/[public]/psiconv/trunk/lib/psiconv/parse_simple.c
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Contents of /psiconv/trunk/lib/psiconv/parse_simple.c

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Revision 79 - (show annotations)
Mon Dec 25 22:25:33 2000 UTC (23 years, 3 months ago) by frodo
File MIME type: text/plain
File size: 8257 byte(s)
(Frodo) Added a complete buffer abstraction

1 /*
2 parse_simple.c - Part of psiconv, a PSION 5 file formats converter
3 Copyright (c) 1999, 2000 Frodo Looijaard <frodol@dds.nl>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20 #include "config.h"
21 #include "compat.h"
22
23 #include <stdlib.h>
24
25 #include "parse_routines.h"
26 #include "error.h"
27
28 psiconv_u8 psiconv_read_u8(const psiconv_buffer buf,int lev,psiconv_u32 off,
29 int *status)
30 {
31 psiconv_u8 *ptr;
32 ptr = psiconv_buffer_get(buf,off);
33 if (!ptr) {
34 psiconv_warn(lev,off,"Trying byte read past the end of the file");
35 if (status)
36 *status = -PSICONV_E_PARSE;
37 return 0;
38 }
39 if (status)
40 *status = 0;
41 return *ptr;
42 }
43
44 psiconv_u16 psiconv_read_u16(const psiconv_buffer buf,int lev,psiconv_u32 off,
45 int *status)
46 {
47 psiconv_u8 *ptr0,*ptr1;
48 ptr0 = psiconv_buffer_get(buf,off);
49 ptr1 = psiconv_buffer_get(buf,off+1);
50 if (!ptr0 || !ptr1) {
51 psiconv_warn(lev,off,"Trying word read past the end of the file");
52 if (status)
53 *status = -PSICONV_E_PARSE;
54 return 0;
55 }
56 if (status)
57 *status = 0;
58 return *ptr0 + (*ptr1 << 8);
59 }
60
61 psiconv_u32 psiconv_read_u32(const psiconv_buffer buf,int lev,psiconv_u32 off,
62 int *status)
63 {
64 psiconv_u8 *ptr0,*ptr1,*ptr2,*ptr3;
65 ptr0 = psiconv_buffer_get(buf,off);
66 ptr1 = psiconv_buffer_get(buf,off+1);
67 ptr2 = psiconv_buffer_get(buf,off+2);
68 ptr3 = psiconv_buffer_get(buf,off+3);
69 if (!ptr0 || !ptr1 || !ptr2 || !ptr3) {
70 psiconv_warn(lev,off,"Trying long read past the end of the file");
71 if (status)
72 *status = -PSICONV_E_PARSE;
73 return 0;
74 }
75 if (status)
76 *status = 0;
77 return *ptr0 + (*ptr1 << 8) + (*ptr2 << 16) + (*ptr3 << 24);
78 }
79
80 psiconv_S_t psiconv_read_S(const psiconv_buffer buf, int lev, psiconv_u32 off,
81 int *length,int *status)
82 {
83 psiconv_u8 temp;
84 psiconv_S_t res;
85 int len,localstatus;
86
87 psiconv_progress(lev+1,off,"Going to read a S length indicator");
88 temp = psiconv_read_u8(buf,lev+2,off,&localstatus);
89 if (localstatus)
90 goto ERROR;
91 if ((temp & 0x03) == 0x02) {
92 res = psiconv_read_u8(buf,lev+2,off,&localstatus) >> 2;
93 if (localstatus)
94 goto ERROR;
95 len = 1;
96 psiconv_debug(lev+2,off,"Indicator (1 byte): %02x",res);
97 } else if ((temp & 0x07) == 0x03) {
98 res = psiconv_read_u16(buf,lev+2,off,&localstatus) >> 3;
99 if (localstatus)
100 goto ERROR;
101 len = 2;
102 psiconv_debug(lev+2,off,"Indicator (2 bytes): %04x",res);
103 } else {
104 psiconv_warn(lev+2,off,"S indicator: unknown encoding!");
105 psiconv_debug(lev+2,off,"Raw data first byte: %02x",temp);
106 goto ERROR;
107 }
108
109 if (length)
110 *length = len;
111 if (status)
112 *status = 0;
113
114 psiconv_progress(lev+1,off+len-1,
115 "End of S length indicator (total length: %08x)", len);
116
117 return res;
118
119 ERROR:
120 psiconv_warn(lev+1,off,"Reading of S indicator failed");
121 if (status)
122 *status = localstatus;
123 if (length)
124 *length = 0;
125 return 0;
126 }
127
128 psiconv_X_t psiconv_read_X(const psiconv_buffer buf, int lev, psiconv_u32 off,
129 int *length, int *status)
130 {
131 psiconv_u8 temp;
132 psiconv_X_t res;
133 int len,localstatus;
134
135 psiconv_progress(lev+1,off,"Going to read a X length indicator");
136 temp = psiconv_read_u8(buf,lev+2,off,&localstatus);
137 if (localstatus)
138 goto ERROR;
139 if ((temp & 0x01) == 0x00) {
140 res = psiconv_read_u8(buf,lev+2,off,&localstatus) >> 1;
141 if (localstatus)
142 goto ERROR;
143 len = 1;
144 psiconv_debug(lev+2,off,"Indicator (1 byte): %02x",res);
145 } else if ((temp & 0x03) == 0x01) {
146 res = psiconv_read_u16(buf,lev+2,off,&localstatus) >> 2;
147 if (localstatus)
