mirror of
https://github.com/ApacheThunder/NTR_Launcher.git
synced 2025-06-19 03:25:38 -04:00
33b091861b
Overhaul of old cart loading code courtasy of Robz8. There is however a small regression. This build currently can't boot DS-Xtreme. If you have issues with flashcarts not booting games/homebrew correctly, disable the extended ram option in the ini file. Currently off by default. But it must be on for TWL carts to boot correctly.
118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
//#include <string.h> // memcmp
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#include <stddef.h> // NULL
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#include <nds/ndstypes.h>
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//#include <limits.h>
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#include "find.h"
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// (memcmp is slower)
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//#define memcmp __builtin_memcmp
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//#define TABLE_SIZE (UCHAR_MAX + 1) // 256
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extern inline u32* findOffset(const u32* start, u32 dataLen, const u32* find, u32 findLen);
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extern inline u32* findOffsetBackwards(const u32* start, u32 dataLen, const u32* find, u32 findLen);
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extern inline u16* findOffsetThumb(const u16* start, u32 dataLen, const u16* find, u32 findLen);
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extern inline u16* findOffsetBackwardsThumb(const u16* start, u32 dataLen, const u16* find, u32 findLen);
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/*
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* Look for @find and return the position of it.
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* Brute Force algorithm
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*/
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u32* memsearch32(const u32* start, u32 dataSize, const u32* find, u32 findSize, bool forward) {
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u32 dataLen = dataSize/sizeof(u32);
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u32 findLen = findSize/sizeof(u32);
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const u32* end = forward ? (start + dataLen) : (start - dataLen);
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for (u32* addr = (u32*)start; addr != end; forward ? ++addr : --addr) {
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bool found = true;
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for (u32 j = 0; j < findLen; ++j) {
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if (addr[j] != find[j]) {
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found = false;
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break;
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}
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}
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if (found) {
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return (u32*)addr;
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}
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}
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return NULL;
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}
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u16* memsearch16(const u16* start, u32 dataSize, const u16* find, u32 findSize, bool forward) {
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u32 dataLen = dataSize/sizeof(u16);
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u32 findLen = findSize/sizeof(u16);
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const u16* end = forward ? (start + dataLen) : (start - dataLen);
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for (u16* addr = (u16*)start; addr != end; forward ? ++addr : --addr) {
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bool found = true;
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for (u32 j = 0; j < findLen; ++j) {
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if (addr[j] != find[j]) {
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found = false;
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break;
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}
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}
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if (found) {
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return (u16*)addr;
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}
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}
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return NULL;
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}
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/*
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* Boyer-Moore Horspool algorithm
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*/
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/*u8* memsearch(const u8* start, u32 dataSize, const u8* find, u32 findSize) {
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u32 dataLen = dataSize/sizeof(u8);
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u32 findLen = findSize/sizeof(u8);
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u32 table[TABLE_SIZE];
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// Preprocessing
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for (u32 i = 0; i < TABLE_SIZE; ++i) {
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table[i] = findLen;
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}
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for (u32 i = 0; i < findLen - 1; ++i) {
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table[find[i]] = findLen - i - 1;
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}
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// Searching
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u32 j = 0;
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while (j <= dataLen - findLen) {
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u8 c = start[j + findLen - 1];
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if (find[findLen - 1] == c && memcmp(find, start + j, findLen - 1) == 0) {
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return (u8*)start + j;
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}
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j += table[c];
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}
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return NULL;
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}*/
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/*
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* Quick Search algorithm
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*/
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/*u8* memsearch(const u8* start, u32 dataSize, const u8* find, u32 findSize) {
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u32 dataLen = dataSize/sizeof(u8);
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u32 findLen = findSize/sizeof(u8);
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u32 table[TABLE_SIZE];
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// Preprocessing
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for (u32 i = 0; i < TABLE_SIZE; ++i) {
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table[i] = findLen + 1;
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}
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for (u32 i = 0; i < findLen; ++i) {
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table[find[i]] = findLen - i;
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}
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// Searching
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u32 j = 0;
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while (j <= dataLen - findLen) {
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if (memcmp(find, start + j, findLen) == 0) {
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return (u8*)start + j;
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}
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j += table[start[j + findLen]];
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}
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return NULL;
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}*/
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