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skia2/tests/CodexTest.cpp
msarett e6dd004c1b Fill incomplete images in SkCodec parent class 
Rather than implementing some sort of "fill" in every
SkCodec subclass for incomplete images, let's make the
parent class handle this situation.

This includes an API change to SkCodec.h

SkCodec::getScanlines() now returns the number of lines it
read successfully, rather than an SkCodec::Result enum.
getScanlines() most often fails on an incomplete input, in
which case it is useful to know how many lines were
successfully decoded - this provides more information than
kIncomplete vs kSuccess.  We do lose information when the
API is used improperly, as we are no longer able to return
kInvalidParameter or kScanlineNotStarted.

Known Issues:
Does not work for incomplete fFrameIsSubset gifs.
Does not work for incomplete icos.

BUG=skia:

Review URL: https://codereview.chromium.org/1332053002
2015-10-09 11:07:34 -07:00

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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "Resources.h"
#include "SkBitmap.h"
#include "SkCodec.h"
#include "SkData.h"
#include "SkMD5.h"
#include "SkRandom.h"
#include "SkScaledCodec.h"
#include "Test.h"
static SkStreamAsset* resource(const char path[]) {
SkString fullPath = GetResourcePath(path);
return SkStream::NewFromFile(fullPath.c_str());
}
static void md5(const SkBitmap& bm, SkMD5::Digest* digest) {
SkAutoLockPixels autoLockPixels(bm);
SkASSERT(bm.getPixels());
SkMD5 md5;
size_t rowLen = bm.info().bytesPerPixel() * bm.width();
for (int y = 0; y < bm.height(); ++y) {
md5.update(static_cast<uint8_t*>(bm.getAddr(0, y)), rowLen);
}
md5.finish(*digest);
}
/**
* Compute the digest for bm and compare it to a known good digest.
* @param r Reporter to assert that bm's digest matches goodDigest.
* @param goodDigest The known good digest to compare to.
* @param bm The bitmap to test.
*/
static void compare_to_good_digest(skiatest::Reporter* r, const SkMD5::Digest& goodDigest,
const SkBitmap& bm) {
SkMD5::Digest digest;
md5(bm, &digest);
REPORTER_ASSERT(r, digest == goodDigest);
}
/**
* Test decoding an SkCodec to a particular SkImageInfo.
*
* Calling getPixels(info) should return expectedResult, and if goodDigest is non nullptr,
* the resulting decode should match.
*/
static void test_info(skiatest::Reporter* r, SkCodec* codec, const SkImageInfo& info,
SkCodec::Result expectedResult, const SkMD5::Digest* goodDigest) {
SkBitmap bm;
bm.allocPixels(info);
SkAutoLockPixels autoLockPixels(bm);
SkCodec::Result result = codec->getPixels(info, bm.getPixels(), bm.rowBytes());
REPORTER_ASSERT(r, result == expectedResult);
if (goodDigest) {
compare_to_good_digest(r, *goodDigest, bm);
}
}
SkIRect generate_random_subset(SkRandom* rand, int w, int h) {
SkIRect rect;
do {
rect.fLeft = rand->nextRangeU(0, w);
rect.fTop = rand->nextRangeU(0, h);
rect.fRight = rand->nextRangeU(0, w);
rect.fBottom = rand->nextRangeU(0, h);
rect.sort();
} while (rect.isEmpty());
return rect;
}
static void test_codec(skiatest::Reporter* r, SkCodec* codec, SkBitmap& bm, const SkImageInfo& info,
const SkISize& size, bool supports565, SkCodec::Result expectedResult,
SkMD5::Digest* digest, const SkMD5::Digest* goodDigest) {
REPORTER_ASSERT(r, info.dimensions() == size);
bm.allocPixels(info);
SkAutoLockPixels autoLockPixels(bm);
SkCodec::Result result = codec->getPixels(info, bm.getPixels(), bm.rowBytes());
REPORTER_ASSERT(r, result == expectedResult);
md5(bm, digest);
if (goodDigest) {
REPORTER_ASSERT(r, *digest == *goodDigest);
}
{
// Test decoding to 565
SkImageInfo info565 = info.makeColorType(kRGB_565_SkColorType);
SkCodec::Result expected565 = (supports565 && info.alphaType() == kOpaque_SkAlphaType) ?
