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netsurf/content/url_store.c

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/*
* This file is part of NetSurf, http://netsurf.sourceforge.net/
* Licensed under the GNU General Public License,
* http://www.opensource.org/licenses/gpl-license
* Copyright 2005 Richard Wilson <info@tinct.net>
*/
/** \file
* Central repository for URL data (implementation).
*/
#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "netsurf/content/url_store.h"
#ifdef riscos
#include "netsurf/riscos/bitmap.h"
#endif
#include "netsurf/utils/url.h"
#include "netsurf/utils/log.h"
#define ITERATIONS_BEFORE_TEST 32
#define MAXIMUM_URL_LENGTH 1024
struct hostname_data {
char *hostname; /** Hostname (lowercase) */
int hostname_length; /** Length of hostname */
struct url_data *url; /** URLs for this host */
struct hostname_data *previous; /** Previous hostname */
struct hostname_data *next; /** Next hostname */
};
static struct hostname_data *url_store_hostnames = NULL;
static struct hostname_data *url_store_find_hostname(const char *url);
static struct hostname_data *url_store_match_hostname(const char *url,
struct hostname_data *previous);
static char *url_store_match_scheme = NULL;
/**
* Returns the hostname data for the specified URL. If no hostname
* data is currently available then it is created.
*
* \param url the url to find hostname data for
* \return the current hostname data, or NULL on error
*/
static struct hostname_data *url_store_find_hostname(const char *url) {
struct hostname_data *search;
struct hostname_data *result;
url_func_result res;
char *hostname;
int hostname_length;
int compare;
int fast_exit_counter = ITERATIONS_BEFORE_TEST;
assert(url);
res = url_host(url, &hostname);
if (res != URL_FUNC_OK) {
hostname = strdup("file:/"); /* for 'file:/' */
if (!hostname)
return NULL;
}
hostname_length = strlen(hostname);
/* try to find a matching hostname fairly quickly */
for (search = url_store_hostnames; search; search = search->next) {
if ((fast_exit_counter <= 0) ||
(search->hostname_length == hostname_length)) {
compare = strcmp(hostname, search->hostname);
if (compare == 0) {
free(hostname);
return search;
} else if (compare < 0)
break;
fast_exit_counter = ITERATIONS_BEFORE_TEST;
} else {
fast_exit_counter--;
}
}
/* no hostname is available: create a new one */
result = calloc(sizeof(struct hostname_data), 1);
if (!result)
return NULL;
result->hostname = hostname;
result->hostname_length = hostname_length;
/* simple case: no current hostnames */
if (!url_store_hostnames) {
url_store_hostnames = result;
return result;
}
/* worst case scenario: the place we need to link is within the last
* section of the hostname list so we have no reference to work back
* from. rather than slowing with the very common case of searching,
* we take a speed hit for this case and simply move to the very end
* of the hostname list ready to work backwards. */
if (!search)
for (search = url_store_hostnames; search->next;
search = search->next);
/* we can now simply scan backwards as we know roughly where we need
* to link to (we either had an early exit from the searching so we
* know we're in the block following where we need to link, or we're
* at the very end of the list as we were in the last block.) */
while ((search) && (strcmp(hostname, search->hostname) < 0))
search = search->previous;
/* simple case: our new hostname is the first in the list */
if (!search) {
result->next = url_store_hostnames;
url_store_hostnames->previous = result;
url_store_hostnames = result;
return result;
}
/* general case: link in after the found hostname */
result->previous = search;
result->next = search->next;
if (search->next)
search->next->previous = result;
search->next = result;
return result;
}
/**
* Returns the url data for the specified URL. If no url
* data is currently available then it is created.
*
* \param url a normalized url to find hostname data for
* \return the current hostname data, or NULL on error
*/
struct url_content *url_store_find(const char *url) {
struct hostname_data *hostname_data;
struct url_data *search;
struct url_data *result;
int url_length;
int compare;
int fast_exit_counter = ITERATIONS_BEFORE_TEST;
assert(url);
/* find the corresponding hostname data */
hostname_data = url_store_find_hostname(url);
if (!hostname_data)
return NULL;
/* move to the start of the leafname */
url_length = strlen(url);
/* try to find a matching url fairly quickly */
for (search = hostname_data->url; search; search = search->next) {
if ((fast_exit_counter <= 0) ||
(search->data.url_length == url_length)) {
compare = strcmp(url, search->data.url);
if (compare == 0)
return &search->data;
else if (compare < 0)
break;
fast_exit_counter = ITERATIONS_BEFORE_TEST;
} else {
fast_exit_counter--;
}
}
/* no URL is available: create a new one */
result = calloc(sizeof(struct url_data), 1);
if (!result)
return NULL;
result->data.url = malloc(url_length + 1);
if (!result->data.url) {
free(result);
return NULL;
}
strcpy(result->data.url, url);
result->data.url_length = url_length;
result->data.requests = 0;
result->data.visits = 0;
result->parent = hostname_data;
/* simple case: no current URLs */
if (!hostname_data->url) {
hostname_data->url = result;
return &result->data;
}
/* worst case scenario: the place we need to link is within the last
* section of the URL list so we have no reference to work back
* from. rather than slowing with the very common case of searching,
* we take a speed hit for this case and simply move to the very end
* of the URL list ready to work backwards. */
if (!search)
for (search = hostname_data->url; search->next;
search = search->next);
/* we can now simply scan backwards as we know roughly where we need
* to link to (we either had an early exit from the searching so we
* know we're in the block following where we need to link, or we're
* at the very end of the list as we were in the last block.) */
while ((search) && (strcmp(url, search->data.url) < 0))
search = search->previous;
/* simple case: our new hostname is the first in the list */
if (!search) {
result->next = hostname_data->url;
hostname_data->url->previous = result;
hostname_data->url = result;
return &result->data;
}
/* general case: link in after the found hostname */
result->previous = search;
result->next = search->next;
if (search->next)
search->next->previous = result;
search->next = result;
return &result->data;
}
/**
* Returns the next hostname that matches a part of the specified URL.
