1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
// LZ4 streaming API example : line-by-line logfile compression
// by Takayuki Matsuoka
#if defined(_MSC_VER) && (_MSC_VER <= 1800) /* Visual Studio <= 2013 */
# define _CRT_SECURE_NO_WARNINGS
# define snprintf sprintf_s
#endif
#include "lz4.h"
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
static size_t write_uint16(FILE* fp, uint16_t i)
{
return fwrite(&i, sizeof(i), 1, fp);
}
static size_t write_bin(FILE* fp, const void* array, int arrayBytes)
{
return fwrite(array, 1, arrayBytes, fp);
}
static size_t read_uint16(FILE* fp, uint16_t* i)
{
return fread(i, sizeof(*i), 1, fp);
}
static size_t read_bin(FILE* fp, void* array, int arrayBytes)
{
return fread(array, 1, arrayBytes, fp);
}
static void test_compress(
FILE* outFp,
FILE* inpFp,
size_t messageMaxBytes,
size_t ringBufferBytes)
{
LZ4_stream_t* const lz4Stream = LZ4_createStream();
const size_t cmpBufBytes = LZ4_COMPRESSBOUND(messageMaxBytes);
char* const cmpBuf = (char*) malloc(cmpBufBytes);
char* const inpBuf = (char*) malloc(ringBufferBytes);
int inpOffset = 0;
for ( ; ; )
{
char* const inpPtr = &inpBuf[inpOffset];
#if 0
// Read random length data to the ring buffer.
const int randomLength = (rand() % messageMaxBytes) + 1;
const int inpBytes = (int) read_bin(inpFp, inpPtr, randomLength);
if (0 == inpBytes) break;
#else
// Read line to the ring buffer.
int inpBytes = 0;
if (!fgets(inpPtr, (int) messageMaxBytes, inpFp))
break;
inpBytes = (int) strlen(inpPtr);
#endif
{
const int cmpBytes = LZ4_compress_fast_continue(
lz4Stream, inpPtr, cmpBuf, inpBytes, (int) cmpBufBytes, 1);
if (cmpBytes <= 0) break;
write_uint16(outFp, (uint16_t) cmpBytes);
write_bin(outFp, cmpBuf, cmpBytes);
// Add and wraparound the ringbuffer offset
inpOffset += inpBytes;
if ((size_t)inpOffset >= ringBufferBytes - messageMaxBytes) inpOffset = 0;
}
}
write_uint16(outFp, 0);
free(inpBuf);
free(cmpBuf);
LZ4_freeStream(lz4Stream);
}
static void test_decompress(
FILE* outFp,
FILE* inpFp,
size_t messageMaxBytes,
size_t ringBufferBytes)
{
LZ4_streamDecode_t* const lz4StreamDecode = LZ4_createStreamDecode();
char* const cmpBuf = (char*) malloc(LZ4_COMPRESSBOUND(messageMaxBytes));
char* const decBuf = (char*) malloc(ringBufferBytes);
int decOffset = 0;
for ( ; ; )
{
uint16_t cmpBytes = 0;
if (read_uint16(inpFp, &cmpBytes) != 1) break;
if (cmpBytes == 0) break;
if (read_bin(inpFp, cmpBuf, cmpBytes) != cmpBytes) break;
{
char* const decPtr = &decBuf[decOffset];
const int decBytes = LZ4_decompress_safe_continue(
lz4StreamDecode, cmpBuf, decPtr, cmpBytes, (int) messageMaxBytes);
if (decBytes <= 0) break;
write_bin(outFp, decPtr, decBytes);
// Add and wraparound the ringbuffer offset
decOffset += decBytes;
if ((size_t)decOffset >= ringBufferBytes - messageMaxBytes) decOffset = 0;
}
}
free(decBuf);
free(cmpBuf);
LZ4_freeStreamDecode(lz4StreamDecode);
}
static int compare(FILE* f0, FILE* f1)
{
int result = 0;
const size_t tempBufferBytes = 65536;
char* const b0 = (char*) malloc(tempBufferBytes);
char* const b1 = (char*) malloc(tempBufferBytes);
while(0 == result)
{
const size_t r0 = fread(b0, 1, tempBufferBytes, f0);
const size_t r1 = fread(b1, 1, tempBufferBytes, f1);
result = (int) r0 - (int) r1;
if (0 == r0 || 0 == r1) break;
if (0 == result) result = memcmp(b0, b1, r0);
}
free(b1);
free(b0);
return result;
}
int main(int argc, char* argv[])
{
enum {
MESSAGE_MAX_BYTES = 1024,
RING_BUFFER_BYTES = 1024 * 256 + MESSAGE_MAX_BYTES,
};
char inpFilename[256] = { 0 };
char lz4Filename[256] = { 0 };
char decFilename[256] = { 0 };
if (argc < 2)
{
printf("Please specify input filename\n");
return 0;
}
snprintf(inpFilename, 256, "%s", argv[1]);
snprintf(lz4Filename, 256, "%s.lz4s", argv[1]);
snprintf(decFilename, 256, "%s.lz4s.dec", argv[1]);
printf("inp = [%s]\n", inpFilename);
printf("lz4 = [%s]\n", lz4Filename);
printf("dec = [%s]\n", decFilename);
// compress
{
FILE* inpFp = fopen(inpFilename, "rb");
FILE* outFp = fopen(lz4Filename, "wb");
test_compress(outFp, inpFp, MESSAGE_MAX_BYTES, RING_BUFFER_BYTES);
fclose(outFp);
fclose(inpFp);
}
// decompress
{
FILE* inpFp = fopen(lz4Filename, "rb");
FILE* outFp = fopen(decFilename, "wb");
test_decompress(outFp, inpFp, MESSAGE_MAX_BYTES, RING_BUFFER_BYTES);
fclose(outFp);
fclose(inpFp);
}
// verify
{
FILE* inpFp = fopen(inpFilename, "rb");
FILE* decFp = fopen(decFilename, "rb");
const int cmp = compare(inpFp, decFp);
if (0 == cmp)
printf("Verify : OK\n");
else
printf("Verify : NG\n");
fclose(decFp);
fclose(inpFp);
}
return 0;
}
|
