aboutsummaryrefslogtreecommitdiff
path: root/fastjar/compress.c
blob: e88eff5ee4a28c7356a70445bed63509528901aa (plain)
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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
/* $Id: compress.c,v 1.1 2000/12/09 03:08:23 apbianco Exp $

   $Log: compress.c,v $
   Revision 1.1  2000/12/09 03:08:23  apbianco
   2000-12-08  Alexandre Petit-Bianco  <apbianco@cygnus.com>

           * fastjar: Imported.

   Revision 1.7  2000/09/13 14:02:02  cory
   Reformatted some of the code to more closly match the layout of the orriginal
   fastjar utility.

   Revision 1.6  2000/09/12 22:29:36  cory
   Jargrep now seems to do what I want it to do.  Performs properly on Linux x86,
   will test some other platforms later.

   Revision 1.1.1.1  1999/12/06 03:09:16  toast
   initial checkin..



   Revision 1.7  1999/05/10 08:50:05  burnsbr
   *** empty log message ***

   Revision 1.6  1999/05/10 08:38:44  burnsbr
   *** empty log message ***

   Revision 1.5  1999/05/10 08:30:29  burnsbr
   added inflation code

   Revision 1.4  1999/04/27 10:03:33  burnsbr
   added configure support

   Revision 1.3  1999/04/26 02:35:32  burnsbr
   compression now works.. yahoo

   Revision 1.2  1999/04/23 12:01:59  burnsbr
   added licence stuff.

   Revision 1.1  1999/04/23 11:58:25  burnsbr
   Initial revision


*/

/*
  compress.c - code for handling deflation
  Copyright (C) 1999  Bryan Burns
  
  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
  as published by the Free Software Foundation; either version 2
  of the License, or (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include "config.h"

#include <zlib.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif

#include <sys/types.h>

#include "jartool.h"
#include "pushback.h"
#include "compress.h"

extern int seekable;

static z_stream zs;

void init_compression(){

  memset(&zs, 0, sizeof(z_stream));

  zs.zalloc = Z_NULL;
  zs.zfree = Z_NULL;
  zs.opaque = Z_NULL;

  /* Why -MAX_WBITS?  zlib has an undocumented feature, where if the windowbits
     parameter is negative, it omits the zlib header, which seems to kill
     any other zip/unzip program.  This caused me SO much pain.. */
  if(deflateInit2(&zs, Z_DEFAULT_COMPRESSION, Z_DEFLATED, -MAX_WBITS, 
                  9, Z_DEFAULT_STRATEGY) != Z_OK){
    
    fprintf(stderr, "Error initializing deflation!\n");
    exit(1);
  }
}

int compress_file(int in_fd, int out_fd, struct zipentry *ze){
  Bytef in_buff[RDSZ];
  Bytef out_buff[RDSZ];
  unsigned int rdamt, wramt;
  unsigned long tr = 0;

  rdamt = 0;

  zs.avail_in = 0;
  zs.next_in = in_buff;
  
  zs.next_out = out_buff;
  zs.avail_out = (uInt)RDSZ;
  
  ze->crc = crc32(0L, Z_NULL, 0); 
  
  for(; ;){
    
    /* If deflate is out of input, fill the input buffer for it */
    if(zs.avail_in == 0 && zs.avail_out > 0){
      if((rdamt = read(in_fd, in_buff, RDSZ)) == 0)
        break;

      if(rdamt == -1){
        perror("read");
        exit(1);
      }
      
      /* compute the CRC while we're at it */
      ze->crc = crc32(ze->crc, in_buff, rdamt); 

      /* update the total amount read sofar */
      tr += rdamt;

      zs.next_in = in_buff;
      zs.avail_in = rdamt;
    }
    
    /* deflate the data */
    if(deflate(&zs, 0) != Z_OK){
      fprintf(stderr, "Error deflating! %s:%d\n", __FILE__, __LINE__);
      exit(1);
    }
    
    /* If the output buffer is full, dump it to disk */
    if(zs.avail_out == 0){

      if(write(out_fd, out_buff, RDSZ) != RDSZ){
        perror("write");
        exit(1);
      }

