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source: vbox/trunk/src/libs/liblzma-5.4.1/common/common.c

Last change on this file was 98737, checked in by vboxsync, 21 months ago

lobs/liblzma-5.4.1: Windows build fixes, bugref:10254
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Line 
1///////////////////////////////////////////////////////////////////////////////
2//
3/// \file common.c
4/// \brief Common functions needed in many places in liblzma
5//
6// Author: Lasse Collin
7//
8// This file has been put into the public domain.
9// You can do whatever you want with this file.
10//
11///////////////////////////////////////////////////////////////////////////////
12
13#include "common.h"
14
15
16/////////////
17// Version //
18/////////////
19
20extern LZMA_API(uint32_t)
21lzma_version_number(void)
22{
23 return LZMA_VERSION;
24}
25
26
27extern LZMA_API(const char *)
28lzma_version_string(void)
29{
30 return LZMA_VERSION_STRING;
31}
32
33
34///////////////////////
35// Memory allocation //
36///////////////////////
37
38extern void * lzma_attribute((__malloc__)) lzma_attr_alloc_size(1)
39lzma_alloc(size_t size, const lzma_allocator *allocator)
40{
41 // Some malloc() variants return NULL if called with size == 0.
42 if (size == 0)
43 size = 1;
44
45 void *ptr;
46
47 if (allocator != NULL && allocator->alloc != NULL)
48 ptr = allocator->alloc(allocator->opaque, 1, size);
49 else
50#ifndef VBOX
51 ptr = malloc(size);
52#else
53 ptr = RTMemAlloc(size);
54#endif
55
56 return ptr;
57}
58
59
60extern void * lzma_attribute((__malloc__)) lzma_attr_alloc_size(1)
61lzma_alloc_zero(size_t size, const lzma_allocator *allocator)
62{
63 // Some calloc() variants return NULL if called with size == 0.
64 if (size == 0)
65 size = 1;
66
67 void *ptr;
68
69 if (allocator != NULL && allocator->alloc != NULL) {
70 ptr = allocator->alloc(allocator->opaque, 1, size);
71 if (ptr != NULL)
72 memzero(ptr, size);
73 } else {
74#ifndef VBOX
75 ptr = calloc(1, size);
76#else
77 ptr = RTMemAllocZ(size);
78#endif
79
80 }
81
82 return ptr;
83}
84
85
86extern void
87lzma_free(void *ptr, const lzma_allocator *allocator)
88{
89 if (allocator != NULL && allocator->free != NULL)
90 allocator->free(allocator->opaque, ptr);
91 else
92#ifndef VBOX
93 free(ptr);
94#else
95 RTMemFree(ptr);
96#endif
97
98 return;
99}
100
101
102//////////
103// Misc //
104//////////
105
106extern size_t
107lzma_bufcpy(const uint8_t *restrict in, size_t *restrict in_pos,
108 size_t in_size, uint8_t *restrict out,
109 size_t *restrict out_pos, size_t out_size)
110{
111 const size_t in_avail = in_size - *in_pos;
112 const size_t out_avail = out_size - *out_pos;
113 const size_t copy_size = my_min(in_avail, out_avail);
114
115 // Call memcpy() only if there is something to copy. If there is
116 // nothing to copy, in or out might be NULL and then the memcpy()
117 // call would trigger undefined behavior.
118 if (copy_size > 0)
119 memcpy(out + *out_pos, in + *in_pos, copy_size);
120
121 *in_pos += copy_size;
122 *out_pos += copy_size;
123
124 return copy_size;
125}
126
127
128extern lzma_ret
129lzma_next_filter_init(lzma_next_coder *next, const lzma_allocator *allocator,
130 const lzma_filter_info *filters)
131{
132 lzma_next_coder_init(filters[0].init, next, allocator);
133 next->id = filters[0].id;
134 return filters[0].init == NULL
135 ? LZMA_OK : filters[0].init(next, allocator, filters);
136}
137
138
139extern lzma_ret
140lzma_next_filter_update(lzma_next_coder *next, const lzma_allocator *allocator,
141 const lzma_filter *reversed_filters)
142{
143 // Check that the application isn't trying to change the Filter ID.
