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/*
* Copyright (c) 2013 Tim Ruehsen
* Copyright (c) 2015-2024 Free Software Foundation, Inc.
*
* This file is part of libwget.
*
* Libwget 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.
*
* Libwget 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 libwget. If not, see <https://www.gnu.org/licenses/>.
*
*
* Higher level CSS parsing routines
*
* Changelog
* 15.01.2013 Tim Ruehsen created
*
*/
#include <config.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <wget.h>
#include "private.h"
typedef struct {
const char
**encoding;
wget_vector
*uris;
} css_context;
static void url_free(void *url)
{
wget_css_parsed_url *u = url;
xfree(u->url);
xfree(u->abs_url);
xfree(u);
}
// Callback function, called from CSS parser for each @charset found.
static void get_encoding(void *context, const char *encoding, size_t len)
{
css_context *ctx = context;
// take only the first @charset rule
if (!*ctx->encoding) {
*ctx->encoding = wget_strmemdup(encoding, len);
debug_printf("URI content encoding = '%s'\n", *ctx->encoding);
}
}
// Callback function, called from CSS parser for each URI found.
static void get_url(void *context, const char *url, size_t len, size_t pos)
{
css_context *ctx = context;
wget_css_parsed_url *parsed_url;
if (!(parsed_url = wget_calloc(1, sizeof(wget_css_parsed_url))))
return;
if (!(parsed_url->url = wget_strmemdup(url, len))) {
xfree(parsed_url);
return;
}
parsed_url->len = len;
parsed_url->pos = pos;
if (!ctx->uris) {
ctx->uris = wget_vector_create(16, NULL);
wget_vector_set_destructor(ctx->uris, url_free);
}
wget_vector_add(ctx->uris, parsed_url);
}
static void urls_to_absolute(wget_vector *urls, wget_iri *base)
{
if (base && urls) {
wget_buffer buf;
wget_buffer_init(&buf, NULL, 1024);
for (int it = 0; it < wget_vector_size(urls); it++) {
wget_css_parsed_url *url = wget_vector_get(urls, it);
assert(url != NULL);
if (wget_iri_relative_to_abs(base, url->url, url->len, &buf))
url->abs_url = wget_strmemdup(buf.data, buf.length);
else
error_printf(_("Cannot resolve relative URI '%s'\n"), url->url);
}
wget_buffer_deinit(&buf);
}
}
wget_vector *wget_css_get_urls(const char *css, size_t len, wget_iri *base, const char **encoding)
{
css_context context = { .encoding = encoding };
wget_css_parse_buffer(css, len, get_url, encoding ? get_encoding : NULL, &context);
urls_to_absolute(context.uris, base);
return context.uris;
}
wget_vector *wget_css_get_urls_from_localfile(const char *fname, wget_iri *base, const char **encoding)
{
css_context context = { .encoding = encoding };
wget_css_parse_file(fname, get_url, encoding ? get_encoding : NULL, &context);
urls_to_absolute(context.uris, base);
return context.uris;
}
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