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Annotation of /psiconv/trunk/lib/psiconv/parse_simple.c

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Revision 64 - (hide annotations)
Fri Dec 15 00:21:51 2000 UTC (19 years, 7 months ago) by frodo
File MIME type: text/plain
File size: 8203 byte(s)
(Frodo) Massive update: theoretically, all return codes are now checked.
        Untested - may have many typos.

1 frodo 2 /*
2     parse_simple.c - Part of psiconv, a PSION 5 file formats converter
3 frodo 63 Copyright (c) 1999, 2000 Frodo Looijaard <frodol@dds.nl>
4 frodo 2
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 <stdlib.h>
22    
23     #include "parse_routines.h"
24    
25 frodo 64 psiconv_u8 psiconv_read_u8(const psiconv_buffer buf,int lev,psiconv_u32 off,
26     int *status)
27 frodo 2 {
28     psiconv_u8 *ptr;
29     ptr = psiconv_list_get(buf,off);
30 frodo 64 if (!ptr) {
31     psiconv_warn(lev,off,"Trying byte read past the end of the file");
32     if (status)
33     *status = -PSICONV_E_PARSE;
34     return 0;
35     }
36     if (status)
37     *status = 0;
38 frodo 2 return *ptr;
39     }
40    
41 frodo 64 psiconv_u16 psiconv_read_u16(const psiconv_buffer buf,int lev,psiconv_u32 off,
42     int *status)
43 frodo 2 {
44     psiconv_u8 *ptr0,*ptr1;
45     ptr0 = psiconv_list_get(buf,off);
46     ptr1 = psiconv_list_get(buf,off+1);
47 frodo 64 if (!ptr0 || !ptr1) {
48     psiconv_warn(lev,off,"Trying word read past the end of the file");
49     if (status)
50     *status = -PSICONV_E_PARSE;
51     return 0;
52     }
53     if (status)
54     *status = 0;
55 frodo 2 return *ptr0 + (*ptr1 << 8);
56     }
57    
58 frodo 64 psiconv_u32 psiconv_read_u32(const psiconv_buffer buf,int lev,psiconv_u32 off,
59     int *status)
60 frodo 2 {
61     psiconv_u8 *ptr0,*ptr1,*ptr2,*ptr3;
62     ptr0 = psiconv_list_get(buf,off);
63     ptr1 = psiconv_list_get(buf,off+1);
64     ptr2 = psiconv_list_get(buf,off+2);
65     ptr3 = psiconv_list_get(buf,off+3);
66 frodo 64 if (!ptr0 || !ptr1 || !ptr2 || !ptr3) {
67     psiconv_warn(lev,off,"Trying long read past the end of the file");
68     if (status)
69     *status = -PSICONV_E_PARSE;
70     return 0;
71     }
72     if (status)
73     *status = 0;
74 frodo 2 return *ptr0 + (*ptr1 << 8) + (*ptr2 << 16) + (*ptr3 << 24);
75     }
76    
77     psiconv_S_t psiconv_read_S(const psiconv_buffer buf, int lev, psiconv_u32 off,
78 frodo 64 int *length,int *status)
79 frodo 2 {
80     psiconv_u8 temp;
81     psiconv_S_t res;
82 frodo 64 int len,localstatus;
83 frodo 2
84     psiconv_progress(lev+1,off,"Going to read a S length indicator");
85 frodo 64 temp = psiconv_read_u8(buf,lev+2,off,&localstatus);
86     if (localstatus)
87     goto ERROR;
88 frodo 2 if ((temp & 0x03) == 0x02) {
89 frodo 64 res = psiconv_read_u8(buf,lev+2,off,&localstatus) >> 2;
90     if (localstatus)
91     goto ERROR;
92 frodo 2 len = 1;
93     psiconv_debug(lev+2,off,"Indicator (1 byte): %02x",res);
94     } else if ((temp & 0x07) == 0x03) {
95 frodo 64 res = psiconv_read_u16(buf,lev+2,off,&localstatus) >> 3;
96     if (localstatus)
97     goto ERROR;
98 frodo 2 len = 2;
