get roms more room. (Glauber Costa)

[qemu] / cutils.c

diff --git a/cutils.c b/cutils.c
index 80a7a1d..658746b 100644 (file)
--- a/cutils.c
+++ b/cutils.c
@@ -109,6 +109,7 @@ void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint)
     qiov->iov = qemu_malloc(alloc_hint * sizeof(struct iovec));
     qiov->niov = 0;
     qiov->nalloc = alloc_hint;
+    qiov->size = 0;
 }
 
 void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len)
@@ -119,6 +120,7 @@ void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len)
     }
     qiov->iov[qiov->niov].iov_base = base;
     qiov->iov[qiov->niov].iov_len = len;
+    qiov->size += len;
     ++qiov->niov;
 }
 
@@ -127,6 +129,12 @@ void qemu_iovec_destroy(QEMUIOVector *qiov)
     qemu_free(qiov->iov);
 }
 
+void qemu_iovec_reset(QEMUIOVector *qiov)
+{
+    qiov->niov = 0;
+    qiov->size = 0;
+}
+
 void qemu_iovec_to_buffer(QEMUIOVector *qiov, void *buf)
 {
     uint8_t *p = (uint8_t *)buf;
@@ -138,13 +146,18 @@ void qemu_iovec_to_buffer(QEMUIOVector *qiov, void *buf)
     }
 }
 
-void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf)
+void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count)
 {
     const uint8_t *p = (const uint8_t *)buf;
+    size_t copy;
     int i;
 
-    for (i = 0; i < qiov->niov; ++i) {
-        memcpy(qiov->iov[i].iov_base, p, qiov->iov[i].iov_len);
-        p += qiov->iov[i].iov_len;
+    for (i = 0; i < qiov->niov && count; ++i) {
+        copy = count;
+        if (copy > qiov->iov[i].iov_len)
+            copy = qiov->iov[i].iov_len;
+        memcpy(qiov->iov[i].iov_base, p, copy);
+        p     += copy;
+        count -= copy;
     }
 }