Added brotli enc/ and tools/ directories.

third_party/brotli/enc/streams.h

+/* Copyright 2009 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+// Input and output classes for streaming brotli compression.
+
+#ifndef BROTLI_ENC_STREAMS_H_
+#define BROTLI_ENC_STREAMS_H_
+
+#include <stdio.h>
+#include <string>
+#include "./port.h"
+#include "./types.h"
+
+namespace brotli {
+
+// Input interface for the compression routines.
+class BrotliIn {
+ public:
+  virtual ~BrotliIn(void) {}
+
+  // Return a pointer to the next block of input of at most n bytes.
+  // Return the actual length in *nread.
+  // At end of data, return NULL. Don't return NULL if there is more data
+  // to read, even if called with n == 0.
+  // Read will only be called if some of its bytes are needed.
+  virtual const void* Read(size_t n, size_t* nread) = 0;
+};
+
+// Output interface for the compression routines.
+class BrotliOut {
+ public:
+  virtual ~BrotliOut(void) {}
+
+  // Write n bytes of data from buf.
+  // Return true if all written, false otherwise.
+  virtual bool Write(const void *buf, size_t n) = 0;
+};
+
+// Adapter class to make BrotliIn objects from raw memory.
+class BrotliMemIn : public BrotliIn {
+ public:
+  BrotliMemIn(const void* buf, size_t len);
+
+  void Reset(const void* buf, size_t len);
+
+  // returns the amount of data consumed
+  size_t position(void) const { return pos_; }
+
+  const void* Read(size_t n, size_t* OUTPUT);
+
+ private:
+  const void* buf_;  // start of input buffer
+  size_t len_;  // length of input
+  size_t pos_;  // current read position within input
+};
+
+// Adapter class to make BrotliOut objects from raw memory.
+class BrotliMemOut : public BrotliOut {
+ public:
+  BrotliMemOut(void* buf, size_t len);
+
+  void Reset(void* buf, size_t len);
+
+  // returns the amount of data written
+  size_t position(void) const { return pos_; }
+
+  bool Write(const void* buf, size_t n);
+
+ private:
+  void* buf_;  // start of output buffer
+  size_t len_;  // length of output
+  size_t pos_;  // current write position within output
+};
+
+// Adapter class to make BrotliOut objects from a string.
+class BrotliStringOut : public BrotliOut {
+ public:
+  // Create a writer that appends its data to buf.
+  // buf->size() will grow to at most max_size
+  // buf is expected to be empty when constructing BrotliStringOut.
+  BrotliStringOut(std::string* buf, size_t max_size);
+
+  void Reset(std::string* buf, size_t max_len);
+
+  bool Write(const void* buf, size_t n);
+
+ private:
+  std::string* buf_;  // start of output buffer
+  size_t max_size_;  // max length of output
+};
+
+// Adapter class to make BrotliIn object from a file.
+class BrotliFileIn : public BrotliIn {
+ public:
+  BrotliFileIn(FILE* f, size_t max_read_size);
+  ~BrotliFileIn(void);
+
+  const void* Read(size_t n, size_t* bytes_read);
+
+ private:
+  FILE* f_;
+  char* buf_;
+  size_t buf_size_;
+};
+
+// Adapter class to make BrotliOut object from a file.
+class BrotliFileOut : public BrotliOut {
+ public:
+  explicit BrotliFileOut(FILE* f);
+
+  bool Write(const void* buf, size_t n);
+ private:
+  FILE* f_;
+};
+
+}  // namespace brotli
+
+#endif  // BROTLI_ENC_STREAMS_H_