mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-25 02:55:33 +00:00
42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
#include <sys/mman.h>
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#include <base.hpp>
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#include "magiskboot.hpp"
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using namespace std;
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static void hex2byte(const char *hex, uint8_t *buf) {
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char high, low;
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for (int i = 0, length = strlen(hex); i < length; i += 2) {
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high = toupper(hex[i]) - '0';
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low = toupper(hex[i + 1]) - '0';
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buf[i / 2] = ((high > 9 ? high - 7 : high) << 4) + (low > 9 ? low - 7 : low);
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}
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}
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int hexpatch(const char *file, const char *from, const char *to) {
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int patched = 1;
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auto m = mmap_data(file, true);
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vector<uint8_t> pattern(strlen(from) / 2);
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vector<uint8_t> patch(strlen(to) / 2);
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hex2byte(from, pattern.data());
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hex2byte(to, patch.data());
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uint8_t * const end = m.buf + m.sz;
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for (uint8_t *curr = m.buf; curr < end; curr += pattern.size()) {
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curr = static_cast<uint8_t*>(memmem(curr, end - curr, pattern.data(), pattern.size()));
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if (curr == nullptr)
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return patched;
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fprintf(stderr, "Patch @ %08X [%s] -> [%s]\n", (unsigned)(curr - m.buf), from, to);
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memset(curr, 0, pattern.size());
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memcpy(curr, patch.data(), patch.size());
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patched = 0;
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}
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return patched;
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}
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