typedarray.h

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#ifndef __CWIST_WASM_TYPEDARRAY_H__
#define __CWIST_WASM_TYPEDARRAY_H__
 
#ifdef __EMSCRIPTEN__
 
#include <emscripten.h>
#include <stddef.h>
#include <cwist/sys/app/app.h>
#include <cwist/core/mem/alloc.h>
 
#define CWIST_WASM_EXPORT EMSCRIPTEN_KEEPALIVE
 
#define CWIST_WASM_EXPOSE_ARRAY(name, arr, count)    \
    CWIST_WASM_EXPORT const void *name##_ptr(void) { \
        return (const void *)(arr);                  \
    }                                                \
    CWIST_WASM_EXPORT size_t name##_len(void) {      \
        return (size_t)(count);                      \
    }
#define CWIST_WASM_EXPOSE_I32(name, arr, count) CWIST_WASM_EXPOSE_ARRAY(name, arr, count)
#define CWIST_WASM_EXPOSE_F64(name, arr, count) CWIST_WASM_EXPOSE_ARRAY(name, arr, count)
#define CWIST_WASM_EXPOSE_U8(name, arr, count) CWIST_WASM_EXPOSE_ARRAY(name, arr, count)
 
#define CWIST_WASM_INSTALL_VIEWS()                                            \
    EM_JS(void, cwist_wasm_install_views, (void), {                         \
        /* clang-format off - JS body, not C: `=>` etc. must survive make format */ \
        /* HEAP* bindings are in scope inside EM_JS-generated code. */      \
        if (typeof Module !== "undefined" && !Module.cwistView) {           \
            Module.cwistView = {                                            \
                u8: function (p, n) {                                       \
                    return new Uint8Array(HEAPU8.buffer, p, n);             \
                },                                                          \
                i32: function (p, n) {                                      \
                    return new Int32Array(HEAP32.buffer, p, n);             \
                },                                                          \
                f64: function (p, n) {                                      \
                    return new Float64Array(HEAPF64.buffer, p, n);          \
                },                                                          \
            };                                                                \
    }                                                                         \
        /* clang-format on */                                                     \
    })
 
static inline const char *cwist_wasm_dispatch_memory(cwist_app *app, const char *req_buf,
                                                     size_t req_len, size_t *res_len) {
    if (!res_len) return NULL;
    *res_len = 0;
    char *res_buf = NULL;
    if (cwist_app_dispatch_memory(app, req_buf, req_len, &res_buf, res_len) != 0) return NULL;
    return res_buf;
}
 
static inline void cwist_wasm_free(void *ptr) {
    cwist_free(ptr);
}
 
#else /* !__EMSCRIPTEN__ */
 
/* Native builds: this header intentionally provides nothing.  The helpers
 * only make sense against Emscripten's HEAP views. */
 
#endif /* __EMSCRIPTEN__ */
 
#endif /* __CWIST_WASM_TYPEDARRAY_H__ */