mirror of https://github.com/PCSX2/pcsx2.git
107 lines
3.0 KiB
C
107 lines
3.0 KiB
C
/***************************************************************
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* romdir.c, based over Alex Lau (http://alexlau.8k.com) RomDir *
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****************************************************************/
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#include "romdir.h"
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// searches between beginning and end addresses for a romdir structure.
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// if found it returns info about it in romDirInfo.
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//
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// args: address to start searching from
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// address to stop searching at
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// gets filled in with info if found
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// returns: a pointer to the filled in romDirInfo if successful
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// NULL if error
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ROMDIR_INFO* searchRomDir(const u32* searchStartAddr, const u32* searchEndAddr, ROMDIR_INFO* romDirInfo)
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{
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int offset = 0;
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ROMDIR_ENTRY* dir_entry = (ROMDIR_ENTRY*)searchStartAddr;
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while (dir_entry < (ROMDIR_ENTRY*)searchEndAddr)
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{
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if(dir_entry->name[0] == 'R' &&
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dir_entry->name[1] == 'E' &&
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dir_entry->name[2] == 'S' &&
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dir_entry->name[3] == 'E' &&
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dir_entry->name[4] == 'T' &&
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dir_entry->name[5] == 0 &&
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(ROUND_UP(dir_entry->fileSize,16) == offset) )
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{
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romDirInfo->romPtr = (u32)searchStartAddr; // start of rom
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romDirInfo->romdirPtr = dir_entry; // start of romdir structure
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romDirInfo->extinfoPtr = (u32)dir_entry + dir_entry[1].fileSize; // start of extinfo
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return romDirInfo;
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}
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dir_entry++;
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offset += sizeof(ROMDIR_ENTRY);
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}
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// not found
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romDirInfo->romdirPtr = NULL;
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return NULL;
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}
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// find a file in the romdir table and return info about it
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//
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// args: info about romdir to search through
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// filename to search for
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// structure to get info about file into
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// returns: a pointer to fileinfo if successful
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// NULL otherwise
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ROMFILE_INFO* searchFileInRom(const ROMDIR_INFO* romdirInfo, const char* filename, ROMFILE_INFO* fileinfo)
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{
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register ROMDIR_ENTRY* dir_entry;
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register ext_offset=0, file_offset=0;
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int i;
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for (dir_entry = romdirInfo->romdirPtr; dir_entry->name[0]; dir_entry++) {
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for(i = 0; i < 10; ++i) {
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if( filename[i] == 0 )
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break;
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if( dir_entry->name[i] != filename[i] ) {
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i = -1;
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break;
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}
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}
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if (i > 0 ) {
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fileinfo->entry = dir_entry;
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fileinfo->fileData = file_offset + romdirInfo->romPtr; // address of file in rom
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fileinfo->extData = (u32)NULL; // address of extinfo in rom
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if (dir_entry->extSize)
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fileinfo->extData = ext_offset + romdirInfo->extinfoPtr; // address of extinfo in rom
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return fileinfo;
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}
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file_offset += ROUND_UP(dir_entry->fileSize,16);
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ext_offset += dir_entry->extSize;
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}
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// error - file not found
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return NULL;
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}
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// gets a hex number from *addr and updates the pointer
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//
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// args: pointer to string buffer containing a hex number
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// returns: the value of the hex number
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u32 getHexNumber(char** addr)
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{
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register char *p; //a1
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register u32 h = 0; //a2;
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for (p=*addr; *p >= '0'; p++)
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{
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int num;
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if(*p <= '9') num = *p - '0';
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else if(*p >= 'a') num = *p - 'a' + 10;
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else num = *p - 'A' + 10;
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h = h*16 + num;
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}
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*addr = p;
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return h;
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}
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