/* Compute a signed quad that must be positive */
uint32_t get_positive_quad (FILE *file, const char *type, const char *name)
{
int32_t val = get_signed_quad (file);
if (val < 0)
ERROR ("Bad %s: negative %s: %d", type, name, val);
return (uint32_t)val;
}
static int
read_pk_char_header (struct pk_header_ *h, unsigned char opcode, FILE *fp)
{
ASSERT(h);
if ((opcode & 4) == 0) { /* short */
h->pkt_len = (opcode & 3) * 0x100U + get_unsigned_byte(fp);
h->chrcode = get_unsigned_byte(fp);
h->wd = get_unsigned_triple(fp); /* TFM width */
h->dx = get_unsigned_byte(fp) << 16; /* horizontal escapement */
h->dy = 0L;
h->bm_wd = get_unsigned_byte(fp);
h->bm_ht = get_unsigned_byte(fp);
h->bm_hoff = get_signed_byte(fp);
h->bm_voff = get_signed_byte(fp);
h->pkt_len -= 8;
} else if ((opcode & 7) == 7) { /* long */
h->pkt_len = get_unsigned_quad(fp);
h->chrcode = get_signed_quad(fp);
h->wd = get_signed_quad(fp);
h->dx = get_signed_quad(fp); /* 16.16 fixed point number in pixels */
h->dy = get_signed_quad(fp);
h->bm_wd = get_signed_quad(fp);
h->bm_ht = get_signed_quad(fp);
h->bm_hoff = get_signed_quad(fp);
h->bm_voff = get_signed_quad(fp);
h->pkt_len -= 28;
} else { /* extended short */
h->pkt_len = (opcode & 3) * 0x10000UL + get_unsigned_pair(fp);
h->chrcode = get_unsigned_byte(fp);
h->wd = get_unsigned_triple(fp);
h->dx = get_unsigned_pair(fp) << 16;
h->dy = 0x0L;
h->bm_wd = get_unsigned_pair(fp);
h->bm_ht = get_unsigned_pair(fp);
h->bm_hoff = get_signed_pair(fp);
h->bm_voff = get_signed_pair(fp);
h->pkt_len -= 13;
}
h->dyn_f = opcode / 16;
h->run_color = (opcode & 8) ? 1 : 0;
if (h->chrcode > 0xff)
{
WARN("Unable to handle long characters in PK files: code=0x%04x", h->chrcode);
return -1;
}
return 0;
}
