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/*
* Copyright 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "TiffIfd"
#include <img_utils/TagDefinitions.h>
#include <img_utils/TiffHelpers.h>
#include <img_utils/TiffIfd.h>
#include <img_utils/TiffWriter.h>
#include <utils/Log.h>
namespace android {
namespace img_utils {
TiffIfd::TiffIfd(uint32_t ifdId)
: mNextIfd(), mIfdId(ifdId), mStripOffsetsInitialized(false) {}
TiffIfd::~TiffIfd() {}
status_t TiffIfd::addEntry(const sp<TiffEntry>& entry) {
size_t size = mEntries.size();
if (size >= MAX_IFD_ENTRIES) {
ALOGW("%s: Failed to add entry for tag 0x%x to IFD %u, too many entries in IFD!",
__FUNCTION__, entry->getTag(), mIfdId);
return BAD_INDEX;
}
if (mEntries.add(entry) < 0) {
ALOGW("%s: Failed to add entry for tag 0x%x to ifd %u.", __FUNCTION__, entry->getTag(),
mIfdId);
return BAD_INDEX;
}
return OK;
}
sp<TiffEntry> TiffIfd::getEntry(uint16_t tag) const {
ssize_t index = mEntries.indexOfTag(tag);
if (index < 0) {
ALOGW("%s: No entry for tag 0x%x in ifd %u.", __FUNCTION__, tag, mIfdId);
return NULL;
}
return mEntries[index];
}
void TiffIfd::removeEntry(uint16_t tag) {
ssize_t index = mEntries.indexOfTag(tag);
if (index >= 0) {
mEntries.removeAt(index);
}
}
void TiffIfd::setNextIfd(const sp<TiffIfd>& ifd) {
mNextIfd = ifd;
}
sp<TiffIfd> TiffIfd::getNextIfd() const {
return mNextIfd;
}
uint32_t TiffIfd::checkAndGetOffset(uint32_t offset) const {
size_t size = mEntries.size();
if (size > MAX_IFD_ENTRIES) {
ALOGW("%s: Could not calculate IFD offsets, IFD %u contains too many entries.",
__FUNCTION__, mIfdId);
return BAD_OFFSET;
}
if (size <= 0) {
ALOGW("%s: Could not calculate IFD offsets, IFD %u contains no entries.", __FUNCTION__,
mIfdId);
return BAD_OFFSET;
}
if (offset == BAD_OFFSET) {
ALOGW("%s: Could not calculate IFD offsets, IFD %u had a bad initial offset.",
__FUNCTION__, mIfdId);
return BAD_OFFSET;
}
uint32_t ifdSize = calculateIfdSize(size);
WORD_ALIGN(ifdSize);
return offset + ifdSize;
}
status_t TiffIfd::writeData(uint32_t offset, /*out*/EndianOutput* out) const {
assert((offset % TIFF_WORD_SIZE) == 0);
status_t ret = OK;
ALOGV("%s: IFD %u written to offset %u", __FUNCTION__, mIfdId, offset );
uint32_t valueOffset = checkAndGetOffset(offset);
if (valueOffset == 0) {
return BAD_VALUE;
}
size_t size = mEntries.size();
// Writer IFD header (2 bytes, number of entries).
uint16_t header = static_cast<uint16_t>(size);
BAIL_ON_FAIL(out->write(&header, 0, 1), ret);
// Write tag entries
for (size_t i = 0; i < size; ++i) {
BAIL_ON_FAIL(mEntries[i]->writeTagInfo(valueOffset, out), ret);
valueOffset += mEntries[i]->getSize();
}
// Writer IFD footer (4 bytes, offset to next IFD).