expectedResult : SkCodec::kInvalidConversion;
test_info(r, codec, info565, expected565, nullptr);
}
// Verify that re-decoding gives the same result. It is interesting to check this after
// a decode to 565, since choosing to decode to 565 may result in some of the decode
// options being modified. These options should return to their defaults on another
// decode to kN32, so the new digest should match the old digest.
test_info(r, codec, info, expectedResult, digest);
{
// Check alpha type conversions
if (info.alphaType() == kOpaque_SkAlphaType) {
test_info(r, codec, info.makeAlphaType(kUnpremul_SkAlphaType),
SkCodec::kInvalidConversion, nullptr);
test_info(r, codec, info.makeAlphaType(kPremul_SkAlphaType),
SkCodec::kInvalidConversion, nullptr);
} else {
// Decoding to opaque should fail
test_info(r, codec, info.makeAlphaType(kOpaque_SkAlphaType),
SkCodec::kInvalidConversion, nullptr);
SkAlphaType otherAt = info.alphaType();
if (kPremul_SkAlphaType == otherAt) {
otherAt = kUnpremul_SkAlphaType;
} else {
otherAt = kPremul_SkAlphaType;
}
// The other non-opaque alpha type should always succeed, but not match.
test_info(r, codec, info.makeAlphaType(otherAt), expectedResult, nullptr);
}
}
}
// FIXME: SkScaledCodec is currently only supported for types used by BRD
// skbug.com/4428
static bool supports_scaled_codec(const char path[]) {
static const char* const exts[] = {
"jpg", "jpeg", "png", "webp"
"JPG", "JPEG", "PNG", "WEBP"
};
for (uint32_t i = 0; i < SK_ARRAY_COUNT(exts); i++) {
if (SkStrEndsWith(path, exts[i])) {
return true;
}
}
return false;
}
static void check(skiatest::Reporter* r,
const char path[],
SkISize size,
bool supportsScanlineDecoding,
bool supportsSubsetDecoding,
bool supports565 = true,
bool supportsIncomplete = true) {
SkAutoTDelete<SkStream> stream(resource(path));
if (!stream) {
SkDebugf("Missing resource '%s'\n", path);
return;
}
SkAutoTDelete<SkCodec> codec(nullptr);
bool isIncomplete = supportsIncomplete;
if (isIncomplete) {
size_t size = stream->getLength();
SkAutoTUnref<SkData> data((SkData::NewFromStream(stream, 2 * size / 3)));
codec.reset(SkCodec::NewFromData(data));
} else {
codec.reset(SkCodec::NewFromStream(stream.detach()));
}
if (!codec) {
ERRORF(r, "Unable to decode '%s'", path);
return;
}
// Test full image decodes with SkCodec
SkMD5::Digest codecDigest;
SkImageInfo info = codec->getInfo().makeColorType(kN32_SkColorType);
SkBitmap bm;
SkCodec::Result expectedResult = isIncomplete ? SkCodec::kIncompleteInput : SkCodec::kSuccess;
test_codec(r, codec, bm, info, size, supports565, expectedResult, &codecDigest, nullptr);
// Scanline decoding follows.
// Need to call startScanlineDecode() first.
REPORTER_ASSERT(r, codec->getScanlines(bm.getAddr(0, 0), 1, 0)
== 0);
REPORTER_ASSERT(r, codec->skipScanlines(1)
== 0);
const SkCodec::Result startResult = codec->startScanlineDecode(info);
if (supportsScanlineDecoding) {
bm.eraseColor(SK_ColorYELLOW);
REPORTER_ASSERT(r, startResult == SkCodec::kSuccess);
for (int y = 0; y < info.height(); y++) {
const int lines = codec->getScanlines(bm.getAddr(0, y), 1, 0);
if (!isIncomplete) {
REPORTER_ASSERT(r, 1 == lines);
}
}
// verify that scanline decoding gives the same result.