144 // End of filters is indicated with LZMA_VLI_UNKNOWN in both
145 // reversed_filters[0].id and next->id.
146 if (reversed_filters[0].id != next->id)
147 return LZMA_PROG_ERROR;
148
149 if (reversed_filters[0].id == LZMA_VLI_UNKNOWN)
150 return LZMA_OK;
151
152 assert(next->update != NULL);
153 return next->update(next->coder, allocator, NULL, reversed_filters);
154}
155
156
157extern void
158lzma_next_end(lzma_next_coder *next, const lzma_allocator *allocator)
159{
160 if (next->init != (uintptr_t)(NULL)) {
161 // To avoid tiny end functions that simply call
162 // lzma_free(coder, allocator), we allow leaving next->end
163 // NULL and call lzma_free() here.
164 if (next->end != NULL)
165 next->end(next->coder, allocator);
166 else
167 lzma_free(next->coder, allocator);
168
169 // Reset the variables so the we don't accidentally think
170 // that it is an already initialized coder.
171 *next = LZMA_NEXT_CODER_INIT;
172 }
173
174 return;
175}
176
177
178//////////////////////////////////////
179// External to internal API wrapper //
180//////////////////////////////////////
181
182extern lzma_ret
183lzma_strm_init(lzma_stream *strm)
184{
185 if (strm == NULL)
186 return LZMA_PROG_ERROR;
187
188 if (strm->internal == NULL) {
189 strm->internal = lzma_alloc(sizeof(lzma_internal),
190 strm->allocator);
191 if (strm->internal == NULL)
192 return LZMA_MEM_ERROR;
193
194 strm->internal->next = LZMA_NEXT_CODER_INIT;
195 }
196
197 memzero(strm->internal->supported_actions,
198 sizeof(strm->internal->supported_actions));
199 strm->internal->sequence = ISEQ_RUN;
200 strm->internal->allow_buf_error = false;
201
202 strm->total_in = 0;
203 strm->total_out = 0;
204
205 return LZMA_OK;
206}
207
208
209extern LZMA_API(lzma_ret)
210lzma_code(lzma_stream *strm, lzma_action action)
211{
212 // Sanity checks
213 if ((strm->next_in == NULL && strm->avail_in != 0)
214 || (strm->next_out == NULL && strm->avail_out != 0)
215 || strm->internal == NULL
216 || strm->internal->next.code == NULL
217 || (unsigned int)(action) > LZMA_ACTION_MAX
218 || !strm->internal->supported_actions[action])
219 return LZMA_PROG_ERROR;
220
221 // Check if unsupported members have been set to non-zero or non-NULL,
222 // which would indicate that some new feature is wanted.
223 if (strm->reserved_ptr1 != NULL
224 || strm->reserved_ptr2 != NULL
225 || strm->reserved_ptr3 != NULL
226 || strm->reserved_ptr4 != NULL
227 || strm->reserved_int2 != 0
228 || strm->reserved_int3 != 0
229 || strm->reserved_int4 != 0
230 || strm->reserved_enum1 != LZMA_RESERVED_ENUM
231 || strm->reserved_enum2 != LZMA_RESERVED_ENUM)
232 return LZMA_OPTIONS_ERROR;
233
234 switch (strm->internal->sequence) {
235 case ISEQ_RUN:
236 switch (action) {
237 case LZMA_RUN:
238 break;
239
240 case LZMA_SYNC_FLUSH:
241 strm->internal->sequence = ISEQ_SYNC_FLUSH;
242 break;
243
244 case LZMA_FULL_FLUSH:
245 strm->internal->sequence = ISEQ_FULL_FLUSH;
246 break;
247
248 case LZMA_FINISH:
249 strm->internal->sequence = ISEQ_FINISH;
250 break;
251
252 case LZMA_FULL_BARRIER:
253 strm->internal->sequence = ISEQ_FULL_BARRIER;
254 break;
255 }
256
257 break;
258
259 case ISEQ_SYNC_FLUSH:
260 // The same action must be used until we return
261 // LZMA_STREAM_END, and the amount of input must not change.
