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- /* Copyright (C) 1993, 2000 Aladdin Enterprises. All rights reserved.
-
- This software is provided AS-IS with no warranty, either express or
- implied.
-
- This software is distributed under license and may not be copied,
- modified or distributed except as expressly authorized under the terms
- of the license contained in the file LICENSE in this distribution.
-
- For more information about licensing, please refer to
- http://www.ghostscript.com/licensing/. For information on
- commercial licensing, go to http://www.artifex.com/licensing/ or
- contact Artifex Software, Inc., 101 Lucas Valley Road #110,
- San Rafael, CA 94903, U.S.A., +1(415)492-9861.
- */
- /* $Id: sbcp.c,v 1.5 2002/02/21 22:24:53 giles Exp $ */
- /* BCP and TBCP filters */
- #include "stdio_.h"
- #include "strimpl.h"
- #include "sbcp.h"
- #define CtrlA 0x01
- #define CtrlC 0x03
- #define CtrlD 0x04
- #define CtrlE 0x05
- #define CtrlQ 0x11
- #define CtrlS 0x13
- #define CtrlT 0x14
- #define ESC 0x1b
- #define CtrlBksl 0x1c
- /* The following is not used yet. */
- /*private const char *TBCP_end_protocol_string = "\033%-12345X"; */
- /* ------ BCPEncode and TBCPEncode ------ */
- /* Process a buffer */
- private int
- s_xBCPE_process(stream_state * st, stream_cursor_read * pr,
- stream_cursor_write * pw, bool last, const byte * escaped)
- {
- const byte *p = pr->ptr;
- const byte *rlimit = pr->limit;
- uint rcount = rlimit - p;
- byte *q = pw->ptr;
- uint wcount = pw->limit - q;
- const byte *end = p + min(rcount, wcount);
- while (p < end) {
- byte ch = *++p;
- if (ch <= 31 && escaped[ch]) {
- if (p == rlimit) {
- p--;
- break;
- }
- *++q = CtrlA;
- ch ^= 0x40;
- if (--wcount < rcount)
- end--;
- }
- *++q = ch;
- }
- pr->ptr = p;
- pw->ptr = q;
- return (p == rlimit ? 0 : 1);
- }
- /* Actual process procedures */
- private int
- s_BCPE_process(stream_state * st, stream_cursor_read * pr,
- stream_cursor_write * pw, bool last)
- {
- static const byte escaped[32] =
- {
- 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0
- };
- return s_xBCPE_process(st, pr, pw, last, escaped);
- }
- private int
- s_TBCPE_process(stream_state * st, stream_cursor_read * pr,
- stream_cursor_write * pw, bool last)
- {
- static const byte escaped[32] =
- {
- 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0
- };
- return s_xBCPE_process(st, pr, pw, last, escaped);
- }
- /* Stream templates */
- const stream_template s_BCPE_template =
- {&st_stream_state, NULL, s_BCPE_process, 1, 2
- };
- const stream_template s_TBCPE_template =
- {&st_stream_state, NULL, s_TBCPE_process, 1, 2
- };
- /* ------ BCPDecode and TBCPDecode ------ */
- private_st_BCPD_state();
- /* Initialize the state */
- private int
- s_BCPD_init(stream_state * st)
- {
- stream_BCPD_state *const ss = (stream_BCPD_state *) st;
- ss->escaped = 0;
- ss->matched = ss->copy_count = 0;
- return 0;
- }
- /* Process a buffer */
- private int
- s_xBCPD_process(stream_state * st, stream_cursor_read * pr,
- stream_cursor_write * pw, bool last, bool tagged)
- {
- stream_BCPD_state *const ss = (stream_BCPD_state *) st;
- const byte *p = pr->ptr;
- const byte *rlimit = pr->limit;
- byte *q = pw->ptr;
- byte *wlimit = pw->limit;
- int copy_count = ss->copy_count;
- int status;
- bool escaped = ss->escaped;
- for (;;) {
- byte ch;
- if (copy_count) {
- if (q == wlimit) {
- status = (p < rlimit ? 1 : 0);
- break;
- }
- *++q = *++(ss->copy_ptr);
- copy_count--;
- continue;
- }
- if (p == rlimit) {
- status = 0;
- break;
- }
- ch = *++p;
- if (ch <= 31)
- switch (ch) {
- case CtrlA:
- if (escaped) {
- status = ERRC;
- goto out;
- }
- escaped = true;
- continue;
- case CtrlC:
- status = (*ss->signal_interrupt) (st);
- if (status < 0)
- goto out;
- continue;
- case CtrlD:
- if (escaped) {
- status = ERRC;
- goto out;
- }
- status = EOFC;
- goto out;
- case CtrlE:
- continue;
- case CtrlQ:
- continue;
- case CtrlS:
- continue;
- case CtrlT:
- status = (*ss->request_status) (st);
- if (status < 0)
- goto out;
- continue;
- case CtrlBksl:
- continue;
- }
- if (q == wlimit) {
- p--;
- status = 1;
- break;
- }
- if (escaped) {
- escaped = false;
- switch (ch) {
- case '[':
- if (!tagged) {
- status = ERRC;
- goto out;
- }
- /* falls through */
- case 'A':
- case 'C':
- case 'D':
- case 'E':
- case 'Q':
- case 'S':
- case 'T':
- case '\\':
- ch ^= 0x40;
- break;
- case 'M':
- if (!tagged) {
- status = ERRC;
- goto out;
- }
- continue;
- default:
- status = ERRC;
- goto out;
- }
- }
- *++q = ch;
- }
- out:ss->copy_count = copy_count;
- ss->escaped = escaped;
- pr->ptr = p;
- pw->ptr = q;
- return status;
- }
- /* Actual process procedures */
- private int
- s_BCPD_process(stream_state * st, stream_cursor_read * pr,
- stream_cursor_write * pw, bool last)
- {
- return s_xBCPD_process(st, pr, pw, last, false);
- }
- private int
- s_TBCPD_process(stream_state * st, stream_cursor_read * pr,
- stream_cursor_write * pw, bool last)
- {
- return s_xBCPD_process(st, pr, pw, last, true);
- }
- /* Stream templates */
- const stream_template s_BCPD_template =
- {&st_BCPD_state, s_BCPD_init, s_BCPD_process, 1, 1,
- NULL, NULL, s_BCPD_init
- };
- const stream_template s_TBCPD_template =
- {&st_BCPD_state, s_BCPD_init, s_TBCPD_process, 1, 1,
- NULL, NULL, s_BCPD_init
- };
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