> Does anything besides ConTeXt use dvipos?
Googling for the specials that dvipos parses, such as pos:pxywhd,
produces one hit and it's on the ntg-context list. So it's a safe bet
that ConTeXt is the only user.
> If not, then Sanjoys patch that simply adds "sp" after each number
> seems fine to me.
It's necessary but not sufficient, since dvipos still won't be able to
parse the specials that (Con)TeX(t) writes because those are in pt, and
have 'pt' appended. Therefore the second patch that I sent is also
needed. It's not perfect since it doesn't fix sscanfing 'list' in
dvicore.c:do_pos_special().
But I just figured out what list's format should be and what to do about
it. Assuming again that ConTeXt is the only user of those specials, the
relevant code is from core-pos.tex (line 525ff):
\def\doregisterparoptions
{\doglobal\increment\parposcounter
\begingroup
\leftskip 1\leftskip
\rightskip1\rightskip
\setpositiondataplus
{p:\parposcounter}% % identifier
{\the\zeropoint}%
{\the\strutht}%
{\the\strutdp}%
{\the\hsize ,% 1
\the\leftskip ,% 2
\the\rightskip ,% 3
\the\hangindent,% 4
\the\hangafter ,% 5 (num)
\the\parindent }% 6
%\normalhbox{\registerparsymbol}%
\registerparsymbol
\endgroup}
If list needs to be extracted from the pos:pxyplus special, which is the
only one that uses it, its format will be like:
469.75499pt,0.0pt,0.0pt,0.0pt,1,20.0pt
That string needs %fpt,%fpt,%fpt,%fpt,%ld,%fpt as its scanf format.
do_pos_special() instead sscanf's list as %ld, which will pick up just
the 469. So here is the third patch (and the dvicore.c with all three
patches is attached).
I tested the result and it still works with pos:pxywhd, and I compiled
it with -Wformat=2 just to make sure I hadn't screwed up a sscanf or
fprintf format string. But I don't have a dvi file that uses
pos:pxyplus, so I can't test the new code path.
Hans,
Could you make a minimal .tex file that would use pos:pxyplus?
-Sanjoy
`A nation of slaves is always prepared to applaud the clemency of their
master who, in the abuse of absolute power, does not proceed to the
last extremes of injustice and oppression.' (Gibbon)
changeset: 3:36f5c3fd455c
tag: tip
user: Sanjoy Mahajan <[EMAIL PROTECTED]>
date: Sun Jan 07 14:34:34 2007 -0500
summary: do_pos_special(): 'list' needs to be parsed as a structure
diff -r f30b6ea9f33e -r 36f5c3fd455c dvicore.c
--- a/dvicore.c Sat Jan 06 21:45:10 2007 -0500
+++ b/dvicore.c Sun Jan 07 14:34:34 2007 -0500
@@ -896,7 +896,15 @@ static void do_pos_special (unsigned cha
static void do_pos_special (unsigned char *buffer, SIGNED_QUAD buffer_len)
{
unsigned char *cmd, *tag, *p;
- SIGNED_QUAD x, y, w, h, d, list;
+ SIGNED_QUAD x, y, w, h, d;
+ double w_pt, h_pt, d_pt; /* in pt */
+ int parsed = 0; /* how many conversions the sscanf managed */
+
+ struct /* see \doregisterparoptions in ConTeXt's core-pos.tex */
+ {
+ double hsize, leftskip, rightskip, hangindent, parindent;
+ SIGNED_QUAD hangafter;
+ } list;
for (p = buffer; p - buffer < buffer_len && isspace(*p); p++)
; /* skip white chars */
@@ -919,13 +927,15 @@ static void do_pos_special (unsigned cha
; /* skip white chars */
if (p - buffer < buffer_len)
{
- float w_f, h_f, d_f; /* in pt */
- /* what the hell is list? */
- sscanf(p, "%fpt %fpt %fpt %ld", &w_f, &h_f, &d_f, &list);
- /* convert to sp. Forget about rounding (add 0.5 if you want it). */
- w = w_f * 65536;
- h = h_f * 65536;
- d = d_f * 65536;
+ /* hangafter is a number, not a dimension, hence its %ld */
+ parsed = sscanf(p, "%lfpt %lfpt %lfpt %lfpt,%lfpt,%lfpt,%lfpt,%ld,%lfpt",
+ &w_pt, &h_pt, &d_pt,
+ &list.hsize, &list.leftskip, &list.rightskip,
+ &list.hangindent, &list.hangafter, &list.parindent);
+ /* convert pt to sp. Forget about rounding (add 0.5 if you want it). */
+ w = w_pt * 65536;
+ h = h_pt * 65536;
+ d = d_pt * 65536;
}
x = dvi_state.h + denominator / 100;
@@ -935,8 +945,14 @@ static void do_pos_special (unsigned cha
fprintf(outfp, "\\pospxy{%s}{%d}{%ldsp}{%ldsp}\n", tag, current_page, x,
y);
else if (strcmp(cmd, "pos:pxywhd") == 0)
fprintf(outfp, "\\pospxywhd{%s}{%d}{%ldsp}{%ldsp}{%ldsp}{%ldsp}{%ldsp}\n",
tag, current_page, x, y, w, h, d);
- else if (strcmp(cmd, "pos:pxyplus") == 0)
- fprintf(outfp,
"\\pospxyplus{%s}{%d}{%ldsp}{%ldsp}{%ldsp}{%ldsp}{%ldsp}{%ld}\n", tag,
current_page, x, y, w, h, d, list);
+ else if (strcmp(cmd, "pos:pxyplus") == 0) {
+ if (parsed < 9)
+ fprintf(stderr, "dvipos: only %d conversions for \\pospxyplus but 9 are
needed\nBeward: Coordinates in the output may therefore be junk. Continuing
anyway...", parsed);
+ fprintf(outfp, "\\pospxyplus{%s}{%d}{%ldsp}{%ldsp}{%ldsp}{%ldsp}{%ldsp}",
tag, current_page, x, y, w, h, d);
+ fprintf(outfp, "{%lfpt,%lfpt,%lfpt,%lfpt,%ld,%lfpt}\n",
+ list.hsize, list.leftskip, list.rightskip,
+ list.hangindent, list.hangafter, list.parindent);
+ }
else if (strcmp(cmd, "pos:begbox") == 0)
new_bbox(tag, BOX_TYPE);
else if (strcmp(cmd, "pos:endbox") == 0)
/* $Header: /home/cvsroot/dvipos/dvicore.c,v 1.8 2003/06/28 05:43:40 chofchof Exp $
dvipos-20030628
Copyright (C) 2003 by Jin-Hwan <[EMAIL PROTECTED]>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "utils.h"
#include "dvicore.h"
#include "tfm.h"
#include <math.h>
#include <time.h>
/* Global variables */
int dvi_pages = 0;
/* Internal variables */
static FILE *dvi_file;
static SIGNED_QUAD dvi_fsize, dvi_location;
static SIGNED_QUAD post_location, post_post_location, *page_location = NULL;