uint32_t footer = (mNextIfd != NULL) ? offset + getSize() : 0;
BAIL_ON_FAIL(out->write(&footer, 0, 1), ret);
assert(out->getCurrentOffset() == offset + calculateIfdSize(size));
// Write zeroes till word aligned
ZERO_TILL_WORD(out, calculateIfdSize(size), ret);
// Write values for each tag entry
for (size_t i = 0; i < size; ++i) {
size_t last = out->getCurrentOffset();
// Only write values that are too large to fit in the 12-byte TIFF entry
if (mEntries[i]->getSize() > OFFSET_SIZE) {
BAIL_ON_FAIL(mEntries[i]->writeData(out->getCurrentOffset(), out), ret);
}
size_t next = out->getCurrentOffset();
size_t diff = (next - last);
size_t actual = mEntries[i]->getSize();
if (diff != actual) {
ALOGW("Sizes do not match for tag %x. Expected %zu, received %zu",
mEntries[i]->getTag(), actual, diff);
}
}
assert(out->getCurrentOffset() == offset + getSize());
return ret;
}
size_t TiffIfd::getSize() const {
size_t size = mEntries.size();
uint32_t total = calculateIfdSize(size);
WORD_ALIGN(total);
for (size_t i = 0; i < size; ++i) {
total += mEntries[i]->getSize();
}
return total;
}
uint32_t TiffIfd::getId() const {
return mIfdId;
}
uint32_t TiffIfd::getComparableValue() const {
return mIfdId;
}
status_t TiffIfd::validateAndSetStripTags() {
sp<TiffEntry> widthEntry = getEntry(TAG_IMAGEWIDTH);
if (widthEntry == NULL) {
ALOGE("%s: IFD %u doesn't have a ImageWidth tag set", __FUNCTION__, mIfdId);
return BAD_VALUE;
}
sp<TiffEntry> heightEntry = getEntry(TAG_IMAGELENGTH);
if (heightEntry == NULL) {
ALOGE("%s: IFD %u doesn't have a ImageLength tag set", __FUNCTION__, mIfdId);
return BAD_VALUE;
}
sp<TiffEntry> samplesEntry = getEntry(TAG_SAMPLESPERPIXEL);
if (samplesEntry == NULL) {
ALOGE("%s: IFD %u doesn't have a SamplesPerPixel tag set", __FUNCTION__, mIfdId);
return BAD_VALUE;
}
sp<TiffEntry> bitsEntry = getEntry(TAG_BITSPERSAMPLE);
if (bitsEntry == NULL) {
ALOGE("%s: IFD %u doesn't have a BitsPerSample tag set", __FUNCTION__, mIfdId);
return BAD_VALUE;
}
uint32_t width = *(widthEntry->getData<uint32_t>());
uint32_t height = *(heightEntry->getData<uint32_t>());
uint16_t bitsPerSample = *(bitsEntry->getData<uint16_t>());
uint16_t samplesPerPixel = *(samplesEntry->getData<uint16_t>());
if ((bitsPerSample % 8) != 0) {
ALOGE("%s: BitsPerSample %d in IFD %u is not byte-aligned.", __FUNCTION__,
bitsPerSample, mIfdId);
return BAD_VALUE;
}
uint32_t bytesPerSample = bitsPerSample / 8;
// Choose strip size as close to 8kb as possible without splitting rows.
// If the row length is >8kb, each strip will only contain a single row.
const uint32_t rowLengthBytes = bytesPerSample * samplesPerPixel * width;
const uint32_t idealChunkSize = (1 << 13); // 8kb
uint32_t rowsPerChunk = idealChunkSize / rowLengthBytes;
rowsPerChunk = (rowsPerChunk == 0) ? 1 : rowsPerChunk;
const uint32_t actualChunkSize = rowLengthBytes * rowsPerChunk;
const uint32_t lastChunkRows = height % rowsPerChunk;
const uint32_t lastChunkSize = lastChunkRows * rowLengthBytes;
if (actualChunkSize > /*max strip size for TIFF/EP*/65536) {
ALOGE("%s: Strip length too long.", __FUNCTION__);
return BAD_VALUE;
}
size_t numStrips = height / rowsPerChunk;
// Add another strip for the incomplete chunk.
if (lastChunkRows > 0) {
numStrips += 1;
}
// Put each row in it's own strip
uint32_t rowsPerStripVal = rowsPerChunk;
sp<TiffEntry> rowsPerStrip = TiffWriter::uncheckedBuildEntry(TAG_ROWSPERSTRIP, LONG, 1,
UNDEFINED_ENDIAN, &rowsPerStripVal);
if (rowsPerStrip == NULL) {
ALOGE("%s: Could not build entry for RowsPerStrip tag.", __FUNCTION__);
return BAD_VALUE;
}
Vector<uint32_t> byteCounts;
for (size_t i = 0; i < numStrips; ++i) {
if (lastChunkRows > 0 && i == (numStrips - 1)) {
byteCounts.add(lastChunkSize);
} else {
byteCounts.add(actualChunkSize);
}
}
// Set byte counts for each strip
sp<TiffEntry> stripByteCounts = TiffWriter::uncheckedBuildEntry(TAG_STRIPBYTECOUNTS, LONG,
