diff options
author | 2015-05-21 08:13:27 -0700 | |
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committer | 2015-05-21 08:13:27 -0700 | |
commit | e797d0de67a5dd4b7b0b66dbb8b33be46b74240e (patch) | |
tree | c1e8df2fcae14ab3ca2a09725c3c55a4ade798db /src/core/SkStream.cpp | |
parent | fb5df43af87e77beeb7ca0759678f0cc95a8c6da (diff) |
SkBlockMemoryStream implements peek()
Review URL: https://codereview.chromium.org/1146903004
Diffstat (limited to 'src/core/SkStream.cpp')
-rw-r--r-- | src/core/SkStream.cpp | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/core/SkStream.cpp b/src/core/SkStream.cpp index ad67a0ba7d..ac73adbce5 100644 --- a/src/core/SkStream.cpp +++ b/src/core/SkStream.cpp @@ -724,6 +724,27 @@ public: return fOffset == fSize; } + bool peek(void* buff, size_t size) const override { + SkASSERT(buff != NULL); + if (fOffset + size > fSize) { + return false; + } + char* buffer = static_cast<char*>(buff); + const SkDynamicMemoryWStream::Block* current = fCurrent; + size_t currentOffset = fCurrentOffset; + while (size) { + SkASSERT(current); + size_t bytesFromCurrent = + SkTMin(current->written() - currentOffset, size); + memcpy(buffer, current->start() + currentOffset, bytesFromCurrent); + size -= bytesFromCurrent; + buffer += bytesFromCurrent; + current = current->fNext; + currentOffset = 0; + } + return true; + } + bool rewind() override { fCurrent = fBlockMemory->fHead; fOffset = 0; |