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skia2/fuzz/FuzzCommon.cpp
Kevin Lubick bc9a1a837d Make fuzz::next overloads more consistent 
Some oss-fuzz bugs (like the linked one) would not reproduce
in Skia proper due to the fact that there were subtle overloads
of the various Fuzz::next() methods in FuzzCanvas.cpp that
were pulled in in Skia proper, but not oss-fuzz.

This puts all of them in to FuzzCommon.h and makes the
matrix and rrect ones opt-in (fuzz_matrix, fuzz_rrect).

Additionally, this renames fuzz.cpp -> FuzzMain.cpp so we
can properly include Fuzz.cpp in oss-fuzz without
having two mains.

Bug: oss-fuzz:10378
Change-Id: I6cf9afb471781b9fadb689482109a1e5662358b5
Reviewed-on: https://skia-review.googlesource.com/154900
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2018-09-17 19:20:51 +00:00

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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "Fuzz.h"
#include "FuzzCommon.h"
// We don't always want to test NaNs and infinities.
static void fuzz_nice_float(Fuzz* fuzz, float* f) {
float v;
fuzz->next(&v);
constexpr float kLimit = 1.0e35f; // FLT_MAX?
*f = (v == v && v <= kLimit && v >= -kLimit) ? v : 0.0f;
}
template <typename... Args>
static void fuzz_nice_float(Fuzz* fuzz, float* f, Args... rest) {
fuzz_nice_float(fuzz, f);
fuzz_nice_float(fuzz, rest...);
}
// allows some float values for path points
void FuzzPath(Fuzz* fuzz, SkPath* path, int maxOps) {
if (maxOps <= 0) {
return;
}
uint8_t fillType;
fuzz->nextRange(&fillType, 0, (uint8_t)SkPath::kInverseEvenOdd_FillType);
path->setFillType((SkPath::FillType)fillType);
uint8_t numOps;
fuzz->nextRange(&numOps, 0, maxOps);
for (uint8_t i = 0; i < numOps; ++i) {
uint8_t op;
fuzz->nextRange(&op, 0, 32);
bool test;
SkPath p;
SkMatrix m;
SkRRect rr;
SkRect r;
SkPath::Direction dir;
unsigned int ui;
SkScalar a, b, c, d, e, f;
switch (op) {
case 0:
fuzz_nice_float(fuzz, &a, &b);
path->moveTo(a, b);
break;
case 1:
fuzz_nice_float(fuzz, &a, &b);
path->rMoveTo(a, b);
break;
case 2:
fuzz_nice_float(fuzz, &a, &b);
path->lineTo(a, b);
break;
case 3:
fuzz_nice_float(fuzz, &a, &b);
path->rLineTo(a, b);
break;
case 4:
fuzz_nice_float(fuzz, &a, &b, &c, &d);
path->quadTo(a, b, c, d);
break;
case 5:
fuzz_nice_float(fuzz, &a, &b, &c, &d);
path->rQuadTo(a, b, c, d);
break;
case 6:
fuzz_nice_float(fuzz, &a, &b, &c, &d, &e);
path->conicTo(a, b, c, d, e);
break;
case 7:
fuzz_nice_float(fuzz, &a, &b, &c, &d, &e);
path->rConicTo(a, b, c, d, e);
break;
case 8:
fuzz_nice_float(fuzz, &a, &b, &c, &d, &e, &f);
path->cubicTo(a, b, c, d, e, f);
break;
case 9:
fuzz_nice_float(fuzz, &a, &b, &c, &d, &e, &f);
path->rCubicTo(a, b, c, d, e, f);
break;
case 10:
fuzz_nice_float(fuzz, &a, &b, &c, &d, &e);
path->arcTo(a, b, c, d, e);
break;
case 11:
fuzz_nice_float(fuzz, &a, &b);
fuzz->next(&r, &test);
path->arcTo(r, a, b, test);
break;
case 12:
path->close();
break;
case 13:
fuzz->next(&r);
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPath::Direction>(ui);
path->addRect(r, dir);
break;
case 14:
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPath::Direction>(ui);
fuzz->next(&r, &ui);
path->addRect(r, dir, ui);
break;
case 15:
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPath::Direction>(ui);
fuzz->next(&r);
path->addOval(r, dir);
break;
case 16:
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPath::Direction>(ui);
fuzz->next(&r, &ui);
path->addOval(r, dir, ui);
break;
case 17:
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPath::Direction>(ui);
fuzz_nice_float(fuzz, &a, &b, &c);
path->addCircle(a, b, c, dir);
break;
case 18:
fuzz->next(&r);
fuzz_nice_float(fuzz, &a, &b);
path->addArc(r, a, b);
break;
case 19:
fuzz_nice_float(fuzz, &a, &b);
fuzz->next(&r);
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPath::Direction>(ui);
path->addRoundRect(r, a, b, dir);
break;
case 20:
fuzz->next(&rr);
