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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
/*
* appcast.c
* Copyright (C) John Stebbins 2008-2011 <stebbins@stebbins>
*
* appcast.c is free software.
*
* You may redistribute it and/or modify it under the terms of the
* GNU General Public License, as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#include <stdio.h>
#include <string.h>
#include <glib.h>
#include <glib/gstdio.h>
#include "icon_tools.h"
#include "plist.h"
#include "values.h"
enum
{
A_NONE = 0,
A_DESCRIPTION,
A_ENCLOSURE,
A_ITEM,
};
typedef struct
{
gchar *tag;
gint id;
} tag_map_t;
static tag_map_t tag_map[] =
{
{"sparkle:releaseNotesLink", A_DESCRIPTION},
{"enclosure", A_ENCLOSURE},
{"item", A_ITEM},
};
#define TAG_MAP_SZ (sizeof(tag_map)/sizeof(tag_map_t))
typedef struct
{
gchar *key;
gchar *value;
GQueue *stack;
GQueue *tag_stack;
GString *description;
gchar *build;
gchar *version;
gboolean item;
} parse_data_t;
static const gchar*
lookup_attr_value(
const gchar *name,
const gchar **attr_names,
const gchar **attr_values)
{
gint ii;
if (attr_names == NULL) return NULL;
for (ii = 0; attr_names[ii] != NULL; ii++)
{
if (strcmp(name, attr_names[ii]) == 0)
return attr_values[ii];
}
return NULL;
}
static void
start_element(
GMarkupParseContext *ctx,
const gchar *tag,
const gchar **attr_names,
const gchar **attr_values,
gpointer ud,
GError **error)
{
parse_data_t *pd = (parse_data_t*)ud;
union
{
gint id;
gpointer pid;
} id;
gint ii;
for (ii = 0; ii < TAG_MAP_SZ; ii++)
{
if (strcmp(tag, tag_map[ii].tag) == 0)
{
id.id = tag_map[ii].id;
break;
}
}
if (ii == TAG_MAP_SZ)
{
g_debug("Unrecognized start tag (%s)", tag);
id.id = A_NONE;
}
g_queue_push_head(pd->tag_stack, id.pid);
switch (id.id)
{
case A_ITEM:
{
pd->item = TRUE;
} break;
case A_ENCLOSURE:
{
const gchar *build, *version;
build = lookup_attr_value(
"sparkle:version", attr_names, attr_values);
version = lookup_attr_value(
"sparkle:shortVersionString", attr_names, attr_values);
if (build)
pd->build = g_strdup(build);
if (version)
pd->version = g_strdup(version);
} break;
}
}
static void
end_element(
GMarkupParseContext *ctx,
const gchar *tag,
gpointer ud,
GError **error)
{
parse_data_t *pd = (parse_data_t*)ud;
gint id;
union
{
gint id;
gpointer pid;
} start_id;
gint ii;
for (ii = 0; ii < TAG_MAP_SZ; ii++)
{
if (strcmp(tag, tag_map[ii].tag) == 0)
{
id = tag_map[ii].id;
break;
}
}
if (ii == TAG_MAP_SZ)
{
g_debug("Unrecognized end tag (%s)", tag);
id = A_NONE;
}
start_id.pid = g_queue_pop_head(pd->tag_stack);
if (start_id.id != id)
g_warning("start tag != end tag: (%s %d) %d", tag, start_id.id, id);
switch (id)
{
case A_ITEM:
{
pd->item = FALSE;
} break;
default:
{
} break;
}
}
static void
text_data(
GMarkupParseContext *ctx,
const gchar *text,
gsize len,
gpointer ud,
GError **error)
{
parse_data_t *pd = (parse_data_t*)ud;
union
{
gint id;
gpointer pid;
} start_id;
start_id.pid = g_queue_peek_head(pd->tag_stack);
switch (start_id.id)
{
case A_DESCRIPTION:
{
if (pd->item)
{
g_string_append(pd->description, text);
}
} break;
default:
{
if (pd->value) g_free(pd->value);
pd->value = g_strdup(text);
} break;
}
}
static void
passthrough(
GMarkupParseContext *ctx,
const gchar *text,
gsize len,
gpointer ud,
GError **error)
{
//parse_data_t *pd = (parse_data_t*)ud;
//g_debug("passthrough %s", text);
}
static void
parse_error(GMarkupParseContext *ctx, GError *error, gpointer ud)
{
g_warning("Resource parse error: %s", error->message);
}
// This is required or the parser crashes
static void
destroy_notify(gpointer data)
{ // Do nothing
//g_debug("destroy parser");
}
void
ghb_appcast_parse(gchar *buf, gchar **desc, gchar **build, gchar **version)
{
GMarkupParseContext *ctx;
GMarkupParser parser;
parse_data_t pd;
GError *err = NULL;
gint len;
gchar *start;
//gchar tmp[4096]
// Skip junk at beginning of buffer
start = strstr(buf, "<?xml ");
pd.description = g_string_new("");
pd.item = FALSE;
pd.build = NULL;
pd.version = NULL;
len = strlen(start);
pd.tag_stack = g_queue_new();
pd.key = NULL;
pd.value = NULL;
parser.start_element = start_element;
parser.end_element = end_element;
parser.text = text_data;
parser.passthrough = passthrough;
parser.error = parse_error;
ctx = g_markup_parse_context_new(
&parser, G_MARKUP_TREAT_CDATA_AS_TEXT, &pd, destroy_notify);
g_markup_parse_context_parse(ctx, start, len, &err);
g_markup_parse_context_end_parse(ctx, &err);
g_markup_parse_context_free(ctx);
g_queue_free(pd.tag_stack);
*desc = g_string_free(pd.description, FALSE);
// work around a bug to leaves the CDATA closing brakets on the string
gchar *glitch;
glitch = g_strrstr(*desc, "]]>");
if (glitch)
*glitch = 0;
*build = pd.build;
*version = pd.version;
}
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