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// Copyright 2017 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#include <memory.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
char dst[1024*1024*2+64] = {};
char src[1024*1024*2+64] = {};
#define GUARDSIZE 32
void test_memcpy(int copySize, int srcOffset, int dstOffset) {
char *dstContent = dst + GUARDSIZE + dstOffset;
char *srcContent = src + GUARDSIZE + srcOffset;
char *dstGuardBefore = dstContent - GUARDSIZE;
char *dstGuardAfter = dstContent + copySize;
char *srcGuardBefore = srcContent - GUARDSIZE;
char *srcGuardAfter = srcContent + copySize;
char guard = (char)rand();
for (int i = 0; i < GUARDSIZE; ++i) {
// Generate a guardband area around dst memory that should not change.
dstGuardBefore[i] = (char)(guard ^ i);
dstGuardAfter[i] = (char)(guard ^ i);
}
// Generate copy source data
char s = (char)rand();
for (int i = 0; i < copySize + srcOffset + 2*GUARDSIZE; ++i) {
src[i] = (char)(s - i);
}
memcpy(dstContent, srcContent, copySize);
if (!!memcmp(dstContent, srcContent, copySize)) {
printf("test_memcpy(copySize=%d, srcOffset=%d, dstOffset=%d failed!\n", copySize, srcOffset, dstOffset);
exit(1);
}
// Verify guardband area
for (int i = 0; i < GUARDSIZE; ++i) {
// Generate a guardband area around dst memory that should not change.
if (dstGuardBefore[i] != (char)(guard ^ i)) {
printf("test_memcpy(copySize=%d, srcOffset=%d, dstOffset=%d failed! Pre-guardband area at i=%d overwritten!\n", copySize, srcOffset, dstOffset, i);
exit(1);
}
if (dstGuardAfter[i] != (char)(guard ^ i)) {
printf("test_memcpy(copySize=%d, srcOffset=%d, dstOffset=%d failed! Post-guardband area at i=%d overwritten!\n", copySize, srcOffset, dstOffset, i);
exit(1);
}
}
}
void test_copysize(int copySize) {
int offsets[6] = { 0, 3, 4, 5, 8, 11 };
for (int srcOffset = 0; srcOffset < 6; ++srcOffset) {
for (int dstOffset = 0; dstOffset < 6; ++dstOffset) {
test_memcpy(copySize, offsets[srcOffset], offsets[dstOffset]);
}
}
}
int main() {
for (int copySize = 0; copySize < 128; ++copySize) {
test_copysize(copySize);
}
for (int copySizeI = 128; copySizeI <= 1048576; copySizeI <<= 1) {
for (int copySizeJ = 1; copySizeJ <= 16; copySizeJ <<= 1) {
test_copysize(copySizeI | copySizeJ);
}
}
printf("OK.\n");
}
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