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
|
/******************************************************************
* CopyPolicy: GNU Public License 2 applies
* Copyright (C) Monty xiphmont@mit.edu
*
* Fake interface backend for testing paranoia layer
*
******************************************************************/
#ifdef CDDA_TEST
#include "low_interface.h"
#include "utils.h"
#define CDDA_TEST_JITTER
#define CDDA_TEST_BOGUSBYTES
#define CDDA_TEST_SCRATCHES
static int test_readtoc (cdrom_drive *d){
int tracks=0;
long bytes;
long sectors;
/* only one track, as many sectors as the file */
bytes=lseek(d->cdda_fd,0,SEEK_END);
lseek(d->cdda_fd,0,SEEK_SET);
sectors=bytes/CD_FRAMESIZE_RAW;
d->disc_toc[0].bFlags = 0;
d->disc_toc[0].bTrack = 1;
d->disc_toc[0].dwStartSector = 0;
d->disc_toc[1].bFlags = 0x4;
d->disc_toc[1].bTrack = CDROM_LEADOUT;
d->disc_toc[1].dwStartSector = sectors;
tracks=2;
d->cd_extra=0;
return(--tracks); /* without lead-out */
}
/* we emulate jitter, scratches, atomic jitter and bogus bytes on
boundaries, etc */
static long test_read(cdrom_drive *d, void *p, long begin, long sectors){
int bytes_so_far=0;
char *buffer=(char *)p;
long bytestotal=sectors*CD_FRAMESIZE_RAW;
/*if(begin>=200 && begin<=220){
errno=EIO;
return(-1);
}*/
begin*=CD_FRAMESIZE_RAW;
while(bytes_so_far<bytestotal){
long local_bytes=bytestotal-bytes_so_far;
long rbytes,bytes=bytestotal;
int jitter=10*(int)((drand48()-.5)*CD_FRAMESIZE_RAW);
char *local_buf=buffer+bytes_so_far;
if(bytes>local_bytes)bytes=local_bytes;
if(begin==0)jitter=0;
if(begin+bytes_so_far+jitter<0)jitter=0;
{
long seeki;
/* long bound=23520;
long nextbound=begin+bytes_so_far+bound;
nextbound=nextbound-(nextbound%bound)+12;
if(begin+bytes_so_far+bytes>nextbound){
bytes=nextbound-begin-bytes_so_far;
}*/
/* if(drand48()>.5){
seeki=begin+bytes_so_far+jitter-8;
}else{*/
seeki=begin+bytes_so_far+jitter+8;
if(lseek(d->cdda_fd,seeki,SEEK_SET)<0){
return(bytes_so_far/CD_FRAMESIZE_RAW);
}
rbytes=read(d->cdda_fd,local_buf,bytes);
bytes_so_far+=rbytes;
}
}
return(sectors);
}
/* hook */
static int Dummy (cdrom_drive *d,int Switch){
return(0);
}
/* set function pointers to use the ioctl routines */
int test_init_drive (cdrom_drive *d){
d->nsectors=8;
d->enable_cdda = Dummy;
d->read_audio = test_read;
d->read_toc = test_readtoc;
d->tracks=d->read_toc(d);
if(d->tracks==-1)
return(d->tracks);
d->opened=1;
srand48(0);
return(0);
}
#endif
|
