118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "mujs.h"
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/* -------------------- */
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/* these helper functions are from the official repl example */
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static void jsB_print(js_State *J) {
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int i = 1, top = js_gettop(J);
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for (; i < top; ++i) {
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const char *s = js_tostring(J, i);
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if (i > 1) putchar(' ');
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/* note: the official example uses `fputs`, but `puts` makes more sense */
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puts(s);
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}
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putchar('\n');
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js_pushundefined(J);
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}
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static void report(js_State *J, const char *msg) { fprintf(stderr, "REPORT MSG: %s\n", msg); }
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/* -------------------- */
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/* base64 encoder */
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const char Base64_map[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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static int Base64_encode(char *dst, const char *src, int len) {
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unsigned char c1 = 0, c2 = 0, c3 = 0;
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char *p = dst;
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size_t i = 0;
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for(; i < len;) {
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c1 = src[i++];
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*p++ = Base64_map[(c1 >> 2)];
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c2 = src[i++];
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*p++ = Base64_map[((c1 & 3) << 4) | (c2 >> 4)];
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c3 = src[i++];
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*p++ = Base64_map[((c2 & 15) << 2) | (c3 >> 6)];
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*p++ = Base64_map[c3 & 0x3F];
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}
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if(i < len) {
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c1 = src[i++];
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*p++ = Base64_map[(c1 >> 2)];
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if(i == len) {
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*p++ = Base64_map[(c1 & 3) << 4];
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*p++ = '=';
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} else {
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c2 = src[i++];
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*p++ = Base64_map[((c1 & 3) << 4) | (c2 >> 4)];
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*p++ = Base64_map[(c2 & 15) << 2];
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}
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*p++ = '=';
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}
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*p++ = '\0';
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return p - dst;
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}
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/* -------------------- */
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/* read file from filesystem */
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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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/* -------------------- */
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int main(int argc, char **argv) {
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/* initialize mujs */
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js_State *J = js_newstate(NULL, NULL, 0);
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js_setreport(J, report);
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/* create `console.log` */
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js_newcfunction(J, jsB_print, "print", 0);
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js_setglobal(J, "print");
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js_dostring(J, "var console = { log: print };");
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/* create `global` variable */
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js_dostring(J, "var global = (function() { return this; })(null);");
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/* load scripts */
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js_dofile(J, "shim.min.js");
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js_dofile(J, "xlsx.full.min.js");
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/* read file */
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size_t dlen; char *dbuf = read_file(argv[1], &dlen);
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/* base64 encode the file */
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int sz = ((dlen + 2) / 3) * 4 + 1;
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char *b64 = malloc(sz+1);
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sz = Base64_encode(b64, dbuf, dlen);
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/* create `buf` global from the data */
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js_pushlstring(J, b64, sz);
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js_setglobal(J, "buf");
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/* parse file */
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js_dostring(J, "var wb = XLSX.read(buf, {type: 'base64'});");
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/* print CSV from first worksheet */
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js_dostring(J, "var ws = wb.Sheets[wb.SheetNames[0]]");
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js_dostring(J, "console.log(XLSX.utils.sheet_to_csv(ws));");
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/* cleanup */
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free(b64);
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js_freestate(J);
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return 0;
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} |