static SIGNED_QUAD prev_page_location = -1;
static int current_page, new_dvi_pages = 0;
#define DVI_MAX_STACK_DEPTH 256
static int dvi_stack_depth = 0;
static struct dvi_register {
SIGNED_QUAD h, v, w, x, y, z, d, hh, vv;
} dvi_state, dvi_stack[DVI_MAX_STACK_DEPTH];
static int cur_font = -1, num_dvi_fonts = 0, max_dvi_fonts = 0;
static struct dvi_font {
SIGNED_QUAD size, id; /* size == scaled_size */
int tfm_id, used; char *name;
} *dvi_fonts = NULL;
static SIGNED_QUAD numerator, denominator, dvi_mag, new_mag, mag;
static double tfm_conv, true_conv, conv, resolution;
static UNSIGNED_BYTE id;
static SIGNED_QUAD max_v, max_h, max_v_so_far, max_h_so_far;
static SIGNED_PAIR max_s, total_pages;
static SIGNED_PAIR max_s_so_far, page_count;
typedef struct a_bbox {
SIGNED_QUAD h1, v1, h2, v2, fb, cb; /* first and current baseline */
int type, lev_s;
unsigned char *tag;
struct a_bbox *next;
} BBOX;
static BBOX page_bbox;
static char comment[257];
/* Internal buffer */
#define DVI_BUFFER_SIZE 1024
static int dvi_buffer_len = 0;
static unsigned char dvi_buffer[DVI_BUFFER_SIZE];
static void calc_bbox (SIGNED_QUAD width, SIGNED_QUAD height, SIGNED_QUAD depth)
{
BBOX *bb = &page_bbox;
if (do_smashchars) height = depth = 0;
while (bb) {
if (bb->fb == -INFINITY) bb->fb = dvi_state.v;
bb->cb = dvi_state.v;
if (bb->h1 > dvi_state.h) bb->h1 = dvi_state.h;
if (bb->v1 > dvi_state.v - height) bb->v1 = dvi_state.v - height;
if (bb->h2 < dvi_state.h + width) bb->h2 = dvi_state.h + width;
if (bb->v2 < dvi_state.v + depth) bb->v2 = dvi_state.v + depth;
bb = bb->next;
}
}
#define PAGE_TYPE 0
#define BOX_TYPE 1
#define LINES_TYPE 2
#define LINES_TYPE_SUSPEND 3
static void draw_frame (BBOX *bb)
{
SIGNED_QUAD width, height;
width = bb->h2 - bb->h1 + 2 * rule_width;
height = bb->v2 - bb->v1 + 2 * rule_width;
/* color special */
put_unsigned_byte(XXX1, frmfp);
put_unsigned_byte(20, frmfp);
switch (bb->type) {
case BOX_TYPE:
fwrite("color push rgb 0 1 0", 1, 20, frmfp);
break;
case LINES_TYPE:
fwrite("color push rgb 0 0 1", 1, 20, frmfp);
break;
case PAGE_TYPE:
default:
fwrite("color push rgb 1 0 0", 1, 20, frmfp);
break;
}
dbg_location += 20;
/* push the current state */
put_unsigned_byte(PUSH, frmfp);
/* move to ll corner plus (-rule_width,rule_width) */
put_unsigned_byte(RIGHT4, frmfp);
put_signed_quad(-dvi_state.h + bb->h1 - rule_width, frmfp);
put_unsigned_byte(DOWN4, frmfp);
put_signed_quad(-dvi_state.v + bb->v2 + rule_width, frmfp);
/* draw a horizontal line connecting ll corner to lr corner */
put_unsigned_byte(PUT_RULE, frmfp);
put_signed_quad(rule_width, frmfp);
put_signed_quad(width, frmfp);
/* draw a vertical line connecting ll corner to ul corner */
put_unsigned_byte(PUT_RULE, frmfp);
put_signed_quad(height, frmfp);
put_signed_quad(rule_width, frmfp);
/* push the location of ll corner */
put_unsigned_byte(PUSH, frmfp);
/* move to ul corner plus (-rule_width,0) */
put_unsigned_byte(DOWN4, frmfp);
put_signed_quad(-bb->v2 + bb->v1 - rule_width, frmfp);
/* draw a horizontal line connecting ul corner to ur corner */
put_unsigned_byte(PUT_RULE, frmfp);
put_signed_quad(rule_width, frmfp);
put_signed_quad(width, frmfp);
/* restore the location of ll corner */
put_unsigned_byte(POP, frmfp);
/* move to lr corner plus (0,rule_width) */
put_unsigned_byte(RIGHT4, frmfp);
put_signed_quad(-bb->h1 + bb->h2 + rule_width, frmfp);
/* draw a vertical line connecting ll corner to ul corner */
put_unsigned_byte(PUT_RULE, frmfp);
put_signed_quad(height, frmfp);
put_signed_quad(rule_width, frmfp);
/* restore the original location */
put_unsigned_byte(POP, frmfp);
/* restore color special */
put_unsigned_byte(XXX1, frmfp);
put_unsigned_byte(9, frmfp);
fwrite("color pop", 1, 9, frmfp);
dbg_location += 9;
}
static void reset_bbox (BBOX *bb)
{
bb->h1 = bb->v1 = INFINITY;
bb->h2 = bb->v2 = -INFINITY;
bb->fb = bb->cb = -INFINITY;
}
static void clear_bbox (int init)
{
/* calculate bounding box of each page */
reset_bbox(&page_bbox);
page_bbox.tag = "pagebb";
page_bbox.type = PAGE_TYPE;
if (init) page_bbox.next = NULL;
}
static void new_bbox (unsigned char *tag, int type)
{
BBOX *bb = &page_bbox;
while (bb->next) {
// if (strcmp(tag, (bb->next)->tag) == 0) {
// msg_out(M_WARNING, "Warning: Found an entry with the same tag (%s).\n", tag);
// return;
// }
bb = bb->next;
}
/* allocate a new entry */
bb = bb->next = (BBOX *)xmalloc(sizeof(BBOX));
bb->tag = xstrdup(tag);
bb->next = NULL;
bb->lev_s = dvi_stack_depth;
bb->type = type;
reset_bbox(bb);
if (bbxfp && bb->type == LINES_TYPE)
fprintf(bbxfp, "\n## KEY & TAG\nbeglines & \"%s\"\n", bb->tag);
}
static void write_bbox (BBOX *bb)
{
if (bbxfp) {
fprintf(bbxfp, "\"%d.%04X & ", (bb->fb / 65536), (bb->fb < 0 ? -1 : 1) * (bb->fb % 65536));
fprintf(bbxfp, "\"%d.%04X \"%d.%04X \"%d.%04X \"%d.%04X & ",
(bb->v1 / 65536), (bb->v1 < 0 ? -1 : 1) * (bb->v1 % 65536),
(bb->h1 / 65536), (bb->h1 < 0 ? -1 : 1) * (bb->h1 % 65536),
(bb->v2 / 65536), (bb->v2 < 0 ? -1 : 1) * (bb->v2 % 65536),
(bb->h2 / 65536), (bb->h2 < 0 ? -1 : 1) * (bb->h2 % 65536));
fprintf(bbxfp, "\"%d.%04X\n", (bb->cb / 65536), (bb->cb < 0 ? -1 : 1) * (bb->cb % 65536));
/*
fprintf(bbxfp, "\"%ld & ", bb->fb);
fprintf(bbxfp, "\"%ld \"%ld \"%ld \"%ld & ", bb->v1, bb->h1, bb->v2, bb->h2);
fprintf(bbxfp, "\"%ld\n", bb->cb);
*/
}
}
static void flush_bbox (BBOX *bb)
{
if (bb == NULL) return;
if (frmfp) draw_frame(bb);
