httppeer: extract code for creating a request into own function
Some of this feels awkward, such as having to pass in a function
to evaluate a capability. And this code is generally pretty difficult
to read. I didn't want to perform too much refactoring as part of
the code move since it would make review more difficult.
Differential Revision: https://phab.mercurial-scm.org/D3234
/*
* xdiff.cc - fuzzer harness for thirdparty/xdiff
*
* Copyright 2018, Google Inc.
*
* This software may be used and distributed according to the terms of
* the GNU General Public License, incorporated herein by reference.
*/
#include "thirdparty/xdiff/xdiff.h"
#include <inttypes.h>
#include <stdlib.h>
extern "C" {
int hunk_consumer(long a1, long a2, long b1, long b2, void *priv)
{
// TODO: probably also test returning -1 from this when things break?
return 0;
}
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
{
if (!Size) {
return 0;
}
// figure out a random point in [0, Size] to split our input.
size_t split = Data[0] / 255.0 * Size;
mmfile_t a, b;
// `a` input to diff is data[1:split]
a.ptr = (char *)Data + 1;
// which has len split-1
a.size = split - 1;
// `b` starts at the next byte after `a` ends
b.ptr = a.ptr + a.size;
b.size = Size - split;
xpparam_t xpp = {
XDF_INDENT_HEURISTIC, /* flags */
};
xdemitconf_t xecfg = {
XDL_EMIT_BDIFFHUNK, /* flags */
hunk_consumer, /* hunk_consume_func */
};
xdemitcb_t ecb = {
NULL, /* priv */
};
xdl_diff(&a, &b, &xpp, &xecfg, &ecb);
return 0; // Non-zero return values are reserved for future use.
}
#ifdef HG_FUZZER_INCLUDE_MAIN
int main(int argc, char **argv)
{
const char data[] = "asdf";
return LLVMFuzzerTestOneInput((const uint8_t *)data, 4);
}
#endif
} // extern "C"