99     psiconv_debug(lev+2,off,"Indicator (2 bytes): %04x",res);
100     } else {
101     psiconv_warn(lev+2,off,"S indicator: unknown encoding!");
102     psiconv_debug(lev+2,off,"Raw data first byte: %02x",temp);
103 frodo 64 goto ERROR;
104 frodo 2 }
105    
106     if (length)
107     *length = len;
108 frodo 64 if (status)
109     *status = 0;
110 frodo 2
111     psiconv_progress(lev+1,off+len-1,
112     "End of S length indicator (total length: %08x)", len);
113    
114     return res;
115 frodo 64
116     ERROR:
117     psiconv_warn(lev+1,off,"Reading of S indicator failed");
118     if (status)
119     *status = localstatus;
120     if (length)
121     *length = 0;
122     return 0;
123 frodo 2 }
124    
125     psiconv_X_t psiconv_read_X(const psiconv_buffer buf, int lev, psiconv_u32 off,
126 frodo 64 int *length, int *status)
127 frodo 2 {
128     psiconv_u8 temp;
129     psiconv_X_t res;
130 frodo 64 int len,localstatus;
131 frodo 2
132     psiconv_progress(lev+1,off,"Going to read a X length indicator");
133 frodo 64 temp = psiconv_read_u8(buf,lev+2,off,&localstatus);
134     if (localstatus)
135     goto ERROR;
136 frodo 2 if ((temp & 0x01) == 0x00) {
137 frodo 64 res = psiconv_read_u8(buf,lev+2,off,&localstatus) >> 1;
138     if (localstatus)
139     goto ERROR;
140 frodo 2 len = 1;
141     psiconv_debug(lev+2,off,"Indicator (1 byte): %02x",res);
142     } else if ((temp & 0x03) == 0x01) {
143 frodo 64 res = psiconv_read_u16(buf,lev+2,off,&localstatus) >> 2;
144     if (localstatus)
145     goto ERROR;
146 frodo 2 len = 2;
147     psiconv_debug(lev+2,off,"Indicator (2 bytes): %04x",res);
148     } else if ((temp & 0x07) == 0x03) {
149 frodo 64 res = psiconv_read_u32(buf,lev+2,off,&localstatus) >> 3;
150     if (localstatus)
151     goto ERROR;
152 frodo 2 len = 4;
153     psiconv_debug(lev+2,off,"Indicator (4 bytes): %08x",res);
154     } else {
155     psiconv_warn(lev+2,off,"X indicator: unknown encoding!");
156     psiconv_debug(lev+2,off,"Raw data first byte: %02x",temp);
157 frodo 64 goto ERROR;
158 frodo 2 }
159    
160     if (length)
161     *length = len;
162 frodo 64 if (status)
163     *status = 0;
164 frodo 2
165     psiconv_progress(lev+1,off+len-1,
166     "End of X length indicator (total length: %08x)", len);
167    
168     return res;
169 frodo 64
170     ERROR:
171     psiconv_warn(lev+1,off,"Reading of X indicator failed");
172     if (status)
173     *status = localstatus;
174     if (length)
175     *length = 0;
176     return 0;
177 frodo 2 }
178    
179     psiconv_length_t psiconv_read_length(const psiconv_buffer buf, int lev,
180 frodo 64 psiconv_u32 off, int *length, int *status)
181 frodo 2 {
182     psiconv_length_t res;
183 frodo 64 int localstatus;
184    
185     res = (2.54/1440.0) * ((psiconv_s32) psiconv_read_u32(buf,lev,off,
186     &localstatus));
187     if (localstatus) {
188     psiconv_warn(lev+1,off,"Reading of length failed");
189     if (length)
190     *length = 0;
191     if (status)
192     *status = localstatus;
193     return 0;
194     }
195 frodo 2 psiconv_debug(lev+1,off,"Length: %f",res);
196     if (length)
197     *length = 4;
198 frodo 64 if (status)
199     *status = 0;