if (bbxfp) {
switch (bb->type) {
case PAGE_TYPE:
fprintf(bbxfp, "\n## KEY & PAGENO & ENTRY-V & TOP-V LEFT-H BOTTOM-V RIGHT-H & EXIT-V\n");
fprintf(bbxfp, "%s & %d & ", "pagebb", current_page);
write_bbox(bb);
break;
case BOX_TYPE:
fprintf(bbxfp, "\n## KEY & TAG & ENTRY-V & TOP-V LEFT-H BOTTOM-V RIGHT-H & EXIT-V\n");
fprintf(bbxfp, "%s & \"%s\" & ", "box", bb->tag);
write_bbox(bb);
break;
case LINES_TYPE:
fprintf(bbxfp, " %s & ", "line");
write_bbox(bb);
break;
case LINES_TYPE_SUSPEND:
bb->type = LINES_TYPE;
fprintf(bbxfp, "\n[resume]lines & \"%s\"\n", bb->tag);
fprintf(bbxfp, " %s & ", "line");
write_bbox(bb);
default:
break;
}
}
}
static void close_bbox (char *tag)
{
BBOX *obb = &page_bbox, *nbb = obb->next;
/* find the entry with the same tag */
while (nbb)
if (strcmp(nbb->tag, tag) == 0) {
flush_bbox(nbb);
if (bbxfp && nbb->type == LINES_TYPE)
fprintf(bbxfp, "endlines & \"%s\"\n", nbb->tag);
free(nbb->tag);
obb->next = (nbb->next ? nbb->next : NULL);
free(nbb);
break;
} else {
if (bbxfp && nbb->type == LINES_TYPE) {
fprintf(bbxfp, "[suspend]lines & \"%s\"\n", nbb->tag);
nbb->type = LINES_TYPE_SUSPEND;
}
obb = nbb;
nbb = nbb->next;
}
}
static UNSIGNED_BYTE dvi_unsigned_byte (void)
{
dvi_location++;
return get_unsigned_byte(dvi_file);
}
static SIGNED_BYTE dvi_signed_byte (void)
{
dvi_location++;
return get_signed_byte(dvi_file);
}
static UNSIGNED_PAIR dvi_unsigned_pair (void)
{
dvi_location += 2;
return get_unsigned_pair(dvi_file);
}
static SIGNED_PAIR dvi_signed_pair (void)
{
dvi_location += 2;
return get_signed_pair(dvi_file);
}
static UNSIGNED_PAIR dvi_unsigned_triple (void)
{
dvi_location += 3;
return get_unsigned_triple(dvi_file);
}
static SIGNED_PAIR dvi_signed_triple (void)
{
dvi_location += 3;
return get_signed_triple(dvi_file);
}
static UNSIGNED_PAIR dvi_unsigned_quad (void)
{
dvi_location += 4;
return get_unsigned_quad(dvi_file);
}
static SIGNED_PAIR dvi_signed_quad (void)
{
dvi_location += 4;
return get_signed_quad(dvi_file);
}
static SIGNED_QUAD sqxfw (SIGNED_QUAD z, SIGNED_QUAD b)
{
SIGNED_QUAD alpha, beta, result;
UNSIGNED_BYTE b0, b1, b2, b3;
alpha = 16;
while (z >= 0x800000L) {
z = z / 2;
alpha = alpha + alpha;
}
beta = 256 / alpha;
alpha = alpha * z;
b0 = (b >> 24) & 0xFF; b1 = (b >> 16) & 0xFF;
b2 = (b >> 8) & 0xFF; b3 = b & 0xFF;
result = (((((b3 * z) / 0x100) + (b2 * z)) / 0x100) + (b1 * z)) / beta;
if (b0 == 0) return result;
else if (b0 == 255) return (result - alpha);
msg_out(M_FAIL, "[fatal] sqxfw(): TFM file is bad.\n");
}
static SIGNED_QUAD xround (double p)
{
if (p < 0)
return (SIGNED_QUAD)ceil(p - .5);
else
return (SIGNED_QUAD)floor(p + .5);
}
#define LINE_LENGTH 79
/* 69. The flush_text procedure will empty the buffer if there is something
* in it. */
static void flush_text (void)
{
if (dvi_buffer_len > 0) {
dvi_buffer[dvi_buffer_len] = 0;
msg_out(M_DEBUG, "[%s]\n", dvi_buffer);
dvi_buffer_len = 0;
}
}
/* 70. And the out_text procedure puts something in it. */
static void out_text (char c)
{
if (dvi_buffer_len == LINE_LENGTH - 2) flush_text();
dvi_buffer[dvi_buffer_len++] = c;
}
#define INFINITY 0x7FFFFFFFL //017777777777
#define MAX_DRIFT 2
#define PIXEL_ROUND(p) xround(conv*(p))
static void move_right (SIGNED_QUAD q)
{
SIGNED_QUAD h, hh, hhh;
h = dvi_state.h; hh = dvi_state.hh;
if (h > 0 && q > 0 && h > INFINITY - q) {
msg_out(M_DEBUG, " arithmetic overflow! parameter changed from '%ld' to '%ld'\n", q, INFINITY - h);
q = INFINITY - h;
}
if (h < 0 && q < 0 && -h > q + INFINITY) {
msg_out(M_DEBUG, " arithmetic overflow! parameter changed from '%ld' to '%ld'\n", q, (-h) - INFINITY);
q = (-h) - INFINITY;
}
hhh = PIXEL_ROUND(h + q);
if (labs(hhh - hh) > MAX_DRIFT) {
if (hhh > hh) hh = hhh - MAX_DRIFT;
else hh = hhh + MAX_DRIFT;
}
msg_out(M_DEBUG, " h:=%ld", h);
if (q >= 0) msg_out(M_DEBUG, "+");
msg_out(M_DEBUG, "%ld=%ld, hh:=%ld", q, h + q, hh);
h = h + q;
if (labs(h) > max_h_so_far) {
if (labs(h) > max_h + 99) {
msg_out(M_DEBUG, " warning: |h|>%ld!", max_h);
max_h = labs(h);
}
max_h_so_far = labs(h);
}
msg_out(M_DEBUG, " \n");
dvi_state.h = h; dvi_state.hh = hh;
}
/* 92. <Finish a command that sets v = v + p, then goto done> */
static void move_down (SIGNED_QUAD p)
{
SIGNED_QUAD v, vv, vvv;
v = dvi_state.v; vv = dvi_state.vv;
if (v > 0 && p > 0 && v > INFINITY - p) {
msg_out(M_DEBUG, " arithmetic overflow! parameter changed from '%ld' to '%ld'\n", p, INFINITY - v);
p = INFINITY - v;
}
if (v < 0 && p < 0 && -v > p + INFINITY) {
msg_out(M_DEBUG, " arithmetic overflow! parameter changed from '%ld' to '%ld'\n", p, (-v) - INFINITY);
p = (-v) - INFINITY;
}
vvv = PIXEL_ROUND(v + p);
if (labs(vvv - vv) > MAX_DRIFT) {
if (vvv > vv) vv = vvv - MAX_DRIFT;
else vv = vvv + MAX_DRIFT;
}
msg_out(M_DEBUG, " v:=%ld", v);
if (p >= 0) msg_out(M_DEBUG, "+");
msg_out(M_DEBUG, "%ld=%ld, vv:=%ld", p, v + p, vv);
v = v + p;
if (labs(v) > max_v_so_far) {
if (labs(v) > max_v + 99) {
msg_out(M_DEBUG, " warning: |v|>%ld!", max_v);
max_v = labs(v);
}
max_v_so_far = labs(v);
}
msg_out(M_DEBUG, " \n");
dvi_state.v = v; dvi_state.vv = vv;
}
/* 84. Rounding to the nearest pixel is best done in the manner shown here,
* so as to be inoffensive to the eye: When the horizontal motion is small,
* like a kern, hh changes by rounding the kern; but when the motion is
* large, hh changes by rounding the true position h so that accumulated
* rounding errors disappear. We allow a larger space in the negative
