76 lines
1.7 KiB
C++
76 lines
1.7 KiB
C++
#include <malloc.h>
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#include <string.h>
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#include <utils.h>
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#include "magiskboot.h"
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#define MATCH(p) else if (strncmp(s + skip, p, sizeof(p) - 1) == 0) skip += (sizeof(p) - 1)
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static int check_verity_pattern(const char *s) {
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int skip = s[0] == ',';
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if (0) {}
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MATCH("verify");
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MATCH("avb");
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MATCH("support_scfs");
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else return -1;
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if (s[skip] == '=') {
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while (s[skip] != '\0' && s[skip] != ' ' && s[skip] != '\n' && s[skip] != ',')
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++skip;
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}
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return skip;
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}
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#undef MATCH
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#define MATCH(p) else if (strncmp(s, p, sizeof(p) - 1) == 0) return (sizeof(p) - 1)
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static int check_encryption_pattern(const char *s) {
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if (0) {}
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MATCH("forceencrypt");
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MATCH("forcefdeorfbe");
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MATCH("fileencryption");
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else return -1;
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}
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char *patch_verity(const void *buf, uint32_t &size, bool inplace) {
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auto src = static_cast<const char *>(buf);
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auto dest = (char *)(inplace ? buf : xmalloc(size));
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int src_size = size;
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bool found = false;
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int write = 0;
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for (int read = 0; read < src_size;) {
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if (int skip; (skip = check_verity_pattern(src + read)) > 0) {
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fprintf(stderr, "Found pattern [%.*s]\n", skip, src + read);
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size -= skip;
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read += skip;
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found = true;
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} else {
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dest[write++] = src[read++];
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}
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}
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dest[write] = '\0';
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if (!found) {
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if (!inplace)
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free(dest);
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return nullptr;
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}
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return dest;
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}
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void patch_encryption(void *buf, uint32_t &size) {
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auto src = static_cast<char *>(buf);
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int src_size = size;
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int write = 0;
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for (int read = 0; read < src_size; ++read, ++write) {
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if (int skip; (skip = check_encryption_pattern(src + read)) > 0) {
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fprintf(stderr, "Found pattern [%.*s]\n", skip, src + read);
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size -= skip;
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read += skip;
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}
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src[write] = src[read];
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}
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src[write] = '\0';
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}
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