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
|
#include "../../common.h"
#include "chunk_file.h"
#include <stdlib.h>
#include <string.h>
#define PARAM_HEADER_SIZE 16
static size_t read_chunk_header_plain(FILE *fp, int *status) {
static char buff[PARAM_HEADER_SIZE];
int i;
size_t size = 0;
if (fread(buff, 1, PARAM_HEADER_SIZE, fp) != PARAM_HEADER_SIZE)
{
if (feof(fp)) *status = CF_END_OF_FILE;
else
{
*status = CF_INVALID_FORMAT;
return 0;
}
}
else *status = CF_NORMAL;
for (i = 0; i < PARAM_HEADER_SIZE; i++)
if (isdigit(buff[i]))
size = size * 10 + buff[i] - '0';
/* fprintf(stderr, "header: %lu\n", size); */
return size;
}
static void write_chunk_header_plain(FILE *fp, size_t size, int *status) {
static char buff[PARAM_HEADER_SIZE];
int i;
for (i = PARAM_HEADER_SIZE - 3; i > 0; i--, size /= 10)
buff[i] = size % 10 + '0';
if (size)
{
*status = CF_SECTION_OVERFLOW;
return;
}
buff[0] = '[';
buff[PARAM_HEADER_SIZE - 2] = ']';
buff[PARAM_HEADER_SIZE - 1] = '\n';
if (fwrite(buff, 1, PARAM_HEADER_SIZE, fp) != PARAM_HEADER_SIZE)
{
*status = CF_WRITE_ERROR;
return;
}
*status = CF_NORMAL;
}
static ChunkData *get_chunk_data(FILE *fp, ChunkInfo *info) {
ChunkData *cdp = (ChunkData *)malloc(sizeof(ChunkData));
cdp->data = (char *)malloc(info->length);
cdp->fp = fmemopen(cdp->data, info->length, "r");
assert(fseeko(fp, info->offset, SEEK_SET) == 0);
if (fread(cdp->data, 1, info->length, fp) != (size_t)info->length)
return NULL;
return cdp;
}
static const char *read_chunk_metadata(FILE *fp, const char *fn, int *status) {
#define LINEBUFF_SIZE 1024
#define LUA_RETURN "return "
#define LUA_RETURN_LEN (sizeof(LUA_RETURN) - 1)
static char buff[LUA_RETURN_LEN + LINEBUFF_SIZE] = LUA_RETURN;
*status = fgets(buff + LUA_RETURN_LEN,
LINEBUFF_SIZE, fp) == (buff + LUA_RETURN_LEN) ? \
CF_NORMAL : CF_INVALID_FORMAT;
fprintf(stderr, "metadata: %s\n", buff);
return buff;
}
static void write_chunk_metadata(FILE *fp, const char *mdstr, int *status) {
size_t size = strlen(mdstr);
if (fwrite(mdstr, 1, size, fp) != size ||
fprintf(fp, "\n") < 0)
{
*status = CF_WRITE_ERROR;
return;
}
/* fprintf(stderr, "metadata: %s\n", metadata_str); */
*status = CF_NORMAL;
}
static ChunkFile *open_write(const char *fn, int *status) {
ChunkFile *cfp;
FILE *fp = fopen(fn, "w");
if (!fp)
{
*status = CF_ERR_OPEN_FILE;
return NULL;
}
cfp = (ChunkFile *)malloc(sizeof(ChunkFile));
cfp->fp = fp;
cfp->status = CF_WRITE;
*status = CF_NORMAL;
return cfp;
}
static ChunkFile *open_read(const char *fn, int *status) {
size_t chunk_len;
off_t offset;
int i;
const char *mdstr;
ChunkFile *cfp;
ChunkInfo *head = NULL;
FILE *fp = fopen(fn, "r");
if (!fp)
{
*status = CF_ERR_OPEN_FILE;
return NULL;
}
cfp = (ChunkFile *)malloc(sizeof(ChunkFile));
cfp->fp = fp;
cfp->status = CF_READ;
