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authorOrit Wasserman <owasserm@redhat.com>2013-01-31 09:12:15 +0200
committerJuan Quintela <quintela@redhat.com>2013-02-01 08:32:20 +0100
commitba2e28e8a20cf78ea4f64fbf84055f969013f9f7 (patch)
tree46f0b5c45f95b3ad8f9d20a8ae770c339ca29175 /savevm.c
parent8a55ebf01507ab73cc458cfcd5b9cb856aba0b9e (diff)
Move XBZRLE encoding code to a separate file to allow testing
Signed-off-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'savevm.c')
-rw-r--r--savevm.c159
1 files changed, 0 insertions, 159 deletions
diff --git a/savevm.c b/savevm.c
index 304d1effe5..b947e6a303 100644
--- a/savevm.c
+++ b/savevm.c
@@ -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;
-}