1 /*
2 Copyright (C) 2004, 2005, 2011, 2012, 2014, 2016
3 Rocky Bernstein <rocky@gnu.org>
4 Copyright (C) 2000 Herbert Valerio Riedel <hvr@gnu.org>
5
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #ifdef HAVE_CONFIG_H
21 # include "config.h"
22 # define __CDIO_CONFIG_H__ 1
23 #endif
24
25 #include <cdio/sector.h>
26 #include <cdio/util.h>
27 #include <cdio/logging.h>
28 #include "cdio_assert.h"
29 #include "portable.h"
30
31 #ifdef HAVE_STDIO_H
32 #include <stdio.h>
33 #endif
34 #ifdef HAVE_STRING_H
35 #include <string.h>
36 #endif
37
38 #include <ctype.h>
39
40 /*! String of bytes used to identify the beginning of a Mode 1 or
41 Mode 2 sector. */
42 const uint8_t CDIO_SECTOR_SYNC_HEADER[CDIO_CD_SYNC_SIZE] =
43 {0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0};
44
45 /* Variables to hold debugger-helping enumerations */
46 enum cdio_cd_enums;
47 enum m2_sector_enums;
48
49 lba_t
cdio_lba_to_lsn(lba_t lba)50 cdio_lba_to_lsn (lba_t lba)
51 {
52 if (CDIO_INVALID_LBA == lba) return CDIO_INVALID_LSN;
53 return lba - CDIO_PREGAP_SECTORS;
54 }
55
56 /*
57 The below is adapted from cdparanoia code which claims it is
58 straight from the MMC3 spec.
59 */
60
61 void
cdio_lsn_to_msf(lsn_t lsn,msf_t * msf)62 cdio_lsn_to_msf (lsn_t lsn, msf_t *msf)
63 {
64 int m, s, f;
65
66 cdio_assert (msf != 0);
67
68 if ( lsn >= -CDIO_PREGAP_SECTORS ){
69 m = (lsn + CDIO_PREGAP_SECTORS) / CDIO_CD_FRAMES_PER_MIN;
70 lsn -= m * CDIO_CD_FRAMES_PER_MIN;
71 s = (lsn + CDIO_PREGAP_SECTORS) / CDIO_CD_FRAMES_PER_SEC;
72 lsn -= s * CDIO_CD_FRAMES_PER_SEC;
73 f = lsn + CDIO_PREGAP_SECTORS;
74 } else {
75 m = (lsn + CDIO_CD_MAX_LSN) / CDIO_CD_FRAMES_PER_MIN;
76 lsn -= m * (CDIO_CD_FRAMES_PER_MIN);
77 s = (lsn+CDIO_CD_MAX_LSN) / CDIO_CD_FRAMES_PER_SEC;
78 lsn -= s * CDIO_CD_FRAMES_PER_SEC;
79 f = lsn + CDIO_CD_MAX_LSN;
80 }
81
82 if (m > 99) {
83 cdio_warn ("number of minutes (%d) truncated to 99.", m);
84 m = 99;
85 }
86
87 msf->m = cdio_to_bcd8 (m);
88 msf->s = cdio_to_bcd8 (s);
89 msf->f = cdio_to_bcd8 (f);
90 }
91
92 /*!
93 Convert an LBA into a string representation of the MSF.
94 \warning cdio_lba_to_msf_str returns new allocated string */
95 char *
cdio_lba_to_msf_str(lba_t lba)96 cdio_lba_to_msf_str (lba_t lba)
97 {
98
99 if (CDIO_INVALID_LBA == lba) {
100 return strdup("*INVALID");
101 } else {
102 msf_t msf;
103 msf.m = msf.s = msf.f = 0;
104 cdio_lba_to_msf (lba, &msf);
105 return cdio_msf_to_str(&msf);
106 }
107 }
108
109 /*!
110 Convert an LSN into the corresponding LBA.
111 CDIO_INVALID_LBA is returned if there is an error.
112 */
113 lba_t
cdio_lsn_to_lba(lsn_t lsn)114 cdio_lsn_to_lba (lsn_t lsn)
115 {
116 if (CDIO_INVALID_LSN == lsn) return CDIO_INVALID_LBA;
117 return lsn + CDIO_PREGAP_SECTORS;
118 }
119
120 /*!
121 Convert an LBA into the corresponding MSF.
122 */
123 void
cdio_lba_to_msf(lba_t lba,msf_t * msf)124 cdio_lba_to_msf (lba_t lba, msf_t *msf)
125 {
126 cdio_assert (msf != 0);
127 cdio_lsn_to_msf(cdio_lba_to_lsn(lba), msf);
128 }
129
130 /*!