* direction than in the positive one, because \TeX{} makes comparatively
* large backspaces when it positions accents. */
static void out_space (SIGNED_QUAD p)
{
SIGNED_QUAD font_space;
font_space = (cur_font >= 0 ? dvi_fonts[cur_font].size / 6 : 0);
if (p >= font_space || p <= -4 * font_space) {
out_text(' ');
dvi_state.hh = PIXEL_ROUND(dvi_state.h + p);
} else
dvi_state.hh += PIXEL_ROUND(p);
move_right(p);
}
/* 85. Vertical motion is done similarly, but with the threshold between
* ``small'' and ``large'' increased by a factor of five. The idea is to
* make fractions like ``1\over2'' round consistently, but to absorb
* accumulated rounding errors in the baseline-skip moves. */
static void out_vmove (SIGNED_QUAD p)
{
SIGNED_QUAD font_space;
font_space = (cur_font >= 0 ? dvi_fonts[cur_font].size / 6 : 0);
if (labs(p) >= 5 * font_space)
dvi_state.vv = PIXEL_ROUND(dvi_state.v + p);
else
dvi_state.vv += PIXEL_ROUND(p);
move_down(p);
}
static void do_space (UNSIGNED_BYTE opcode)
{
SIGNED_QUAD x;
msg_out(M_DEBUG, "%ld: ", dvi_location);
switch (opcode) {
case RIGHT1:
x = dvi_signed_byte();
if (frmfp) put_signed_byte(x, frmfp);
msg_out(M_DEBUG, "right1");
break;
case RIGHT2:
x = dvi_signed_pair();
if (frmfp) put_signed_pair(x, frmfp);
msg_out(M_DEBUG, "right2");
break;
case RIGHT3:
x = dvi_signed_triple();
if (frmfp) put_signed_triple(x, frmfp);
msg_out(M_DEBUG, "right3");
break;
case RIGHT4:
x = dvi_signed_quad();
if (frmfp) put_signed_quad(x, frmfp);
msg_out(M_DEBUG, "right4");
break;
case W0:
x = dvi_state.w;
msg_out(M_DEBUG, "w0");
break;
case W1:
x = dvi_state.w = dvi_signed_byte();
if (frmfp) put_signed_byte(x, frmfp);
msg_out(M_DEBUG, "w1");
break;
case W2:
x = dvi_state.w = dvi_signed_pair();
if (frmfp) put_signed_pair(x, frmfp);
msg_out(M_DEBUG, "w2");
break;
case W3:
x = dvi_state.w = dvi_signed_triple();
if (frmfp) put_signed_triple(x, frmfp);
msg_out(M_DEBUG, "w3");
break;
case W4:
x = dvi_state.w = dvi_signed_quad();
if (frmfp) put_signed_quad(x, frmfp);
msg_out(M_DEBUG, "w4");
break;
case X0:
x = dvi_state.x;
msg_out(M_DEBUG, "x0");
break;
case X1:
x = dvi_state.x = dvi_signed_byte();
if (frmfp) put_signed_byte(x, frmfp);
msg_out(M_DEBUG, "x1");
break;
case X2:
x = dvi_state.x = dvi_signed_pair();
if (frmfp) put_signed_pair(x, frmfp);
msg_out(M_DEBUG, "x2");
break;
case X3:
x = dvi_state.x = dvi_signed_triple();
if (frmfp) put_signed_triple(x, frmfp);
msg_out(M_DEBUG, "x3");
break;
case X4:
x = dvi_state.x = dvi_signed_quad();
if (frmfp) put_signed_quad(x, frmfp);
msg_out(M_DEBUG, "x4");
break;
}
msg_out(M_DEBUG, " %ld", x);
if (!dvi_state.d)
out_space(x);
else
out_vmove(x);
}
static void do_vmove (UNSIGNED_BYTE opcode)
{
SIGNED_QUAD y;
flush_text();
msg_out(M_DEBUG, "%ld: ", dvi_location);
switch (opcode) {
case DOWN1:
y = dvi_signed_byte();
if (frmfp) put_signed_byte(y, frmfp);
msg_out(M_DEBUG, "down1");
break;
case DOWN2:
y = dvi_signed_pair();
if (frmfp) put_signed_pair(y, frmfp);
msg_out(M_DEBUG, "down2");
break;
case DOWN3:
y = dvi_signed_triple();
if (frmfp) put_signed_triple(y, frmfp);
msg_out(M_DEBUG, "down3");
break;
case DOWN4:
y = dvi_signed_quad();
if (frmfp) put_signed_quad(y, frmfp);
msg_out(M_DEBUG, "down4");
break;
case Y0:
y = dvi_state.y;
msg_out(M_DEBUG, "y0");
break;
case Y1:
y = dvi_state.y = dvi_signed_byte();
if (frmfp) put_signed_byte(y, frmfp);
msg_out(M_DEBUG, "y1");
break;
case Y2:
y = dvi_state.y = dvi_signed_pair();
if (frmfp) put_signed_pair(y, frmfp);
msg_out(M_DEBUG, "y2");
break;
case Y3:
y = dvi_state.y = dvi_signed_triple();
if (frmfp) put_signed_triple(y, frmfp);
msg_out(M_DEBUG, "y3");
break;
case Y4:
y = dvi_state.y = dvi_signed_quad();
if (frmfp) put_signed_quad(y, frmfp);
msg_out(M_DEBUG, "y4");
break;
case Z0:
y = dvi_state.z;
msg_out(M_DEBUG, "z0");
break;
case Z1:
y = dvi_state.z = dvi_signed_byte();
if (frmfp) put_signed_byte(y, frmfp);
msg_out(M_DEBUG, "z1");
break;
case Z2:
y = dvi_state.z = dvi_signed_pair();
if (frmfp) put_signed_pair(y, frmfp);
msg_out(M_DEBUG, "z2");
break;
case Z3:
y = dvi_state.z = dvi_signed_triple();
if (frmfp) put_signed_triple(y, frmfp);
msg_out(M_DEBUG, "z3");
break;
case Z4:
y = dvi_state.z = dvi_signed_quad();
if (frmfp) put_signed_pair(y, frmfp);
msg_out(M_DEBUG, "z4");
break;
}
msg_out(M_DEBUG, " %ld", y);
if (!dvi_state.d)
out_vmove(y);
else
out_space(-y);
}
#define RULE_PIXELS(p) (SIGNED_QUAD)ceil(conv*(p))
/* 90. <Finish a command that either sets or puts a rule, then goto
* move_right or done> */
static void do_rule (UNSIGNED_BYTE opcode)
{
SIGNED_QUAD width, height;
flush_text();
switch (opcode) {
case SET_RULE:
msg_out(M_DEBUG, "%ld: setrule", dvi_location);
break;
case PUT_RULE:
msg_out(M_DEBUG, "%ld: putrule", dvi_location);
break;
}
height = dvi_signed_quad(); width = dvi_signed_quad();
if (frmfp) {
put_signed_quad(height, frmfp); put_signed_quad(width, frmfp);
}
msg_out(M_DEBUG, " height %ld width %ld", height, width);
if (height <= 0 || width <= 0)
msg_out(M_DEBUG, " (invisible) \n");
else {
msg_out(M_DEBUG, " %ldx%ld pixels \n", RULE_PIXELS(height), RULE_PIXELS(width));
calc_bbox(width, height, 0);
}
/*
* SET_RULE: Typeset a solid black rectangle of height |a| and width |b|,
* with its bottom left corner at |(h,v)|. Then set |h:=h+b|. If either
* |a<=0| or |b<=0|, nothing should be typeset. Note that if |b<0|, the
* value of |h| will decrease even though nothing else happens.
