third_party/brotli/dec/streams.c

   1 /* Copyright 2013 Google Inc. All Rights Reserved.
   2
   3    Licensed under the Apache License, Version 2.0 (the "License");
   4    you may not use this file except in compliance with the License.
   5    You may obtain a copy of the License at
   6
   7    http://www.apache.org/licenses/LICENSE-2.0
   8
   9    Unless required by applicable law or agreed to in writing, software
  10    distributed under the License is distributed on an "AS IS" BASIS,
  11    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12    See the License for the specific language governing permissions and
  13    limitations under the License.
  14 */
  15
  16 /* Functions for streaming input and output. */
  17
  18 #include <string.h>
  19 #ifndef _WIN32
  20 #include <unistd.h>
  21 #endif
  22 #include "./streams.h"
  23
  24 #if defined(__cplusplus) || defined(c_plusplus)
  25 extern "C" {
  26 #endif
  27
  28 int BrotliMemInputFunction(void* data, uint8_t* buf, size_t count) {
  29   BrotliMemInput* input = (BrotliMemInput*)data;
  30   if (input->pos > input->length) {
  31     return -1;
  32   }
  33   if (input->pos + count > input->length) {
  34     count = input->length - input->pos;
  35   }
  36   memcpy(buf, input->buffer + input->pos, count);
  37   input->pos += count;
  38   return (int)count;
  39 }
  40
  41 BrotliInput BrotliInitMemInput(const uint8_t* buffer, size_t length,
  42                                BrotliMemInput* mem_input) {
  43   BrotliInput input;
  44   mem_input->buffer = buffer;
  45   mem_input->length = length;
  46   mem_input->pos = 0;
  47   input.cb_ = &BrotliMemInputFunction;
  48   input.data_ = mem_input;
  49   return input;
  50 }
  51
  52 int BrotliMemOutputFunction(void* data, const uint8_t* buf, size_t count) {
  53   BrotliMemOutput* output = (BrotliMemOutput*)data;
  54   size_t limit = output->length - output->pos;
  55   if (count > limit) {
  56     count = limit;
  57   }
  58   memcpy(output->buffer + output->pos, buf, count);
  59   output->pos += count;
  60   return (int)count;
  61 }
  62
  63 BrotliOutput BrotliInitMemOutput(uint8_t* buffer, size_t length,
  64                                  BrotliMemOutput* mem_output) {
  65   BrotliOutput output;
  66   mem_output->buffer = buffer;
  67   mem_output->length = length;
  68   mem_output->pos = 0;
  69   output.cb_ = &BrotliMemOutputFunction;
  70   output.data_ = mem_output;
  71   return output;
  72 }
  73
  74 int BrotliStdinInputFunction(void* data, uint8_t* buf, size_t count) {
  75   (void) data; /* Shut up LLVM */
  76 #ifndef _WIN32
  77   return (int)read(STDIN_FILENO, buf, count);
  78 #else
  79   return -1;
  80 #endif
  81 }
  82
  83 BrotliInput BrotliStdinInput() {
  84   BrotliInput in;
  85   in.cb_ = BrotliStdinInputFunction;
  86   in.data_ = NULL;
  87   return in;
  88 }
  89
  90 int BrotliStdoutOutputFunction(void* data, const uint8_t* buf, size_t count) {
  91   (void) data; /* Shut up LLVM */
  92 #ifndef _WIN32
  93   return (int)write(STDOUT_FILENO, buf, count);
  94 #else
  95   return -1;
  96 #endif
  97 }
  98
  99 BrotliOutput BrotliStdoutOutput() {
 100   BrotliOutput out;
 101   out.cb_ = BrotliStdoutOutputFunction;
 102   out.data_ = NULL;
 103   return out;
 104 }
 105
 106 int BrotliFileInputFunction(void* data, uint8_t* buf, size_t count) {
 107   return (int)fread(buf, 1, count, (FILE*)data);
 108 }
 109
 110 BrotliInput BrotliFileInput(FILE* f) {
 111   BrotliInput in;
 112   in.cb_ = BrotliFileInputFunction;
 113   in.data_ = f;
 114   return in;
 115 }
 116
 117 int BrotliFileOutputFunction(void* data, const uint8_t* buf, size_t count) {
 118   return (int)fwrite(buf, 1, count, (FILE*)data);
 119 }
 120
 121 BrotliOutput BrotliFileOutput(FILE* f) {
 122   BrotliOutput out;
 123   out.cb_ = BrotliFileOutputFunction;
 124   out.data_ = f;
 125   return out;
 126 }
 127
 128
 129 #if defined(__cplusplus) || defined(c_plusplus)
 130 }    /* extern "C" */
 131 #endif