QEMUFile *qemu_bufopen(const char *mode, QEMUSizedBuffer *input)
{
QEMUBuffer *s;
if (mode == NULL || (mode[0] != 'r' && mode[0] != 'w') ||
mode[1] != '\0') {
error_report("qemu_bufopen: Argument validity check failed");
return NULL;
}
s = g_malloc0(sizeof(QEMUBuffer));
s->qsb = input;
if (s->qsb == NULL) {
s->qsb = qsb_create(NULL, 0);
s->qsb_allocated = true;
}
if (!s->qsb) {
g_free(s);
error_report("qemu_bufopen: qsb_create failed");
return NULL;
}
if (mode[0] == 'r') {
s->file = qemu_fopen_ops(s, &buf_read_ops);
} else {
s->file = qemu_fopen_ops(s, &buf_write_ops);
}
return s->file;
}
/* Open a read-only qemu-file from an existing memory block */
static QEMUFile *open_mem_file_read(const void *data, size_t len)
{
/* The qsb gets freed by qemu_fclose */
QEMUSizedBuffer *qsb = qsb_create(data, len);
g_assert(qsb);
return qemu_bufopen("r", qsb);
}
/**
* Create a deep copy of the given QEMUSizedBuffer.
*
* @qsb: A QEMUSizedBuffer
*
* Returns a clone of @qsb or NULL on allocation failure
*/
QEMUSizedBuffer *qsb_clone(const QEMUSizedBuffer *qsb)
{
QEMUSizedBuffer *out = qsb_create(NULL, qsb_get_length(qsb));
size_t i;
ssize_t res;
off_t pos = 0;
if (!out) {
return NULL;
}
for (i = 0; i < qsb->n_iov; i++) {
res = qsb_write_at(out, qsb->iov[i].iov_base,
pos, qsb->iov[i].iov_len);
if (res < 0) {
qsb_free(out);
return NULL;
}
pos += res;
}
return out;
}