/*********************
导航栏执行
参数:pback 返回键函数指针
pmenu 菜单键函数指针
**********************/
void guiddo(void (*pback)(void),void (*pmenu)(void),x)
{
if(x<80&&x>0) {Show_Str(20,288,"←",32,White,Blue);pback();}
if(x>80&&x<160) {Show_Str(104,288,"█",32,0xa254,Blue);LCD_DrawLine( 108, 304, 131,304, White );
LCD_DrawLine( 120, 293, 120,315, White );LCD_DrawLine( 80, 288, 80,320, White );desktop();}
if(x>160&&x<240){ Show_Str(187,288,"〓",32,White,Blue);pmenu();}
}
static int
get_arc(void)
{
int i;
int hdsz = 0;
int res;
int minhd = BLKMULT;
char *hdend;
int notice = 0;
/*
* find the smallest header size in all archive formats and then set up
* to read the archive.
*/
for (i = 0; ford[i] >= 0; ++i) {
if (fsub[ford[i]].hsz < minhd)
minhd = fsub[ford[i]].hsz;
}
if (rd_start() < 0)
return -1;
res = BLKMULT;
hdsz = 0;
hdend = hdbuf;
for(;;) {
for (;;) {
/*
* fill the buffer with at least the smallest header
*/
i = rd_wrbuf(hdend, res);
if (i > 0)
hdsz += i;
if (hdsz >= minhd)
break;
/*
* if we cannot recover from a read error quit
*/
if ((i == 0) || (rd_sync() < 0))
goto out;
/*
* when we get an error none of the data we already
* have can be used to create a legal header (we just
* got an error in the middle), so we throw it all out
* and refill the buffer with fresh data.
*/
res = BLKMULT;
hdsz = 0;
hdend = hdbuf;
if (!notice) {
if (act == APPND)
return -1;
tty_warn(1,
"Cannot identify format. Searching...");
++notice;
}
}
/*
* we have at least the size of the smallest header in any
* archive format. Look to see if we have a match. The array
* ford[] is used to specify the header id order to reduce the
* chance of incorrectly id'ing a valid header (some formats
* may be subsets of each other and the order would then be
* important).
*/
for (i = 0; ford[i] >= 0; ++i) {
if ((*fsub[ford[i]].id)(hdbuf, hdsz) < 0)
continue;
frmt = &(fsub[ford[i]]);
/*
* yuck, to avoid slow special case code in the extract
* routines, just push this header back as if it was
* not seen. We have left extra space at start of the
* buffer for this purpose. This is a bit ugly, but
* adding all the special case code is far worse.
*/
pback(hdbuf, hdsz);
return 0;
}
/*
* We have a flawed archive, no match. we start searching, but
* we never allow additions to flawed archives
*/
if (!notice) {
if (act == APPND)
return -1;
tty_warn(1, "Cannot identify format. Searching...");
++notice;
}
/*
* brute force search for a header that we can id.
* we shift through byte at a time. this is slow, but we cannot
* determine the nature of the flaw in the archive in a
* portable manner
*/
if (--hdsz > 0) {
memmove(hdbuf, hdbuf+1, hdsz);
res = BLKMULT - hdsz;
hdend = hdbuf + hdsz;
} else {
res = BLKMULT;
hdend = hdbuf;
hdsz = 0;
}
}
out:
/*
* we cannot find a header, bow, apologize and quit
*/
tty_warn(1, "Sorry, unable to determine archive format.");
return -1;
}
