File: mode_strip.c

package info (click to toggle)
shntool 3.0.10-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid, stretch
  • size: 1,220 kB
  • ctags: 1,118
  • sloc: ansic: 8,515; sh: 3,761; makefile: 36
file content (265 lines) | stat: -rw-r--r-- 7,201 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
/*  mode_strip.c - strip mode module
 *  Copyright (C) 2000-2009  Jason Jordan <shnutils@freeshell.org>
 *
 *  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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include "mode.h"

CVSID("$Id: mode_strip.c,v 1.105 2009/03/17 17:23:05 jason Exp $")

static bool strip_main(int,char **);
static void strip_help(void);

mode_module mode_strip = {
  "strip",
  "shnstrip",
  "Strips extra RIFF chunks and/or writes canonical headers",
  CVSIDSTR,
  TRUE,
  strip_main,
  strip_help
};

#define STRIP_POSTFIX "-stripped"

static bool strip_header = TRUE;
static bool strip_chunks = TRUE;

static void strip_help()
{
  st_info("Usage: %s [OPTIONS] [files]\n",st_progname());
  st_info("\n");
  st_info("Mode-specific options:\n");
  st_info("\n");
  st_info("  -c      don't strip unnecessary RIFF chunks\n");
  st_info("  -e      don't rewrite WAVE header in canonical format\n");
  st_info("  -h      show this help screen\n");
  st_info("\n");
}

static void parse(int argc,char **argv,int *first_arg)
{
  int c;

  st_ops.output_directory = INPUT_FILE_DIR;
  st_ops.output_postfix = STRIP_POSTFIX;

  while ((c = st_getopt(argc,argv,"ce")) != -1) {
    switch (c) {
      case 'c':
        strip_chunks = FALSE;
        break;
      case 'e':
        strip_header = FALSE;
        break;
    }
  }

  if (!strip_header && !strip_chunks)
    st_help("nothing to do if not stripping headers or RIFF chunks\n");

  *first_arg = optind;
}

static bool strip_and_canonicize(wave_info *info)
{
  wint new_header_size;
  wlong new_chunk_size;
  unsigned char *header = NULL;
  char outfilename[FILENAME_SIZE];
  FILE *output = NULL;
  proc_info output_proc;
  long possible_extra_stuff;
  bool has_null_pad,success;
  progress_info proginfo;

  success = FALSE;

  create_output_filename(info->filename,info->input_format->extension,outfilename);

  proginfo.initialized = FALSE;
  proginfo.prefix = "Stripping";
  proginfo.clause = "-->";
  proginfo.filename1 = info->filename;
  proginfo.filedesc1 = info->m_ss;
  proginfo.filename2 = outfilename;
  proginfo.filedesc2 = NULL;
  proginfo.bytes_total = info->total_size;

  prog_update(&proginfo);

  if (PROB_HDR_INCONSISTENT(info)) {
    prog_error(&proginfo);
    st_warning("file has an inconsistent header -- skipping.");
    return FALSE;
  }

  if (PROB_TRUNCATED(info)) {
    prog_error(&proginfo);
    st_warning("file seems to be truncated -- skipping.");
    return FALSE;
  }

  if (strip_header && strip_chunks && !PROB_EXTRA_CHUNKS(info) && !PROB_HDR_NOT_CANONICAL(info)) {
    prog_error(&proginfo);
    st_warning("file already has a canonical header and no extra RIFF chunks -- skipping.");
    return FALSE;
  }

  if (strip_chunks && !strip_header && !PROB_EXTRA_CHUNKS(info)) {
    prog_error(&proginfo);
    st_warning("file already has no extra RIFF chunks -- skipping.");
    return FALSE;
  }

  if (strip_header && !strip_chunks && !PROB_HDR_NOT_CANONICAL(info)) {
    prog_error(&proginfo);
    st_warning("file already has a canonical header -- skipping.");
    return FALSE;
  }

  if (files_are_identical(info->filename,outfilename)) {
    prog_error(&proginfo);
    st_warning("output file would overwrite input file -- skipping.");
    return FALSE;
  }

  has_null_pad = odd_sized_data_chunk_is_null_padded(info);

  if (!has_null_pad)
    info->extra_riff_size++;

  new_header_size = info->header_size;
  possible_extra_stuff = (info->extra_riff_size > 0) ? info->extra_riff_size : 0;

  if (strip_header)
    new_header_size = CANONICAL_HEADER_SIZE;

  if (strip_chunks)
    possible_extra_stuff = 0;

  new_chunk_size = info->chunk_size - (info->header_size - new_header_size) - (info->extra_riff_size - possible_extra_stuff);

  if (!open_input_stream(info)) {
    prog_error(&proginfo);
    st_warning("could not reopen input file -- skipping.");
    return FALSE;
  }

  if (NULL == (output = open_output_stream(outfilename,&output_proc))) {
    prog_error(&proginfo);
    st_warning("could not open output file -- skipping.");
    goto cleanup;
  }

  if (NULL == (header = malloc(info->header_size * sizeof(unsigned char)))) {
    prog_error(&proginfo);
    st_warning("could not allocate %d-byte WAVE header -- skipping.",info->header_size);
    goto cleanup;
  }

  if (read_n_bytes(info->input,header,info->header_size,NULL) != info->header_size) {
    prog_error(&proginfo);
    st_warning("error while reading %d bytes of data -- skipping.",info->header_size);
    goto cleanup;
  }

  /* already read in header, now check to see if we need to overwrite that with a canonical one */
  if (strip_header)
    make_canonical_header(header,info);

  put_chunk_size(header,new_chunk_size);

  if (write_n_bytes(output,header,new_header_size,NULL) != new_header_size) {
    prog_error(&proginfo);
    st_warning("error while writing %d bytes of data -- skipping.",new_header_size);
    goto cleanup;
  }

  if (transfer_n_bytes(info->input,output,info->data_size,NULL) != info->data_size) {
    prog_error(&proginfo);
    st_warning("error while transferring %lu bytes of data -- skipping.",info->data_size);
    goto cleanup;
  }

  if (PROB_ODD_SIZED_DATA(info) && has_null_pad && (1 != transfer_n_bytes(info->input,output,1,NULL))) {
    prog_error(&proginfo);
    st_warning("error while transferring NULL pad byte -- skipping.");
    goto cleanup;
  }

  if ((possible_extra_stuff > 0) && (transfer_n_bytes(info->input,output,possible_extra_stuff,NULL) != possible_extra_stuff)) {
    prog_error(&proginfo);
    st_warning("error while transferring %lu extra bytes -- skipping.",possible_extra_stuff);
    goto cleanup;
  }

  success = TRUE;

  prog_success(&proginfo);

cleanup:
  st_free(header);

  if ((output) && ((CLOSE_CHILD_ERROR_OUTPUT == close_output(output,output_proc)) || !success)) {
    success = FALSE;
    remove_file(outfilename);
  }

  close_input_stream(info);

  return success;
}

static bool process_file(char *filename)
{
  wave_info *info;
  bool success;

  if (NULL == (info = new_wave_info(filename)))
    return FALSE;

  success = strip_and_canonicize(info);

  st_free(info);

  return success;
}

static bool process(int argc,char **argv,int start)
{  
  char *filename;
  bool success;

  success = TRUE;

  input_init(start,argc,argv);

  while ((filename = input_get_filename())) {
    success = (process_file(filename) && success);
  }

  return success;
}

static bool strip_main(int argc,char **argv)
{
  int first_arg;

  parse(argc,argv,&first_arg);

  return process(argc,argv,first_arg);
}