Fixups for env_copy with large files

wsize was being truncated to 32bits on Windows.
Only try to write 1GB at a time on Windows64;
larger writes fail with ERROR_WORKING_SET_QUOTA.

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index d2cea63670adc036fa67e72b13071172cd675047..ff0d883e3575530ad4ecc4cf13588e8cf1e8506f 100644 (file)
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -1271,7 +1271,7 @@ typedef struct MDB_ntxn {
 #endif
 
        /** max bytes to write in one call */
-#define MAX_WRITE              (0x80000000U >> (sizeof(ssize_t) == 4))
+#define MAX_WRITE              (0x40000000U >> (sizeof(ssize_t) == 4))
 
        /** Check \b txn and \b dbi arguments to a function */
 #define TXN_DBI_EXIST(txn, dbi, validity) \
@@ -9157,7 +9157,7 @@ mdb_env_copyfd0(MDB_env *env, HANDLE fd)
        MDB_txn *txn = NULL;
        mdb_mutexref_t wmutex = NULL;
        int rc;
-       size_t wsize;
+       size_t wsize, w3;
        char *ptr;
 #ifdef _WIN32
        DWORD len, w2;
@@ -9216,15 +9216,15 @@ mdb_env_copyfd0(MDB_env *env, HANDLE fd)
        if (rc)
                goto leave;
 
-       w2 = txn->mt_next_pgno * env->me_psize;
+       w3 = txn->mt_next_pgno * env->me_psize;
        {
                size_t fsize = 0;
                if ((rc = mdb_fsize(env->me_fd, &fsize)))
                        goto leave;
-               if (w2 > fsize)
-                       w2 = fsize;
+               if (w3 > fsize)
+                       w3 = fsize;
        }
-       wsize = w2 - wsize;
+       wsize = w3 - wsize;
        while (wsize > 0) {
                if (wsize > MAX_WRITE)
                        w2 = MAX_WRITE;