*/
if (opcode == SET_RULE) {
dvi_state.hh += RULE_PIXELS(width);
move_right(width);
}
}
/* 89. <Finish a command that either sets or puts a character, then
* goto move_right or done> */
static void fin_set (UNSIGNED_BYTE p, int move)
{
SIGNED_QUAD width, height, depth;
if (cur_font < 0)
msg_out(M_FAIL, "[fatal] fin_set(): No font selected.\n");
width = sqxfw(dvi_fonts[cur_font].size, tfm_get_fw_width(dvi_fonts[cur_font].tfm_id, p));
height = sqxfw(dvi_fonts[cur_font].size, tfm_get_fw_height(dvi_fonts[cur_font].tfm_id, p));
depth = sqxfw(dvi_fonts[cur_font].size, tfm_get_fw_depth(dvi_fonts[cur_font].tfm_id, p));
calc_bbox(width, height, depth);
if (!move) return;
if (!dvi_state.d) {
dvi_state.hh += PIXEL_ROUND(width);
move_right(width);
} else {
dvi_state.vv += PIXEL_ROUND(width);
move_down(width);
}
}
/* 88. Translate a set_char command. */
static void do_setchar (UNSIGNED_BYTE opcode)
{
if (opcode > 32 && opcode < 127) /* from '!' to '~' */
out_text(opcode - SET_CHAR_0);
else
flush_text();
msg_out(M_DEBUG, "%ld: setchar%d", dvi_location, opcode - SET_CHAR_0);
fin_set(opcode - SET_CHAR_0, 1);
}
/* 89. <Finish a command that either sets or puts a character, then
* goto move_right or done> */
static void do_set (UNSIGNED_BYTE opcode)
{
SIGNED_QUAD ch;
flush_text();
msg_out(M_DEBUG, "%ld: ", dvi_location);
switch (opcode) {
case SET1:
ch = dvi_unsigned_byte();
if (frmfp) put_unsigned_byte(ch, frmfp);
break;
case SET2:
ch = dvi_unsigned_pair();
if (frmfp) put_unsigned_pair(ch, frmfp);
break;
case SET3:
ch = dvi_unsigned_triple();
if (frmfp) put_unsigned_triple(ch, frmfp);
break;
case SET4:
ch = dvi_signed_quad();
if (frmfp) put_signed_quad(ch, frmfp);
break;
}
msg_out(M_DEBUG, " set%c %ld ", '1' + (opcode - SET1), ch);
fin_set(ch, 1);
}
/* 89. <Finish a command that either sets or puts a character, then
* goto move_right or done> */
static void do_put (UNSIGNED_BYTE opcode)
{
SIGNED_QUAD ch;
flush_text();
msg_out(M_DEBUG, "%ld: ", dvi_location);
switch (opcode) {
case PUT1:
ch = dvi_unsigned_byte();
if (frmfp) put_unsigned_byte(ch, frmfp);
break;
case PUT2:
ch = dvi_unsigned_pair();
if (frmfp) put_unsigned_pair(ch, frmfp);
break;
case PUT3:
ch = dvi_unsigned_triple();
if (frmfp) put_unsigned_triple(ch, frmfp);
break;
case PUT4:
ch = dvi_signed_quad();
if (frmfp) put_signed_quad(ch, frmfp);
break;
}
msg_out(M_DEBUG, " put%c %ld ", '1' + (opcode - PUT1), ch);
fin_set(ch, 0);
}
static void show_state (void)
{
msg_out(M_DEBUG, "level %d:(h=%ld,v=%ld,w=%ld,x=%ld,y=%ld,z=%ld,hh=%ld,vv=%ld) \n", dvi_stack_depth, dvi_state.h, dvi_state.v, dvi_state.w, dvi_state.x, dvi_state.y, dvi_state.z, dvi_state.hh, dvi_state.vv);
}
static void do_push (void)
{
flush_text();
msg_out(M_DEBUG, "%ld: push \n", dvi_location);
show_state();
if (dvi_stack_depth < DVI_MAX_STACK_DEPTH)
dvi_stack[dvi_stack_depth++] = dvi_state;
else
msg_out(M_FAIL, "[fatal] do_push(): DVI stack exceeded.\n");
}
static void do_pop (void)
{
BBOX *bb;
if (dvi_stack_depth > 0)
dvi_state = dvi_stack[--dvi_stack_depth];
else
msg_out(M_FAIL, "[fatal] do_pop(): Tried to pop an empty stack.\n");
flush_text();
msg_out(M_DEBUG, "%ld: pop \n", dvi_location);
show_state();
/* reset bounding boxes */
bb = page_bbox.next;
while (bb) {
if (bb->lev_s == dvi_stack_depth + 1 && bb->type == LINES_TYPE) {
flush_bbox(bb);
reset_bbox(bb);
}
bb = bb->next;
}
}
static void do_fnt_num (UNSIGNED_BYTE opcode)
{
register int i;
SIGNED_QUAD id;
flush_text();
msg_out(M_DEBUG, "%ld: ", dvi_location);
if (opcode >= FNT_NUM_0 && opcode <= FNT_NUM_63) {
id = opcode - FNT_NUM_0;
msg_out(M_DEBUG, "fntnum%ld ", id);
} else {
switch (opcode) {
case FNT1:
id = dvi_unsigned_byte();
if (frmfp) put_unsigned_byte(id, frmfp);
break;
case FNT2:
id = dvi_unsigned_pair();
if (frmfp) put_unsigned_pair(id, frmfp);
break;
case FNT3:
id = dvi_unsigned_triple();
if (frmfp) put_unsigned_triple(id, frmfp);
break;
case FNT4:
id = dvi_signed_quad();
if (frmfp) put_signed_quad(id, frmfp);
break;
}
msg_out(M_DEBUG, "fnt%c %ld ", '1' + (opcode - FNT1), id);
}
for (i = 0; i < num_dvi_fonts; i++)
if (dvi_fonts[i].id == id) break;
if (i == num_dvi_fonts)
msg_out(M_FAIL, "[fatal] do_fnt_num(): Tried to select a font (ID %ld) that hasn't been defined.\n", id);
msg_out(M_DEBUG, "current font is %s \n", dvi_fonts[i].name);
if (!dvi_fonts[i].used) {
dvi_fonts[i].tfm_id = tfm_open(dvi_fonts[i].name, 1);
dvi_fonts[i].used = 1;
}
cur_font = i;
}
static void do_pos_special (unsigned char *buffer, SIGNED_QUAD buffer_len)
{
unsigned char *cmd, *tag, *p;
SIGNED_QUAD x, y, w, h, d;
double w_pt, h_pt, d_pt; /* in pt */
int parsed = 0; /* how many conversions the sscanf managed */
struct /* see \doregisterparoptions in ConTeXt's core-pos.tex */
{
double hsize, leftskip, rightskip, hangindent, parindent;
SIGNED_QUAD hangafter;
} list;
for (p = buffer; p - buffer < buffer_len && isspace(*p); p++)
; /* skip white chars */
if (strncmp(p, "pos:", 4)) return;
for (cmd = p; p - buffer < buffer_len && !isspace(*p); p++)
; /* retrieve POS command */
for (*p++ = 0; p - buffer < buffer_len && isspace(*p); p++)
; /* skip white chars */
/* retrieve POS identification */
if (*p == '"')
for (tag = ++p; p - buffer < buffer_len && *p != '"'; p++);
else
for (tag = p; p - buffer < buffer_len && !isspace(*p); p++);
*p = 0;
for (p++; p - buffer < buffer_len && isspace(*p); p++)
; /* skip white chars */
if (p - buffer < buffer_len)
{
/* hangafter is a number, not a dimension, hence its %ld */
parsed = sscanf(p, "%lfpt %lfpt %lfpt %lfpt,%lfpt,%lfpt,%lfpt,%ld,%lfpt",
&w_pt, &h_pt, &d_pt,
&list.hsize, &list.leftskip, &list.rightskip,
&list.hangindent, &list.hangafter, &list.parindent);
/* convert pt to sp. Forget about rounding (add 0.5 if you want it). */
w = w_pt * 65536;
h = h_pt * 65536;
d = d_pt * 65536;
}
x = dvi_state.h + denominator / 100;
y = max_v - dvi_state.v;
if (strcmp(cmd, "pos:pxy") == 0)
fprintf(outfp, "\\pospxy{%s}{%d}{%ldsp}{%ldsp}\n", tag, current_page, x, y);
else if (strcmp(cmd, "pos:pxywhd") == 0)
fprintf(outfp, "\\pospxywhd{%s}{%d}{%ldsp}{%ldsp}{%ldsp}{%ldsp}{%ldsp}\n", tag, current_page, x, y, w, h, d);
else if (strcmp(cmd, "pos:pxyplus") == 0) {
if (parsed < 9)
fprintf(stderr, "dvipos: only %d conversions for \\pospxyplus but 9 are needed\nBeward: Coordinates in the output may therefore be junk. Continuing anyway...", parsed);
fprintf(outfp, "\\pospxyplus{%s}{%d}{%ldsp}{%ldsp}{%ldsp}{%ldsp}{%ldsp}", tag, current_page, x, y, w, h, d);
fprintf(outfp, "{%lfpt,%lfpt,%lfpt,%lfpt,%ld,%lfpt}\n",
list.hsize, list.leftskip, list.rightskip,
