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-rw-r--r--qemu-char.c64
-rw-r--r--qemu-char.h7
2 files changed, 71 insertions, 0 deletions
diff --git a/qemu-char.c b/qemu-char.c
index 88997f9d5a..edc9ad6851 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -2275,6 +2275,70 @@ static CharDriverState *qemu_chr_open_socket(QemuOpts *opts)
return NULL;
}
+/***********************************************************/
+/* Memory chardev */
+typedef struct {
+ size_t outbuf_size;
+ size_t outbuf_capacity;
+ uint8_t *outbuf;
+} MemoryDriver;
+
+static int mem_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
+{
+ MemoryDriver *d = chr->opaque;
+
+ /* TODO: the QString implementation has the same code, we should
+ * introduce a generic way to do this in cutils.c */
+ if (d->outbuf_capacity < d->outbuf_size + len) {
+ /* grow outbuf */
+ d->outbuf_capacity += len;
+ d->outbuf_capacity *= 2;
+ d->outbuf = qemu_realloc(d->outbuf, d->outbuf_capacity);
+ }
+
+ memcpy(d->outbuf + d->outbuf_size, buf, len);
+ d->outbuf_size += len;
+
+ return len;
+}
+
+void qemu_chr_init_mem(CharDriverState *chr)
+{
+ MemoryDriver *d;
+
+ d = qemu_malloc(sizeof(*d));
+ d->outbuf_size = 0;
+ d->outbuf_capacity = 4096;
+ d->outbuf = qemu_mallocz(d->outbuf_capacity);
+
+ memset(chr, 0, sizeof(*chr));
+ chr->opaque = d;
+ chr->chr_write = mem_chr_write;
+}
+
+QString *qemu_chr_mem_to_qs(CharDriverState *chr)
+{
+ MemoryDriver *d = chr->opaque;
+ return qstring_from_substr((char *) d->outbuf, 0, d->outbuf_size - 1);
+}
+
+/* NOTE: this driver can not be closed with qemu_chr_close()! */
+void qemu_chr_close_mem(CharDriverState *chr)
+{
+ MemoryDriver *d = chr->opaque;
+
+ qemu_free(d->outbuf);
+ qemu_free(chr->opaque);
+ chr->opaque = NULL;
+ chr->chr_write = NULL;
+}
+
+size_t qemu_chr_mem_osize(const CharDriverState *chr)
+{
+ const MemoryDriver *d = chr->opaque;
+ return d->outbuf_size;
+}
+
QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename)
{
char host[65], port[33], width[8], height[8];
diff --git a/qemu-char.h b/qemu-char.h
index 18ad12bb5d..e6ee6c4bc9 100644
--- a/qemu-char.h
+++ b/qemu-char.h
@@ -6,6 +6,7 @@
#include "qemu-option.h"
#include "qemu-config.h"
#include "qobject.h"
+#include "qstring.h"
/* character device */
@@ -100,6 +101,12 @@ CharDriverState *qemu_chr_open_eventfd(int eventfd);
extern int term_escape_char;
+/* memory chardev */
+void qemu_chr_init_mem(CharDriverState *chr);
+void qemu_chr_close_mem(CharDriverState *chr);
+QString *qemu_chr_mem_to_qs(CharDriverState *chr);
+size_t qemu_chr_mem_osize(const CharDriverState *chr);
+
/* async I/O support */
int qemu_set_fd_handler2(int fd,