forked from Dniel97/segatools
135 lines
2.9 KiB
C
135 lines
2.9 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_res_any {
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struct sg_res_header res;
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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_res_error(
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struct sg_res_header *res,
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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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(int) 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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(int) 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 *res_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_res_any res;
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HRESULT hr;
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assert(res_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, &res);
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if (hr != S_FALSE) {
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if (FAILED(hr)) {
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sg_res_error(&res.res, &req.req);
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}
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sg_frame_encode(res_frame, res.bytes, res.res.hdr.frame_len);
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}
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}
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void sg_res_init(
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struct sg_res_header *res,
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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(res != NULL);
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assert(req != NULL);
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res->hdr.frame_len = sizeof(*res) + payload_len;
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res->hdr.addr = req->hdr.addr;
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res->hdr.seq_no = req->hdr.seq_no;
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res->hdr.cmd = req->hdr.cmd;
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res->status = 0;
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res->payload_len = payload_len;
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}
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static void sg_res_error(
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struct sg_res_header *res,
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const struct sg_req_header *req)
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{
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assert(res != NULL);
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assert(req != NULL);
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res->hdr.frame_len = sizeof(*res);
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res->hdr.addr = req->hdr.addr;
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res->hdr.seq_no = req->hdr.seq_no;
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res->hdr.cmd = req->hdr.cmd;
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res->status = 1;
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res->payload_len = 0;
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}
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