mirror of https://github.com/bsnes-emu/bsnes.git
111 lines
2.7 KiB
C++
Executable File
111 lines
2.7 KiB
C++
Executable File
#ifndef NALL_IPS_HPP
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#define NALL_IPS_HPP
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#include <nall/file.hpp>
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#include <nall/stdint.hpp>
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#include <nall/string.hpp>
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namespace nall {
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struct ips {
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inline bool apply();
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inline void source(const uint8_t *data, unsigned size);
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inline void modify(const uint8_t *data, unsigned size);
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inline bool source(const string &filename);
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inline bool modify(const string &filename);
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inline ips();
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inline ~ips();
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uint8_t *data;
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unsigned size;
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const uint8_t *sourceData;
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unsigned sourceSize;
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const uint8_t *modifyData;
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unsigned modifySize;
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};
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bool ips::apply() {
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if(modifySize < 8) return false;
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if(modifyData[0] != 'P') return false;
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if(modifyData[1] != 'A') return false;
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if(modifyData[2] != 'T') return false;
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if(modifyData[3] != 'C') return false;
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if(modifyData[4] != 'H') return false;
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if(data) delete[] data;
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data = new uint8_t[16 * 1024 * 1024 + 65536](); //maximum size of IPS patch + single-tag padding
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size = sourceSize;
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memcpy(data, sourceData, sourceSize);
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unsigned offset = 5;
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while(true) {
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unsigned address, length;
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if(offset > modifySize - 3) break;
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address = modifyData[offset++] << 16;
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address |= modifyData[offset++] << 8;
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address |= modifyData[offset++] << 0;
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if(address == 0x454f46) { //EOF
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if(offset == modifySize) return true;
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if(offset == modifySize - 3) {
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size = modifyData[offset++] << 16;
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size |= modifyData[offset++] << 8;
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size |= modifyData[offset++] << 0;
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return true;
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}
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}
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if(offset > modifySize - 2) break;
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length = modifyData[offset++] << 8;
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length |= modifyData[offset++] << 0;
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if(length) { //Copy
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if(offset > modifySize - length) break;
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while(length--) data[address++] = modifyData[offset++];
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} else { //RLE
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if(offset > modifySize - 3) break;
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length = modifyData[offset++] << 8;
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length |= modifyData[offset++] << 0;
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if(length == 0) break; //illegal
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while(length--) data[address++] = modifyData[offset];
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offset++;
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}
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size = max(size, address);
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}
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delete[] data;
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data = nullptr;
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return false;
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}
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void ips::source(const uint8_t *data, unsigned size) {
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sourceData = data, sourceSize = size;
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}
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void ips::modify(const uint8_t *data, unsigned size) {
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modifyData = data, modifySize = size;
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}
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bool ips::source(const string &filename) {
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return file::read(filename, sourceData, sourceSize);
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}
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bool ips::modify(const string &filename) {
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return file::read(filename, modifyData, modifySize);
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}
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ips::ips() : data(nullptr), sourceData(nullptr), modifyData(nullptr) {
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}
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ips::~ips() {
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if(data) delete[] data;
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if(sourceData) delete[] sourceData;
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if(modifyData) delete[] modifyData;
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}
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}
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#endif
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