list.hangindent, list.hangafter, list.parindent);
}
else if (strcmp(cmd, "pos:begbox") == 0)
new_bbox(tag, BOX_TYPE);
else if (strcmp(cmd, "pos:endbox") == 0)
close_bbox(tag);
else if (strcmp(cmd, "pos:beglines") == 0)
new_bbox(tag, LINES_TYPE);
else if (strcmp(cmd, "pos:endlines") == 0)
close_bbox(tag);
}
static void do_xxx (UNSIGNED_BYTE opcode)
{
SIGNED_QUAD size;
unsigned char *sp_buf;
flush_text();
msg_out(M_DEBUG, "%ld: xxx ", dvi_location);
switch (opcode) {
case XXX1:
size = dvi_unsigned_byte();
if (frmfp) put_unsigned_byte(size, frmfp);
break;
case XXX2:
size = dvi_unsigned_pair();
if (frmfp) put_unsigned_pair(size, frmfp);
break;
case XXX3:
size = dvi_unsigned_triple();
if (frmfp) put_unsigned_triple(size, frmfp);
break;
case XXX4:
size = dvi_signed_quad();
if (frmfp) put_signed_quad(size, frmfp);
break;
}
sp_buf = (unsigned char *)calloc(size+1, sizeof(unsigned char));
if (fread(sp_buf, sizeof(unsigned char), size, dvi_file) != size)
msg_out(M_FAIL, "[fatal] do_xxx(): Failed to read the special commands with size %d.\n", size);
if (frmfp) {
fwrite(sp_buf, sizeof(unsigned char), size, frmfp);
dbg_location += size;
}
msg_out(M_DEBUG, "'%s' \n", sp_buf);
dvi_location += size;
do_pos_special(sp_buf, size); /* defined in dvispec.c */
free(sp_buf);
}
static void dvi_clear_state (void)
{
cur_font = -1; /* set current font undefined */
dvi_stack_depth = 0;
dvi_state.h = 0; dvi_state.v = 0; dvi_state.w = 0;
dvi_state.x = 0; dvi_state.y = 0; dvi_state.z = 0;
dvi_state.hh = 0; dvi_state.vv = 0;
dvi_state.d = 0; /* direction for ASCII pTeX */
}
static void do_bop (void)
{
int i;
msg_out(M_DEBUG, " \n%ld: beginning of page %d \n", dvi_location, current_page);
if (frmfp) {
for (i = 0; i < 10; i++) put_signed_quad(dvi_signed_quad(), frmfp);
/* the previous page location */
dvi_signed_quad();
put_signed_quad(prev_page_location, frmfp);
prev_page_location = dbg_location - 45;
} else
for (i = 0; i < 11; i++) dvi_signed_quad();
dvi_clear_state();
clear_bbox(0);
}
static void do_eop (void)
{
BBOX *bb;
flush_text();
msg_out(M_DEBUG, "%ld: eop ", dvi_location);
msg_out(M_DEBUG, "[%ld %ld %ld %ld]", page_bbox.h1, page_bbox.v1, page_bbox.h2, page_bbox.v2);
/* reset bounding boxes */
bb = page_bbox.next;
while (bb) {
reset_bbox(bb);
bb = bb->next;
}
flush_bbox(&page_bbox);
if (frmfp) put_unsigned_byte(EOP, frmfp);
}
static void do_dir (void)
{
dvi_state.d = dvi_unsigned_byte();
if (frmfp) put_unsigned_byte(dvi_state.d, frmfp);
msg_out(M_DEBUG, "%ld: dir %d \n", dvi_location-1, dvi_state.d);
}
static void do_fnt_def (UNSIGNED_BYTE opcode)
{
register int dlen, flen;
SIGNED_QUAD id;
char *fnt_buf;
flush_text();
switch (opcode) {
case FNT_DEF1:
id = dvi_unsigned_byte();
if (frmfp) put_unsigned_byte(id, frmfp);
msg_out(M_DEBUG, "%ld: fntdef1 %ld: ", dvi_location-1, id);
break;
case FNT_DEF2:
id = dvi_unsigned_pair();
if (frmfp) put_unsigned_pair(id, frmfp);
msg_out(M_DEBUG, "%ld: fntdef2 %ld: ", dvi_location-2, id);
break;
case FNT_DEF3:
id = dvi_unsigned_triple();
if (frmfp) put_unsigned_triple(id, frmfp);
msg_out(M_DEBUG, "%ld: fntdef3 %ld: ", dvi_location-3, id);
break;
case FNT_DEF4:
id = dvi_signed_quad();
if (frmfp) put_signed_quad(id, frmfp);
msg_out(M_DEBUG, "%ld: fntdef4 %ld: ", dvi_location-4, id);
break;
}
/* the checksum that TeX found in the TFM file for this font */
if (frmfp) put_signed_quad(dvi_signed_quad(), frmfp);
else dvi_signed_quad();
/* a fixed-point scale factor */
if (frmfp) put_signed_quad(dvi_signed_quad(), frmfp);
else dvi_signed_quad();
/* the "design size" */
if (frmfp) put_signed_quad(dvi_signed_quad(), frmfp);
else dvi_signed_quad();
/* the length of the "area" or directory */
dlen = dvi_unsigned_byte();
if (frmfp) put_unsigned_byte(dlen, frmfp);
/* the length of the font name itself */
flen = dvi_unsigned_byte();
if (frmfp) put_unsigned_byte(flen, frmfp);
/* the external name of the font */
fnt_buf = (char *)calloc(dlen+flen+1, sizeof(char));
flen = fread(fnt_buf, sizeof(char), dlen+flen, dvi_file);
if (frmfp) {
fwrite(fnt_buf, sizeof(char), flen, frmfp);
dbg_location += flen;
}
fnt_buf[flen] = 0;
msg_out(M_DEBUG, "%s \n", fnt_buf);
dvi_location += flen;
free(fnt_buf);
}
/* 110. The conversion factor \emph{conv} is figured as follows: There are
* exactly $n/d$ decimicrons per DVI unit, and 254000 decimicrons per inch,
* and \emph{resolution} pixels per inch. Then we have to adjust this by
* the stated amount of magnification. */
static void compute_conversion_factors (void)
{
if ((numerator = dvi_signed_quad()) <= 0)
msg_out(M_FAIL, "Bad DVI file: numerator is %d!\n", numerator);
if ((denominator = dvi_signed_quad()) <= 0)
msg_out(M_FAIL, "Bad DVI file: denominator is %d!\n", denominator);
msg_out(M_DEBUG, "numerator/denominator=%ld/%ld\n", numerator, denominator);
tfm_conv = ((double)25400000.0/numerator) * (denominator/(double)473628672)/16.0;
conv = (numerator/(double)254000.0) * (resolution/denominator);
dvi_mag = mag = dvi_signed_quad();
if (new_mag > 0)
mag = new_mag; /* override the existing maginification */
else if (mag <= 0)
msg_out(M_FAIL, "Bad DVI file: magnification is %d!\n", mag);
true_conv = conv;
conv = true_conv * (mag/(double)1000.0);
msg_out(M_DEBUG, "magnification=%ld; %16.8f pixels per DVI unit\n", mag, conv);
}
/* 109. A DVI-reading program that reads the postamble first need not look
* at the preamble; but DVItype looks at the preamble in order to do error
* checking, and to display the introductory comment. */
static void process_preamble (void)
{
fseek(dvi_file, 0L, SEEK_SET);
/* fetch the first byte */
if (dvi_unsigned_byte() != PRE)
msg_out(M_FAIL, "First byte isn't start of preamble!\n");
/* fetch the identification byte */
if ((id = dvi_unsigned_byte()) != DVI_ID && id != DVIV_ID)
msg_out(M_FAIL, "identification in byte 1 should be %d or %d.\n", DVI_ID, DVIV_ID);
compute_conversion_factors();
/* fetch the introductory comment */
comment[fread(comment, sizeof(char), dvi_unsigned_byte(), dvi_file)] = 0;
msg_out(M_DEBUG, "'%s'\n", comment);
}
/* 19. The last page in a DVI file is followed by `\emph{post}'; this command
* introduces the postamble, which summarizes important facts that \TeX{} has
* accumulated about the file, making it possible to print subsets of the data
* with reasonable efficiency. The postamble has the form
*
* post p[4] num[4] den[4] mag[4] l[4] u[4] s[2] t[2]
* <font definitions>
* post_post q[4] i[1] 223's[>=4]
*
* Here $p$ is a pointer to the final bop in the file. The next three
* parameters, $num$, $den$, and $mag$, are duplicates of the quantities that
* appeared in the preamble.
