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| 1 /* |
| 2 * Copyright 2016 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #include "SkMultiPictureDocumentPriv.h" |
| 9 #include "SkMultiPictureDocumentReader.h" |
| 10 #include "SkPicture.h" |
| 11 #include "SkStream.h" |
| 12 |
| 13 bool SkMultiPictureDocumentReader::init(SkStreamSeekable* stream) { |
| 14 if (!stream) { |
| 15 return false; |
| 16 } |
| 17 stream->seek(0); |
| 18 const size_t size = sizeof(SkMultiPictureDocumentProtocol::kMagic) - 1; |
| 19 char buffer[size]; |
| 20 if (size != stream->read(buffer, size) || |
| 21 0 != memcmp(SkMultiPictureDocumentProtocol::kMagic, buffer, size)) { |
| 22 stream = nullptr; |
| 23 return false; |
| 24 } |
| 25 bool good = true; |
| 26 uint32_t versionNumber = stream->readU32(); |
| 27 if (versionNumber != 1) { |
| 28 return false; |
| 29 } |
| 30 uint32_t pageCount = stream->readU32(); |
| 31 fSizes.reset(pageCount); |
| 32 fOffsets.reset(pageCount); |
| 33 for (uint32_t i = 0; i < pageCount; ++i) { |
| 34 SkMultiPictureDocumentProtocol::Entry entry; |
| 35 good &= sizeof(entry) == stream->read(&entry, sizeof(entry)); |
| 36 fSizes[i] = SkSize::Make(entry.sizeX, entry.sizeY); |
| 37 good &= SkTFitsIn<size_t>(entry.offset); |
| 38 fOffsets[i] = static_cast<size_t>(entry.offset); |
| 39 } |
| 40 return good; |
| 41 } |
| 42 |
| 43 sk_sp<SkPicture> SkMultiPictureDocumentReader::readPage(SkStreamSeekable* stream
, |
| 44 int pageNumber) const { |
| 45 SkASSERT(pageNumber >= 0); |
| 46 SkASSERT(pageNumber < fOffsets.count()); |
| 47 SkAssertResult(stream->seek(fOffsets[pageNumber])); |
| 48 return SkPicture::MakeFromStream(stream); |
| 49 } |
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