docs.sheetjs.com/docz/static/duk/SheetJSDuk.php

<?php

$sofile = './libduktape.207.20700.so';

$ffi = FFI::cdef('
typedef int duk_int_t;
typedef unsigned int duk_uint_t;
typedef unsigned int duk_small_uint_t;
typedef size_t duk_size_t;
typedef duk_int_t duk_idx_t;
typedef duk_small_uint_t duk_bool_t;

typedef struct duk_hthread duk_context;

void duk_push_undefined(duk_context *ctx);
const char *duk_push_lstring(duk_context *ctx, const char *str, duk_size_t len);
duk_int_t duk_eval_raw(duk_context *ctx, const char *src_buffer, duk_size_t src_length, duk_uint_t flags);
void duk_pop(duk_context *ctx);
void duk_config_buffer(duk_context *ctx, duk_idx_t idx, void *ptr, duk_size_t len);
void *duk_push_buffer_raw(duk_context *ctx, duk_size_t size, duk_small_uint_t flags);
duk_bool_t duk_put_global_string(duk_context *ctx, const char *key);
duk_bool_t duk_get_global_string(duk_context *ctx, const char *key);
void *duk_get_buffer_data(duk_context *ctx, duk_idx_t idx, duk_size_t *out_size);
const char *duk_safe_to_lstring(duk_context *ctx, duk_idx_t idx, duk_size_t *out_len);
void duk_destroy_heap(duk_context *ctx);
duk_int_t duk_eval_raw(duk_context *ctx, const char *src_buffer, duk_size_t src_length, duk_uint_t flags);
duk_context *duk_create_heap(void* alloc_func, void* realloc_func, void* free_func, void *heap_udata, void *fatal_handler);
const char *duk_get_string(duk_context *ctx, duk_idx_t idx);
', $sofile );

function duk_create_heap_default() { global $ffi;	return $ffi->duk_create_heap(null, null, null, null, null); }
function duk_eval_string_noresult($context, $cmd) { global $ffi; return $ffi->duk_eval_raw($context, $cmd, 0, 1 | (1<<3) | (1<<9) | (1<<10) | (1<<8) | (1<<11) ); }
function duk_eval_string($context, $cmd) { global $ffi; return $ffi->duk_eval_raw($context, $cmd, 0, 0 | (1<<3) | (1<<9) | (1<<10) | (1<<11) ); }
function duk_peval($context) { global $ffi; return $ffi->duk_eval_raw($context, null, 0, 1 | (1<<3) | (1<<7) | (1<<11) ); }
function duk_get_string($context, $idx) { global $ffi; return $ffi->duk_get_string($context, $idx); }
function duk_pop($context) { global $ffi; return $ffi->duk_pop($context); }

function eval_file($context, $path) {
  global $ffi;
  $script = file_get_contents($path);
  $ffi->duk_push_lstring($context, $script, strlen($script));
  $retval = duk_peval($context);
  $ffi->duk_pop($context);
  return $retval;
}
function load_file($context, $path, $var) {
  global $ffi;
  $data = file_get_contents($path);

  $ffi->duk_push_buffer_raw($context, 0, 1 | 2);
  $ffi->duk_config_buffer($context, -1, $data, strlen($data));
  $ffi->duk_put_global_string($context, $var);
  return 0;
}
function save_file($context, $path, $var) {
  global $ffi;
  $ffi->duk_get_global_string($context, $var);

  $sz = $ffi->new("duk_size_t");
  $ptr = $ffi->duk_get_buffer_data($context, -1, FFI::addr($sz));
  $buf = FFI::string($ptr, strval($sz));

  $fh = fopen($path, "wb");
  fwrite($fh, $buf, strval($sz));
  fclose($fh);
}

function DOIT($cmd) { global $context; return duk_eval_string_noresult($context, $cmd); }

/* initialize */
$context = duk_create_heap_default();
/* duktape does not expose a standard "global" by default */
DOIT("var global = (function(){ return this; }).call(null);");

/* load library */
eval_file($context, "shim.min.js");
eval_file($context, "xlsx.full.min.js");

/* get version string */
duk_eval_string($context, "XLSX.version");
printf("SheetJS Library Version %s\n", duk_get_string($context, -1));
duk_pop($context);

/* read file */
$res = load_file($context, $argv[1], "buf");
printf("Loaded file %s\n", $argv[1]);

/* parse workbook */
DOIT("wb = XLSX.read(buf.slice(0, buf.length), {type:'buffer'});");
DOIT("ws = wb.Sheets[wb.SheetNames[0]]");

/* print CSV */
duk_eval_string($context, "XLSX.utils.sheet_to_csv(ws)");
printf("%s\n", duk_get_string($context, -1));
duk_pop($context);

/* write file */
DOIT("newbuf = (XLSX.write(wb, {type:'array', bookType:'xlsb'}));");
save_file($context, "sheetjsw.xlsb", "newbuf");

/* cleanup */
$ffi->duk_destroy_heap($context);
return 0;