modules/brotli/dec/streams.c
author Paul Adenot <paul@paul.cx>
Tue, 09 Dec 2014 11:37:01 +0100
changeset 231823 542c432f2c3b253075d60a13577bbe8c1abdcf4c
parent 208814 3f412cb1d5ce40901c064449149adfb143ded7b3
permissions -rw-r--r--
Bug 1108455 - Part 2. r=jesup, a=sledru

/* Copyright 2013 Google Inc. All Rights Reserved.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

   Functions for streaming input and output.
*/

#include <string.h>
#ifndef _WIN32
#include <unistd.h>
#endif
#include "./streams.h"

#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif

int BrotliMemInputFunction(void* data, uint8_t* buf, size_t count) {
  BrotliMemInput* input = (BrotliMemInput*)data;
  if (input->pos > input->length) {
    return -1;
  }
  if (input->pos + count > input->length) {
    count = input->length - input->pos;
  }
  memcpy(buf, input->buffer + input->pos, count);
  input->pos += count;
  return (int)count;
}

BrotliInput BrotliInitMemInput(const uint8_t* buffer, size_t length,
                               BrotliMemInput* mem_input) {
  BrotliInput input;
  mem_input->buffer = buffer;
  mem_input->length = length;
  mem_input->pos = 0;
  input.cb_ = &BrotliMemInputFunction;
  input.data_ = mem_input;
  return input;
}

int BrotliMemOutputFunction(void* data, const uint8_t* buf, size_t count) {
  BrotliMemOutput* output = (BrotliMemOutput*)data;
  if (output->pos + count > output->length) {
    return -1;
  }
  memcpy(output->buffer + output->pos, buf, count);
  output->pos += count;
  return (int)count;
}

BrotliOutput BrotliInitMemOutput(uint8_t* buffer, size_t length,
                                 BrotliMemOutput* mem_output) {
  BrotliOutput output;
  mem_output->buffer = buffer;
  mem_output->length = length;
  mem_output->pos = 0;
  output.cb_ = &BrotliMemOutputFunction;
  output.data_ = mem_output;
  return output;
}

int BrotliStdinInputFunction(void* data, uint8_t* buf, size_t count) {
#ifndef _WIN32
  return (int)read(STDIN_FILENO, buf, count);
#else
  return -1;
#endif
}

BrotliInput BrotliStdinInput() {
  BrotliInput in;
  in.cb_ = BrotliStdinInputFunction;
  in.data_ = NULL;
  return in;
}

int BrotliStdoutOutputFunction(void* data, const uint8_t* buf, size_t count) {
#ifndef _WIN32
  return (int)write(STDOUT_FILENO, buf, count);
#else
  return -1;
#endif
}

BrotliOutput BrotliStdoutOutput() {
  BrotliOutput out;
  out.cb_ = BrotliStdoutOutputFunction;
  out.data_ = NULL;
  return out;
}

int BrotliFileOutputFunction(void* data, const uint8_t* buf, size_t count) {
  return (int)fwrite(buf, 1, count, (FILE*)data);
}

BrotliOutput BrotliFileOutput(FILE* f) {
  BrotliOutput out;
  out.cb_ = BrotliFileOutputFunction;
  out.data_ = f;
  return out;
}


#if defined(__cplusplus) || defined(c_plusplus)
}    /* extern "C" */
#endif