diff options
-rw-r--r-- | qemu-char.c | 64 | ||||
-rw-r--r-- | qemu-char.h | 7 |
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, |