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annotate src/common.c @ 79:8f90d5addda9 v2.0

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*: refactor... basically everything! The Win32 GUI version is now unicode-friendly. HOWEVER, ANSI still very much works. you can configure which version to use through `-DUNICODE=0/1` in CFLAGS. the CLI is also friendlier and uses a more sane interface as well. note: the command line flags (which were optional before) are now required. Unicode filenames will not work on Windows because Windows sucks.
author Paper <paper@paper.us.eu.org>
date Wed, 20 Mar 2024 17:06:26 -0400
parents fcd4b9fe957b
children
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79
8f90d5addda9 *: refactor... basically everything!
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1 #include "common.h"
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2
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3 #include <string.h>
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4
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5 /* hardcoded magic values; stored at 0x18... */
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6 static const uint8_t magic_veg[16] = {0xEF, 0x29, 0xC4, 0x46, 0x4A, 0x90, 0xD2, 0x11, 0x87, 0x22, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A};
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7 static const uint8_t magic_vf[16] = {0xF6, 0x1B, 0x3C, 0x53, 0x35, 0xD6, 0xF3, 0x43, 0x8A, 0x90, 0x64, 0xB8, 0x87, 0x23, 0x1F, 0x7F};
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9 int set_file_information(FILE* target, uint8_t version, enum types type) {
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10 const uint8_t* magic = (type == TYPES_VF) ? magic_vf : magic_veg;
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12 if (fseek(target, 0x46, SEEK_SET))
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13 return -1;
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14
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15 if (fputc(version, target) == EOF)
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16 return -1;
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17
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18 if (fseek(target, 0x18, SEEK_SET))
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19 return -1;
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20
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21 if (fwrite(magic, sizeof(*magic), 16, target) < 16)
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22 return -1;
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23
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24 return 0;
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25 }
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27 int get_file_information(FILE* input, uint8_t* version, enum types* type) {
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28 uint8_t magic[16] = {0};
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29
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30 if (fseek(input, 0x46, SEEK_SET))
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31 return -1;
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32
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33 *version = fgetc(input);
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34
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35 if (fseek(input, 0x18, SEEK_SET))
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36 return -1;
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37
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38 /* read the WHOLE magic, then memcmp */
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39 if (fread(magic, sizeof(*magic), ARRAYSIZE(magic), input) < ARRAYSIZE(magic))
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40 return -1;
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41
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42 if (!memcmp(magic, magic_veg, ARRAYSIZE(magic))) {
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43 *type = TYPES_VEG;
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44 } else if (!memcmp(magic, magic_vf, ARRAYSIZE(magic))) {
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45 *type = TYPES_VF;
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46 } else {
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47 *type = TYPES_UNKNOWN;
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48 }
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49
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50 return 0;
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51 }