1 /*****************************************************************************/
5 /* File I/O for the od65 object file dump utility */
9 /* (C) 1998-2000 Ullrich von Bassewitz */
11 /* D-70597 Stuttgart */
12 /* EMail: uz@musoftware.de */
15 /* This software is provided 'as-is', without any expressed or implied */
16 /* warranty. In no event will the authors be held liable for any damages */
17 /* arising from the use of this software. */
19 /* Permission is granted to anyone to use this software for any purpose, */
20 /* including commercial applications, and to alter it and redistribute it */
21 /* freely, subject to the following restrictions: */
23 /* 1. The origin of this software must not be misrepresented; you must not */
24 /* claim that you wrote the original software. If you use this software */
25 /* in a product, an acknowledgment in the product documentation would be */
26 /* appreciated but is not required. */
27 /* 2. Altered source versions must be plainly marked as such, and must not */
28 /* be misrepresented as being the original software. */
29 /* 3. This notice may not be removed or altered from any source */
32 /*****************************************************************************/
48 /*****************************************************************************/
50 /*****************************************************************************/
54 void FileSeek (FILE* F, unsigned long Pos)
55 /* Seek to the given absolute position, fail on errors */
57 if (fseek (F, Pos, SEEK_SET) != 0) {
58 Error ("Cannot seek: %s", strerror (errno));
64 unsigned Read8 (FILE* F)
65 /* Read an 8 bit value from the file */
69 Error ("Read error (file corrupt?)");
76 unsigned Read16 (FILE* F)
77 /* Read a 16 bit value from the file */
79 unsigned Lo = Read8 (F);
80 unsigned Hi = Read8 (F);
81 return (Hi << 8) | Lo;
86 unsigned long Read24 (FILE* F)
87 /* Read a 24 bit value from the file */
89 unsigned long Lo = Read16 (F);
90 unsigned long Hi = Read8 (F);
91 return (Hi << 16) | Lo;
96 unsigned long Read32 (FILE* F)
97 /* Read a 32 bit value from the file */
99 unsigned long Lo = Read16 (F);
100 unsigned long Hi = Read16 (F);
101 return (Hi << 16) | Lo;
106 long Read32Signed (FILE* F)
107 /* Read a 32 bit value from the file. Sign extend the value. */
109 /* Read a 32 bit value */
110 unsigned long V = Read32 (F);
112 /* Sign extend the value */
113 if (V & 0x80000000UL) {
118 /* Return it as a long */
124 unsigned long ReadVar (FILE* F)
125 /* Read a variable size value from the file */
127 /* The value was written to the file in 7 bit chunks LSB first. If there
128 * are more bytes, bit 8 is set, otherwise it is clear.
136 /* Encode it into the target value */
137 V |= ((unsigned long)(C & 0x7F)) << Shift;
142 /* Return the value read */
148 char* ReadStr (FILE* F)
149 /* Read a string from the file into a malloced area */
151 /* Read the length */
152 unsigned Len = ReadVar (F);
154 /* Allocate memory */
155 char* Str = xmalloc (Len + 1);
157 /* Read the string itself */
158 ReadData (F, Str, Len);
160 /* Terminate the string and return it */
167 FilePos* ReadFilePos (FILE* F, FilePos* Pos)
168 /* Read a file position from the file */
170 /* Read the data fields */
171 Pos->Line = ReadVar (F);
172 Pos->Col = ReadVar (F);
173 Pos->Name = ReadVar (F);
179 void* ReadData (FILE* F, void* Data, unsigned Size)
180 /* Read data from the file */
182 /* Accept zero sized reads */
184 if (fread (Data, 1, Size, F) != Size) {
185 Error ("Read error (file corrupt?)");
193 void ReadObjHeader (FILE* F, ObjHeader* H)
194 /* Read an object file header from the file */
196 /* Read all fields */
197 H->Magic = Read32 (F);
198 H->Version = Read16 (F);
199 H->Flags = Read16 (F);
200 H->OptionOffs = Read32 (F);
201 H->OptionSize = Read32 (F);
202 H->FileOffs = Read32 (F);
203 H->FileSize = Read32 (F);
204 H->SegOffs = Read32 (F);
205 H->SegSize = Read32 (F);
206 H->ImportOffs = Read32 (F);
207 H->ImportSize = Read32 (F);
208 H->ExportOffs = Read32 (F);
209 H->ExportSize = Read32 (F);
210 H->DbgSymOffs = Read32 (F);
211 H->DbgSymSize = Read32 (F);
212 H->LineInfoOffs = Read32 (F);
213 H->LineInfoSize = Read32 (F);