static_cast<uint32_t>(numStrips), UNDEFINED_ENDIAN, byteCounts.array());
if (stripByteCounts == NULL) {
ALOGE("%s: Could not build entry for StripByteCounts tag.", __FUNCTION__);
return BAD_VALUE;
}
Vector<uint32_t> stripOffsetsVector;
stripOffsetsVector.resize(numStrips);
// Set uninitialized offsets
sp<TiffEntry> stripOffsets = TiffWriter::uncheckedBuildEntry(TAG_STRIPOFFSETS, LONG,
static_cast<uint32_t>(numStrips), UNDEFINED_ENDIAN, stripOffsetsVector.array());
if (stripOffsets == NULL) {
ALOGE("%s: Could not build entry for StripOffsets tag.", __FUNCTION__);
return BAD_VALUE;
}
if(addEntry(stripByteCounts) != OK) {
ALOGE("%s: Could not add entry for StripByteCounts to IFD %u", __FUNCTION__, mIfdId);
return BAD_VALUE;
}
if(addEntry(rowsPerStrip) != OK) {
ALOGE("%s: Could not add entry for StripByteCounts to IFD %u", __FUNCTION__, mIfdId);
return BAD_VALUE;
}
if(addEntry(stripOffsets) != OK) {
ALOGE("%s: Could not add entry for StripByteCounts to IFD %u", __FUNCTION__, mIfdId);
return BAD_VALUE;
}
mStripOffsetsInitialized = true;
return OK;
}
bool TiffIfd::uninitializedOffsets() const {
return mStripOffsetsInitialized;
}
status_t TiffIfd::setStripOffset(uint32_t offset) {
// Get old offsets and bytecounts
sp<TiffEntry> oldOffsets = getEntry(TAG_STRIPOFFSETS);
if (oldOffsets == NULL) {
ALOGE("%s: IFD %u does not contain StripOffsets entry.", __FUNCTION__, mIfdId);
return BAD_VALUE;
}
sp<TiffEntry> stripByteCounts = getEntry(TAG_STRIPBYTECOUNTS);
if (stripByteCounts == NULL) {
ALOGE("%s: IFD %u does not contain StripByteCounts entry.", __FUNCTION__, mIfdId);
return BAD_VALUE;
}
uint32_t offsetsCount = oldOffsets->getCount();
uint32_t byteCount = stripByteCounts->getCount();
if (offsetsCount != byteCount) {
ALOGE("%s: StripOffsets count (%u) doesn't match StripByteCounts count (%u) in IFD %u",
__FUNCTION__, offsetsCount, byteCount, mIfdId);
return BAD_VALUE;
}
const uint32_t* stripByteCountsArray = stripByteCounts->getData<uint32_t>();
size_t numStrips = offsetsCount;
Vector<uint32_t> stripOffsets;
// Calculate updated byte offsets
for (size_t i = 0; i < numStrips; ++i) {
stripOffsets.add(offset);
offset += stripByteCountsArray[i];
}
sp<TiffEntry> newOffsets = TiffWriter::uncheckedBuildEntry(TAG_STRIPOFFSETS, LONG,
static_cast<uint32_t>(numStrips), UNDEFINED_ENDIAN, stripOffsets.array());
if (newOffsets == NULL) {
ALOGE("%s: Coult not build updated offsets entry in IFD %u", __FUNCTION__, mIfdId);
return BAD_VALUE;
}
if (addEntry(newOffsets) != OK) {
ALOGE("%s: Failed to add updated offsets entry in IFD %u", __FUNCTION__, mIfdId);
return BAD_VALUE;
}
return OK;
}
uint32_t TiffIfd::getStripSize() const {
sp<TiffEntry> stripByteCounts = getEntry(TAG_STRIPBYTECOUNTS);
if (stripByteCounts == NULL) {
ALOGE("%s: IFD %u does not contain StripByteCounts entry.", __FUNCTION__, mIfdId);
return BAD_VALUE;
}
uint32_t count = stripByteCounts->getCount();
const uint32_t* byteCounts = stripByteCounts->getData<uint32_t>();
uint32_t total = 0;
for (size_t i = 0; i < static_cast<size_t>(count); ++i) {
total += byteCounts[i];
}
return total;
}
String8 TiffIfd::toString() const {
size_t s = mEntries.size();
String8 output;
output.appendFormat("[ifd: %x, num_entries: %zu, entries:\n", getId(), s);
for(size_t i = 0; i < mEntries.size(); ++i) {
output.append("\t");
output.append(mEntries[i]->toString());
output.append("\n");
}
output.append(", next_ifd: %x]", ((mNextIfd != NULL) ? mNextIfd->getId() : 0));
return output;
}
void TiffIfd::log() const {
size_t s = mEntries.size();
ALOGI("[ifd: %x, num_entries: %zu, entries:\n", getId(), s);
for(size_t i = 0; i < s; ++i) {
ALOGI("\t%s", mEntries[i]->toString().string());
}
ALOGI(", next_ifd: %x]", ((mNextIfd != NULL) ? mNextIfd->getId() : 0));
}
} /*namespace img_utils*/
} /*namespace android*/