if (SkCodec::kTopDown_SkScanlineOrder == codec->getScanlineOrder()) {
compare_to_good_digest(r, codecDigest, bm);
}
// Cannot continue to decode scanlines beyond the end
REPORTER_ASSERT(r, codec->getScanlines(bm.getAddr(0, 0), 1, 0)
== 0);
// Interrupting a scanline decode with a full decode starts from
// scratch
REPORTER_ASSERT(r, codec->startScanlineDecode(info) == SkCodec::kSuccess);
const int lines = codec->getScanlines(bm.getAddr(0, 0), 1, 0);
if (!isIncomplete) {
REPORTER_ASSERT(r, lines == 1);
}
REPORTER_ASSERT(r, codec->getPixels(bm.info(), bm.getPixels(), bm.rowBytes())
== expectedResult);
REPORTER_ASSERT(r, codec->getScanlines(bm.getAddr(0, 0), 1, 0)
== 0);
REPORTER_ASSERT(r, codec->skipScanlines(1)
== 0);
} else {
REPORTER_ASSERT(r, startResult == SkCodec::kUnimplemented);
}
// The rest of this function tests decoding subsets, and will decode an arbitrary number of
// random subsets.
// Do not attempt to decode subsets of an image of only once pixel, since there is no
// meaningful subset.
if (size.width() * size.height() == 1) {
return;
}
SkRandom rand;
SkIRect subset;
SkCodec::Options opts;
opts.fSubset = &subset;
for (int i = 0; i < 5; i++) {
subset = generate_random_subset(&rand, size.width(), size.height());
SkASSERT(!subset.isEmpty());
const bool supported = codec->getValidSubset(&subset);
REPORTER_ASSERT(r, supported == supportsSubsetDecoding);
SkImageInfo subsetInfo = info.makeWH(subset.width(), subset.height());
SkBitmap bm;
bm.allocPixels(subsetInfo);
const SkCodec::Result result = codec->getPixels(bm.info(), bm.getPixels(), bm.rowBytes(),
&opts, nullptr, nullptr);
if (supportsSubsetDecoding) {
REPORTER_ASSERT(r, result == expectedResult);
// Webp is the only codec that supports subsets, and it will have modified the subset
// to have even left/top.
REPORTER_ASSERT(r, SkIsAlign2(subset.fLeft) && SkIsAlign2(subset.fTop));
} else {
// No subsets will work.
REPORTER_ASSERT(r, result == SkCodec::kUnimplemented);
}
}
// SkScaledCodec tests
if ((supportsScanlineDecoding || supportsSubsetDecoding) && supports_scaled_codec(path)) {
SkAutoTDelete<SkStream> stream(resource(path));
if (!stream) {
SkDebugf("Missing resource '%s'\n", path);
return;
}
SkAutoTDelete<SkCodec> codec(nullptr);
if (isIncomplete) {
size_t size = stream->getLength();
SkAutoTUnref<SkData> data((SkData::NewFromStream(stream, 2 * size / 3)));
codec.reset(SkScaledCodec::NewFromData(data));
} else {
codec.reset(SkScaledCodec::NewFromStream(stream.detach()));
}
if (!codec) {
ERRORF(r, "Unable to decode '%s'", path);
return;
}
SkBitmap bm;
SkMD5::Digest scaledCodecDigest;
test_codec(r, codec, bm, info, size, supports565, expectedResult, &scaledCodecDigest,
&codecDigest);
}
// If we've just tested incomplete decodes, let's run the same test again on full decodes.
