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Fix mdb_env_copy

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Just write in 2^31 sized chunks
This commit is contained in:
Howard Chu 2012-12-04 06:30:22 -08:00
parent 04b7c42109
commit 7b10fdde00
1 changed files with 17 additions and 5 deletions
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22
libraries/liblmdb/mdb.c
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@ -3533,22 +3533,34 @@ mdb_env_copy(MDB_env *env, const char *path)
ptr = env->me_map + wsize;
wsize = txn->mt_next_pgno * env->me_psize - wsize;
#define MAX_WRITE 2147483648U
#ifdef _WIN32
#define MAX_UINT32 4294967295U
while (wsize > 0) {
DWORD len, w2;
if (wsize > MAX_UINT32)
w2 = MAX_UINT32 - env->me_psize + 1; /* write in pagesize chunks */
if (wsize > MAX_WRITE)
w2 = MAX_WRITE;
else
w2 = wsize;
rc = WriteFile(newfd, ptr, w2, &len, NULL);
rc = (len == w2) ? MDB_SUCCESS : ErrCode();
if (rc) break;
wsize -= w2;
ptr += w2;
}
#else
rc = write(newfd, ptr, wsize);
rc = (rc == (int)wsize) ? MDB_SUCCESS : ErrCode();
while (wsize > 0) {
size_t w2;
ssize_t wres;
if (wsize > MAX_WRITE)
w2 = MAX_WRITE;
else
w2 = wsize;
wres = write(newfd, ptr, w2);
rc = (wres > 0) ? MDB_SUCCESS : ErrCode();
if (rc) break;
wsize -= wres;
ptr += wres;
}
#endif
mdb_txn_abort(txn);