/[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 132 - (show annotations)
Tue Jul 24 22:44:59 2001 UTC (18 years, 1 month ago) by frodo
File MIME type: text/plain
File size: 11256 byte(s)
(Frodo) Long strings now parsed correctly

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 /* Very inefficient, but good enough for now. By implementing it ourselves,
30 we do not have to link with -lm */
31 psiconv_float_t pow2(int n)
32 {
33 psiconv_float_t res=1.0;
34 int i;
35
36 for (i = 0; i < (n<0?-n:n); i++)
37 res *= 2.0;
38
39 return n<0?1/res:res;
40 }
41 psiconv_u8 psiconv_read_u8(const psiconv_buffer buf,int lev,psiconv_u32 off,
42 int *status)
43 {
44 psiconv_u8 *ptr;
45 ptr = psiconv_buffer_get(buf,off);
46 if (!ptr) {
47 psiconv_warn(lev,off,"Trying byte read past the end of the file");
48 if (status)
49 *status = -PSICONV_E_PARSE;
50 return 0;
51 }
52 if (status)
53 *status = 0;
54 return *ptr;
55 }
56
57 psiconv_u16 psiconv_read_u16(const psiconv_buffer buf,int lev,psiconv_u32 off,
58 int *status)
59 {
60 psiconv_u8 *ptr0,*ptr1;
61 ptr0 = psiconv_buffer_get(buf,off);
62 ptr1 = psiconv_buffer_get(buf,off+1);
63 if (!ptr0 || !ptr1) {
64 psiconv_warn(lev,off,"Trying word read past the end of the file");
65 if (status)
66 *status = -PSICONV_E_PARSE;
67 return 0;
68 }
69 if (status)
70 *status = 0;
71 return *ptr0 + (*ptr1 << 8);
72 }
73
74 psiconv_u32 psiconv_read_u32(const psiconv_buffer buf,int lev,psiconv_u32 off,
75 int *status)
76 {
77 psiconv_u8 *ptr0,*ptr1,*ptr2,*ptr3;
78 ptr0 = psiconv_buffer_get(buf,off);
79 ptr1 = psiconv_buffer_get(buf,off+1);
80 ptr2 = psiconv_buffer_get(buf,off+2);
81 ptr3 = psiconv_buffer_get(buf,off+3);
82 if (!ptr0 || !ptr1 || !ptr2 || !ptr3) {
83 psiconv_warn(lev,off,"Trying long read past the end of the file");
84 if (status)
85 *status = -PSICONV_E_PARSE;
86 return 0;
87 }
88 if (status)
89 *status = 0;
90 return *ptr0 + (*ptr1 << 8) + (*ptr2 << 16) + (*ptr3 << 24);
91 }
92
93 psiconv_s32 psiconv_read_sint(const psiconv_buffer buf,int lev,psiconv_u32 off,
94 int *length,int *status)
95 {
96 int localstatus;
97 psiconv_u32 temp;
98
99 temp=psiconv_read_u32(buf,lev,off,&localstatus);
100 if (status)
101 *status = localstatus;
102 if (length)
103 *length = localstatus?0:4;
104
105 return localstatus?0:(temp & 0x7fffffff)*(temp&0x80000000?-1:1);
106 }
107
108 psiconv_S_t psiconv_read_S(const psiconv_buffer buf, int lev, psiconv_u32 off,
109 int *length,int *status)
110 {
111 psiconv_u8 temp;
112 psiconv_S_t res;
113 int len,localstatus;
114
115 psiconv_progress(lev+1,off,"Going to read a S length indicator");
116 temp = psiconv_read_u8(buf,lev+2,off,&localstatus);
117 if (localstatus)
118 goto ERROR;
119 if ((temp & 0x03) == 0x02) {
120 res = psiconv_read_u8(buf,lev+2,off,&localstatus) >> 2;
121 if (localstatus)
122 goto ERROR;
123 len = 1;
124 psiconv_debug(lev+2,off,"Indicator (1 byte): %02x",res);
125 } else if ((temp & 0x07) == 0x05) {
126 res = psiconv_read_u16(buf,lev+2,off,&localstatus) >> 3;
127 if (localstatus)
128 goto ERROR;
129 len = 2;
130 psiconv_debug(lev+2,off,"Indicator (2 bytes): %04x",res);
131 } else {
132 psiconv_warn(lev+2,off,"S indicator: unknown encoding!");
133 psiconv_debug(lev+2,off,"Raw data first byte: %02x",temp);
134 goto ERROR;
135 }
136
137 if (length)
138 *length = len;
139 if (status)
140 *status = 0;
141
142 psiconv_progress(lev+1,off+len-1,
143 "End of S length indicator (total length: %08x)", len);
144
145 return res;
146
147 ERROR:
148 psiconv_warn(lev+1,off,"Reading of S indicator failed");
149 if (status)
150 *status = localstatus;
151 if (length)