*
* \param url a normalized url to find the next match for
* \param current the current hostname to search forward from, or NULL
* \return the next matching hostname, or NULL
*/
static struct hostname_data *url_store_match_hostname(const char *url,
struct hostname_data *current) {
url_func_result res;
char *hostname;
int hostname_length;
int compare;
bool www_test;
assert(url);
res = url_host(url, &hostname);
if (res != URL_FUNC_OK) {
hostname = strdup("file:/"); /* for 'file:/' */
if (!hostname)
return NULL;
}
hostname_length = strlen(hostname);
www_test = strncmp(hostname, "www.", 4);
/* advance to the next hostname */
if (!current)
current = url_store_hostnames;
else
current = current->next;
/* skip past hostname data without URLs */
for (; current && (!current->url); current = current->next);
while (current) {
if (current->hostname_length >= hostname_length) {
compare = strncmp(hostname, current->hostname,
hostname_length);
if (compare == 0) {
free(hostname);
return current;
} else if ((compare < 0) && !www_test)
break;
}
/* special case: if hostname is not www then try it */
if (www_test && ((current->hostname_length - 4) >=
hostname_length) &&
(!strncmp(current->hostname, "www.", 4)) &&
(!strncmp(hostname, current->hostname + 4,
hostname_length))) {
free(hostname);
return current;
}
/* move to next hostname with URLs */
current = current->next;
for (; current && (!current->url); current = current->next);
}
free(hostname);
return NULL;
}
/**
* Returns the complete URL for the next matched stored URL.
*
* \param url a normalized url to find the next match for
* \param reference internal reference (NULL for first call)
* \return the next URL that matches
*/
char *url_store_match(const char *url, struct url_data **reference) {
struct hostname_data *hostname;
struct url_data *search = NULL;
int scheme_length;
int url_length;
url_func_result res;
bool www_test;
assert(url);
if (!url_store_hostnames)
return NULL;
/* find the scheme and first URL, not necessarily matching */
if (!*reference) {
hostname = url_store_match_hostname(url, NULL);
if (!hostname)
return NULL;
if (url_store_match_scheme) {
free(url_store_match_scheme);
url_store_match_scheme = NULL;
}
res = url_scheme(url, &url_store_match_scheme);
if (res != URL_FUNC_OK)
return NULL;
} else {
search = *reference;
hostname = search->parent;
}
scheme_length = strlen(url_store_match_scheme);
url_length = strlen(url);
www_test = (!strcmp(url_store_match_scheme, "http") &&
strncmp(url + 4 + 3, "www.", 4)); /* 'http' + '://' */
/* work through all our strings, ignoring the scheme and 'www.' */
while (hostname) {
/* get the next URL to test */
if (!search)
search = hostname->url;
else
search = search->next;
/* loop past end of list, or search */
if (!search) {
hostname = url_store_match_hostname(url, hostname);
if (!hostname)
return NULL;
} else if ((search->data.visits > 0) &&
(search->data.requests > 0)){
/* straight match */
if ((search->data.url_length >= url_length) &&
(!strncmp(search->data.url, url,
url_length))) {
*reference = search;
return search->data.url;
}
/* try with 'www.' inserted after the scheme */
if (www_test && ((search->data.url_length - 4) >=
url_length) &&
(!strncmp(search->data.url,
url_store_match_scheme,
scheme_length)) &&
(!strncmp(search->data.url + scheme_length + 3,
"www.", 4)) &&
(!strncmp(search->data.url + scheme_length + 7,
url + scheme_length + 3,
url_length - scheme_length - 3))) {
*reference = search;
return search->data.url;
}
}
}
return NULL;
}
/**
* Converts a text string into one suitable for URL matching.