262 if (action != LZMA_SYNC_FLUSH
263 || strm->internal->avail_in != strm->avail_in)
264 return LZMA_PROG_ERROR;
265
266 break;
267
268 case ISEQ_FULL_FLUSH:
269 if (action != LZMA_FULL_FLUSH
270 || strm->internal->avail_in != strm->avail_in)
271 return LZMA_PROG_ERROR;
272
273 break;
274
275 case ISEQ_FINISH:
276 if (action != LZMA_FINISH
277 || strm->internal->avail_in != strm->avail_in)
278 return LZMA_PROG_ERROR;
279
280 break;
281
282 case ISEQ_FULL_BARRIER:
283 if (action != LZMA_FULL_BARRIER
284 || strm->internal->avail_in != strm->avail_in)
285 return LZMA_PROG_ERROR;
286
287 break;
288
289 case ISEQ_END:
290 return LZMA_STREAM_END;
291
292 case ISEQ_ERROR:
293 default:
294 return LZMA_PROG_ERROR;
295 }
296
297 size_t in_pos = 0;
298 size_t out_pos = 0;
299 lzma_ret ret = strm->internal->next.code(
300 strm->internal->next.coder, strm->allocator,
301 strm->next_in, &in_pos, strm->avail_in,
302 strm->next_out, &out_pos, strm->avail_out, action);
303
304 strm->next_in += in_pos;
305 strm->avail_in -= in_pos;
306 strm->total_in += in_pos;
307
308 strm->next_out += out_pos;
309 strm->avail_out -= out_pos;
310 strm->total_out += out_pos;
311
312 strm->internal->avail_in = strm->avail_in;
313
314 switch (ret) {
315 case LZMA_OK:
316 // Don't return LZMA_BUF_ERROR when it happens the first time.
317 // This is to avoid returning LZMA_BUF_ERROR when avail_out
318 // was zero but still there was no more data left to written
319 // to next_out.
320 if (out_pos == 0 && in_pos == 0) {
321 if (strm->internal->allow_buf_error)
322 ret = LZMA_BUF_ERROR;
323 else
324 strm->internal->allow_buf_error = true;
325 } else {
326 strm->internal->allow_buf_error = false;
327 }
328 break;
329
330 case LZMA_TIMED_OUT:
331 strm->internal->allow_buf_error = false;
332 ret = LZMA_OK;
333 break;
334
335 case LZMA_SEEK_NEEDED:
336 strm->internal->allow_buf_error = false;
337
338 // If LZMA_FINISH was used, reset it back to the
339 // LZMA_RUN-based state so that new input can be supplied
340 // by the application.
341 if (strm->internal->sequence == ISEQ_FINISH)
342 strm->internal->sequence = ISEQ_RUN;
343
344 break;
345
346 case LZMA_STREAM_END:
347 if (strm->internal->sequence == ISEQ_SYNC_FLUSH
348 || strm->internal->sequence == ISEQ_FULL_FLUSH
349 || strm->internal->sequence
350 == ISEQ_FULL_BARRIER)
351 strm->internal->sequence = ISEQ_RUN;
352 else
353 strm->internal->sequence = ISEQ_END;
354
355 // Fall through
356
357 case LZMA_NO_CHECK:
358 case LZMA_UNSUPPORTED_CHECK:
359 case LZMA_GET_CHECK:
360 case LZMA_MEMLIMIT_ERROR:
361 // Something else than LZMA_OK, but not a fatal error,
362 // that is, coding may be continued (except if ISEQ_END).
363 strm->internal->allow_buf_error = false;
364 break;
365
366 default:
367 // All the other errors are fatal; coding cannot be continued.
