shithub: riscv

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file: detect tga images

--- a/sys/src/cmd/file.c

+++ b/sys/src/cmd/file.c

@@ -150,6 +150,7 @@

 int	isrfc822(void);

 int	ismbox(void);

 int	islimbo(void);

+int	istga(void);

 int	ismp3(void);

 int	ismung(void);

 int	isp9bit(void);

@@ -196,6 +197,7 @@

 	ismsdos,	/* msdos exe (virus file attachement) */

 	isicocur,		/* windows icon or cursor file */

 	isface,		/* ascii face file */

+	istga,

 	ismp3,

 	/* last resorts */

@@ -1194,6 +1196,26 @@

 	if(wfreq[Aword] < 2)

 		return 0;

 	print("%s\n", mime ? PLAIN : "as program");

+	return 1;

+}

+

+int

+istga(void)

+{

+	uchar *p;

+

+	p = buf;

+	if(nbuf < 14)

+		return 0;

+	if(((p[2]|(1<<3)) & (~3)) != (1<<3))	/* rle flag */

+		return 0;

+	if(p[1] == 0 && ((p[2]&3) != 2 && (p[2]&3) != 3))	/* non color-mapped */

+		return 0;

+	if(p[1] == 1 && ((p[2]&3) != 1 || p[7] == 0))	/* color-mapped */

+		return 0;

+	if(p[16] != 8 && p[16] != 16 && p[16] != 24 && p[16] != 32)	/* bpp */

+		return 0;

+	print("%s\n", mime ? "image/tga" : "targa image");

 	return 1;

 }