152 *length = 0;
153 return 0;
154 }
155
156 psiconv_X_t psiconv_read_X(const psiconv_buffer buf, int lev, psiconv_u32 off,
157 int *length, int *status)
158 {
159 psiconv_u8 temp;
160 psiconv_X_t res;
161 int len,localstatus;
162
163 psiconv_progress(lev+1,off,"Going to read a X length indicator");
164 temp = psiconv_read_u8(buf,lev+2,off,&localstatus);
165 if (localstatus)
166 goto ERROR;
167 if ((temp & 0x01) == 0x00) {
168 res = psiconv_read_u8(buf,lev+2,off,&localstatus) >> 1;
169 if (localstatus)
170 goto ERROR;
171 len = 1;
172 psiconv_debug(lev+2,off,"Indicator (1 byte): %02x",res);
173 } else if ((temp & 0x03) == 0x01) {
174 res = psiconv_read_u16(buf,lev+2,off,&localstatus) >> 2;
175 if (localstatus)
176 goto ERROR;
177 len = 2;
178 psiconv_debug(lev+2,off,"Indicator (2 bytes): %04x",res);
179 } else if ((temp & 0x07) == 0x03) {
180 res = psiconv_read_u32(buf,lev+2,off,&localstatus) >> 3;
181 if (localstatus)
182 goto ERROR;
183 len = 4;
184 psiconv_debug(lev+2,off,"Indicator (4 bytes): %08x",res);
185 } else {
186 psiconv_warn(lev+2,off,"X indicator: unknown encoding!");
187 psiconv_debug(lev+2,off,"Raw data first byte: %02x",temp);
188 goto ERROR;
189 }
190
191 if (length)
192 *length = len;
193 if (status)
194 *status = 0;
195
196 psiconv_progress(lev+1,off+len-1,
197 "End of X length indicator (total length: %08x)", len);
198
199 return res;
200
201 ERROR:
202 psiconv_warn(lev+1,off,"Reading of X indicator failed");
203 if (status)
204 *status = localstatus;
205 if (length)
206 *length = 0;
207 return 0;
208 }
209
210 psiconv_length_t psiconv_read_length(const psiconv_buffer buf, int lev,
211 psiconv_u32 off, int *length, int *status)
212 {
213 psiconv_length_t res;
214 int localstatus;
215
216 res = (2.54/1440.0) * ((psiconv_s32) psiconv_read_u32(buf,lev,off,
217 &localstatus));
218 if (localstatus) {
219 psiconv_warn(lev+1,off,"Reading of length failed");
220 if (length)
221 *length = 0;
222 if (status)
223 *status = localstatus;
224 return 0;
225 }
226 psiconv_debug(lev+1,off,"Length: %f",res);
227 if (length)
228 *length = 4;
229 if (status)
230 *status = 0;
231 return res;
232 }
233
234 psiconv_size_t psiconv_read_size(const psiconv_buffer buf, int lev,
235 psiconv_u32 off, int *length, int *status)
236 {
237 psiconv_size_t res;
238 int localstatus;
239 res = ((psiconv_s32) psiconv_read_u32(buf,lev,off,&localstatus)) / 20.0;
240 if (localstatus) {
241 psiconv_warn(lev+1,off,"Reading of size failed");
242 if (length)
243 *length = 0;
244 if (status)
245 *status = localstatus;
246 return 0;
247 }
248 psiconv_debug(lev+1,off,"Size: %f",res);
249 if (status)
250 *status = 0;
251 if (length)
252 *length = 4;
253 return res;
254 }
255
256 int psiconv_parse_bool(const psiconv_buffer buf, int lev, psiconv_u32 off,
257 int *length, psiconv_bool_t *result)
258 {
259 psiconv_u8 temp;
260 int localstatus;
261 temp = psiconv_read_u8(buf,lev,off,&localstatus);
262 if (localstatus) {
263 psiconv_warn(lev+1,off,"Reading of bool failed");
264 if (length)
265 *length = 0;
266 return localstatus;
267 }
268 if (length)
269 *length = 1;
270 if (temp == 0) {
271 *result = psiconv_bool_false;
272 return 0;
273 } else if (temp == 1) {
274 *result = psiconv_bool_true;
275 return 0;
276 }
277 psiconv_warn(lev+1,off,"Unknown value for boolean");
278 psiconv_debug(lev+1,off,"Boolean value: %02x",temp);
279 *result = psiconv_bool_true;
280 return 0;
281 }
282
283 psiconv_string_t psiconv_read_string(const psiconv_buffer buf,int lev,
284 psiconv_u32 off,int *length, int *status)
285 {
286 int stringlen,i,leng,len,localstatus;
