/* Copyright (C) 2000 Aladdin Enterprises.  All rights reserved.
  
  This file is part of AFPL Ghostscript.
  
  AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author or
  distributor accepts any responsibility for the consequences of using it, or
  for whether it serves any particular purpose or works at all, unless he or
  she says so in writing.  Refer to the Aladdin Free Public License (the
  "License") for full details.
  
  Every copy of AFPL Ghostscript must include a copy of the License, normally
  in a plain ASCII text file named PUBLIC.  The License grants you the right
  to copy, modify and redistribute AFPL Ghostscript, but only under certain
  conditions described in the License.  Among other things, the License
  requires that the copyright notice and this notice be preserved on all
  copies.
*/

/*$Id$ */
/* SFF format writer for CAPI fax devices */
#include "gdevprn.h"
#include "strimpl.h"
#include "scfx.h"
#include "gdevfax.h"
 
/* The device descriptor */
private dev_proc_print_page(cfax_print_page);
private dev_proc_close_device(cfax_prn_close);

/* Define procedures for cfax. For sff multipage documents  */
/* a special close procedure is required because sff needs  */
/* an additional "end of document" signature after the last */ 
/* "end page" signature */
private const gx_device_procs gdev_cfax_std_procs =
    prn_params_procs(gdev_prn_open, gdev_prn_output_page, cfax_prn_close,
		     gdev_fax_get_params, gdev_fax_put_params);

const gx_device_fax gs_cfax_device = {
    FAX_DEVICE_BODY(gx_device_fax, gdev_cfax_std_procs, "cfax", cfax_print_page)
};

/* ---------------- SFF output ----------------- */

private void
cfax_byte(uint c, FILE * file)
{
    fputc(c & 0xff, file);
}

private void
cfax_word(ushort c, FILE * file)
{
    cfax_byte(c & 0xff, file);
    cfax_byte(c >> 8, file);
}

private void
cfax_dword(ulong c, FILE * file)
{
    cfax_byte(c & 0xff, file);
    cfax_byte(c >> 8, file);
    cfax_byte(c >> 16, file);
    cfax_byte(c >> 24, file);
}

private void
cfax_doc_hdr(FILE * file)
{
    cfax_byte('S', file);
    cfax_byte('f', file);
    cfax_byte('f', file);
    cfax_byte('f', file);
    cfax_byte(1, file);
    cfax_byte(0, file);
    cfax_word(0, file);
    cfax_word(0, file);
    cfax_word(20, file);
    cfax_dword(0, file);
    cfax_dword(0, file);
}

private void
cfax_page_hdr(gx_device_printer * pdev, FILE * file)
{
    cfax_byte(254, file);
    cfax_byte(16, file);
    cfax_byte((pdev->y_pixels_per_inch < 100 ? 0 : 1), file);
    cfax_byte(0, file);
    cfax_byte(0, file);
    cfax_byte(0, file);
    cfax_word(pdev->width, file);
    cfax_word(pdev->height, file);
    cfax_dword(0, file);
    cfax_dword(0, file);
}

private void
cfax_doc_end(FILE * file)
{
    cfax_byte(254, file);
    cfax_byte(0, file);
}

/* Send the page to the printer. */
private int
cfax_stream_print_page_width(gx_device_printer * pdev, FILE * prn_stream,
			     const stream_template * temp, stream_state * ss, 
               		     int width)
{
    gs_memory_t *mem = pdev->memory;
    int code = 0;
    stream_cursor_read r;
    stream_cursor_write w;
    int in_size = gdev_prn_raster((gx_device *) pdev);
    /*
     * Because of the width adjustment for fax systems, width may
     * be different from (either greater than or less than) pdev->width.
     * Allocate a large enough buffer to account for this.
     */
    int col_size = (width * pdev->color_info.depth + 7) >> 3;
    int max_size = max(in_size, col_size);
    int lnum, nbytes, i;
    byte *in;
    byte *out;
    /* If the file is 'nul', don't even do the writes. */
    bool nul = !strcmp(pdev->fname, "nul");

    /* Initialize the common part of the encoder state. */
    ss->template = temp;
    ss->memory = mem;

    /* Allocate the buffers. */
    in = gs_alloc_bytes(mem, temp->min_in_size + max_size + 1, 
    	"cfax_stream_print_page(in)");

#define OUT_SIZE 1000
    out = gs_alloc_bytes(mem, OUT_SIZE, "cfax_stream_print_page(out)");
    if (in == 0 || out == 0) {
	code = gs_note_error(gs_error_VMerror);
	goto done;
    }

    /* Process the image */ 
    for (lnum = 0; lnum < pdev->height; lnum++) {
	/* Initialize read and write pointer each time, because they're getting modified */
	r.ptr = in - 1;
    	r.limit = in + col_size;
    	w.ptr = out - 1;
    	w.limit = w.ptr + OUT_SIZE;
	/* Decoder must encode line for line, so init it for each line */
	code = (*temp->init) (ss);
	if (code < 0)
	    return_error(gs_error_limitcheck);
	/* Now, get the bits and encode them */
	gdev_prn_copy_scan_lines(pdev, lnum, in, in_size);
	if (col_size > in_size) {
	    memset(in + in_size , 0, col_size - in_size);
        }
	code = (*temp->process) (ss, &r, &w, 1 /* always last line */);
	nbytes = w.ptr - out + 1;
	if (!nul) {
	    if (nbytes > 0) {
		if (nbytes < 217) {
		    cfax_byte(nbytes, prn_stream);
		    for (i = 0; i < nbytes; i++)
			  cfax_byte(out[i], prn_stream);
		} else {
		    cfax_byte(0, prn_stream);
		    cfax_word(nbytes, prn_stream);
		    for (i = 0; i < nbytes; i++)
			  cfax_byte(out[i], prn_stream);
		}
	    } else {
		cfax_byte(218, prn_stream);
	    }
	} 
	if (temp->release != 0)
	    (*temp->release) (ss);
    }
#undef OUT_SIZE

  done:
    gs_free_object(mem, out, "cfax_stream_print_page(out)");
    gs_free_object(mem, in, "cfax_stream_print_page(in)");
    return code;
}

/* Begin a capi fax page. */
private int
cfax_begin_page(gx_device_printer * pdev, FILE * fp, int width)
{
    /* Patch the width to reflect fax page width adjustment. */
    int save_width = pdev->width;

    pdev->width = width;
    if (gdev_prn_file_is_new(pdev)) {
	cfax_doc_hdr(fp);
    }
    cfax_page_hdr(pdev, fp);

    pdev->width = save_width;
    return 0;
}

/* Print an capi fax (sff-encoded) page. */
private int
cfax_print_page(gx_device_printer * pdev, FILE * prn_stream)
{
    stream_CFE_state state;
    int code;

    gdev_fax_init_fax_state(&state, (gx_device_fax *)pdev);
    state.EndOfLine = false;
    state.EndOfBlock = false;
    state.EncodedByteAlign = true;
    state.FirstBitLowOrder = true;
    state.K = 0;

    cfax_begin_page(pdev, prn_stream, state.Columns);
    code = cfax_stream_print_page_width(pdev, prn_stream, 
      &s_CFE_template, (stream_state *) &state, state.Columns);
    return code;
}

/* Close an capi fax (sff-encoded) document. */
private int
cfax_prn_close(gx_device * pdev)
{
    gx_device_printer * const ppdev = (gx_device_printer *)pdev;

    if (ppdev->file != NULL) {
      cfax_doc_end(ppdev->file);
    }
    return gdev_prn_close(pdev);
}