Add necessary header for LIBAVUTIL_VERSION_MAJOR, fixes the warning:
[libav.git] / libavutil / lzo.c
1 /*
2 * LZO 1x decompression
3 * Copyright (c) 2006 Reimar Doeffinger
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "avutil.h"
23 #include "common.h"
24 //! Avoid e.g. MPlayers fast_memcpy, it slows things down here.
25 #undef memcpy
26 #include <string.h>
27 #include "lzo.h"
28
29 //! Define if we may write up to 12 bytes beyond the output buffer.
30 #define OUTBUF_PADDED 1
31 //! Define if we may read up to 8 bytes beyond the input buffer.
32 #define INBUF_PADDED 1
33 typedef struct LZOContext {
34 const uint8_t *in, *in_end;
35 uint8_t *out_start, *out, *out_end;
36 int error;
37 } LZOContext;
38
39 /**
40 * \brief Reads one byte from the input buffer, avoiding an overrun.
41 * \return byte read
42 */
43 static inline int get_byte(LZOContext *c) {
44 if (c->in < c->in_end)
45 return *c->in++;
46 c->error |= AV_LZO_INPUT_DEPLETED;
47 return 1;
48 }
49
50 #ifdef INBUF_PADDED
51 #define GETB(c) (*(c).in++)
52 #else
53 #define GETB(c) get_byte(&(c))
54 #endif
55
56 /**
57 * \brief Decodes a length value in the coding used by lzo.
58 * \param x previous byte value
59 * \param mask bits used from x
60 * \return decoded length value
61 */
62 static inline int get_len(LZOContext *c, int x, int mask) {
63 int cnt = x & mask;
64 if (!cnt) {
65 while (!(x = get_byte(c))) cnt += 255;
66 cnt += mask + x;
67 }
68 return cnt;
69 }
70
71 //#define UNALIGNED_LOADSTORE
72 #define BUILTIN_MEMCPY
73 #ifdef UNALIGNED_LOADSTORE
74 #define COPY2(d, s) *(uint16_t *)(d) = *(uint16_t *)(s);
75 #define COPY4(d, s) *(uint32_t *)(d) = *(uint32_t *)(s);
76 #elif defined(BUILTIN_MEMCPY)
77 #define COPY2(d, s) memcpy(d, s, 2);
78 #define COPY4(d, s) memcpy(d, s, 4);
79 #else
80 #define COPY2(d, s) (d)[0] = (s)[0]; (d)[1] = (s)[1];
81 #define COPY4(d, s) (d)[0] = (s)[0]; (d)[1] = (s)[1]; (d)[2] = (s)[2]; (d)[3] = (s)[3];
82 #endif
83
84 /**
85 * \brief Copies bytes from input to output buffer with checking.
86 * \param cnt number of bytes to copy, must be >= 0
87 */
88 static inline void copy(LZOContext *c, int cnt) {
89 register const uint8_t *src = c->in;
90 register uint8_t *dst = c->out;
91 if (cnt > c->in_end - src) {
92 cnt = FFMAX(c->in_end - src, 0);
93 c->error |= AV_LZO_INPUT_DEPLETED;
94 }
95 if (cnt > c->out_end - dst) {
96 cnt = FFMAX(c->out_end - dst, 0);
97 c->error |= AV_LZO_OUTPUT_FULL;
98 }
99 #if defined(INBUF_PADDED) && defined(OUTBUF_PADDED)
100 COPY4(dst, src);
101 src += 4;
102 dst += 4;
103 cnt -= 4;
104 if (cnt > 0)
105 #endif
106 memcpy(dst, src, cnt);
107 c->in = src + cnt;
108 c->out = dst + cnt;
109 }
110
111 static inline void memcpy_backptr(uint8_t *dst, int back, int cnt);
112
113 /**
114 * \brief Copies previously decoded bytes to current position.
115 * \param back how many bytes back we start
116 * \param cnt number of bytes to copy, must be >= 0
117 *
118 * cnt > back is valid, this will copy the bytes we just copied,
119 * thus creating a repeating pattern with a period length of back.