287 psiconv_string_t result;
288 char *res_copy;
289
290 psiconv_progress(lev+1,off,"Going to read a string");
291
292 stringlen = psiconv_read_S(buf,lev+2,off,&leng,&localstatus);
293 if (localstatus)
294 goto ERROR1;
295 psiconv_debug(lev+2,off,"Length: %i",stringlen);
296 len = leng;
297
298 result = malloc(stringlen + 1);
299 if (!result)
300 goto ERROR1;
301 for (i = 0; (i < stringlen) && !localstatus; i++)
302 result[i] = psiconv_read_u8(buf,lev,off+i+len,&localstatus);
303 if (localstatus)
304 goto ERROR2;
305 result[stringlen] = 0;
306 len += stringlen;
307
308 res_copy = psiconv_make_printable(result);
309 if (!res_copy)
310 goto ERROR2;
311 psiconv_debug(lev+2,off,"Contents: `%s'",res_copy);
312 free(res_copy);
313
314 if (length)
315 *length = len;
316
317 if (status)
318 *status = 0;
319
320 psiconv_progress(lev+1,off+len-1,"End of string (total length: %08x)",len);
321
322 return result;
323
324 ERROR2:
325 free(result);
326 ERROR1:
327 psiconv_warn(lev+1,off,"Reading of string failed");
328 if (status)
329 *status = localstatus;
330 if (length)
331 *length = 0;
332 return NULL;
333 }
334
335 psiconv_string_t psiconv_read_short_string(const psiconv_buffer buf,
336 int lev,
337 psiconv_u32 off,int *length, int *status)
338 {
339 int stringlen,i,len,localstatus;
340 psiconv_string_t result;
341 char *res_copy;
342
343 psiconv_progress(lev+1,off,"Going to read a short string");
344
345 stringlen = psiconv_read_u8(buf,lev+2,off,&localstatus);
346 if (localstatus)
347 goto ERROR1;
348 psiconv_debug(lev+2,off,"Length: %i",stringlen);
349 len = 1;
350
351 result = malloc(stringlen + 1);
352 if (!result)
353 goto ERROR1;
354 for (i = 0; (i < stringlen) && !localstatus; i++)
355 result[i] = psiconv_read_u8(buf,lev,off+i+len,&localstatus);
356 if (localstatus)
357 goto ERROR2;
358 result[stringlen] = 0;
359 len += stringlen;
360
361 res_copy = psiconv_make_printable(result);
362 if (!res_copy)
363 goto ERROR2;
364 psiconv_debug(lev+2,off,"Contents: `%s'",res_copy);
365 free(res_copy);
366
367 if (length)
368 *length = len;
369
370 if (status)
371 *status = 0;
372
373 psiconv_progress(lev+1,off+len-1,"End of short string (total length: %08x)",
374 len);
375
376 return result;
377
378
379 ERROR2:
380 free(result);
381 ERROR1:
382 psiconv_warn(lev+1,off,"Reading of short string failed");
383 if (status)
384 *status = localstatus;
385 if (length)
386 *length = 0;
387 return NULL;
388 }
389
390 psiconv_float_t psiconv_read_float(const psiconv_buffer buf, int lev,
391 psiconv_u32 off, int *length, int *status)
392 {
393 psiconv_float_t result,bitvalue;
394 int res,bit;
395 psiconv_u32 temp=0;
396
397 psiconv_progress(lev+1,off,"Going to read a float");
398
399 bitvalue = 0.5;
400 result = 1.0;
401 for (bit = 0x33; bit > 0; bit--) {
402 if ((bit == 0x33) || ((bit & 0x07) == 0x07))
403 temp = psiconv_read_u8(buf,lev+2,off+ (bit >> 3),&res);
404 if (res)
405 goto ERROR;
406 if (temp & (0x01 << (bit & 0x07)))
407 result += bitvalue;
408 bitvalue /= 2.0;
409 }
410 temp = psiconv_read_u16(buf,lev+2,off+6,&res);
411 if (res)
412 goto ERROR;
413 if (temp & 0x8000)
414 result = -result;
415 temp = (temp & 0x7ff0) >> 4;
416 result *= pow2(((int) temp)-0x3ff);
417 psiconv_debug(lev+1,off,"Float value: %f",result);
418 if (length)
419 *length = 8;
420 if (*status)
421 *status = res;
422 return result;
423 ERROR:
424 psiconv_warn(lev+1,off,"Reading of float failed");
425 if (length)
426 *length = 0;
427 if (*status)
428 *status = res;
429 return 0.0;
430 }
431

frodo@frodo.looijaard.name
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