/* Copyright 2016 Google Inc. All Rights Reserved.
Distributed under MIT license.
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/
/* Output buffer for WOFF2 decompression. */
#ifndef WOFF2_WOFF2_OUT_H_
#define WOFF2_WOFF2_OUT_H_
#include <algorithm>
#include <cstring>
#include <memory>
#include <string>
namespace woff2 {
// Suggested max size for output.
const size_t kDefaultMaxSize =
30 *
1024 *
1024;
/**
* Output interface for the woff2 decoding.
*
* Writes to arbitrary offsets are supported to facilitate updating offset
* table and checksums after tables are ready. Reading the current size is
* supported so a 'loca' table can be built up while writing glyphs.
*
* By default limits size to kDefaultMaxSize.
*/
class WOFF2Out {
public:
virtual ~WOFF2Out(
void) {}
// Append n bytes of data from buf.
// Return true if all written, false otherwise.
virtual bool Write(
const void *buf, size_t n) =
0;
// Write n bytes of data from buf at offset.
// Return true if all written, false otherwise.
virtual bool Write(
const void *buf, size_t offset, size_t n) =
0;
virtual size_t Size() =
0;
};
/**
* Expanding memory block for woff2 out. By default limited to kDefaultMaxSize.
*/
class WOFF2StringOut :
public WOFF2Out {
public:
// Create a writer that writes its data to buf.
// buf->size() will grow to at most max_size
// buf may be sized (e.g. using EstimateWOFF2FinalSize) or empty.
explicit WOFF2StringOut(std::string *buf);
bool Write(
const void *buf, size_t n) override;
bool Write(
const void *buf, size_t offset, size_t n) override;
size_t Size() override {
return offset_; }
size_t MaxSize() {
return max_size_; }
void SetMaxSize(size_t max_size);
private:
std::string *buf_;
size_t max_size_;
size_t offset_;
};
/**
* Fixed memory block for woff2 out.
*/
class WOFF2MemoryOut :
public WOFF2Out {
public:
// Create a writer that writes its data to buf.
WOFF2MemoryOut(uint8_t* buf, size_t buf_size);
bool Write(
const void *buf, size_t n) override;
bool Write(
const void *buf, size_t offset, size_t n) override;
size_t Size() override {
return offset_; }
private:
uint8_t* buf_;
size_t buf_size_;
size_t offset_;
};
}
// namespace woff2
#endif // WOFF2_WOFF2_OUT_H_
