/[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 142 - (show annotations)
Tue Jan 29 18:38:38 2002 UTC (17 years, 9 months ago) by frodo
File MIME type: text/plain
File size: 11300 byte(s)
(Frodo) DMALLOC support

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 #include <math.h>
25
26 #include "parse_routines.h"
27 #include "error.h"
28
29 #ifdef DMALLOC
30 #include <dmalloc.h>
31 #endif
32
33 /* Very inefficient, but good enough for now. By implementing it ourselves,
34 we do not have to link with -lm */
35 psiconv_float_t pow2(int n)
36 {
37 psiconv_float_t res=1.0;
38 int i;
39
40 for (i = 0; i < (n<0?-n:n); i++)
41 res *= 2.0;
42
43 return n<0?1/res:res;
44 }
45 psiconv_u8 psiconv_read_u8(const psiconv_buffer buf,int lev,psiconv_u32 off,
46 int *status)
47 {
48 psiconv_u8 *ptr;
49 ptr = psiconv_buffer_get(buf,off);
50 if (!ptr) {
51 psiconv_warn(lev,off,"Trying byte 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 *ptr;
59 }
60
61 psiconv_u16 psiconv_read_u16(const psiconv_buffer buf,int lev,psiconv_u32 off,
62 int *status)
63 {
64 psiconv_u8 *ptr0,*ptr1;
65 ptr0 = psiconv_buffer_get(buf,off);
66 ptr1 = psiconv_buffer_get(buf,off+1);
67 if (!ptr0 || !ptr1) {
68 psiconv_warn(lev,off,"Trying word read past the end of the file");
69 if (status)
70 *status = -PSICONV_E_PARSE;
71 return 0;
72 }
73 if (status)
74 *status = 0;
75 return *ptr0 + (*ptr1 << 8);
76 }
77
78 psiconv_u32 psiconv_read_u32(const psiconv_buffer buf,int lev,psiconv_u32 off,
79 int *status)
80 {
81 psiconv_u8 *ptr0,*ptr1,*ptr2,*ptr3;
82 ptr0 = psiconv_buffer_get(buf,off);
83 ptr1 = psiconv_buffer_get(buf,off+1);
84 ptr2 = psiconv_buffer_get(buf,off+2);
85 ptr3 = psiconv_buffer_get(buf,off+3);
86 if (!ptr0 || !ptr1 || !ptr2 || !ptr3) {
87 psiconv_warn(lev,off,"Trying long read past the end of the file");
88 if (status)
89 *status = -PSICONV_E_PARSE;
90 return 0;
91 }
92 if (status)
93 *status = 0;
94 return *ptr0 + (*ptr1 << 8) + (*ptr2 << 16) + (*ptr3 << 24);
95 }
96
97 psiconv_s32 psiconv_read_sint(const psiconv_buffer buf,int lev,psiconv_u32 off,
98 int *length,int *status)
99 {
100 int localstatus;
101 psiconv_u32 temp;
102
103 temp=psiconv_read_u32(buf,lev,off,&localstatus);
104 if (status)
105 *status = localstatus;
106 if (length)
107 *length = localstatus?0:4;
108
109 return localstatus?0:(temp & 0x7fffffff)*(temp&0x80000000?-1:1);
110 }
111
112 psiconv_S_t psiconv_read_S(const psiconv_buffer buf, int lev, psiconv_u32 off,
113 int *length,int *status)
114 {
115 psiconv_u8 temp;
116 psiconv_S_t res;
117 int len,localstatus;
118
119 psiconv_progress(lev+1,off,"Going to read a S length indicator");
120 temp = psiconv_read_u8(buf,lev+2,off,&localstatus);
121 if (localstatus)
122 goto ERROR;
123 if ((temp & 0x03) == 0x02) {
124 res = psiconv_read_u8(buf,lev+2,off,&localstatus) >> 2;
125 if (localstatus)
126 goto ERROR;
127 len = 1;
128 psiconv_debug(lev+2,off,"Indicator (1 byte): %02x",res);
129 } else if ((temp & 0x07) == 0x05) {
130 res = psiconv_read_u16(buf,lev+2,off,&localstatus) >> 3;
131 if (localstatus)
132 goto ERROR;
133 len = 2;
134 psiconv_debug(lev+2,off,"Indicator (2 bytes): %04x",res);
135 } else {
136 psiconv_warn(lev+2,off,"S indicator: unknown encoding!");
137 psiconv_debug(lev+2,off,"Raw data first byte: %02x",temp);
138 goto ERROR;
139 }
140
141 if (length)
142 *length = len;
143 if (status)
144 *status = 0;
145
146 psiconv_progress(lev+1,off+len-1,
147 "End of S length indicator (total length: %08x)", len);
148
149 return res;
150
151 ERROR:
152 psiconv_warn(lev+1,off,"Reading of S indicator failed");
153 if (status)