if (isIncomplete) {
check(r, path, size, supportsScanlineDecoding, supportsSubsetDecoding, supports565, false);
}
}
DEF_TEST(Codec, r) {
// WBMP
check(r, "mandrill.wbmp", SkISize::Make(512, 512), true, false);
// WEBP
check(r, "baby_tux.webp", SkISize::Make(386, 395), false, true);
check(r, "color_wheel.webp", SkISize::Make(128, 128), false, true);
check(r, "yellow_rose.webp", SkISize::Make(400, 301), false, true);
// BMP
check(r, "randPixels.bmp", SkISize::Make(8, 8), true, false);
// ICO
// FIXME: We are not ready to test incomplete ICOs
// These two tests examine interestingly different behavior:
// Decodes an embedded BMP image
check(r, "color_wheel.ico", SkISize::Make(128, 128), false, false, true, false);
// Decodes an embedded PNG image
check(r, "google_chrome.ico", SkISize::Make(256, 256), false, false, true, false);
// GIF
// FIXME: We are not ready to test incomplete GIFs
check(r, "box.gif", SkISize::Make(200, 55), true, false, true, false);
check(r, "color_wheel.gif", SkISize::Make(128, 128), true, false, true, false);
// randPixels.gif is too small to test incomplete
check(r, "randPixels.gif", SkISize::Make(8, 8), true, false, true, false);
// JPG
check(r, "CMYK.jpg", SkISize::Make(642, 516), true, false, false);
check(r, "color_wheel.jpg", SkISize::Make(128, 128), true, false);
// grayscale.jpg is too small to test incomplete
check(r, "grayscale.jpg", SkISize::Make(128, 128), true, false, true, false);
check(r, "mandrill_512_q075.jpg", SkISize::Make(512, 512), true, false);
// randPixels.jpg is too small to test incomplete
check(r, "randPixels.jpg", SkISize::Make(8, 8), true, false, true, false);
// PNG
check(r, "arrow.png", SkISize::Make(187, 312), true, false, true, false);
check(r, "baby_tux.png", SkISize::Make(240, 246), true, false, true, false);
check(r, "color_wheel.png", SkISize::Make(128, 128), true, false, true, false);
check(r, "half-transparent-white-pixel.png", SkISize::Make(1, 1), true, false, true, false);
check(r, "mandrill_128.png", SkISize::Make(128, 128), true, false, true, false);
check(r, "mandrill_16.png", SkISize::Make(16, 16), true, false, true, false);
check(r, "mandrill_256.png", SkISize::Make(256, 256), true, false, true, false);
check(r, "mandrill_32.png", SkISize::Make(32, 32), true, false, true, false);
check(r, "mandrill_512.png", SkISize::Make(512, 512), true, false, true, false);
check(r, "mandrill_64.png", SkISize::Make(64, 64), true, false, true, false);
check(r, "plane.png", SkISize::Make(250, 126), true, false, true, false);
// FIXME: We are not ready to test incomplete interlaced pngs
check(r, "plane_interlaced.png", SkISize::Make(250, 126), true, false, true, false);
check(r, "randPixels.png", SkISize::Make(8, 8), true, false, true, false);
check(r, "yellow_rose.png", SkISize::Make(400, 301), true, false, true, false);
}
// Test interlaced PNG in stripes, similar to DM's kStripe_Mode
DEF_TEST(Codec_stripes, r) {
const char * path = "plane_interlaced.png";
SkAutoTDelete<SkStream> stream(resource(path));
if (!stream) {
SkDebugf("Missing resource '%s'\n", path);
}
SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(stream.detach()));
REPORTER_ASSERT(r, codec);
if (!codec) {
return;
}
switch (codec->getScanlineOrder()) {
case SkCodec::kBottomUp_SkScanlineOrder:
case SkCodec::kOutOfOrder_SkScanlineOrder:
ERRORF(r, "This scanline order will not match the original.");
return;
default:
break;
}
// Baseline for what the image should look like, using N32.
