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
|
#include "zebra.h"
#include <stdio.h> /* for FILE */
#include <stdlib.h> /* for size_t */
#include "pack2b.h"
#include <string.h> /* for memmove() */
#include <stdint.h> /* for uint8_t, etc. */
#include <errno.h> /* for strerror(), etc. */
char zebra_err[256];
zebraFile *zebra_open(const char *filename)
{
FILE *f = fopen(filename, "r");
if (!f) {
sprintf(zebra_err, "failed to open '%s': %s", filename, strerror(errno));
return NULL;
}
zebraFile *z = (zebraFile *) malloc(sizeof(zebraFile));
z->f = f;
z->offset = 0;
z->lr_size = 0;
z->buf = NULL;
z->buf_size = 0;
return z;
}
int read_next_physical_record(zebraFile *z)
{
/* Read the next physical record from the zebra file and append it to the
* buffer.
*
* Returns 0 on success, -1 on error, and 1 on EOF. */
uint8_t buf[48];
size_t nbytes;
uint32_t s0, s1, s2, s3, nwphr, nfast;
nbytes = fread(buf,4,8,z->f);
if (nbytes == 0) return 1;
if (nbytes != 8) {
sprintf(zebra_err, "expected %i words but only read %zu", 8, nbytes);
return -1;
}
s0 = unpacki32(buf);
s1 = unpacki32(buf+4*1);
s2 = unpacki32(buf+4*2);
s3 = unpacki32(buf+4*3);
nwphr = unpacki32(buf+4*4);
nfast = unpacki32(buf+7*4);
if (nwphr & (ZEBRA_EMERGENCY_STOP | ZEBRA_END_OF_RUN))
return 1;
nwphr &= ZEBRA_BLOCK_SIZE_MASK;
uint32_t words = nwphr*(1 + nfast) - 8;
if (s0 != ZEBRA_SIG0) {
sprintf(zebra_err, "invalid steering block stamp 0x%08x", s0);
return -1;
}
if (s1 != ZEBRA_SIG1) {
sprintf(zebra_err, "invalid steering block stamp 0x%08x", s1);
return -1;
}
if (s2 != ZEBRA_SIG2) {
sprintf(zebra_err, "invalid steering block stamp 0x%08x", s2);
return -1;
}
if (s3 != ZEBRA_SIG3) {
sprintf(zebra_err, "invalid steering block stamp 0x%08x", s3);
return -1;
}
z->buf = realloc(z->buf, z->buf_size+words*4);
nbytes = fread(z->buf+z->buf_size, 4, words, z->f);
z->buf_size += words*4;
if (nbytes != words) {
sprintf(zebra_err, "expected %i words but only read %zu", words, nbytes);
return -1;
}
return 0;
}
int get_bytes(zebraFile *z, size_t size)
{
/* Read bytes from the zdab file until there are at least `size` words in
* the buffer.
*
* Returns 0 on success, -1 on error, and 1 on EOF. */
int rv;
while ((z->buf_size - z->offset) < size*4) {
rv = read_next_physical_record(z);
if (rv == -1) {
return -1;
} else if (z->buf_size == 0 && rv == 1) {
/* EOF and there are no bytes left. */
return 1;
}
}
return 0;
}
int read_next_logical_record(zebraFile *z)
{
/* Read the next logical record into the buffer.
*
* Returns 0 on success, -1 on error, and 1 on EOF. */
uint32_t size, type, nwtx, nwseg, nwtab, nwuh;
while (1) {
memmove(z->buf,z->buf+z->offset,z->buf_size-z->offset);
z->buf = realloc(z->buf, z->buf_size-z->offset);
z->buf_size -= z->offset;
z->offset = 0;
switch (get_bytes(z,1)) {
case 1:
return 1;
case -1:
return -1;
}
size = unpacki32(z->buf+z->offset);
z->offset += 4;
if (size == 0) continue;
switch (get_bytes(z,1)) {
case 1:
return 1;
case -1:
return -1;
}
type = unpacki32(z->buf+z->offset);
z->offset += 4;
switch (type) {
case 5:
case 6:
get_bytes(z,size-1);
z->offset += (size-1)*4;
continue;
case 1:
get_bytes(z,size);
z->offset += size*4;
continue;
}
z->lr_size = (size + 2)*4;
get_bytes(z,size);
nwtx = unpacki32(z->buf+z->offset+4*4);
nwseg = unpacki32(z->buf+z->offset+5*4);
nwtab = unpacki32(z->buf+z->offset+6*4);
nwuh = unpacki32(z->buf+z->offset+9*4);
z->offset += 10*4;
z->offset += nwtx*4;
z->offset += nwseg*4;
z->offset += nwtab*4;
z->offset += nwuh*4;
break;
}
return 0;
}
int next_bank(zebraFile *z, bank *b)
{
int rv;
uint32_t io, noff;
if (z->offset == z->lr_size) {
rv = read_next_logical_record(z);
if (rv) return rv;
}
io = unpacki32(z->buf+z->offset);
z->offset += 4;
noff = io & 0xFFFF;
if (noff > 12) {
z->offset += (noff-12)*4;
}
unpack(z->buf+z->offset,"lllllllll",&b->next, &b->up, &b->orig, &b->number, &b->name, &b->num_links, &b->num_structural_links, &b->num_data_words, &b->status);
z->offset += 9*4;
b->data = (uint32_t *) (z->buf+z->offset);
z->offset += b->num_data_words*4;
return 0;
}
void zebra_close(zebraFile *z)
{
fclose(z->f);
if (z->buf) free(z->buf);
free(z);
}
|
