FreeCalypso > hg > freecalypso-tools
annotate target-utils/libtiffs/init.c @ 820:03457a66d860
buzplayer: add basic support for PWT
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 30 May 2021 03:39:58 +0000 |
parents | c10a65f7563e |
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rev | line source |
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1 #include "types.h" |
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2 #include "struct.h" |
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3 #include "globals.h" |
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4 #include "macros.h" |
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5 |
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6 static const u8 ffs_sector_signature[6] = {'F', 'f', 's', '#', 0x10, 0x02}; |
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7 |
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8 static |
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9 find_indexblk() |
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10 { |
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11 u32 sector_addr; |
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12 u8 *sector_ptr; |
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13 int i; |
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14 |
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15 printf("Looking for TIFFS active index block\n"); |
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16 sector_addr = tiffs_base_addr; |
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17 for (i = 0; i < tiffs_nsectors; i++) { |
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18 sector_ptr = (u8 *) sector_addr; |
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19 if (!bcmp(sector_ptr, ffs_sector_signature, 6) && |
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20 sector_ptr[8] == 0xAB) { |
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21 printf("Found at %08X\n", sector_addr); |
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22 tiffs_active_index = (struct inode *) sector_ptr; |
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23 return(0); |
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24 } |
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25 sector_addr += tiffs_sector_size; |
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26 } |
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27 printf("Error: Not found in any of the %d candidate sectors\n", |
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28 tiffs_nsectors); |
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29 return(-1); |
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30 } |
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31 |
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32 static |
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33 find_rootino() |
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34 { |
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35 int ino; |
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36 struct inode *irec; |
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37 |
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38 printf("Looking for the root inode\n"); |
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39 for (ino = 1; ; ino++) { |
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40 if (ino >= tiffs_sector_size >> 4) { |
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41 printf("Error: Hit end of sector, no root inode found\n"); |
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42 return(-1); |
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43 } |
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44 irec = tiffs_active_index + ino; |
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45 if (irec->type == OBJTYPE_DIR && *inode_to_dataptr(irec) == '/') |
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46 break; |
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47 } |
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48 printf("Found at inode #%x\n", ino); |
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49 tiffs_root_ino = ino; |
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50 return(0); |
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51 } |
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52 |
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53 tiffs_init() |
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54 { |
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55 int stat; |
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56 |
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57 if (tiffs_init_done) |
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58 return(0); |
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59 stat = find_indexblk(); |
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60 if (stat < 0) |
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61 return(stat); |
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62 stat = find_rootino(); |
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63 if (stat < 0) |
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64 return(stat); |
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65 tiffs_init_done = 1; |
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66 return(0); |
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67 } |