const SkImageInfo info = codec->getInfo().makeColorType(kN32_SkColorType);
SkBitmap bm;
bm.allocPixels(info);
SkAutoLockPixels autoLockPixels(bm);
SkCodec::Result result = codec->getPixels(info, bm.getPixels(), bm.rowBytes());
REPORTER_ASSERT(r, result == SkCodec::kSuccess);
SkMD5::Digest digest;
md5(bm, &digest);
// Now decode in stripes
const int height = info.height();
const int numStripes = 4;
int stripeHeight;
int remainingLines;
SkTDivMod(height, numStripes, &stripeHeight, &remainingLines);
bm.eraseColor(SK_ColorYELLOW);
result = codec->startScanlineDecode(info);
REPORTER_ASSERT(r, result == SkCodec::kSuccess);
// Odd stripes
for (int i = 1; i < numStripes; i += 2) {
// Skip the even stripes
bool skipResult = codec->skipScanlines(stripeHeight);
REPORTER_ASSERT(r, skipResult);
int linesDecoded = codec->getScanlines(bm.getAddr(0, i * stripeHeight), stripeHeight,
bm.rowBytes());
REPORTER_ASSERT(r, linesDecoded == stripeHeight);
}
// Even stripes
result = codec->startScanlineDecode(info);
REPORTER_ASSERT(r, result == SkCodec::kSuccess);
for (int i = 0; i < numStripes; i += 2) {
int linesDecoded = codec->getScanlines(bm.getAddr(0, i * stripeHeight), stripeHeight,
bm.rowBytes());
REPORTER_ASSERT(r, linesDecoded == stripeHeight);
// Skip the odd stripes
if (i + 1 < numStripes) {
bool skipResult = codec->skipScanlines(stripeHeight);
REPORTER_ASSERT(r, skipResult);
}
}
// Remainder at the end
if (remainingLines > 0) {
result = codec->startScanlineDecode(info);
REPORTER_ASSERT(r, result == SkCodec::kSuccess);
bool skipResult = codec->skipScanlines(height - remainingLines);
REPORTER_ASSERT(r, skipResult);
int linesDecoded = codec->getScanlines(bm.getAddr(0, height - remainingLines),
remainingLines, bm.rowBytes());
REPORTER_ASSERT(r, linesDecoded == remainingLines);
}
compare_to_good_digest(r, digest, bm);
}
static void test_invalid_stream(skiatest::Reporter* r, const void* stream, size_t len) {
// Neither of these calls should return a codec. Bots should catch us if we leaked anything.
SkCodec* codec = SkCodec::NewFromStream(new SkMemoryStream(stream, len, false));
REPORTER_ASSERT(r, !codec);
codec = SkScaledCodec::NewFromStream(new SkMemoryStream(stream, len, false));
REPORTER_ASSERT(r, !codec);
}
// Ensure that SkCodec::NewFromStream handles freeing the passed in SkStream,
// even on failure. Test some bad streams.
DEF_TEST(Codec_leaks, r) {
// No codec should claim this as their format, so this tests SkCodec::NewFromStream.
const char nonSupportedStream[] = "hello world";
// The other strings should look like the beginning of a file type, so we'll call some
// internal version of NewFromStream, which must also delete the stream on failure.
const unsigned char emptyPng[] = { 0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a };
const unsigned char emptyJpeg[] = { 0xFF, 0xD8, 0xFF };
const char emptyWebp[] = "RIFF1234WEBPVP";
const char emptyBmp[] = { 'B', 'M' };
const char emptyIco[] = { '\x00', '\x00', '\x01', '\x00' };
const char emptyGif[] = "GIFVER";
test_invalid_stream(r, nonSupportedStream, sizeof(nonSupportedStream));
test_invalid_stream(r, emptyPng, sizeof(emptyPng));
test_invalid_stream(r, emptyJpeg, sizeof(emptyJpeg));
test_invalid_stream(r, emptyWebp, sizeof(emptyWebp));
test_invalid_stream(r, emptyBmp, sizeof(emptyBmp));
test_invalid_stream(r, emptyIco, sizeof(emptyIco));
test_invalid_stream(r, emptyGif, sizeof(emptyGif));
}
DEF_TEST(Codec_null, r) {
// Attempting to create an SkCodec or an SkScaledCodec with null should not
// crash.
