forked from Dniel97/segatools
135 lines
2.8 KiB
C
135 lines
2.8 KiB
C
#include <assert.h>
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#include "board/sg-cmd.h"
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#include "board/sg-frame.h"
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#include "hook/iobuf.h"
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#include "util/dprintf.h"
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union sg_req_any {
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struct sg_req_header req;
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uint8_t bytes[256];
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};
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union sg_resp_any {
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struct sg_resp_header resp;
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uint8_t bytes[256];
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};
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static HRESULT sg_req_validate(const void *ptr, size_t nbytes);
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static void sg_resp_error(
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struct sg_resp_header *resp,
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const struct sg_req_header *req);
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static HRESULT sg_req_validate(const void *ptr, size_t nbytes)
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{
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const struct sg_req_header *req;
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size_t payload_len;
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assert(ptr != NULL);
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if (nbytes < sizeof(*req)) {
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dprintf("SG Cmd: Request header truncated\n");
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return E_FAIL;
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}
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req = ptr;
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if (req->hdr.frame_len != nbytes) {
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dprintf("SG Cmd: Frame length mismatch: got %i exp %i\n",
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req->hdr.frame_len,
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nbytes);
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return E_FAIL;
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}
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payload_len = req->hdr.frame_len - sizeof(*req);
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if (req->payload_len != payload_len) {
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dprintf("SG Cmd: Payload length mismatch: got %i exp %i\n",
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req->payload_len,
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payload_len);
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return E_FAIL;
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}
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return S_OK;
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}
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void sg_req_transact(
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struct iobuf *resp_frame,
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const uint8_t *req_bytes,
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size_t req_nbytes,
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sg_dispatch_fn_t dispatch,
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void *ctx)
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{
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struct iobuf req_span;
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union sg_req_any req;
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union sg_resp_any resp;
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HRESULT hr;
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assert(resp_frame != NULL);
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assert(req_bytes != NULL);
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assert(dispatch != NULL);
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req_span.bytes = req.bytes;
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req_span.nbytes = sizeof(req.bytes);
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req_span.pos = 0;
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hr = sg_frame_decode(&req_span, req_bytes, req_nbytes);
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if (FAILED(hr)) {
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return;
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}
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hr = sg_req_validate(req.bytes, req_span.pos);
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if (FAILED(hr)) {
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return;
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}
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hr = dispatch(ctx, &req, &resp);
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if (hr != S_FALSE) {
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if (FAILED(hr)) {
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sg_resp_error(&resp.resp, &req.req);
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}
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sg_frame_encode(resp_frame, resp.bytes, resp.resp.hdr.frame_len);
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}
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}
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void sg_resp_init(
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struct sg_resp_header *resp,
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const struct sg_req_header *req,
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size_t payload_len)
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{
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assert(resp != NULL);
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assert(req != NULL);
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resp->hdr.frame_len = sizeof(*resp) + payload_len;
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resp->hdr.addr = req->hdr.addr;
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resp->hdr.seq_no = req->hdr.seq_no;
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resp->hdr.cmd = req->hdr.cmd;
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resp->status = 0;
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resp->payload_len = payload_len;
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}
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static void sg_resp_error(
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struct sg_resp_header *resp,
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const struct sg_req_header *req)
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{
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assert(resp != NULL);
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assert(req != NULL);
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resp->hdr.frame_len = sizeof(*resp);
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resp->hdr.addr = req->hdr.addr;
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resp->hdr.seq_no = req->hdr.seq_no;
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resp->hdr.cmd = req->hdr.cmd;
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resp->status = 1;
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resp->payload_len = 0;
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}
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