/[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 2 - (show annotations)
Sun Oct 3 21:10:47 1999 UTC (20 years, 11 months ago) by frodo
File MIME type: text/plain
File size: 5867 byte(s)
Imported sources

1 /*
2 parse_simple.c - Part of psiconv, a PSION 5 file formats converter
3 Copyright (c) 1999 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 <stdlib.h>
22
23 #include "parse_routines.h"
24
25 psiconv_u8 psiconv_read_u8(const psiconv_buffer buf,int lev,psiconv_u32 off)
26 {
27 psiconv_u8 *ptr;
28 ptr = psiconv_list_get(buf,off);
29 if (!ptr)
30 psiconv_fatal(lev,off,"Trying byte read past the end of the file");
31 return *ptr;
32 }
33
34 psiconv_u16 psiconv_read_u16(const psiconv_buffer buf,int lev,psiconv_u32 off)
35 {
36 psiconv_u8 *ptr0,*ptr1;
37 ptr0 = psiconv_list_get(buf,off);
38 ptr1 = psiconv_list_get(buf,off+1);
39 if (!ptr0 || !ptr1)
40 psiconv_fatal(lev,off,"Trying word read past the end of the file");
41 return *ptr0 + (*ptr1 << 8);
42 }
43
44 psiconv_u32 psiconv_read_u32(const psiconv_buffer buf,int lev,psiconv_u32 off)
45 {
46 psiconv_u8 *ptr0,*ptr1,*ptr2,*ptr3;
47 ptr0 = psiconv_list_get(buf,off);
48 ptr1 = psiconv_list_get(buf,off+1);
49 ptr2 = psiconv_list_get(buf,off+2);
50 ptr3 = psiconv_list_get(buf,off+3);
51 if (!ptr0 || !ptr1 || !ptr2 || !ptr3)
52 psiconv_fatal(lev,off,"Trying long read past the end of the file");
53 return *ptr0 + (*ptr1 << 8) + (*ptr2 << 16) + (*ptr3 << 24);
54 }
55
56 psiconv_S_t psiconv_read_S(const psiconv_buffer buf, int lev, psiconv_u32 off,
57 int *length)
58 {
59 psiconv_u8 temp;
60 psiconv_S_t res;
61 int len;
62
63 psiconv_progress(lev+1,off,"Going to read a S length indicator");
64 temp = psiconv_read_u8(buf,lev+2,off);
65 if ((temp & 0x03) == 0x02) {
66 res = psiconv_read_u8(buf,lev+2,off) >> 2;
67 len = 1;
68 psiconv_debug(lev+2,off,"Indicator (1 byte): %02x",res);
69 } else if ((temp & 0x07) == 0x03) {
70 res = psiconv_read_u16(buf,lev+2,off) >> 3;
71 len = 2;
72 psiconv_debug(lev+2,off,"Indicator (2 bytes): %04x",res);
73 } else {
74 psiconv_warn(lev+2,off,"S indicator: unknown encoding!");
75 psiconv_debug(lev+2,off,"Raw data first byte: %02x",temp);
76 res = 0;
77 len = 1;
78 }
79
80 if (length)
81 *length = len;
82
83 psiconv_progress(lev+1,off+len-1,
84 "End of S length indicator (total length: %08x)", len);
85
86 return res;
87 }
88
89 psiconv_X_t psiconv_read_X(const psiconv_buffer buf, int lev, psiconv_u32 off,
90 int *length)
91 {
92 psiconv_u8 temp;
93 psiconv_X_t res;
94 int len;
95
96 psiconv_progress(lev+1,off,"Going to read a X length indicator");
97 temp = psiconv_read_u8(buf,lev+2,off);
98 if ((temp & 0x01) == 0x00) {
99 res = psiconv_read_u8(buf,lev+2,off) >> 1;
100 len = 1;
101 psiconv_debug(lev+2,off,"Indicator (1 byte): %02x",res);
102 } else if ((temp & 0x03) == 0x01) {
103 res = psiconv_read_u16(buf,lev+2,off) >> 2;
104 len = 2;
105 psiconv_debug(lev+2,off,"Indicator (2 bytes): %04x",res);
106 } else if ((temp & 0x07) == 0x03) {
107 res = psiconv_read_u16(buf,lev+2,off) >> 3;
108 len = 4;
109 psiconv_debug(lev+2,off,"Indicator (4 bytes): %08x",res);
110 } else {
111 psiconv_warn(lev+2,off,"X indicator: unknown encoding!");
112 psiconv_debug(lev+2,off,"Raw data first byte: %02x",temp);
113 res = 0;
114 len = 1;
115 }
116
117 if (length)
118 *length = len;
119
120 psiconv_progress(lev+1,off+len-1,
121 "End of X length indicator (total length: %08x)", len);
122
123 return res;
124 }
125
126 psiconv_length_t psiconv_read_length(const psiconv_buffer buf, int lev,
127 psiconv_u32 off, int *length)
128 {
129 psiconv_length_t res;
130 res = (2.54/1440.0) * ((psiconv_s32) psiconv_read_u32(buf,lev,off));
131 psiconv_debug(lev+1,off,"Length: %f",res);
132 if (length)
133 *length = 4;
134 return res;
135 }
136
137 psiconv_size_t psiconv_read_size(const psiconv_buffer buf, int lev,
138 psiconv_u32 off, int *length)
139 {
140 psiconv_size_t res;
141 res = ((psiconv_s32) psiconv_read_u32(buf,lev,off)) / 20.0;
142 psiconv_debug(lev+1,off,"Size: %f",res);
143 if (length)
144 *length = 4;
145 return res;
146 }
147
148 int psiconv_parse_bool(const psiconv_buffer buf, int lev, psiconv_u32 off,
149 int *length, psiconv_bool_t *result)
150 {
151 psiconv_u8 temp;
152 temp = psiconv_read_u8(buf,lev,off);
153 if (length)
154 *length = 1;
155 if (temp == 0) {
156 *result = psiconv_bool_false;
157 return 0;
158 } else if (temp == 1) {
159 *result = psiconv_bool_true;
160 return 0;
161 }
162 psiconv_warn(lev+1,off,"Unknown value for boolean");
163 psiconv_debug(lev+1,off,"Boolean value: %02x",temp);
164 *result = psiconv_bool_true;
165 return -1;
166 }
167
168 psiconv_string_t psiconv_read_string(const psiconv_buffer buf,int lev,
169 psiconv_u32 off,int *length)
170 {
171 int stringlen,i,leng,len;
172 psiconv_string_t result;
173 char *res_copy;
174
175 psiconv_progress(lev+1,off,"Going to read a string");
176
177 stringlen = psiconv_read_S(buf,lev+2,off,&leng);
178 psiconv_debug(lev+2,off,"Length: %i",stringlen);
179 len = leng;
180
181 result = malloc(stringlen + 1);
182 for (i = 0; i < stringlen; i++)
183 result[i] = psiconv_read_u8(buf,lev,off+i+len);
184 result[stringlen] = 0;
185 len += stringlen;
186
187 res_copy = psiconv_make_printable(result);
188 psiconv_debug(lev+2,off,"Contents: `%s'",res_copy);
189 free(res_copy);
190
191 if (length)
192 *length = len;
193
194 psiconv_progress(lev+1,off+len-1,"End of string (total length: %08x)",len);
195
196 return result;
197 }

frodo@frodo.looijaard.name
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