SkCodec* codec = SkCodec::NewFromStream(nullptr);
REPORTER_ASSERT(r, !codec);
codec = SkScaledCodec::NewFromStream(nullptr);
REPORTER_ASSERT(r, !codec);
}
static void test_dimensions(skiatest::Reporter* r, const char path[]) {
// Create the codec from the resource file
SkAutoTDelete<SkStream> stream(resource(path));
if (!stream) {
SkDebugf("Missing resource '%s'\n", path);
return;
}
SkAutoTDelete<SkCodec> codec(SkScaledCodec::NewFromStream(stream.detach()));
if (!codec) {
ERRORF(r, "Unable to create codec '%s'", path);
return;
}
// Check that the decode is successful for a variety of scales
for (float scale = 0.05f; scale < 2.0f; scale += 0.05f) {
// Scale the output dimensions
SkISize scaledDims = codec->getScaledDimensions(scale);
SkImageInfo scaledInfo = codec->getInfo()
.makeWH(scaledDims.width(), scaledDims.height())
.makeColorType(kN32_SkColorType);
// Set up for the decode
size_t rowBytes = scaledDims.width() * sizeof(SkPMColor);
size_t totalBytes = scaledInfo.getSafeSize(rowBytes);
SkAutoTMalloc<SkPMColor> pixels(totalBytes);
SkCodec::Result result =
codec->getPixels(scaledInfo, pixels.get(), rowBytes, nullptr, nullptr, nullptr);
REPORTER_ASSERT(r, SkCodec::kSuccess == result);
}
}
// Ensure that onGetScaledDimensions returns valid image dimensions to use for decodes
DEF_TEST(Codec_Dimensions, r) {
// JPG
test_dimensions(r, "CMYK.jpg");
test_dimensions(r, "color_wheel.jpg");
test_dimensions(r, "grayscale.jpg");
test_dimensions(r, "mandrill_512_q075.jpg");
test_dimensions(r, "randPixels.jpg");
// Decoding small images with very large scaling factors is a potential
// source of bugs and crashes. We disable these tests in Gold because
// tiny images are not very useful to look at.
// Here we make sure that we do not crash or access illegal memory when
// performing scaled decodes on small images.
test_dimensions(r, "1x1.png");
test_dimensions(r, "2x2.png");
test_dimensions(r, "3x3.png");
test_dimensions(r, "3x1.png");
test_dimensions(r, "1x1.png");
test_dimensions(r, "16x1.png");
test_dimensions(r, "1x16.png");
test_dimensions(r, "mandrill_16.png");
}
static void test_invalid(skiatest::Reporter* r, const char path[]) {
SkAutoTDelete<SkStream> stream(resource(path));
if (!stream) {
SkDebugf("Missing resource '%s'\n", path);
return;
}
SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(stream.detach()));
REPORTER_ASSERT(r, nullptr == codec);
}
DEF_TEST(Codec_Empty, r) {
// Test images that should not be able to create a codec
test_invalid(r, "empty_images/zero-dims.gif");
test_invalid(r, "empty_images/zero-embedded.ico");
test_invalid(r, "empty_images/zero-width.bmp");
test_invalid(r, "empty_images/zero-height.bmp");
test_invalid(r, "empty_images/zero-width.jpg");
test_invalid(r, "empty_images/zero-height.jpg");
test_invalid(r, "empty_images/zero-width.png");
test_invalid(r, "empty_images/zero-height.png");
test_invalid(r, "empty_images/zero-width.wbmp");
test_invalid(r, "empty_images/zero-height.wbmp");
// This image is an ico with an embedded mask-bmp. This is illegal.
test_invalid(r, "invalid_images/mask-bmp-ico.ico");
}
static void test_invalid_parameters(skiatest::Reporter* r, const char path[]) {
SkAutoTDelete<SkStream> stream(resource(path));
if (!stream) {
SkDebugf("Missing resource '%s'\n", path);
return;
}
SkAutoTDelete<SkCodec> decoder(SkCodec::NewFromStream(stream.detach()));
// This should return kSuccess because kIndex8 is supported.
SkPMColor colorStorage[256];
int colorCount;
SkCodec::Result result = decoder->startScanlineDecode(
decoder->getInfo().makeColorType(kIndex_8_SkColorType), nullptr, colorStorage, &colorCount);
REPORTER_ASSERT(r, SkCodec::kSuccess == result);
// The rest of the test is uninteresting if kIndex8 is not supported
if (SkCodec::kSuccess != result) {
return;
}
// This should return kInvalidParameters because, in kIndex_8 mode, we must pass in a valid
// colorPtr and a valid colorCountPtr.
result = decoder->startScanlineDecode(
decoder->getInfo().makeColorType(kIndex_8_SkColorType), nullptr, nullptr, nullptr);
REPORTER_ASSERT(r, SkCodec::kInvalidParameters == result);
result = decoder->startScanlineDecode(
decoder->getInfo().makeColorType(kIndex_8_SkColorType));
REPORTER_ASSERT(r, SkCodec::kInvalidParameters == result);
}
DEF_TEST(Codec_Params, r) {
test_invalid_parameters(r, "index8.png");
test_invalid_parameters(r, "mandrill.wbmp");
}
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