segatools/board/sg-cmd.c

135 lines
2.8 KiB
C
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#include <assert.h>
#include "board/sg-cmd.h"
#include "board/sg-frame.h"
#include "hook/iobuf.h"
#include "util/dprintf.h"
union sg_req_any {
struct sg_req_header req;
uint8_t bytes[256];
};
union sg_res_any {
struct sg_res_header res;
uint8_t bytes[256];
};
static HRESULT sg_req_validate(const void *ptr, size_t nbytes);
static void sg_res_error(
struct sg_res_header *res,
const struct sg_req_header *req);
static HRESULT sg_req_validate(const void *ptr, size_t nbytes)
{
const struct sg_req_header *req;
size_t payload_len;
assert(ptr != NULL);
if (nbytes < sizeof(*req)) {
dprintf("SG Cmd: Request header truncated\n");
return E_FAIL;
}
req = ptr;
if (req->hdr.frame_len != nbytes) {
dprintf("SG Cmd: Frame length mismatch: got %i exp %i\n",
req->hdr.frame_len,
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(int) nbytes);
return E_FAIL;
}
payload_len = req->hdr.frame_len - sizeof(*req);
if (req->payload_len != payload_len) {
dprintf("SG Cmd: Payload length mismatch: got %i exp %i\n",
req->payload_len,
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(int) payload_len);
return E_FAIL;
}
return S_OK;
}
void sg_req_transact(
struct iobuf *res_frame,
const uint8_t *req_bytes,
size_t req_nbytes,
sg_dispatch_fn_t dispatch,
void *ctx)
{
struct iobuf req_span;
union sg_req_any req;
union sg_res_any res;
HRESULT hr;
assert(res_frame != NULL);
assert(req_bytes != NULL);
assert(dispatch != NULL);
req_span.bytes = req.bytes;
req_span.nbytes = sizeof(req.bytes);
req_span.pos = 0;
hr = sg_frame_decode(&req_span, req_bytes, req_nbytes);
if (FAILED(hr)) {
return;
}
hr = sg_req_validate(req.bytes, req_span.pos);
if (FAILED(hr)) {
return;
}
hr = dispatch(ctx, &req, &res);
if (hr != S_FALSE) {
if (FAILED(hr)) {
sg_res_error(&res.res, &req.req);
}
sg_frame_encode(res_frame, res.bytes, res.res.hdr.frame_len);
}
}
void sg_res_init(
struct sg_res_header *res,
const struct sg_req_header *req,
size_t payload_len)
{
assert(res != NULL);
assert(req != NULL);
res->hdr.frame_len = sizeof(*res) + payload_len;
res->hdr.addr = req->hdr.addr;
res->hdr.seq_no = req->hdr.seq_no;
res->hdr.cmd = req->hdr.cmd;
res->status = 0;
res->payload_len = payload_len;
}
static void sg_res_error(
struct sg_res_header *res,
const struct sg_req_header *req)
{
assert(res != NULL);
assert(req != NULL);
res->hdr.frame_len = sizeof(*res);
res->hdr.addr = req->hdr.addr;
res->hdr.seq_no = req->hdr.seq_no;
res->hdr.cmd = req->hdr.cmd;
res->status = 1;
res->payload_len = 0;
}