368 assert(ret != LZMA_BUF_ERROR);
369 strm->internal->sequence = ISEQ_ERROR;
370 break;
371 }
372
373 return ret;
374}
375
376
377extern LZMA_API(void)
378lzma_end(lzma_stream *strm)
379{
380 if (strm != NULL && strm->internal != NULL) {
381 lzma_next_end(&strm->internal->next, strm->allocator);
382 lzma_free(strm->internal, strm->allocator);
383 strm->internal = NULL;
384 }
385
386 return;
387}
388
389
390#ifdef HAVE_SYMBOL_VERSIONS_LINUX
391// This is for compatibility with binaries linked against liblzma that
392// has been patched with xz-5.2.2-compat-libs.patch from RHEL/CentOS 7.
393LZMA_SYMVER_API("lzma_get_progress@XZ_5.2.2",
394 void, lzma_get_progress_522)(lzma_stream *strm,
395 uint64_t *progress_in, uint64_t *progress_out) lzma_nothrow
396 __attribute__((__alias__("lzma_get_progress_52")));
397
398LZMA_SYMVER_API("lzma_get_progress@@XZ_5.2",
399 void, lzma_get_progress_52)(lzma_stream *strm,
400 uint64_t *progress_in, uint64_t *progress_out) lzma_nothrow;
401
402#define lzma_get_progress lzma_get_progress_52
403#endif
404extern LZMA_API(void)
405lzma_get_progress(lzma_stream *strm,
406 uint64_t *progress_in, uint64_t *progress_out)
407{
408 if (strm->internal->next.get_progress != NULL) {
409 strm->internal->next.get_progress(strm->internal->next.coder,
410 progress_in, progress_out);
411 } else {
412 *progress_in = strm->total_in;
413 *progress_out = strm->total_out;
414 }
415
416 return;
417}
418
419
420extern LZMA_API(lzma_check)
421lzma_get_check(const lzma_stream *strm)
422{
423 // Return LZMA_CHECK_NONE if we cannot know the check type.
424 // It's a bug in the application if this happens.
425 if (strm->internal->next.get_check == NULL)
426 return LZMA_CHECK_NONE;
427
428 return strm->internal->next.get_check(strm->internal->next.coder);
429}
430
431
432extern LZMA_API(uint64_t)
433lzma_memusage(const lzma_stream *strm)
434{
435 uint64_t memusage;
436 uint64_t old_memlimit;
437
438 if (strm == NULL || strm->internal == NULL
439 || strm->internal->next.memconfig == NULL
440 || strm->internal->next.memconfig(
441 strm->internal->next.coder,
442 &memusage, &old_memlimit, 0) != LZMA_OK)
443 return 0;
444
445 return memusage;
446}
447
448
449extern LZMA_API(uint64_t)
450lzma_memlimit_get(const lzma_stream *strm)
451{
452 uint64_t old_memlimit;
453 uint64_t memusage;
454
455 if (strm == NULL || strm->internal == NULL
456 || strm->internal->next.memconfig == NULL
457 || strm->internal->next.memconfig(
458 strm->internal->next.coder,
459 &memusage, &old_memlimit, 0) != LZMA_OK)
460 return 0;
461
462 return old_memlimit;
463}
464
465
466extern LZMA_API(lzma_ret)
467lzma_memlimit_set(lzma_stream *strm, uint64_t new_memlimit)
468{
469 // Dummy variables to simplify memconfig functions
470 uint64_t old_memlimit;
471 uint64_t memusage;
472
473 if (strm == NULL || strm->internal == NULL
474 || strm->internal->next.memconfig == NULL)
475 return LZMA_PROG_ERROR;
476
477 // Zero is a special value that cannot be used as an actual limit.
478 // If 0 was specified, use 1 instead.
479 if (new_memlimit == 0)
480 new_memlimit = 1;
481
482 return strm->internal->next.memconfig(strm->internal->next.coder,
483 &memusage, &old_memlimit, new_memlimit);
484}
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