Frédéric Wang
9b5a53b1d7
This is a first step to make WOFF2 a shared library. Public headers are moved in their own directory to make the public API clearer. This is similar to the c/include/brotli/ directory in Brotli. "using" commands are also removed from the public headers, so that callers won't have unexpected side effect when including the files.
87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
/* Copyright 2016 Google Inc. All Rights Reserved.
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Distributed under MIT license.
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See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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*/
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/* Output buffer for WOFF2 decompression. */
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#ifndef WOFF2_WOFF2_OUT_H_
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#define WOFF2_WOFF2_OUT_H_
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#include <algorithm>
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#include <cstring>
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#include <memory>
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#include <string>
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namespace woff2 {
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// Suggested max size for output.
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const size_t kDefaultMaxSize = 30 * 1024 * 1024;
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/**
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* Output interface for the woff2 decoding.
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*
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* Writes to arbitrary offsets are supported to facilitate updating offset
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* table and checksums after tables are ready. Reading the current size is
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* supported so a 'loca' table can be built up while writing glyphs.
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*
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* By default limits size to kDefaultMaxSize.
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*/
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class WOFF2Out {
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public:
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virtual ~WOFF2Out(void) {}
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// Append n bytes of data from buf.
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// Return true if all written, false otherwise.
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virtual bool Write(const void *buf, size_t n) = 0;
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// Write n bytes of data from buf at offset.
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// Return true if all written, false otherwise.
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virtual bool Write(const void *buf, size_t offset, size_t n) = 0;
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virtual size_t Size() = 0;
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};
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/**
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* Expanding memory block for woff2 out. By default limited to kDefaultMaxSize.
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*/
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class WOFF2StringOut : public WOFF2Out {
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public:
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// Create a writer that writes its data to buf.
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// buf->size() will grow to at most max_size
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// buf may be sized (e.g. using EstimateWOFF2FinalSize) or empty.
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explicit WOFF2StringOut(std::string* buf);
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bool Write(const void *buf, size_t n) override;
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bool Write(const void *buf, size_t offset, size_t n) override;
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size_t Size() override { return offset_; }
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size_t MaxSize() { return max_size_; }
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void SetMaxSize(size_t max_size);
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private:
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std::string* buf_;
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size_t max_size_;
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size_t offset_;
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};
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/**
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* Fixed memory block for woff2 out.
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*/
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class WOFF2MemoryOut : public WOFF2Out {
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public:
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// Create a writer that writes its data to buf.
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WOFF2MemoryOut(uint8_t* buf, size_t buf_size);
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bool Write(const void *buf, size_t n) override;
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bool Write(const void *buf, size_t offset, size_t n) override;
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size_t Size() override { return offset_; }
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private:
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uint8_t* buf_;
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size_t buf_size_;
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size_t offset_;
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};
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} // namespace woff2
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#endif // WOFF2_WOFF2_OUT_H_
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