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lzo.c
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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 <string.h>
23 
24 #include "avutil.h"
25 #include "avassert.h"
26 #include "common.h"
27 #include "intreadwrite.h"
28 #include "lzo.h"
29 
30 /// Define if we may write up to 12 bytes beyond the output buffer.
31 #define OUTBUF_PADDED 1
32 /// Define if we may read up to 8 bytes beyond the input buffer.
33 #define INBUF_PADDED 1
34 
35 typedef struct LZOContext {
36  const uint8_t *in, *in_end;
38  int error;
39 } LZOContext;
40 
41 /**
42  * @brief Reads one byte from the input buffer, avoiding an overrun.
43  * @return byte read
44  */
45 static inline int get_byte(LZOContext *c)
46 {
47  if (c->in < c->in_end)
48  return *c->in++;
50  return 1;
51 }
52 
53 #ifdef INBUF_PADDED
54 #define GETB(c) (*(c).in++)
55 #else
56 #define GETB(c) get_byte(&(c))
57 #endif
58 
59 /**
60  * @brief Decodes a length value in the coding used by lzo.
61  * @param x previous byte value
62  * @param mask bits used from x
63  * @return decoded length value
64  */
65 static inline int get_len(LZOContext *c, int x, int mask)
66 {
67  int cnt = x & mask;
68  if (!cnt) {
69  while (!(x = get_byte(c))) {
70  if (cnt >= INT_MAX - 1000) {
71  c->error |= AV_LZO_ERROR;
72  break;
73  }
74  cnt += 255;
75  }
76  cnt += mask + x;
77  }
78  return cnt;
79 }
80 
81 /**
82  * @brief Copies bytes from input to output buffer with checking.
83  * @param cnt number of bytes to copy, must be >= 0
84  */
85 static inline void copy(LZOContext *c, int cnt)
86 {
87  register const uint8_t *src = c->in;
88  register uint8_t *dst = c->out;
89  av_assert0(cnt >= 0);
90  if (cnt > c->in_end - src) {
91  cnt = FFMAX(c->in_end - src, 0);
93  }
94  if (cnt > c->out_end - dst) {
95  cnt = FFMAX(c->out_end - dst, 0);
97  }
98 #if defined(INBUF_PADDED) && defined(OUTBUF_PADDED)
99  AV_COPY32U(dst, src);
100  src += 4;
101  dst += 4;
102  cnt -= 4;
103  if (cnt > 0)
104 #endif
105  memcpy(dst, src, cnt);
106  c->in = src + cnt;
107  c->out = dst + cnt;
108 }
109 
110 /**
111  * @brief Copies previously decoded bytes to current position.
112  * @param back how many bytes back we start, must be > 0
113  * @param cnt number of bytes to copy, must be > 0
114  *
115  * cnt > back is valid, this will copy the bytes we just copied,
116  * thus creating a repeating pattern with a period length of back.
117  */
118 static inline void copy_backptr(LZOContext *c, int back, int cnt)
119 {
120  register uint8_t *dst = c->out;
121  av_assert0(cnt > 0);
122  if (dst - c->out_start < back) {
124  return;
125  }
126  if (cnt > c->out_end - dst) {
127  cnt = FFMAX(c->out_end - dst, 0);
129  }
130  av_memcpy_backptr(dst, back, cnt);
131  c->out = dst + cnt;
132 }
133 
134 int av_lzo1x_decode(void *out, int *outlen, const void *in, int *inlen)
135 {
136  int state = 0;
137  int x;
138  LZOContext c;
139  if (*outlen <= 0 || *inlen <= 0) {
140  int res = 0;
141  if (*outlen <= 0)
142  res |= AV_LZO_OUTPUT_FULL;
143  if (*inlen <= 0)
144  res |= AV_LZO_INPUT_DEPLETED;
145  return res;
