[Qemu-devel] [PATCH v6 04/11] dump: Add API to write elf notes to buffer

[Qiao Nuohan]

the function can be used by write_elf32_notes/write_elf64_notes to write notes
to a buffer. If fd_write_vmcore is used, write_elf32_notes/write_elf64_notes
will write elf notes to vmcore directly. Instead, if buf_write_note is used,
elf notes will be written to opaque->note_buf at first.

Signed-off-by: Qiao Nuohan <address@hidden>
---
 dump.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/dump.c b/dump.c
index 764db39..3b9cf00 100644
--- a/dump.c
+++ b/dump.c
@@ -76,6 +76,9 @@ typedef struct DumpState {
     int64_t begin;
     int64_t length;
     Error **errp;
+
+    void *note_buf;
+    size_t note_buf_offset;
 } DumpState;
 
 static int dump_cleanup(DumpState *s)
@@ -754,6 +757,22 @@ static int write_buffer(int fd, bool flag_flatten, off_t 
offset, void *buf,
     return 0;
 }
 
+static int buf_write_note(void *buf, size_t size, void *opaque)
+{
+    DumpState *s = opaque;
+
+    /* note_buf is not enough */
+    if (s->note_buf_offset + size > s->note_size) {
+        return -1;
+    }
+
+    memcpy(s->note_buf + s->note_buf_offset, buf, size);
+
+    s->note_buf_offset += size;
+
+    return 0;
+}
+
 static ram_addr_t get_start_block(DumpState *s)
 {
     GuestPhysBlock *block;
-- 
1.7.1