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/*
* Input bytes from the dvi file or the current virtual character.
* These routines could probably be sped up significantly; but they are
* very machine dependent, so I will leave such tuning to the installer.
* They simply get and return bytes in batches of one, two, three, and four,
* updating the current position as necessary.
*/
#include "dvips.h" /* The copyright notice in that file is included too! */
/*
* The external declarations:
*/
#include "protos.h"
static void
abortpage(void)
{
error("! unexpected eof on DVI file");
}
shalfword /* the value returned is, however, between 0 and 255 */
dvibyte(void)
{
register shalfword i;
if (curpos) {
if (curpos>=curlim) return((shalfword)140);
return (*curpos++);
}
if ((i=getc(dvifile))==EOF)
abortpage();
return(i);
}
halfword
twobytes(void)
{
register halfword i;
i = dvibyte();
return(i*256+dvibyte()); }
integer
threebytes(void)
{
register integer i;
i = twobytes();
return(i*256+dvibyte()); }
shalfword
signedbyte(void)
{
register shalfword i;
if (curpos) {
if (curpos>=curlim)
error("! unexpected end of virtual packet");
i = *curpos++;
} else if ((i=getc(dvifile))==EOF)
abortpage();
if (i<128) return(i);
else return(i-256);
}
shalfword
signedpair(void)
{
register shalfword i;
i = signedbyte();
return(i*256+dvibyte());
}
integer
signedtrio(void)
{
register integer i;
i = signedpair();
return(i*256+dvibyte());
}
integer
signedquad(void)
{
register integer i;
i = signedpair();
return(i*65536+twobytes());
}
void
skipover(int i)
{
while (i-->0) dvibyte();
}
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