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Update structure for partials and examples

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This commit is contained in:
Petr Bokoc 2022-01-13 20:42:40 +01:00
parent b1b3d6a960
commit 531ddf0721
89 changed files with 79 additions and 79 deletions
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32
modules/ROOT/examples/Java-JNI-Pointers.adoc Normal file
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JNIEXPORT jint JNICALL Java_sum
(JNIEnv *jEnv, jclass clazz, jbyteArray buffer, jint offset, jint length)
{
assert(sizeof(jint) == sizeof(unsigned));
if (offset < 0 || length < 0) {
(*jEnv)->ThrowNew(jEnv, arrayIndexOutOfBoundsExceptionClass,
"negative offset/length");
return 0;
}
unsigned uoffset = offset;
unsigned ulength = length;
// This cannot overflow because of the check above.
unsigned totallength = uoffset + ulength;
unsigned actuallength = (*jEnv)->GetArrayLength(jEnv, buffer);
if (totallength > actuallength) {
(*jEnv)->ThrowNew(jEnv, arrayIndexOutOfBoundsExceptionClass,
"offset + length too large");
return 0;
}
unsigned char *ptr = (*jEnv)->GetPrimitiveArrayCritical(jEnv, buffer, 0);
if (ptr == NULL) {
return 0;
}
unsigned long long sum = 0;
for (unsigned char *p = ptr + uoffset, *end = p + ulength; p != end; ++p) {
sum += *p;
}
(*jEnv)->ReleasePrimitiveArrayCritical(jEnv, buffer, ptr, 0);
return sum;
}