diff options
Diffstat (limited to 'savevm.c')
-rw-r--r-- | savevm.c | 159 |
1 files changed, 0 insertions, 159 deletions
@@ -2388,162 +2388,3 @@ void vmstate_register_ram_global(MemoryRegion *mr) { vmstate_register_ram(mr, NULL); } - -/* - page = zrun nzrun - | zrun nzrun page - - zrun = length - - nzrun = length byte... - - length = uleb128 encoded integer - */ -int xbzrle_encode_buffer(uint8_t *old_buf, uint8_t *new_buf, int slen, - uint8_t *dst, int dlen) -{ - uint32_t zrun_len = 0, nzrun_len = 0; - int d = 0, i = 0; - long res, xor; - uint8_t *nzrun_start = NULL; - - g_assert(!(((uintptr_t)old_buf | (uintptr_t)new_buf | slen) % - sizeof(long))); - - while (i < slen) { - /* overflow */ - if (d + 2 > dlen) { - return -1; - } - - /* not aligned to sizeof(long) */ - res = (slen - i) % sizeof(long); - while (res && old_buf[i] == new_buf[i]) { - zrun_len++; - i++; - res--; - } - - /* word at a time for speed */ - if (!res) { - while (i < slen && - (*(long *)(old_buf + i)) == (*(long *)(new_buf + i))) { - i += sizeof(long); - zrun_len += sizeof(long); - } - - /* go over the rest */ - while (i < slen && old_buf[i] == new_buf[i]) { - zrun_len++; - i++; - } - } - - /* buffer unchanged */ - if (zrun_len == slen) { - return 0; - } - - /* skip last zero run */ - if (i == slen) { - return d; - } - - d += uleb128_encode_small(dst + d, zrun_len); - - zrun_len = 0; - nzrun_start = new_buf + i; - - /* overflow */ - if (d + 2 > dlen) { - return -1; - } - /* not aligned to sizeof(long) */ - res = (slen - i) % sizeof(long); - while (res && old_buf[i] != new_buf[i]) { - i++; - nzrun_len++; - res--; - } - - /* word at a time for speed, use of 32-bit long okay */ - if (!res) { - /* truncation to 32-bit long okay */ - long mask = (long)0x0101010101010101ULL; - while (i < slen) { - xor = *(long *)(old_buf + i) ^ *(long *)(new_buf + i); - if ((xor - mask) & ~xor & (mask << 7)) { - /* found the end of an nzrun within the current long */ - while (old_buf[i] != new_buf[i]) { - nzrun_len++; - i++; - } - break; - } else { - i += sizeof(long); - nzrun_len += sizeof(long); - } - } - } - - d += uleb128_encode_small(dst + d, nzrun_len); - /* overflow */ - if (d + nzrun_len > dlen) { - return -1; - } - memcpy(dst + d, nzrun_start, nzrun_len); - d += nzrun_len; - nzrun_len = 0; - } - - return d; -} - -int xbzrle_decode_buffer(uint8_t *src, int slen, uint8_t *dst, int dlen) -{ - int i = 0, d = 0; - int ret; - uint32_t count = 0; - - while (i < slen) { - - /* zrun */ - if ((slen - i) < 2) { - return -1; - } - - ret = uleb128_decode_small(src + i, &count); - if (ret < 0 || (i && !count)) { - return -1; - } - i += ret; - d += count; - - /* overflow */ - if (d > dlen) { - return -1; - } - - /* nzrun */ - if ((slen - i) < 2) { - return -1; - } - - ret = uleb128_decode_small(src + i, &count); - if (ret < 0 || !count) { - return -1; - } - i += ret; - - /* overflow */ - if (d + count > dlen || i + count > slen) { - return -1; - } - - memcpy(dst + d, src + i, count); - d += count; - i += count; - } - - return d; -} |