mirror of
https://github.com/google/brotli.git
synced 2024-12-28 18:51:08 +00:00
115 lines
2.5 KiB
C++
115 lines
2.5 KiB
C++
/* Copyright 2009 Google Inc. All Rights Reserved.
|
|
|
|
Distributed under MIT license.
|
|
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
|
|
*/
|
|
|
|
/* Convience routines to make Brotli I/O classes from some memory containers and
|
|
files. */
|
|
|
|
#include "./streams.h"
|
|
|
|
#include <assert.h>
|
|
#include <stdlib.h>
|
|
#include <string.h> /* memcpy */
|
|
|
|
namespace brotli {
|
|
|
|
BrotliMemOut::BrotliMemOut(void* buf, size_t len)
|
|
: buf_(buf),
|
|
len_(len),
|
|
pos_(0) {}
|
|
|
|
void BrotliMemOut::Reset(void* buf, size_t len) {
|
|
buf_ = buf;
|
|
len_ = len;
|
|
pos_ = 0;
|
|
}
|
|
|
|
/* Brotli output routine: copy n bytes to the output buffer. */
|
|
bool BrotliMemOut::Write(const void *buf, size_t n) {
|
|
if (n + pos_ > len_)
|
|
return false;
|
|
char* p = reinterpret_cast<char*>(buf_) + pos_;
|
|
memcpy(p, buf, n);
|
|
pos_ += n;
|
|
return true;
|
|
}
|
|
|
|
BrotliStringOut::BrotliStringOut(std::string* buf, size_t max_size)
|
|
: buf_(buf),
|
|
max_size_(max_size) {
|
|
assert(buf->empty());
|
|
}
|
|
|
|
void BrotliStringOut::Reset(std::string* buf, size_t max_size) {
|
|
buf_ = buf;
|
|
max_size_ = max_size;
|
|
}
|
|
|
|
/* Brotli output routine: add n bytes to a string. */
|
|
bool BrotliStringOut::Write(const void *buf, size_t n) {
|
|
if (buf_->size() + n > max_size_)
|
|
return false;
|
|
buf_->append(static_cast<const char*>(buf), n);
|
|
return true;
|
|
}
|
|
|
|
BrotliMemIn::BrotliMemIn(const void* buf, size_t len)
|
|
: buf_(buf),
|
|
len_(len),
|
|
pos_(0) {}
|
|
|
|
void BrotliMemIn::Reset(const void* buf, size_t len) {
|
|
buf_ = buf;
|
|
len_ = len;
|
|
pos_ = 0;
|
|
}
|
|
|
|
/* Brotli input routine: read the next chunk of memory. */
|
|
const void* BrotliMemIn::Read(size_t n, size_t* output) {
|
|
if (pos_ == len_) {
|
|
return NULL;
|
|
}
|
|
if (n > len_ - pos_)
|
|
n = len_ - pos_;
|
|
const char* p = reinterpret_cast<const char*>(buf_) + pos_;
|
|
pos_ += n;
|
|
*output = n;
|
|
return p;
|
|
}
|
|
|
|
BrotliFileIn::BrotliFileIn(FILE* f, size_t max_read_size)
|
|
: f_(f),
|
|
buf_(new char[max_read_size]),
|
|
buf_size_(max_read_size) { }
|
|
|
|
BrotliFileIn::~BrotliFileIn(void) {
|
|
delete[] buf_;
|
|
}
|
|
|
|
const void* BrotliFileIn::Read(size_t n, size_t* bytes_read) {
|
|
if (n > buf_size_) {
|
|
n = buf_size_;
|
|
} else if (n == 0) {
|
|
return feof(f_) ? NULL : buf_;
|
|
}
|
|
*bytes_read = fread(buf_, 1, n, f_);
|
|
if (*bytes_read == 0) {
|
|
return NULL;
|
|
} else {
|
|
return buf_;
|
|
}
|
|
}
|
|
|
|
BrotliFileOut::BrotliFileOut(FILE* f) : f_(f) {}
|
|
|
|
bool BrotliFileOut::Write(const void* buf, size_t n) {
|
|
if (fwrite(buf, n, 1, f_) != 1) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
} /* namespace brotli */
|