120 */
121 static inline void copy_backptr(LZOContext *c, int back, int cnt) {
122 register const uint8_t *src = &c->out[-back];
123 register uint8_t *dst = c->out;
124 if (src < c->out_start || src > dst) {
125 c->error |= AV_LZO_INVALID_BACKPTR;
126 return;
127 }
128 if (cnt > c->out_end - dst) {
129 cnt = FFMAX(c->out_end - dst, 0);
130 c->error |= AV_LZO_OUTPUT_FULL;
131 }
132 memcpy_backptr(dst, back, cnt);
133 c->out = dst + cnt;
134 }
135
136 static inline void memcpy_backptr(uint8_t *dst, int back, int cnt) {
137 const uint8_t *src = &dst[-back];
138 if (back == 1) {
139 memset(dst, *src, cnt);
140 } else {
141 #ifdef OUTBUF_PADDED
142 COPY2(dst, src);
143 COPY2(dst + 2, src + 2);
144 src += 4;
145 dst += 4;
146 cnt -= 4;
147 if (cnt > 0) {
148 COPY2(dst, src);
149 COPY2(dst + 2, src + 2);
150 COPY2(dst + 4, src + 4);
151 COPY2(dst + 6, src + 6);
152 src += 8;
153 dst += 8;
154 cnt -= 8;
155 }
156 #endif
157 if (cnt > 0) {
158 int blocklen = back;
159 while (cnt > blocklen) {
160 memcpy(dst, src, blocklen);
161 dst += blocklen;
162 cnt -= blocklen;
163 blocklen <<= 1;
164 }
165 memcpy(dst, src, cnt);
166 }
167 }
168 }
169
170 void av_memcpy_backptr(uint8_t *dst, int back, int cnt) {
171 memcpy_backptr(dst, back, cnt);
172 }
173
174 int av_lzo1x_decode(void *out, int *outlen, const void *in, int *inlen) {
175 int state= 0;
176 int x;
177 LZOContext c;
178 c.in = in;
179 c.in_end = (const uint8_t *)in + *inlen;
180 c.out = c.out_start = out;
181 c.out_end = (uint8_t *)out + * outlen;
182 c.error = 0;
183 x = GETB(c);
184 if (x > 17) {
185 copy(&c, x - 17);
186 x = GETB(c);
187 if (x < 16) c.error |= AV_LZO_ERROR;
188 }
189 if (c.in > c.in_end)
190 c.error |= AV_LZO_INPUT_DEPLETED;
191 while (!c.error) {
192 int cnt, back;
193 if (x > 15) {
194 if (x > 63) {
195 cnt = (x >> 5) - 1;
196 back = (GETB(c) << 3) + ((x >> 2) & 7) + 1;
197 } else if (x > 31) {
198 cnt = get_len(&c, x, 31);
199 x = GETB(c);
200 back = (GETB(c) << 6) + (x >> 2) + 1;
201 } else {
202 cnt = get_len(&c, x, 7);
203 back = (1 << 14) + ((x & 8) << 11);
204 x = GETB(c);
205 back += (GETB(c) << 6) + (x >> 2);
206 if (back == (1 << 14)) {
207 if (cnt != 1)
208 c.error |= AV_LZO_ERROR;
209 break;
210 }
211 }
212 } else if(!state){
213 cnt = get_len(&c, x, 15);
214 copy(&c, cnt + 3);
215 x = GETB(c);
216 if (x > 15)
217 continue;
218 cnt = 1;
219 back = (1 << 11) + (GETB(c) << 2) + (x >> 2) + 1;
220 } else {
221 cnt = 0;
222 back = (GETB(c) << 2) + (x >> 2) + 1;
223 }
224 copy_backptr(&c, back, cnt + 2);
225 state=
226 cnt = x & 3;
227 copy(&c, cnt);
228 x = GETB(c);
229 }
230 *inlen = c.in_end - c.in;
231 if (c.in > c.in_end)
232 *inlen = 0;
233 *outlen = c.out_end - c.out;
234 return c.error;
235 }
236
237 #if LIBAVUTIL_VERSION_MAJOR < 50
238 int lzo1x_decode(void *out, int *outlen, const void *in, int *inlen) {
239 return av_lzo1x_decode(out, outlen, in, inlen);
240 }
241 #endif
242
243 #ifdef TEST
244 #include <stdio.h>
245 #include <lzo/lzo1x.h>
246 #include "log.h"
247 #define MAXSZ (10*1024*1024)
248 int main(int argc, char *argv[]) {
249 FILE *in = fopen(argv[1], "rb");
250 uint8_t *orig = av_malloc(MAXSZ + 16);
251 uint8_t *comp = av_malloc(2*MAXSZ + 16);
252 uint8_t *decomp = av_malloc(MAXSZ + 16);
253 size_t s = fread(orig, 1, MAXSZ, in);
254 lzo_uint clen = 0;
255 long tmp[LZO1X_MEM_COMPRESS];
256 int inlen, outlen;
257 int i;
258 av_log_level = AV_LOG_DEBUG;
259 lzo1x_999_compress(orig, s, comp, &clen, tmp);
260 for (i = 0; i < 300; i++) {
261 START_TIMER
262 inlen = clen; outlen = MAXSZ;
263 #ifdef LIBLZO
264 if (lzo1x_decompress_safe(comp, inlen, decomp, &outlen, NULL))
265 #elif defined(LIBLZO_UNSAFE)
266 if (lzo1x_decompress(comp, inlen, decomp, &outlen, NULL))
267 #else
268 if (av_lzo1x_decode(decomp, &outlen, comp, &inlen))
269 #endif
270 av_log(NULL, AV_LOG_ERROR, "decompression error\n");
271 STOP_TIMER("lzod")
272 }
273 if (memcmp(orig, decomp, s))
274 av_log(NULL, AV_LOG_ERROR, "decompression incorrect\n");
275 else
276 av_log(NULL, AV_LOG_ERROR, "decompression OK\n");
277 return 0;
278 }
279 #endif