src/protocols/qq/utils.c

/**
 * The QQ2003C protocol plugin
 *
 * for gaim
 *
 * Copyright (C) 2004 Puzzlebird
 *
 * This program is free software; you can 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.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU 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
 */

// START OF FILE
/*****************************************************************************/
#include "stdlib.h"		// strtol
#include "limits.h"
#include "string.h"		// strlen

#ifdef _WIN32
#include "win32dep.h"
#endif

#include "debug.h"		// gaim_debug
#include "utils.h"
#include "char_conv.h"		// qq_to_utf8
#include "prefs.h"		// gaim_prefs_get_string

#define QQ_NAME_FORMAT    "qq-%d"

#ifndef g_str_has_prefix
gint g_str_has_prefix(const gchar *str, const gchar *prefix)
{
	gint len = strlen(prefix);
	return !strncmp(str, prefix, len);
}
#endif

/*****************************************************************************/
gchar *get_name_by_index_str(gchar ** array, const gchar * index_str, gint amount) {
	gint index;

	index = atoi(index_str);
	if (index < 0 || index >= amount)
		index = 0;

	return array[index];
}				// get_name_by_index_str

/*****************************************************************************/
gchar *get_index_str_by_name(gchar ** array, const gchar * name, gint amount) {
	gint index;

	for (index = 0; index <= amount; index++)
		if (g_ascii_strcasecmp(array[index], name) == 0)
			break;

	if (index >= amount)
		index = 0;	// meaning no match
	return g_strdup_printf("%d", index);
}				// get_index_str_by_name

/*****************************************************************************/
gint qq_string_to_dec_value(const gchar * str)
{
	g_return_val_if_fail(str != NULL, 0);
	return strtol(str, NULL, 10);
}				// _qq_string_to_dec_value

/*****************************************************************************/
// split the given data(len) with delimit,
// check the number of field matches the expected_fields (<=0 means all)
// return gchar* array (needs to be freed by g_strfreev later), or NULL
gchar **split_data(guint8 * data, gint len, const gchar * delimit, gint expected_fields) {

	guint8 *input;
	gchar **segments;
	gint i, j;

	g_return_val_if_fail(data != NULL && len != 0 && delimit != 0, NULL);

	// as the last field would be string, but data is not ended with 0x00
	// we have to duplicate the data and append a 0x00 at the end
	input = g_newa(guint8, len + 1);
	g_memmove(input, data, len);
	input[len] = 0x00;

	segments = g_strsplit(input, delimit, 0);
	if (expected_fields <= 0)
		return segments;

	for (i = 0; segments[i] != NULL; i++) {;
	}
	if (i < expected_fields) {	// not enough fields
		gaim_debug(GAIM_DEBUG_ERROR, "QQ",
			   "Invalid data, expect %d fields, found only %d, discard\n", expected_fields, i);
		g_strfreev(segments);
		return NULL;
	} else if (i > expected_fields) {	// more fields, OK
		gaim_debug(GAIM_DEBUG_WARNING, "QQ",
			   "Dangerous data, expect %d fields, found %d, return all\n", expected_fields, i);
		// free up those not used
		for (j = expected_fields; j < i; j++) {
			gaim_debug(GAIM_DEBUG_WARNING, "QQ", "field[%d] is %s\n", j, segments[j]);
			g_free(segments[j]); // bug found by gfhuang ! i -> j
		}
		
		segments[expected_fields] = NULL;
	}			// if i

	return segments;
}				// split_data

/*****************************************************************************/
// given a four-byte ip data, convert it into a human readable ip string
// the return needs to be freed
gchar *gen_ip_str(guint8 * ip)
{
	if (ip == NULL || ip[0] == 0)
	       	return g_strdup_printf("");
	else 
		return g_strdup_printf("%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
}

// by gfhuang
guint8 *str_ip_gen(gchar *str) {
	guint8 *ip = g_new(guint8, 4);
	int a, b, c, d;
	sscanf(str, "%d.%d.%d.%d", &a, &b, &c, &d);
	ip[0] = a;
	ip[1] = b;
	ip[2] = c;
	ip[3] = d;
	return ip;
}

/*****************************************************************************/
// return the QQ icon file name
// the return needs to be freed
gchar *get_icon_name(gint set, gint suffix)
{
	return g_strdup_printf("qq_%d-%d", set, suffix);
}				// get_icon_name

/*****************************************************************************/
// convert a QQ UID to a unique name of GAIM
// the return needs to be freed
gchar *uid_to_gaim_name(guint32 uid)
{
	return g_strdup_printf(QQ_NAME_FORMAT, uid);
}				// uid_to_gaim_name

/*****************************************************************************/
// convert GAIM name to original QQ UID
guint32 gaim_name_to_uid(const gchar * name)
{
	gchar *p;

	g_return_val_if_fail(g_str_has_prefix(name, QQ_NAME_PREFIX), 0);

	p = g_strrstr(name, QQ_NAME_PREFIX);
	// atoi is not thread-safe and also not async-cancel safe
	// atoi is deprecated by strtol() and should not be used in new code
	return (p == NULL) ? 0 : strtol(p + strlen(QQ_NAME_PREFIX), NULL, 10);
}

/*****************************************************************************/
// try to dump the data as GBK
void try_dump_as_gbk(guint8 * data, gint len)
{
	gint i;
	guint8 *incoming;
	gchar *msg_utf8;

	incoming = g_newa(guint8, len + 1);
	g_memmove(incoming, data, len);
	incoming[len] = 0x00;
	// GBK code: 
	// Single-byte ASCII:      0x21-0x7E
	// GBK first byte range:   0x81-0xFE
	// GBK second byte range:  0x40-0x7E and 0x80-0xFE
	for (i = 0; i < len; i++)
		if (incoming[i] >= 0x81)
			break;

	msg_utf8 = i < len ? qq_to_utf8(&incoming[i], QQ_CHARSET_DEFAULT) : NULL;

	if (msg_utf8 != NULL) {
		gaim_debug(GAIM_DEBUG_WARNING, "QQ", "Try extract GB msg: %s\n", msg_utf8);
		g_free(msg_utf8);
	}			// msg_utf8 != NULL
}				// try_dump_gbk

/*****************************************************************************/

// dump a chunk of raw data into hex string
// the return should be freed later
gchar *hex_dump_to_str(const guint8 * buffer, gint bytes)
{
	GString *str;
	gchar *ret;
	gint i, j, ch;

	str = g_string_new("");
	for (i = 0; i < bytes; i += 16) {
		// length label
		g_string_append_printf(str, "%04d: ", i);

		// dump hex value
		for (j = 0; j < 16; j++)
			if ((i + j) < bytes)
				g_string_append_printf(str, " %02X", buffer[i + j]);
			else
				g_string_append(str, "   ");
		g_string_append(str, "  ");

		// dump ascii value
		for (j = 0; j < 16 && (i + j) < bytes; j++) {
			ch = buffer[i + j] & 127;
			if (ch < ' ' || ch == 127)
				g_string_append_c(str, '.');
			else
				g_string_append_c(str, ch);
		}
		g_string_append_c(str, '\n');
	}

	ret = str->str;
	// GString can be freed without freeing it character data
	g_string_free(str, FALSE);

	return ret;
}

/*****************************************************************************/
// ENF OF FILE