStream *stream;
char *data;
gsize len;
if (!(href && *href)) {
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Invalid URI");
return NULL;
}
if (strncmp (href, "data:", 5) == 0) {
if (!(data = rsvg_decode_data_uri (href, mime_type, &len, error)))
return NULL;
return g_memory_input_stream_new_from_data (data, len, (GDestroyNotify) g_free);
}
if ((data = rsvg_acquire_file_data (href, mime_type, &len, cancellable, NULL)))
return g_memory_input_stream_new_from_data (data, len, (GDestroyNotify) g_free);
if ((stream = rsvg_acquire_gvfs_stream (href, base_uri, mime_type, cancellable, error)))
return stream;
return NULL;
}