*/
/* 103. Reading the postamble. Now imagine that we are reading the DVI file
* and positioned just four bytes after the \emph{post} command. That,
* in fact, is the situation, when the following part of DVItype is called
* upon to read, translate, and check the rest of the postamble. */
/* 20. The curious way to finish off a DVI file makes it feasible for
* DVI-reading programs to find the postamble first, on most computers,
* even though \TeX{} wants to write the postamble last. Most operating
* systems permit random access to individual words or bytes of a file,
* so the DVI reader can start at the end and skip backwards over the
* 223's until finding the identification byte. Then it can back up four
* bytes, read $q$, and move to byte $q$ of the file. This byte should,
* of course, contain the value 248 (\emph{post}); now the postamble can
* be read, so the DVI reader discovers all the information needed for
* typesetting the pages. Note that it is also possible to skip through
* the DVI file at reasonably high speed to locate a particular page,
* if that proves desirable. This saves a lot of time, since DVI files
* used in production jobs tend to be large. */
static void read_postamble (void)
{
UNSIGNED_BYTE opcode;
SIGNED_QUAD current_location = dvi_fsize;
/* scan backwards through PADDING */
do {
current_location--;
fseek(dvi_file, current_location, SEEK_SET);
} while((opcode = dvi_unsigned_byte()) == PADDING && current_location > 0);
/* current_location now points to the identification byte */
if (dvi_fsize <= current_location + 4)
msg_out(M_FAIL, "Bad DVI file: not enough signature bytes at end of file (%ld)\n", dvi_fsize - current_location - 1);
post_post_location = current_location - 5;
fseek(dvi_file, post_post_location, SEEK_SET);
if ((opcode = dvi_unsigned_byte()) != POST_POST)
msg_out(M_FAIL, "[fatal] Found (%d) where POST_POST should be.\n", opcode);
/* now points to the pointer $q$ to the \emph{post} command */
post_location = dvi_signed_quad();
fseek(dvi_file, post_location, SEEK_SET);
if ((opcode = dvi_unsigned_byte()) != POST)
msg_out(M_FAIL, "[fatal] Found (%d) where POST should be\n", opcode);
msg_out(M_DEBUG, "Postamble starts at byte %ld.\n", post_location);
dvi_signed_quad(); /* skip the first four bytes; p[4] */
if (dvi_signed_quad() != numerator)
msg_out(M_FAIL, "Bad DVI file: numerator doesn't match the preamble!\n");
if (dvi_signed_quad() != denominator)
msg_out(M_FAIL, "Bad DVI file: denominator doesn't match the preamble!\n");
if (dvi_signed_quad() != mag && new_mag == 0)
msg_out(M_FAIL, "Bad DVI file: magnification doesn't match the preamble!\n");
max_v = dvi_signed_quad();
max_h = dvi_signed_quad();
msg_out(M_DEBUG, "maxv=%ld, maxh=%ld, ", max_v, max_h);
if ((max_s = dvi_signed_pair()) > DVI_MAX_STACK_DEPTH)
msg_out(M_FAIL, "[fatal] maxstackdepth %d exceeds DVI_MAX_STACK_DEPTH %d\n", max_s, DVI_MAX_STACK_DEPTH);
total_pages = dvi_signed_pair();
msg_out(M_DEBUG, "maxstackdepth=%d, totalpages=%d\n", max_s, total_pages);
}
static void find_page_location (void)
{
int i;
/* Read the total page number */
fseek(dvi_file, post_location+27, SEEK_SET);
if ((dvi_pages = dvi_unsigned_pair()) == 0)
msg_out(M_FAIL, "[fatal] Total page number is zero.\n");
/* Read the location of each page */
page_location = (SIGNED_QUAD *)calloc(dvi_pages, sizeof(SIGNED_QUAD));
fseek(dvi_file, post_location+1, SEEK_SET);
page_location[dvi_pages-1] = dvi_signed_quad();
if (page_location[dvi_pages-1] + 41 > dvi_fsize)
msg_out(M_FAIL, "[fatal] The location of the page %d was broken.\n", dvi_pages);
for (i = dvi_pages-2; i >= 0; i--) {
fseek(dvi_file, page_location[i+1] + 41, SEEK_SET);
page_location[i] = dvi_signed_quad();
if (page_location[i] + 41 > dvi_fsize)
msg_out(M_FAIL, "[fatal] The location of the page %d was broken.\n", i+1);
}
}
/* 59. The following subroutine does the necessary things when a fnt_def
* command is being processed. */
static void define_font (SIGNED_QUAD e)
{
SIGNED_QUAD c, q, d, m;
int p, n;
char *name;
if (num_dvi_fonts >= max_dvi_fonts) {
max_dvi_fonts += MAX_FONTS_STEP;
dvi_fonts = (struct dvi_font *)realloc(dvi_fonts, max_dvi_fonts * sizeof(struct dvi_font));
}
c = dvi_signed_quad(); /* font_check_sum */
q = dvi_signed_quad(); /* font_scaled_size */
d = dvi_signed_quad(); /* font_design_size */
if (q <= 0 || d <= 0) m = 1000;
else m = xround((1000.0*conv*q)/(true_conv*d));
p = dvi_unsigned_byte();
n = dvi_unsigned_byte();
msg_out(M_DEBUG, "Font %ld: ", e);
/* Retrieve the directory name and the font name */
if (p + n > 0) {
name = (char *)calloc(p+n+1, sizeof(char));
if (fread(name, sizeof(char), p+n, dvi_file) != p+n)
msg_out(M_FAIL, "[fatal] Failed to retrieve a font name.\n");
name[p+n] = 0;
}
msg_out(M_DEBUG, "%s", (p + n > 0 ? name : "null font name!"));
if (m != 1000)
msg_out(M_DEBUG, " scaled %ld", m);
dvi_fonts[num_dvi_fonts].name = name;
dvi_fonts[num_dvi_fonts].size = q; /* scaled_size */
dvi_fonts[num_dvi_fonts].id = e;
dvi_fonts[num_dvi_fonts].used = 0;
msg_out(M_DEBUG, "---loaded at size %ld DVI units \n", q);
d = xround((100.0*conv*q)/(true_conv*d));
if (d != 100)
msg_out(M_DEBUG, " (this font is magnified %ld%c) \n", d, '%');
num_dvi_fonts++;
}
static void process_fonts (void)
{
UNSIGNED_BYTE opcode;
// fseek(dvi_file, post_location+29, SEEK_SET);
while ((opcode = dvi_unsigned_byte()) != POST_POST)
switch (opcode) {
case FNT_DEF1: define_font(dvi_unsigned_byte()); break;
case FNT_DEF2: define_font(dvi_unsigned_pair()); break;
case FNT_DEF3: define_font(dvi_unsigned_triple()); break;
case FNT_DEF4: define_font(dvi_signed_quad()); break;
default: msg_out(M_FAIL, "Bad DVI file: byte %ld is not postpost!\n", dvi_location);
}
}
void dvi_init (int m, int r)
{
time_t tm = time(NULL);
/* get all variables initialized */
dvi_file = infp;
new_mag = (SIGNED_QUAD)m;
resolution = (double)r;
/* 73. Three characteristics of the pages (their max_v, max_h, and max_s)
* are specified in the postamble, and a warning message is printed if
* their limits are exceeded. Actually max_v is set to the maximum height
* plus depth of a page, and max_h to the maximum width, for purposes of
* page layout. Since characters can legally be set outside of the page
* boundaries, it is not an error when max_v or max_h is exceeded. But
* max_s should not be exceeded.