148 goto ERROR;
149 len = 2;
150 psiconv_debug(lev+2,off,"Indicator (2 bytes): %04x",res);
151 } else if ((temp & 0x07) == 0x03) {
152 res = psiconv_read_u32(buf,lev+2,off,&localstatus) >> 3;
153 if (localstatus)
154 goto ERROR;
155 len = 4;
156 psiconv_debug(lev+2,off,"Indicator (4 bytes): %08x",res);
157 } else {
158 psiconv_warn(lev+2,off,"X indicator: unknown encoding!");
159 psiconv_debug(lev+2,off,"Raw data first byte: %02x",temp);
160 goto ERROR;
161 }
162
163 if (length)
164 *length = len;
165 if (status)
166 *status = 0;
167
168 psiconv_progress(lev+1,off+len-1,
169 "End of X length indicator (total length: %08x)", len);
170
171 return res;
172
173 ERROR:
174 psiconv_warn(lev+1,off,"Reading of X indicator failed");
175 if (status)
176 *status = localstatus;
177 if (length)
178 *length = 0;
179 return 0;
180 }
181
182 psiconv_length_t psiconv_read_length(const psiconv_buffer buf, int lev,
183 psiconv_u32 off, int *length, int *status)
184 {
185 psiconv_length_t res;
186 int localstatus;
187
188 res = (2.54/1440.0) * ((psiconv_s32) psiconv_read_u32(buf,lev,off,
189 &localstatus));
190 if (localstatus) {
191 psiconv_warn(lev+1,off,"Reading of length failed");
192 if (length)
193 *length = 0;
194 if (status)
195 *status = localstatus;
196 return 0;
197 }
198 psiconv_debug(lev+1,off,"Length: %f",res);
199 if (length)
200 *length = 4;
201 if (status)
202 *status = 0;
203 return res;
204 }
205
206 psiconv_size_t psiconv_read_size(const psiconv_buffer buf, int lev,
207 psiconv_u32 off, int *length, int *status)
208 {
209 psiconv_size_t res;
210 int localstatus;
211 res = ((psiconv_s32) psiconv_read_u32(buf,lev,off,&localstatus)) / 20.0;
212 if (localstatus) {
213 psiconv_warn(lev+1,off,"Reading of size failed");
214 if (length)
215 *length = 0;
216 if (status)
217 *status = localstatus;
218 return 0;
219 }
220 psiconv_debug(lev+1,off,"Size: %f",res);
221 if (status)
222 *status = 0;
223 if (length)
224 *length = 4;
225 return res;
226 }
227
228 int psiconv_parse_bool(const psiconv_buffer buf, int lev, psiconv_u32 off,
229 int *length, psiconv_bool_t *result)
230 {
231 psiconv_u8 temp;
232 int localstatus;
233 temp = psiconv_read_u8(buf,lev,off,&localstatus);
234 if (localstatus) {
235 psiconv_warn(lev+1,off,"Reading of bool failed");
236 if (length)
237 *length = 0;
238 return localstatus;
239 }
240 if (length)
241 *length = 1;
242 if (temp == 0) {
243 *result = psiconv_bool_false;
244 return 0;
245 } else if (temp == 1) {
246 *result = psiconv_bool_true;
247 return 0;
248 }
249 psiconv_warn(lev+1,off,"Unknown value for boolean");
250 psiconv_debug(lev+1,off,"Boolean value: %02x",temp);
251 *result = psiconv_bool_true;
252 return 0;
253 }
254
255 psiconv_string_t psiconv_read_string(const psiconv_buffer buf,int lev,
256 psiconv_u32 off,int *length, int *status)
257 {
258 int stringlen,i,leng,len,localstatus;
259 psiconv_string_t result;
260 char *res_copy;
261
262 psiconv_progress(lev+1,off,"Going to read a string");
263
264 stringlen = psiconv_read_S(buf,lev+2,off,&leng,&localstatus);
265 if (localstatus)
266 goto ERROR1;
267 psiconv_debug(lev+2,off,"Length: %i",stringlen);
268 len = leng;
269
270 result = malloc(stringlen + 1);
271 if (!result)
272 goto ERROR1;
273 for (i = 0; (i < stringlen) && !localstatus; i++)
274 result[i] = psiconv_read_u8(buf,lev,off+i+len,&localstatus);
275 if (localstatus)
276 goto ERROR2;
277 result[stringlen] = 0;
278 len += stringlen;
279
280 res_copy = psiconv_make_printable(result);
281 if (!res_copy)
282 goto ERROR2;
283 psiconv_debug(lev+2,off,"Contents: `%s'",res_copy);
284 free(res_copy);
285
286 if (length)
287 *length = len;
288
289 if (status)
290 *status = 0;
291
292 psiconv_progress(lev+1,off+len-1,"End of string (total length: %08x)",len);
293
294 return result;
295
296 ERROR2:
297 free(result);
298 ERROR1:
299 psiconv_warn(lev+1,off,"Reading of string failed");
300 if (status)
301 *status = localstatus;
302 if (length)
303 *length = 0;
304 return NULL;
305 }

frodo@frodo.looijaard.name
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