154 *status = localstatus;
155 if (length)
156 *length = 0;
157 return 0;
158 }
159
160 psiconv_X_t psiconv_read_X(const psiconv_buffer buf, int lev, psiconv_u32 off,
161 int *length, int *status)
162 {
163 psiconv_u8 temp;
164 psiconv_X_t res;
165 int len,localstatus;
166
167 psiconv_progress(lev+1,off,"Going to read a X length indicator");
168 temp = psiconv_read_u8(buf,lev+2,off,&localstatus);
169 if (localstatus)
170 goto ERROR;
171 if ((temp & 0x01) == 0x00) {
172 res = psiconv_read_u8(buf,lev+2,off,&localstatus) >> 1;
173 if (localstatus)
174 goto ERROR;
175 len = 1;
176 psiconv_debug(lev+2,off,"Indicator (1 byte): %02x",res);
177 } else if ((temp & 0x03) == 0x01) {
178 res = psiconv_read_u16(buf,lev+2,off,&localstatus) >> 2;
179 if (localstatus)
180 goto ERROR;
181 len = 2;
182 psiconv_debug(lev+2,off,"Indicator (2 bytes): %04x",res);
183 } else if ((temp & 0x07) == 0x03) {
184 res = psiconv_read_u32(buf,lev+2,off,&localstatus) >> 3;
185 if (localstatus)
186 goto ERROR;
187 len = 4;
188 psiconv_debug(lev+2,off,"Indicator (4 bytes): %08x",res);
189 } else {
190 psiconv_warn(lev+2,off,"X indicator: unknown encoding!");
191 psiconv_debug(lev+2,off,"Raw data first byte: %02x",temp);
192 goto ERROR;
193 }
194
195 if (length)
196 *length = len;
197 if (status)
198 *status = 0;
199
200 psiconv_progress(lev+1,off+len-1,
201 "End of X length indicator (total length: %08x)", len);
202
203 return res;
204
205 ERROR:
206 psiconv_warn(lev+1,off,"Reading of X indicator failed");
207 if (status)
208 *status = localstatus;
209 if (length)
210 *length = 0;
211 return 0;
212 }
213
214 psiconv_length_t psiconv_read_length(const psiconv_buffer buf, int lev,
215 psiconv_u32 off, int *length, int *status)
216 {
217 psiconv_length_t res;
218 int localstatus;
219
220 res = (2.54/1440.0) * ((psiconv_s32) psiconv_read_u32(buf,lev,off,
221 &localstatus));
222 if (localstatus) {
223 psiconv_warn(lev+1,off,"Reading of length failed");
224 if (length)
225 *length = 0;
226 if (status)
227 *status = localstatus;
228 return 0;
229 }
230 psiconv_debug(lev+1,off,"Length: %f",res);
231 if (length)
232 *length = 4;
233 if (status)
234 *status = 0;
235 return res;
236 }
237
238 psiconv_size_t psiconv_read_size(const psiconv_buffer buf, int lev,
239 psiconv_u32 off, int *length, int *status)
240 {
241 psiconv_size_t res;
242 int localstatus;
243 res = ((psiconv_s32) psiconv_read_u32(buf,lev,off,&localstatus)) / 20.0;
244 if (localstatus) {
245 psiconv_warn(lev+1,off,"Reading of size failed");
246 if (length)
247 *length = 0;
248 if (status)
249 *status = localstatus;
250 return 0;
251 }
252 psiconv_debug(lev+1,off,"Size: %f",res);
253 if (status)
254 *status = 0;
255 if (length)
256 *length = 4;
257 return res;
258 }
259
260 int psiconv_parse_bool(const psiconv_buffer buf, int lev, psiconv_u32 off,
261 int *length, psiconv_bool_t *result)
262 {
263 psiconv_u8 temp;
264 int localstatus;
265 temp = psiconv_read_u8(buf,lev,off,&localstatus);
266 if (localstatus) {
267 psiconv_warn(lev+1,off,"Reading of bool failed");
268 if (length)
269 *length = 0;
270 return localstatus;
271 }
272 if (length)
273 *length = 1;
274 if (temp == 0) {
275 *result = psiconv_bool_false;
276 return 0;
277 } else if (temp == 1) {
278 *result = psiconv_bool_true;
279 return 0;
280 }
281 psiconv_warn(lev+1,off,"Unknown value for boolean");
282 psiconv_debug(lev+1,off,"Boolean value: %02x",temp);
283 *result = psiconv_bool_true;
284 return 0;
285 }
286
287 psiconv_string_t psiconv_read_string(const psiconv_buffer buf,int lev,
288 psiconv_u32 off,int *length, int *status)
289 {
290 int stringlen,i,leng,len,localstatus;