* The postamble also specifies the total number of pages; DVItype
* checks to see if this total is accurate. */
// max_v = max_h = 017777777777 - 99;
// max_s = stack_size + 1;
max_v_so_far = max_h_so_far = max_s_so_far = page_count = 0;
/* Calculate the file size of the DVI file */
fseek(dvi_file, 0L, SEEK_END);
dvi_fsize = ftell(dvi_file);
rewind(dvi_file);
/* process the preamble */
process_preamble();
/* reading the postamble */
read_postamble();
/* process the font definitions of the postamble */
process_fonts();
/* Find the post opcode */
find_page_location();
dvi_clear_state(); clear_bbox(1);
if (bbxfp) {
fprintf(bbxfp, "%%!! DVIpos, version (%s), output file\n", VERSION);
fprintf(bbxfp, "%% This_position_filename: \"%s\"\n", bbxfname);
fprintf(bbxfp, "%% Command_line_to_dvipos:\n");
fprintf(bbxfp, "%%+ <THE_COMMAND_LINE>\n");
fprintf(bbxfp, "%%+ <THE_COMMAND_LINE CONTINUED>\n");
fprintf(bbxfp, "%% Processing_data_and_time: %s", ctime(&tm));
fprintf(bbxfp, "%% Input_filename: \"%s\"\n", infname);
if (frmfp)
fprintf(bbxfp, "%% DVI_debug_output_filename: \"%s\"\n", frmfname);
fprintf(bbxfp, "%% DVI_standard: %d\n", id);
fprintf(bbxfp, "%% DVI_mag: %ld\n", dvi_mag);
fprintf(bbxfp, "%% DVI_mag_requested: %ld\n", mag);
}
if (frmfp) {
int count = 15 + strlen(comment);
char *buf = (char *)xmalloc(count);
fseek(dvi_file, 0L, SEEK_SET);
fread(buf, 1, count, dvi_file);
sput_signed_quad(buf+10, mag);
fwrite(buf, 1, count, frmfp);
dbg_location += count;
free(buf);
}
}
void dvi_close (void)
{
int i;
if (frmfp) {
char *buf;
int count = post_post_location - post_location - 29;
SIGNED_QUAD new_post_location = dbg_location; /* new post_location */
put_unsigned_byte(POST, frmfp);
put_signed_quad(prev_page_location, frmfp);
put_signed_quad(numerator, frmfp);
put_signed_quad(denominator, frmfp);
put_signed_quad(mag, frmfp);
put_signed_quad(max_v_so_far, frmfp);
put_signed_quad(max_h_so_far, frmfp);
put_unsigned_pair(max_s, frmfp);
put_unsigned_pair(new_dvi_pages, frmfp);
buf = (char *)xmalloc(count);
fseek(dvi_file, post_location + 29, SEEK_SET);
fread(buf, 1, count, dvi_file);
fwrite(buf, 1, count, frmfp);
free(buf);
dbg_location += count;
put_unsigned_byte(POST_POST, frmfp);
put_signed_quad(new_post_location, frmfp);
put_unsigned_byte(id, frmfp);
for (i = 0; i < 3; i++)
put_unsigned_byte(223, frmfp);
while (dbg_location % 4 != 3)
put_unsigned_byte(223, frmfp);
}
tfm_close_all();
fclose(dvi_file);
free(page_location);
for (i = 0; i < num_dvi_fonts; i++) free(dvi_fonts[i].name);
if (dvi_fonts) free(dvi_fonts);
}
/* 79. Here is the overall setup. */
void dvi_do_page (int n)
{
dvi_location = page_location[n-1] - 1;
current_page = n;
new_dvi_pages++;
/* Position to beginning of page */
fseek(dvi_file, page_location[n-1], SEEK_SET);
/* set current font undefined; initialize the state variables */
dvi_clear_state();
/* 80. Translate the next command in the DVI file until finding EOP. */
for (;;) {
UNSIGNED_BYTE opcode = dvi_unsigned_byte();
if (frmfp && opcode != EOP) put_unsigned_byte(opcode, frmfp);
/* SET_CHAR_0 - SET_CHAR_127 */
if (opcode >= SET_CHAR_0 && opcode <= SET_CHAR_127) {
do_setchar(opcode);
continue;
}
/* FNT_NUM_0 - FNT_NUM_63 */
if (opcode >= FNT_NUM_0 && opcode <= FNT_NUM_63) {
do_fnt_num(opcode);
continue;
}
switch (opcode) {
case SET1:
case SET2:
case SET3:
case SET4: do_set(opcode); break;
case PUT1:
case PUT2:
case PUT3:
case PUT4: do_put(opcode); break;
case SET_RULE:
case PUT_RULE: do_rule(opcode); break;
case NOP: msg_out(M_DEBUG, "%ld: nop \n", dvi_location); break;
case BOP: do_bop(); break;
case EOP: do_eop(); return;
case PUSH: do_push(); break;
case POP: do_pop(); break;
case RIGHT1:
case RIGHT2:
case RIGHT3:
case RIGHT4:
case W0:
case W1:
case W2:
case W3:
case W4:
case X0:
case X1:
case X2:
case X3:
case X4: do_space(opcode); break;
case DOWN1:
case DOWN2:
case DOWN3:
case DOWN4:
case Y0:
case Y1:
case Y2:
case Y3:
case Y4:
case Z0:
case Z1:
case Z2:
case Z3:
case Z4: do_vmove(opcode); break;
case FNT1:
case FNT2:
case FNT3:
case FNT4: do_fnt_num(opcode); break;
case XXX1:
case XXX2: /* Not used in general */
case XXX3: /* Not used in general */
case XXX4: do_xxx(opcode); break;
case FNT_DEF1:
case FNT_DEF2:
case FNT_DEF3:
case FNT_DEF4: do_fnt_def(opcode); break;
case DIR: do_dir(); break;
case PRE:
case POST:
case POST_POST:
default:
msg_out(M_FAIL, "[fatal] Unexpected opcode (%d).", opcode);
}
}
}
_______________________________________________
dev-context mailing list
[email protected]
http://www.ntg.nl/mailman/listinfo/dev-context