146  }
147  c.in = in;
148  c.in_end = (const uint8_t *)in + *inlen;
149  c.out = c.out_start = out;
150  c.out_end = (uint8_t *)out + *outlen;
151  c.error = 0;
152  x = GETB(c);
153  if (x > 17) {
154  copy(&c, x - 17);
155  x = GETB(c);
156  if (x < 16)
157  c.error |= AV_LZO_ERROR;
158  }
159  if (c.in > c.in_end)
161  while (!c.error) {
162  int cnt, back;
163  if (x > 15) {
164  if (x > 63) {
165  cnt = (x >> 5) - 1;
166  back = (GETB(c) << 3) + ((x >> 2) & 7) + 1;
167  } else if (x > 31) {
168  cnt = get_len(&c, x, 31);
169  x = GETB(c);
170  back = (GETB(c) << 6) + (x >> 2) + 1;
171  } else {
172  cnt = get_len(&c, x, 7);
173  back = (1 << 14) + ((x & 8) << 11);
174  x = GETB(c);
175  back += (GETB(c) << 6) + (x >> 2);
176  if (back == (1 << 14)) {
177  if (cnt != 1)
178  c.error |= AV_LZO_ERROR;
179  break;
180  }
181  }
182  } else if (!state) {
183  cnt = get_len(&c, x, 15);
184  copy(&c, cnt + 3);
185  x = GETB(c);
186  if (x > 15)
187  continue;
188  cnt = 1;
189  back = (1 << 11) + (GETB(c) << 2) + (x >> 2) + 1;
190  } else {
191  cnt = 0;
192  back = (GETB(c) << 2) + (x >> 2) + 1;
193  }
194  copy_backptr(&c, back, cnt + 2);
195  state =
196  cnt = x & 3;
197  copy(&c, cnt);
198  x = GETB(c);
199  }
200  *inlen = c.in_end - c.in;
201  if (c.in > c.in_end)
202  *inlen = 0;
203  *outlen = c.out_end - c.out;
204  return c.error;
205 }
206 
207 #ifdef TEST
208 #include <stdio.h>
209 #include <lzo/lzo1x.h>
210 #include "log.h"
211 #define MAXSZ (10*1024*1024)
212 
213 /* Define one of these to 1 if you wish to benchmark liblzo
214  * instead of our native implementation. */
215 #define BENCHMARK_LIBLZO_SAFE 0
216 #define BENCHMARK_LIBLZO_UNSAFE 0
217 
218 int main(int argc, char *argv[]) {
219  FILE *in = fopen(argv[1], "rb");
220  int comp_level = argc > 2 ? atoi(argv[2]) : 0;
221  uint8_t *orig = av_malloc(MAXSZ + 16);
222  uint8_t *comp = av_malloc(2*MAXSZ + 16);
223  uint8_t *decomp = av_malloc(MAXSZ + 16);
224  size_t s = fread(orig, 1, MAXSZ, in);
225  lzo_uint clen = 0;
226  long tmp[LZO1X_MEM_COMPRESS];
227  int inlen, outlen;
228  int i;
230  if (comp_level == 0) {
231  lzo1x_1_compress(orig, s, comp, &clen, tmp);
232  } else if (comp_level == 11) {
233  lzo1x_1_11_compress(orig, s, comp, &clen, tmp);
234  } else if (comp_level == 12) {
235  lzo1x_1_12_compress(orig, s, comp, &clen, tmp);
236  } else if (comp_level == 15) {
237  lzo1x_1_15_compress(orig, s, comp, &clen, tmp);
238  } else
239  lzo1x_999_compress(orig, s, comp, &clen, tmp);
240  for (i = 0; i < 300; i++) {
242  inlen = clen; outlen = MAXSZ;
243 #if BENCHMARK_LIBLZO_SAFE
244  if (lzo1x_decompress_safe(comp, inlen, decomp, &outlen, NULL))
245 #elif BENCHMARK_LIBLZO_UNSAFE
246  if (lzo1x_decompress(comp, inlen, decomp, &outlen, NULL))
247 #else
248  if (av_lzo1x_decode(decomp, &outlen, comp, &inlen))
249 #endif
250  av_log(NULL, AV_LOG_ERROR, "decompression error\n");
251 STOP_TIMER("lzod")
252  }
253  if (memcmp(orig, decomp, s))
254  av_log(NULL, AV_LOG_ERROR, "decompression incorrect\n");
255  else
256  av_log(NULL, AV_LOG_ERROR, "decompression OK\n");
257  return 0;
258 }
259 #endif