forked from sheetjs/docs.sheetjs.com
116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "maplec.h"
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#include "duktape.h"
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/* --- EXPORT_DECL macro from official example --- */
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#if !defined(EXPORT_DECL)
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#ifdef _MSC_VER
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#define EXPORT_DECL __declspec(dllexport)
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#else
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#define EXPORT_DECL
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#endif
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#endif
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/* --- the SheetJS + Duktape demo cover these machinations --- */
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#define FAIL_LOAD { \
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duk_push_undefined(ctx); \
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perror("Error in load_file"); \
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return 1; \
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}
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static char *read_file(const char *filename, size_t *sz) {
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FILE *f = fopen(filename, "rb");
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if(!f) return NULL;
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long fsize; { fseek(f, 0, SEEK_END); fsize = ftell(f); fseek(f, 0, SEEK_SET); }
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char *buf = (char *)malloc(fsize * sizeof(char));
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*sz = fread((void *) buf, 1, fsize, f);
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fclose(f);
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return buf;
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}
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static duk_int_t eval_file(duk_context *ctx, const char *filename) {
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size_t len; char *buf = read_file(filename, &len);
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if(!buf) FAIL_LOAD
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duk_push_lstring(ctx, (const char *)buf, (duk_size_t)len);
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duk_int_t retval = duk_peval(ctx);
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duk_pop(ctx);
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return retval;
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}
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static duk_int_t load_file(duk_context *ctx, const char *filename, const char *var) {
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size_t len; char *buf = read_file(filename, &len);
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if(!buf) FAIL_LOAD
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duk_push_external_buffer(ctx);
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duk_config_buffer(ctx, -1, buf, len);
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duk_put_global_string(ctx, var);
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return 0;
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}
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static duk_int_t save_file(duk_context *ctx, const char *filename, const char *var) {
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duk_get_global_string(ctx, var);
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duk_size_t sz;
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char *buf = (char *)duk_get_buffer_data(ctx, -1, &sz);
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if(!buf) return 1;
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FILE *f = fopen(filename, "wb"); fwrite(buf, 1, sz, f); fclose(f);
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return 0;
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}
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#define FAIL_DUK(cmd) { \
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const char *errmsg = duk_safe_to_string(ctx, -1); \
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duk_destroy_heap(ctx); \
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MapleRaiseError2(kv, "error in %1 : %2", ToMapleString(kv, cmd), ToMapleString(kv, errmsg)); \
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return NULL; \
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}
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#define DOIT(cmd) duk_eval_string_noresult(ctx, cmd);
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/* SheetToXLSX function */
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EXPORT_DECL ALGEB M_DECL SheetToXLSX( MKernelVector kv, ALGEB *args ) {
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duk_int_t res = 0;
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/* get filename */
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if(MapleNumArgs(kv, (ALGEB)args) != 1) {
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MapleRaiseError(kv, "must specify a filename");
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return NULL;
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}
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if(!IsMapleString(kv, args[1])) {
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MapleRaiseError(kv, "filename must be a string");
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return NULL;
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}
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const char *filename = MapleToString(kv, args[1]);
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/* initialize duktape */
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duk_context *ctx = duk_create_heap_default();
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/* duktape does not expose a standard "global" by default */
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DOIT("var global = (function(){ return this; }).call(null);");
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/* load SheetJS library */
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res = eval_file(ctx, "shim.min.js");
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if(res != 0) FAIL_DUK("shim load")
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res = eval_file(ctx, "xlsx.full.min.js");
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if(res != 0) FAIL_DUK("library load")
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/* read file */
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res = load_file(ctx, filename, "buf");
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if(res != 0) FAIL_DUK("file load")
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printf("Loaded file %s\n", filename);
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/* parse workbook and write to XLSX */
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DOIT("wb = XLSX.read(buf.slice(0, buf.length), {type:'buffer'});");
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DOIT("newbuf = (XLSX.write(wb, {type:'array', bookType:'xlsx'}));");\
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/* write file */
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res = save_file(ctx, "sheetjsw.xlsx", "newbuf");\
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if(res != 0) FAIL_DUK("save sheetjsw.xlsx")
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/* return filename */
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return ToMapleString(kv, "sheetjsw.xlsx");
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}
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