offset = ftello(fp);
/* fprintf(stderr, "%d\n", (int)offset); */
for (i = 0;; offset += chunk_len, i++)
{
ChunkInfo *cip;
fprintf(stderr, "reading chunk %d from %d\n", i, (int)offset);
/* skip to the begining of chunk i */
if (fseeko(fp, offset, SEEK_SET) != 0)
{
*status = CF_INVALID_FORMAT;
return NULL;
}
/* read header */
chunk_len = read_chunk_header_plain(fp, status);
if (*status == CF_END_OF_FILE) break;
if (*status != CF_NORMAL)
return NULL;
cip = (ChunkInfo *)malloc(sizeof(ChunkInfo));
/* read metadata */
mdstr = read_chunk_metadata(fp, fn, status);
if (*status != CF_NORMAL)
return NULL;
cip->metadata = strdup(mdstr);
cip->offset = ftello(fp);
cip->length = chunk_len - (cip->offset - offset);
/* fprintf(stderr, "%d + %d (skip %lu)\n", (int)cip->offset,
(int)cip->length, chunk_len); */
cip->next = head;
head = cip;
}
*status = CF_NORMAL;
cfp->info = head;
return cfp;
}
ChunkFile *nerv_chunk_file_create(const char *fn, const char *mode, int *status) {
int rd = 1, bin = 0;
size_t i, len = strlen(mode);
for (i = 0; i < len; i++)
switch (mode[i])
{
case 'r': rd = 1; break;
case 'w': rd = 0; break;
case 'b': bin = 1; break;
}
return rd ? open_read(fn, status) : \
open_write(fn, status);
}
int nerv_chunk_file_write_chunkdata(ChunkFile *cfp, const char *mdstr,
ChunkDataWriter_t writer, void *writer_arg) {
int status;
off_t start;
size_t size;
if (cfp->status != CF_WRITE)
return CF_INVALID_OP;
start = ftello(cfp->fp);
write_chunk_header_plain(cfp->fp, 0, &status); /* fill zeros */
if (status != CF_NORMAL) return status;
write_chunk_metadata(cfp->fp, mdstr, &status);
if (status != CF_NORMAL) return status;
writer(writer_arg);
size = ftello(cfp->fp) - start;
fseeko(cfp->fp, start, SEEK_SET);
/* write the calced size */
write_chunk_header_plain(cfp->fp, size, &status);
if (status != CF_NORMAL) return status;
fseeko(cfp->fp, 0, SEEK_END);
return CF_NORMAL;
}
ChunkData *nerv_chunk_file_get_chunkdata(ChunkFile *cfp, ChunkInfo *cip, int *status) {
ChunkData *cdp;
if (cfp->status != CF_READ)
{
*status = CF_INVALID_OP;
return NULL;
}
if (!(cdp = get_chunk_data(cfp->fp, cip)))
{
*status = CF_END_OF_FILE;
return NULL;
}
*status = CF_NORMAL;
return cdp;
}
void nerv_chunk_file_close(ChunkFile *cfp) {
if (cfp->status != CF_CLOSED)
fclose(cfp->fp);
cfp->status = CF_CLOSED;
}
void nerv_chunk_file_destroy(ChunkFile *cfp) {
ChunkInfo *i, *ni;
if (cfp->status != CF_CLOSED) fclose(cfp->fp);
for (i = cfp->info; i; i = ni)
{
ni = i->next;
free(i->metadata);
free(i);
}
free(cfp);
}
void nerv_chunk_data_destroy(ChunkData *cdp) {
fclose(cdp->fp);
free(cdp->data);
free(cdp);
}
const char *nerv_chunk_file_errstr(int status) {
switch (status)
{
case CF_INVALID_FORMAT: return "invalid format";
case CF_END_OF_FILE: return "unexpected end of file";</
|