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 Functions for streaming input and output.
16 */
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
BrotliMemInputFunction(void * data,uint8_t * buf,size_t count)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
BrotliInitMemInput(const uint8_t * buffer,size_t length,BrotliMemInput * mem_input)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
BrotliMemOutputFunction(void * data,const uint8_t * buf,size_t count)52 int BrotliMemOutputFunction(void* data, const uint8_t* buf, size_t count) {
53 BrotliMemOutput* output = (BrotliMemOutput*)data;
54 if (output->pos + count > output->length) {
55 return -1;
56 }
57 memcpy(output->buffer + output->pos, buf, count);
58 output->pos += count;
59 return (int)count;
60 }
61
BrotliInitMemOutput(uint8_t * buffer,size_t length,BrotliMemOutput * mem_output)62 BrotliOutput BrotliInitMemOutput(uint8_t* buffer, size_t length,
63 BrotliMemOutput* mem_output) {
64 BrotliOutput output;
65 mem_output->buffer = buffer;
66 mem_output->length = length;
67 mem_output->pos = 0;
68 output.cb_ = &BrotliMemOutputFunction;
69 output.data_ = mem_output;
70 return output;
71 }
72
BrotliStdinInputFunction(void * data,uint8_t * buf,size_t count)73 int BrotliStdinInputFunction(void* data, uint8_t* buf, size_t count) {
74 #ifndef _WIN32
75 return (int)read(STDIN_FILENO, buf, count);
76 #else
77 return -1;
78 #endif
79 }
80
BrotliStdinInput()81 BrotliInput BrotliStdinInput() {
82 BrotliInput in;
83 in.cb_ = BrotliStdinInputFunction;
84 in.data_ = NULL;
85 return in;
86 }
87
BrotliStdoutOutputFunction(void * data,const uint8_t * buf,size_t count)88 int BrotliStdoutOutputFunction(void* data, const uint8_t* buf, size_t count) {
89 #ifndef _WIN32
90 return (int)write(STDOUT_FILENO, buf, count);
91 #else
92 return -1;
93 #endif
94 }
95
BrotliStdoutOutput()96 BrotliOutput BrotliStdoutOutput() {
97 BrotliOutput out;
98 out.cb_ = BrotliStdoutOutputFunction;
99 out.data_ = NULL;
100 return out;
101 }
102
BrotliFileOutputFunction(void * data,const uint8_t * buf,size_t count)103 int BrotliFileOutputFunction(void* data, const uint8_t* buf, size_t count) {
104 return (int)fwrite(buf, 1, count, (FILE*)data);
105 }
106
BrotliFileOutput(FILE * f)107 BrotliOutput BrotliFileOutput(FILE* f) {
108 BrotliOutput out;
109 out.cb_ = BrotliFileOutputFunction;
110 out.data_ = f;
111 return out;
112 }
113
114
115 #if defined(__cplusplus) || defined(c_plusplus)
116 } /* extern "C" */
117 #endif
118