200 frodo 2 return res;
201     }
202    
203     psiconv_size_t psiconv_read_size(const psiconv_buffer buf, int lev,
204 frodo 64 psiconv_u32 off, int *length, int *status)
205 frodo 2 {
206     psiconv_size_t res;
207 frodo 64 int localstatus;
208     res = ((psiconv_s32) psiconv_read_u32(buf,lev,off,&localstatus)) / 20.0;
209     if (localstatus) {
210     psiconv_warn(lev+1,off,"Reading of size failed");
211     if (length)
212     *length = 0;
213     if (status)
214     *status = localstatus;
215     return 0;
216     }
217 frodo 2 psiconv_debug(lev+1,off,"Size: %f",res);
218 frodo 64 if (status)
219     *status = 0;
220 frodo 2 if (length)
221     *length = 4;
222     return res;
223     }
224    
225     int psiconv_parse_bool(const psiconv_buffer buf, int lev, psiconv_u32 off,
226     int *length, psiconv_bool_t *result)
227     {
228     psiconv_u8 temp;
229 frodo 64 int localstatus;
230     temp = psiconv_read_u8(buf,lev,off,&localstatus);
231     if (localstatus) {
232     psiconv_warn(lev+1,off,"Reading of bool failed");
233     if (length)
234     *length = 0;
235     return localstatus;
236     }
237 frodo 2 if (length)
238     *length = 1;
239     if (temp == 0) {
240     *result = psiconv_bool_false;
241     return 0;
242     } else if (temp == 1) {
243     *result = psiconv_bool_true;
244     return 0;
245     }
246     psiconv_warn(lev+1,off,"Unknown value for boolean");
247     psiconv_debug(lev+1,off,"Boolean value: %02x",temp);
248     *result = psiconv_bool_true;
249 frodo 64 return 0;
250 frodo 2 }
251    
252     psiconv_string_t psiconv_read_string(const psiconv_buffer buf,int lev,
253 frodo 64 psiconv_u32 off,int *length, int *status)
254 frodo 2 {
255 frodo 64 int stringlen,i,leng,len,localstatus;
256 frodo 2 psiconv_string_t result;
257     char *res_copy;
258    
259     psiconv_progress(lev+1,off,"Going to read a string");
260    
261 frodo 64 stringlen = psiconv_read_S(buf,lev+2,off,&leng,&localstatus);
262     if (localstatus)
263     goto ERROR1;
264 frodo 2 psiconv_debug(lev+2,off,"Length: %i",stringlen);
265     len = leng;
266    
267     result = malloc(stringlen + 1);
268 frodo 64 if (!result)
269     goto ERROR1;
270     for (i = 0; (i < stringlen) && !localstatus; i++)
271     result[i] = psiconv_read_u8(buf,lev,off+i+len,&localstatus);
272     if (localstatus)
273     goto ERROR2;
274 frodo 2 result[stringlen] = 0;
275     len += stringlen;
276    
277     res_copy = psiconv_make_printable(result);
278 frodo 64 if (!res_copy)
279     goto ERROR2;
280 frodo 2 psiconv_debug(lev+2,off,"Contents: `%s'",res_copy);
281     free(res_copy);
282    
283     if (length)
284     *length = len;
285    
286 frodo 64 if (status)
287     *status = 0;
288    
289 frodo 2 psiconv_progress(lev+1,off+len-1,"End of string (total length: %08x)",len);
290    
291     return result;
292 frodo 64
293     ERROR2:
294     free(result);
295     ERROR1:
296     psiconv_warn(lev+1,off,"Reading of string failed");
297     if (status)
298     *status = localstatus;
299     if (length)
300     *length = 0;
301     return NULL;
302 frodo 2 }

frodo@frodo.looijaard.name
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