static int
first_marker (void)
{
int c1, c2;
c1 = NEXTBYTE();
c2 = NEXTBYTE();
if (c1 != 0xFF || c2 != M_SOI)
ERREXIT("Not a JPEG file");
return c2;
}
/* All 2-byte quantities in JPEG markers are MSB first */
static unsigned int
read_2_bytes (void)
{
int c1, c2;
c1 = NEXTBYTE();
if (c1 == EOF)
ERREXIT("Premature EOF in JPEG file");
c2 = NEXTBYTE();
if (c2 == EOF)
ERREXIT("Premature EOF in JPEG file");
return (((unsigned int) c1) << 8) + ((unsigned int) c2);
}
/* All 2-byte quantities in JPEG markers are MSB first */
static unsigned int
read_2_bytes (void)
{
int c1, c2;
c1 = NEXTBYTE();
if (c1 == EOF) { read_byte_error_while_reading=1; return 0; }
//ERREXIT("Premature EOF in JPEG file");
c2 = NEXTBYTE();
if (c2 == EOF) { read_byte_error_while_reading=1; return 0; }
//ERREXIT("Premature EOF in JPEG file");
return (((unsigned int) c1) << 8) + ((unsigned int) c2);
}
/* Read one byte, testing for EOF */
static int
read_1_byte (void)
{
int c;
c = NEXTBYTE();
if (c == EOF)
ERREXIT("Premature EOF in JPEG file");
return c;
}
/* Read one byte, testing for EOF */
static int
read_1_byte (void)
{
int c;
c = NEXTBYTE();
if (c == EOF) { read_byte_error_while_reading=1; return 0; }
//ERREXIT("Premature EOF in JPEG file");
return c;
}
