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prt_ps: Rewrite non-printable character processing

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Should fix hangs and slowdowns during printing.
This commit is contained in:
David Hrdlička
2020-04-15 23:42:20 +02:00
parent d9bc075658
commit cf581db7ab
1 changed files with 27 additions and 33 deletions
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60
src/printer/prt_ps.c
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@@ -246,45 +246,39 @@ ps_write_data(uint8_t val, void *p)
dev->data = (char) val;
}
static bool
process_nonprintable(ps_t *dev)
{
switch (dev->data) {
case '\b':
dev->buffer_pos--;
break;
case '\r':
dev->buffer_pos = 0;
if (dev->autofeed)
write_buffer(dev, true);
break;
case '\v':
case '\f':
case '\n':
write_buffer(dev, true);
break;
case 0x04: // Ctrl+D
write_buffer(dev, false);
finish_document(dev);
break;
/* Characters that should be written to the buffer as-is */
case '\t':
return false;
}
return true;
}
static void
process_data(ps_t *dev)
{
/* Check for non-printable characters */
if (dev->data < 0x20 || dev->data == 0x7F) {
if (process_nonprintable(dev))
return;
switch (dev->data) {
/* The following characters are considered white-space
by the PostScript specification */
case '\t':
case '\n':
case '\f':
case '\r':
break;
/* Same with NUL, except we better change it to a space first */
case '\0':
dev->data = ' ';
break;
/* Ctrl+D (0x04) marks the end of the document */
case '\4':
write_buffer(dev, false);
finish_document(dev);
return;
/* Don't bother with the others */
default:
return;
}
}
if (dev->buffer_pos == POSTSCRIPT_BUFFER_LENGTH) {
/* Flush the buffer if we have run to its end */
if (dev->buffer_pos == POSTSCRIPT_BUFFER_LENGTH - 1) {
write_buffer(dev, false);
dev->buffer_pos = 0;
}