/* NB: does not preserve file position! */
static uint32_t find_cdf_offset(void)
{
cde_header_t cde_header;
unsigned char *p;
off_t end;
unsigned char *buf = xzalloc(PEEK_FROM_END);
end = xlseek(zip_fd, 0, SEEK_END);
end -= PEEK_FROM_END;
if (end < 0)
end = 0;
xlseek(zip_fd, end, SEEK_SET);
full_read(zip_fd, buf, PEEK_FROM_END);
p = buf;
while (p <= buf + PEEK_FROM_END - CDE_HEADER_LEN - 4) {
if (*p != 'P') {
p++;
continue;
}
if (*++p != 'K')
continue;
if (*++p != 5)
continue;
if (*++p != 6)
continue;
/* we found CDE! */
memcpy(cde_header.raw, p + 1, CDE_HEADER_LEN);
FIX_ENDIANNESS_CDE(cde_header);
free(buf);
return cde_header.formatted.cdf_offset;
}
//free(buf);
bb_error_msg_and_die("can't find file table");
};
/* NB: does not preserve file position! */
static uint32_t find_cdf_offset(void)
{
cde_header_t cde_header;
unsigned char *p;
off_t end;
unsigned char *buf = xzalloc(PEEK_FROM_END);
end = xlseek(zip_fd, 0, SEEK_END);
end -= PEEK_FROM_END;
if (end < 0)
end = 0;
xlseek(zip_fd, end, SEEK_SET);
full_read(zip_fd, buf, PEEK_FROM_END);
cde_header.formatted.cdf_offset = BAD_CDF_OFFSET;
p = buf;
while (p <= buf + PEEK_FROM_END - CDE_HEADER_LEN - 4) {
if (*p != 'P') {
p++;
continue;
}
if (*++p != 'K')
continue;
if (*++p != 5)
continue;
if (*++p != 6)
continue;
/* we found CDE! */
memcpy(cde_header.raw, p + 1, CDE_HEADER_LEN);
FIX_ENDIANNESS_CDE(cde_header);
/*
* I've seen .ZIP files with seemingly valid CDEs
* where cdf_offset points past EOF - ??
* Ignore such CDEs:
*/
if (cde_header.formatted.cdf_offset < end + (p - buf))
break;
cde_header.formatted.cdf_offset = BAD_CDF_OFFSET;
}
free(buf);
return cde_header.formatted.cdf_offset;
};
