projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 82f88cbd WJ |
1 | /* Copyright (C) 1991 Aladdin Enterprises. All rights reserved. |
| 2 | Distributed by Free Software Foundation, Inc. | |
| 3 | ||
| 4 | This file is part of Ghostscript. | |
| 5 | ||
| 6 | Ghostscript is distributed in the hope that it will be useful, but | |
| 7 | WITHOUT ANY WARRANTY. No author or distributor accepts responsibility | |
| 8 | to anyone for the consequences of using it or for whether it serves any | |
| 9 | particular purpose or works at all, unless he says so in writing. Refer | |
| 10 | to the Ghostscript General Public License for full details. | |
| 11 | ||
| 12 | Everyone is granted permission to copy, modify and redistribute | |
| 13 | Ghostscript, but only under the conditions described in the Ghostscript | |
| 14 | General Public License. A copy of this license is supposed to have been | |
| 15 | given to you along with Ghostscript so you can know your rights and | |
| 16 | responsibilities. It should be in a file named COPYING. Among other | |
| 17 | things, the copyright notice and this notice must be preserved on all | |
| 18 | copies. */ | |
| 19 | ||
| 20 | /* zfilter2.c */ | |
| 21 | /* Additional filter creation for Ghostscript */ | |
| 22 | #include "ghost.h" | |
| 23 | #include "errors.h" | |
| 24 | #include "oper.h" | |
| 25 | #include "alloc.h" | |
| 26 | #include "stream.h" | |
| 27 | ||
| 28 | /* Imported from zfilter.c */ | |
| 29 | int filter_read(P3(os_ptr, stream_procs _ds *, stream **)); | |
| 30 | int filter_write(P3(os_ptr, stream_procs _ds *, stream **)); | |
| 31 | ||
| 32 | /* .filterASCII85Encode */ | |
| 33 | extern stream_procs s_A85E_procs; | |
| 34 | int | |
| 35 | zA85E(os_ptr op) | |
| 36 | { return filter_write(op, &s_A85E_procs, NULL); | |
| 37 | } | |
| 38 | ||
| 39 | /* .filterASCII85Decode */ | |
| 40 | extern stream_procs s_A85D_procs; | |
| 41 | int | |
| 42 | zA85D(os_ptr op) | |
| 43 | { return filter_read(op, &s_A85D_procs, NULL); | |
| 44 | } | |
| 45 | ||
| 46 | /* .filterNullEncode */ | |
| 47 | extern stream_procs s_NullE_procs; | |
| 48 | int | |
| 49 | zNullE(os_ptr op) | |
| 50 | { return filter_write(op, &s_NullE_procs, NULL); | |
| 51 | } | |
| 52 | ||
| 53 | /* .filterRunLengthEncode */ | |
| 54 | #if 0 /* ****** */ | |
| 55 | extern stream_procs s_RLE_procs; | |
| 56 | extern void s_RLE_init(P2(stream *, uint)); | |
| 57 | int | |
| 58 | zRLE(register os_ptr op) | |
| 59 | { stream *s; | |
| 60 | int code; | |
| 61 | check_type(*op, t_integer); | |
| 62 | if ( (ulong)(op->value.intval) > max_uint ) | |
| 63 | return e_rangecheck; | |
| 64 | code = filter_write(op - 1, &s_RLE_procs, &s); | |
| 65 | if ( code < 0 ) return code; | |
| 66 | s_RLE_init(s, (uint)(op->value.intval)); | |
| 67 | pop(1); | |
| 68 | return 0; | |
| 69 | } | |
| 70 | #endif /* ****** */ | |
| 71 | ||
| 72 | /* .filterRunLengthDecode */ | |
| 73 | #if 0 /* ****** */ | |
| 74 | extern stream_procs s_RLD_procs; | |
| 75 | extern void s_RLD_init(P1(stream *)); | |
| 76 | int | |
| 77 | zRLD(os_ptr op) | |
| 78 | { stream *s; | |
| 79 | int code = filter_write(op, &s_RLD_procs, &s); | |
| 80 | if ( code < 0 ) return code; | |
| 81 | s_RLD_init(s); | |
| 82 | return 0; | |
| 83 | } | |
| 84 | #endif /* ****** */ | |
| 85 | ||
| 86 | /* .filterSubFileDecode */ | |
| 87 | /****** Only implemented for null case (count=0, null string) ******/ | |
| 88 | extern stream_procs s_SFD_procs; | |
| 89 | int | |
| 90 | zSFD(os_ptr op) | |
| 91 | { int code; | |
| 92 | check_type(op[-1], t_integer); | |
| 93 | check_type(*op, t_string); | |
| 94 | if ( op[-1].value.intval < 0 ) return e_rangecheck; | |
| 95 | if ( op[-1].value.intval != 0 || r_size(op) != 0 ) | |
| 96 | return e_undefined; /* NYI */ | |
| 97 | code = filter_read(op - 2, &s_SFD_procs, NULL); | |
| 98 | if ( code < 0 ) return code; | |
| 99 | pop(2); | |
| 100 | return 0; | |
| 101 | } | |
| 102 | ||
| 103 | /* ------ Initialization procedure ------ */ | |
| 104 | ||
| 105 | op_def zfilter2_op_defs[] = { | |
| 106 | {"1.filterASCII85Encode", zA85E}, | |
| 107 | {"1.filterASCII85Decode", zA85D}, | |
| 108 | {"1.filterNullEncode", zNullE}, | |
| 109 | #if 0 /* ****** */ | |
| 110 | {"2.filterRunLengthEncode", zRLE}, | |
| 111 | {"1.filterRunLengthDecode", zRLD}, | |
| 112 | #endif /* ****** */ | |
| 113 | {"1.filterSubFileDecode", zSFD}, | |
| 114 | op_def_end(0) | |
| 115 | }; |