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fix(file): check sum

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源文雨
2024-04-05 14:00:35 +09:00
parent 2c1db601a6
commit e5f8c0fc46
3 changed files with 68 additions and 106 deletions
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55
binary.h
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@@ -87,33 +87,15 @@
// leftrotate function definition
#define LEFTROTATE(x, c) (((x) << (c)) | ((x) >> (sizeof(x)*8 - (c))))
static inline uint32_t calc_sum(uint32_t sum, size_t cnt, char* encbuf) {
uint32_t i;
#ifdef DEBUG
fprintf(stderr, "cnt: %zu, roundin: %08x, ", cnt, sum);
#endif
for(i = 0; i < cnt/sizeof(sum); i++) {
#ifdef DEBUG
if (!i) {
fprintf(stderr, "firstval: %08x, ", htobe32(((uint32_t*)encbuf)[i]));
}
#endif
sum += ~LEFTROTATE(htobe32(((uint32_t*)encbuf)[i]), encbuf[i*sizeof(sum)]%(8*sizeof(sum)));
static inline uint32_t calc_sum(uint32_t sum, size_t cnt, const char* encbuf) {
size_t i;
uint32_t buf;
for(i = 0; i < cnt; i++) {
buf = (uint32_t)(encbuf[i])&0xff;
buf = ((buf<<(24-6))&0x03000000) | ((buf<<(16-4))&0x00030000) | ((buf<<(8-2))&0x00000300) | (buf&0x03);
sum += buf;
sum = ~LEFTROTATE(sum, 3);
}
#ifdef DEBUG
fprintf(stderr, "roundmid: %08x", sum);
#endif
size_t rem = cnt % sizeof(sum);
if(rem) {
uint32_t x = htobe32(((uint32_t*)encbuf)[i]) & (0xffffffff << (8*(sizeof(sum)-rem)));
sum += ~LEFTROTATE(x, encbuf[i*sizeof(sum)]%(8*sizeof(sum)));
#ifdef DEBUG
fprintf(stderr, ", roundrem:%08x\n", sum);
#endif
}
#ifdef DEBUG
else fprintf(stderr, "\n");
#endif
return sum;
}
@@ -125,19 +107,14 @@ static inline uint32_t calc_and_embed_sum(uint32_t sum, size_t cnt, char* encbuf
return sum;
}
static inline int calc_and_check_sum(uint32_t* s, size_t cnt, char* encbuf) {
uint32_t sum = calc_sum(*s, cnt, encbuf);
if(cnt%7) { // is last decode block
int shift = (int[]){0, 26, 20, 28, 22, 30, 24}[cnt%7];
uint32_t sum_read = be32toh((*(uint32_t*)(&encbuf[cnt]))) >> shift;
sum >>= shift;
#ifdef DEBUG
fprintf(stderr, "cntrm: %lu, mysum: %08x, sumrd: %08x\n", cnt%7, sum, sum_read);
#endif
return sum != sum_read;
}
*s = sum;
return 0;
static inline int check_sum(uint32_t sum, uint32_t sum_read_raw, int offset) {
int shift = (int[]){0, 26, 20, 28, 22, 30, 24}[offset%7];
uint32_t sum_read = be32toh(sum_read_raw) >> shift;
sum >>= shift;
#ifdef DEBUG
fprintf(stderr, "offset: %d, mysum: %08x, sumrd: %08x\n", offset, sum, sum_read);
#endif
return sum != sum_read;
}
#endif