improve browser.test_split_memory_large_file

tests/split_memory_large_file.cpp

@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <stdint.h>
+
+#include <emscripten.h>
+
+#define TOTAL_SIZE (4*1024*1024)
+
+int main() {
+  unsigned char temp;
+
+  printf("open file\n");
+  FILE *f = fopen("huge.dat", "r");
+  assert(f);
+  unsigned i;
+  for (i = 0; i < TOTAL_SIZE; i++) {
+    int ret = fseek(f, i, SEEK_SET);
+    assert(ret == 0);
+    int num = fread(&temp, 1, 1, f);
+    assert(num == 1);
+    unsigned char expected = (i*i)&255;
+    if (temp != expected) {
+      printf("%d: see %d != %d was expected :(\n", i, temp, expected);
+      abort();
+    }
+    if ((i & (1024*1024-1)) == 0) printf("%d of %d ..\n", i, TOTAL_SIZE);
+  }
+  printf("%d all ok.\n", i);
+  int result = 1;
+  REPORT_RESULT();
+}
+

tests/test_browser.py

@@ -2912,6 +2912,7 @@ window.close = function() {
       self.btest('in_flight_memfile_request.c', expected='0' if o < 2 else '1', args=opts) # should happen when there is a mem init file (-O2+)
 
   def test_split_memory_large_file(self):
-    open('huge.dat', 'w').write('a'*(1024*1024*25)) # larger than a memory chunk
-    self.btest('browser_test_hello_world.c', expected='0', args=['-s', 'SPLIT_MEMORY=8388608', '-s', 'TOTAL_MEMORY=100000000', '--preload-file', 'huge.dat'])
+    size = 2*1024*1024
+    open('huge.dat', 'w').write(''.join([chr((x*x)&255) for x in range(size*2)])) # larger than a memory chunk
+    self.btest('split_memory_large_file.cpp', expected='1', args=['-s', 'SPLIT_MEMORY=' + str(size), '-s', 'TOTAL_MEMORY=100000000', '-s', 'TOTAL_STACK=10240', '--preload-file', 'huge.dat'])