*
* \param text the text to search with
* \return URL matching string allocated on heap, or NULL on error
*/
char *url_store_match_string(const char *text) {
url_func_result res;
char *url;
assert(text);
res = url_normalize(text, &url);
if (res != URL_FUNC_OK)
return NULL;
/* drop the '/' from the end if it was added when normalizing */
if ((url[strlen(url) - 1] == '/') && (text[strlen(text) - 1] != '/'))
url[strlen(url) - 1] = '\0';
return url;
}
/**
* Loads the current contents of the URL store to disk
*
* \param file the file to load options from
*/
void url_store_load(const char *file) {
struct url_content *url;
char s[MAXIMUM_URL_LENGTH];
struct hostname_data *hostname;
struct url_data *result;
int urls;
int i;
int version;
int width, height, size;
FILE *fp;
fp = fopen(file, "r");
if (!fp) {
LOG(("Failed to open file '%s' for reading", file));
return;
}
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
return;
version = atoi(s);
if ((version < 100) || (version > 102))
return;
/* version 100 file is sequences of <url><visits><requests> */
if (version == 100) {
while (fgets(s, MAXIMUM_URL_LENGTH, fp)) {
if (s[strlen(s) - 1] == '\n')
s[strlen(s) - 1] = '\0';
url = url_store_find(s);
if (!url)
break;
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
url->visits = atoi(s);
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
url->requests = atoi(s);
}
} else if (version >= 101) {
/* version 102 is as 101, but with thumbnail information */
/* version 101 is as 100, but in hostname chunks, pre-sorted
* in reverse alphabetical order */
while (fgets(s, MAXIMUM_URL_LENGTH, fp)) {
if (s[strlen(s) - 1] == '\n')
s[strlen(s) - 1] = '\0';
hostname = url_store_find_hostname(s);
if (!hostname)
break;
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
urls = atoi(s);
for (i = 0; i < urls; i++) {
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
if (s[strlen(s) - 1] == '\n')
s[strlen(s) - 1] = '\0';
result = calloc(sizeof(struct url_data), 1);
if (!result)
break;
result->data.url_length = strlen(s);
result->data.url = malloc(result->
data.url_length + 1);
if (!result->data.url) {
free(result);
break;
}
strcpy(result->data.url, s);
result->parent = hostname;
result->next = hostname->url;
if (hostname->url)
hostname->url->previous = result;
hostname->url = result;
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
result->data.visits = atoi(s);
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
result->data.requests = atoi(s);
if (version == 102) {
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
size = atoi(s);
width = size & 65535;
height = size >> 16;
if (!fgets(s, MAXIMUM_URL_LENGTH, fp))
break;
#ifdef riscos
if (s[strlen(s) - 1] == '\n')
s[strlen(s) - 1] = '\0';
result->data.thumbnail =
bitmap_create_file(
width, height, s);
#endif
}
}
}
}
fclose(fp);
}
/**
* Saves the current contents of the URL store to disk
*
* \param file the file to load options from
*/
void url_store_save(const char *file) {
struct hostname_data *search;
struct url_data *url;
int url_count;
char *normal = NULL;
const char *thumb_file = "";
int thumb_size = 0;
FILE *fp;
struct bitmap *bitmap;
fp = fopen(file, "w");
if (!fp) {
LOG(("Failed to open file '%s' for writing", file));
return;
}
/* file format version number */
fprintf(fp, "102\n");
for (search = url_store_hostnames; search && search->next;
search = search->next);
for (; search; search = search->previous) {
url_count = 0;
for (url = search->url; url; url = url->next)
if ((url->data.visits > 0) &&
(strlen(url->data.url) <
MAXIMUM_URL_LENGTH))
url_count++;
free(normal);
normal = url_store_match_string(search->hostname);
if ((url_count > 0) && (normal)) {
fprintf(fp, "%s\n%i\n", normal, url_count);
for (url = search->url; url->next; url = url->next);
for (; url; url = url->previous)
if ((url->data.visits > 0) &&
(strlen(url->data.url) <
MAXIMUM_URL_LENGTH)) {
#ifdef riscos
bitmap = url->data.thumbnail;
if (bitmap) {
thumb_size = bitmap->width |
(bitmap->height << 16);
thumb_file = bitmap->filename;
} else {
thumb_size = 0;
thumb_file = "";
}
#endif
fprintf(fp, "%s\n%i\n%i\n%i\n%s\n",
url->data.url,
url->data.visits,
url->data.requests,
thumb_size,
thumb_file);
}
}
}
fclose(fp);
}
/**
* Dumps the currently stored URLs and hostnames to stderr.
*/
void url_store_dump(void) {
struct hostname_data *search;
struct url_data *url;
fprintf(stderr, "\nDumping hostname data:\n");
for (search = url_store_hostnames; search; search = search->next) {
fprintf(stderr, "\n");
fprintf(stderr, "%s", search->hostname);
fprintf(stderr, ":\n");
for (url = search->url; url; url = url->next) {
fprintf(stderr, " - ");
fprintf(stderr, "%s", url->data.url);
fprintf(stderr, "\n");
}
}
fprintf(stderr, "\nEnd of hostname data.\n\n");
}
void url_store_add_thumbnail(const char *url, struct bitmap *bitmap) {
struct url_content *content;
content = url_store_find(url);
if (content) {
if (content->thumbnail)
bitmap_destroy(content->thumbnail);
content->thumbnail = bitmap;
}
}
struct bitmap *url_store_get_thumbnail(const char *url) {
struct url_content *content;
content = url_store_find(url);
if (content)
return content->thumbnail;
return NULL;
}
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