291 psiconv_string_t result;
292 char *res_copy;
293
294 psiconv_progress(lev+1,off,"Going to read a string");
295
296 stringlen = psiconv_read_S(buf,lev+2,off,&leng,&localstatus);
297 if (localstatus)
298 goto ERROR1;
299 psiconv_debug(lev+2,off,"Length: %i",stringlen);
300 len = leng;
301
302 result = malloc(stringlen + 1);
303 if (!result)
304 goto ERROR1;
305 for (i = 0; (i < stringlen) && !localstatus; i++)
306 result[i] = psiconv_read_u8(buf,lev,off+i+len,&localstatus);
307 if (localstatus)
308 goto ERROR2;
309 result[stringlen] = 0;
310 len += stringlen;
311
312 res_copy = psiconv_make_printable(result);
313 if (!res_copy)
314 goto ERROR2;
315 psiconv_debug(lev+2,off,"Contents: `%s'",res_copy);
316 free(res_copy);
317
318 if (length)
319 *length = len;
320
321 if (status)
322 *status = 0;
323
324 psiconv_progress(lev+1,off+len-1,"End of string (total length: %08x)",len);
325
326 return result;
327
328 ERROR2:
329 free(result);
330 ERROR1:
331 psiconv_warn(lev+1,off,"Reading of string failed");
332 if (status)
333 *status = localstatus;
334 if (length)
335 *length = 0;
336 return NULL;
337 }
338
339 psiconv_string_t psiconv_read_short_string(const psiconv_buffer buf,
340 int lev,
341 psiconv_u32 off,int *length, int *status)
342 {
343 int stringlen,i,len,localstatus;
344 psiconv_string_t result;
345 char *res_copy;
346
347 psiconv_progress(lev+1,off,"Going to read a short string");
348
349 stringlen = psiconv_read_u8(buf,lev+2,off,&localstatus);
350 if (localstatus)
351 goto ERROR1;
352 psiconv_debug(lev+2,off,"Length: %i",stringlen);
353 len = 1;
354
355 result = malloc(stringlen + 1);
356 if (!result)
357 goto ERROR1;
358 for (i = 0; (i < stringlen) && !localstatus; i++)
359 result[i] = psiconv_read_u8(buf,lev,off+i+len,&localstatus);
360 if (localstatus)
361 goto ERROR2;
362 result[stringlen] = 0;
363 len += stringlen;
364
365 res_copy = psiconv_make_printable(result);
366 if (!res_copy)
367 goto ERROR2;
368 psiconv_debug(lev+2,off,"Contents: `%s'",res_copy);
369 free(res_copy);
370
371 if (length)
372 *length = len;
373
374 if (status)
375 *status = 0;
376
377 psiconv_progress(lev+1,off+len-1,"End of short string (total length: %08x)",
378 len);
379
380 return result;
381
382
383 ERROR2:
384 free(result);
385 ERROR1:
386 psiconv_warn(lev+1,off,"Reading of short string failed");
387 if (status)
388 *status = localstatus;
389 if (length)
390 *length = 0;
391 return NULL;
392 }
393
394 psiconv_float_t psiconv_read_float(const psiconv_buffer buf, int lev,
395 psiconv_u32 off, int *length, int *status)
396 {
397 psiconv_float_t result,bitvalue;
398 int res,bit;
399 psiconv_u32 temp=0;
400
401 psiconv_progress(lev+1,off,"Going to read a float");
402
403 bitvalue = 0.5;
404 result = 1.0;
405 for (bit = 0x33; bit > 0; bit--) {
406 if ((bit == 0x33) || ((bit & 0x07) == 0x07))
407 temp = psiconv_read_u8(buf,lev+2,off+ (bit >> 3),&res);
408 if (res)
409 goto ERROR;
410 if (temp & (0x01 << (bit & 0x07)))
411 result += bitvalue;
412 bitvalue /= 2.0;
413 }
414 temp = psiconv_read_u16(buf,lev+2,off+6,&res);
415 if (res)
416 goto ERROR;
417 if (temp & 0x8000)
418 result = -result;
419 temp = (temp & 0x7ff0) >> 4;
420 result *= pow2(((int) temp)-0x3ff);
421 psiconv_debug(lev+1,off,"Float value: %f",result);
422 if (length)
423 *length = 8;
424 if (*status)
425 *status = res;
426 return result;
427 ERROR:
428 psiconv_warn(lev+1,off,"Reading of float failed");
429 if (length)
430 *length = 0;
431 if (*status)
432 *status = res;
433 return 0.0;
434 }
435

frodo@frodo.looijaard.name
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