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPath::Direction>(ui);
path->addRRect(rr, dir);
break;
case 21:
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPath::Direction>(ui);
fuzz->next(&rr, &ui);
path->addRRect(rr, dir, ui);
break;
case 22: {
fuzz->nextRange(&ui, 0, 1);
SkPath::AddPathMode mode = static_cast<SkPath::AddPathMode>(ui);
fuzz->next(&m);
FuzzPath(fuzz, &p, maxOps-1);
path->addPath(p, m, mode);
break;
}
case 23: {
fuzz->nextRange(&ui, 0, 1);
SkPath::AddPathMode mode = static_cast<SkPath::AddPathMode>(ui);
fuzz->next(&m);
path->addPath(*path, m, mode);
break;
}
case 24:
FuzzPath(fuzz, &p, maxOps-1);
path->reverseAddPath(p);
break;
case 25:
path->addPath(*path);
break;
case 26:
path->reverseAddPath(*path);
break;
case 27:
fuzz_nice_float(fuzz, &a, &b);
path->offset(a, b, path);
break;
case 28:
FuzzPath(fuzz, &p, maxOps-1);
fuzz_nice_float(fuzz, &a, &b);
p.offset(a, b, path);
break;
case 29:
fuzz->next(&m);
path->transform(m, path);
break;
case 30:
FuzzPath(fuzz, &p, maxOps-1);
fuzz->next(&m);
p.transform(m, path);
break;
case 31:
fuzz_nice_float(fuzz, &a, &b);
path->setLastPt(a, b);
break;
case 32:
path->shrinkToFit();
break;
default:
SkASSERT(false);
break;
}
}
}
// allows all float values for path points
void BuildPath(Fuzz* fuzz, SkPath* path, int last_verb) {
while (!fuzz->exhausted()) {
// Use a uint8_t to conserve bytes. This makes our "fuzzed bytes footprint"
// smaller, which leads to more efficient fuzzing.
uint8_t operation;
fuzz->next(&operation);
SkScalar a,b,c,d,e,f;
switch (operation % (last_verb + 1)) {
case SkPath::Verb::kMove_Verb:
fuzz->next(&a, &b);
path->moveTo(a, b);
break;
case SkPath::Verb::kLine_Verb:
fuzz->next(&a, &b);
path->lineTo(a, b);
break;
case SkPath::Verb::kQuad_Verb:
fuzz->next(&a, &b, &c, &d);
path->quadTo(a, b, c, d);
break;
case SkPath::Verb::kConic_Verb:
fuzz->next(&a, &b, &c, &d, &e);
path->conicTo(a, b, c, d, e);
break;
case SkPath::Verb::kCubic_Verb:
fuzz->next(&a, &b, &c, &d, &e, &f);
path->cubicTo(a, b, c, d, e, f);
break;
case SkPath::Verb::kClose_Verb:
path->close();
break;
case SkPath::Verb::kDone_Verb:
// In this case, simply exit.
return;
}
}
}
void FuzzNiceRRect(Fuzz* fuzz, SkRRect* rr) {
SkRect r;
SkVector radii[4];
fuzz->next(&r);
r.sort();
for (SkVector& vec : radii) {
fuzz->nextRange(&vec.fX, 0.0f, 1.0f);
vec.fX *= 0.5f * r.width();
fuzz->nextRange(&vec.fY, 0.0f, 1.0f);
vec.fY *= 0.5f * r.height();
}
rr->setRectRadii(r, radii);
}
void FuzzNiceMatrix(Fuzz* fuzz, SkMatrix* m) {
constexpr int kArrayLength = 9;
SkScalar buffer[kArrayLength];
int matrixType;
fuzz->nextRange(&matrixType, 0, 4);
switch (matrixType) {
case 0: // identity
*m = SkMatrix::I();
return;
case 1: // translate
fuzz->nextRange(&buffer[0], -4000.0f, 4000.0f);
fuzz->nextRange(&buffer[1], -4000.0f, 4000.0f);
*m = SkMatrix::MakeTrans(buffer[0], buffer[1]);
return;
case 2: // translate + scale
fuzz->nextRange(&buffer[0], -400.0f, 400.0f);
fuzz->nextRange(&buffer[1], -400.0f, 400.0f);
fuzz->nextRange(&buffer[2], -4000.0f, 4000.0f);
fuzz->nextRange(&buffer[3], -4000.0f, 4000.0f);
*m = SkMatrix::MakeScale(buffer[0], buffer[1]);
m->postTranslate(buffer[2], buffer[3]);
return;
case 3: // affine
fuzz->nextN(buffer, 6);
m->setAffine(buffer);
return;
case 4: // perspective
fuzz->nextN(buffer, kArrayLength);
m->set9(buffer);
return;
default:
SkASSERT(false);
return;
}
}
void FuzzNiceRegion(Fuzz* fuzz, SkRegion* region, int maxN) {
uint8_t N;
fuzz->nextRange(&N, 0, maxN);
for (uint8_t i = 0; i < N; ++i) {
SkIRect r;
SkRegion::Op op;
// Avoid the sentinal value used by Region.
fuzz->nextRange(&r.fLeft, -2147483646, 2147483646);
fuzz->nextRange(&r.fTop, -2147483646, 2147483646);
fuzz->nextRange(&r.fRight, -2147483646, 2147483646);
fuzz->nextRange(&r.fBottom, -2147483646, 2147483646);
r.sort();
fuzz->nextEnum(&op, 0, SkRegion::kLastOp);
if (!region->op(r, op)) {
return;
}
}
}
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