131 Convert a MSF into the corresponding LBA.
132 CDIO_INVALID_LBA is returned if there is an error.
133 */
134 lba_t
cdio_msf_to_lba(const msf_t * msf)135 cdio_msf_to_lba (const msf_t *msf)
136 {
137 uint32_t lba = 0;
138
139 cdio_assert (msf != 0);
140
141 lba = cdio_from_bcd8 (msf->m);
142 lba *= CDIO_CD_SECS_PER_MIN;
143
144 lba += cdio_from_bcd8 (msf->s);
145 lba *= CDIO_CD_FRAMES_PER_SEC;
146
147 lba += cdio_from_bcd8 (msf->f);
148
149 return lba;
150 }
151
152 /*!
153 Convert a MSF into the corresponding LSN.
154 CDIO_INVALID_LSN is returned if there is an error.
155 */
156 lba_t
cdio_msf_to_lsn(const msf_t * msf)157 cdio_msf_to_lsn (const msf_t *msf)
158 {
159 return cdio_lba_to_lsn(cdio_msf_to_lba (msf));
160 }
161
162 /*!
163 Convert an LBA into a string representation of the MSF.
164 \warning cdio_lba_to_msf_str returns new allocated string */
165 char *
cdio_msf_to_str(const msf_t * msf)166 cdio_msf_to_str (const msf_t *msf)
167 {
168 char buf[16];
169
170 snprintf (buf, sizeof (buf), "%2.2x:%2.2x:%2.2x", msf->m, msf->s, msf->f);
171 return strdup (buf);
172 }
173
174 /*!
175 Convert a MSF - broken out as 3 integer components into the
176 corresponding LBA.
177 CDIO_INVALID_LBA is returned if there is an error.
178 */
179 lba_t
cdio_msf3_to_lba(unsigned int minutes,unsigned int seconds,unsigned int frames)180 cdio_msf3_to_lba (unsigned int minutes, unsigned int seconds,
181 unsigned int frames)
182 {
183 return ((minutes * CDIO_CD_SECS_PER_MIN + seconds) * CDIO_CD_FRAMES_PER_SEC
184 + frames);
185 }
186
187 /*!
188 Convert a string of the form MM:SS:FF into the corresponding LBA.
189 CDIO_INVALID_LBA is returned if there is an error.
190 */
191 lba_t
cdio_mmssff_to_lba(const char * psz_mmssff)192 cdio_mmssff_to_lba (const char *psz_mmssff)
193 {
194 int psz_field;
195 lba_t ret;
196 unsigned char c;
197
198 if (0 == strcmp (psz_mmssff, "0"))
199 return 0;
200
201 c = *psz_mmssff++;
202 if(c >= '0' && c <= '9')
203 psz_field = (c - '0');
204 else
205 return CDIO_INVALID_LBA;
206 while(':' != (c = *psz_mmssff++)) {
207 if(c >= '0' && c <= '9')
208 psz_field = psz_field * 10 + (c - '0');
209 else
210 return CDIO_INVALID_LBA;
211 }
212
213 ret = cdio_msf3_to_lba (psz_field, 0, 0);
214
215 c = *psz_mmssff++;
216 if(c >= '0' && c <= '9')
217 psz_field = (c - '0');
218 else
219 return CDIO_INVALID_LBA;
220 if(':' != (c = *psz_mmssff++)) {
221 if(c >= '0' && c <= '9') {
222 psz_field = psz_field * 10 + (c - '0');
223 c = *psz_mmssff++;
224 if(c != ':')
225 return CDIO_INVALID_LBA;
226 }
227 else
228 return CDIO_INVALID_LBA;
229 }
230
231 if(psz_field >= CDIO_CD_SECS_PER_MIN)
232 return CDIO_INVALID_LBA;
233
234 ret += cdio_msf3_to_lba (0, psz_field, 0);
235
236 c = *psz_mmssff++;
237 if (isdigit(c))
238 psz_field = (c - '0');
239 else
240 return -1;
241 if('\0' != (c = *psz_mmssff++)) {
242 if (isdigit(c)) {
243 psz_field = psz_field * 10 + (c - '0');
244 c = *psz_mmssff++;
245 }
246 else
247 return CDIO_INVALID_LBA;
248 }
249
250 if('\0' != c)
251 return CDIO_INVALID_LBA;
252
253 if(psz_field >= CDIO_CD_FRAMES_PER_SEC)
254 return CDIO_INVALID_LBA;
255
256 ret += psz_field;
257
258 return ret;
259 }
260
261
262 /*
263 * Local variables:
264 * c-file-style: "gnu"
265 * tab-width: 8
266 * indent-tabs-mode: nil
267 * End:
268 */
269