      /* clear the output buffer */
      zs.next_out = out_buff;
      zs.avail_out = (uInt)RDSZ;
    }

  }
  
  /* If we have any data waiting in the buffer after we're done with the file
     we can flush it */
  if(zs.avail_out < RDSZ){

    wramt = RDSZ - zs.avail_out;

    if(write(out_fd, out_buff, wramt) != wramt){
      perror("write");
      exit(1);
    }
    /* clear the output buffer */
    zs.next_out = out_buff;
    zs.avail_out = (uInt)RDSZ;
  }
  

  /* finish deflation.  This purges zlib's internal data buffers */
  while(deflate(&zs, Z_FINISH) == Z_OK){
    wramt = RDSZ - zs.avail_out;

    if(write(out_fd, out_buff, wramt) != wramt){
      perror("write");
      exit(1);
    }

    zs.next_out = out_buff;
    zs.avail_out = (uInt)RDSZ;
  }

  /* If there's any data left in the buffer, write it out */
  if(zs.avail_out != RDSZ){
    wramt = RDSZ - zs.avail_out;

    if(write(out_fd, out_buff, wramt) != wramt){
      perror("write");
      exit(1);
    }
  }

  /* update fastjar's entry information */
  ze->usize = (ub4)zs.total_in;
  ze->csize = (ub4)zs.total_out;

  /* Reset the deflation for the next time around */
  if(deflateReset(&zs) != Z_OK){
    fprintf(stderr, "Error resetting deflation\n");
    exit(1);
  }
  
  return 0;
}

void end_compression(){
  int rtval;

  /* Oddly enough, zlib always returns Z_DATA_ERROR if you specify no
     zlib header.  Go fig. */
  if((rtval = deflateEnd(&zs)) != Z_OK && rtval != Z_DATA_ERROR){
    fprintf(stderr, "Error calling deflateEnd\n");
    fprintf(stderr, "error: (%d) %s\n", rtval, zs.msg);
    exit(1);
  }
}


void init_inflation(){

  memset(&zs, 0, sizeof(z_stream));
    
  zs.zalloc = Z_NULL;
  zs.zfree = Z_NULL;
  zs.opaque = Z_NULL;
  
  if(inflateInit2(&zs, -15) != Z_OK){
    fprintf(stderr, "Error initializing deflation!\n");
    exit(1);
  }

}

int inflate_file(pb_file *pbf, int out_fd, struct zipentry *ze){
  Bytef in_buff[RDSZ];
  Bytef out_buff[RDSZ];
  unsigned int rdamt;
  int rtval;
  ub4 crc = 0;

  zs.avail_in = 0;

  crc = crc32(crc, NULL, 0); /* initialize crc */

  /* loop until we've consumed all the compressed data */
  for(;;){
    
    if(zs.avail_in == 0){
      if((rdamt = pb_read(pbf, in_buff, RDSZ)) == 0)
        break;
      else if(rdamt < 0){
        perror("read");
        exit(1);
      }

#ifdef DEBUG
      printf("%d bytes read\n", rdamt);
#endif

      zs.next_in = in_buff;
      zs.avail_in = rdamt;
    }

    zs.next_out = out_buff;
    zs.avail_out = RDSZ;
    
    if((rtval = inflate(&zs, 0)) != Z_OK){
      if(rtval == Z_STREAM_END){
#ifdef DEBUG
        printf("end of stream\n");
#endif
        if(zs.avail_out != RDSZ){
          crc = crc32(crc, out_buff, (RDSZ - zs.avail_out));

          if(out_fd >= 0)
            if(write(out_fd, out_buff, (RDSZ - zs.avail_out)) != 
               (RDSZ - zs.avail_out)){
              perror("write");
              exit(1);
            }
        }
        
        break;
      } else {
        fprintf(stderr, "Error inflating file! (%d)\n", rtval);
        exit(1);
      }
    } else {
      if(zs.avail_out != RDSZ){
        crc = crc32(crc, out_buff, (RDSZ - zs.avail_out));

        if(out_fd >= 0)
          if(write(out_fd, out_buff, (RDSZ - zs.avail_out)) != 
             (RDSZ - zs.avail_out)){
            perror("write");
            exit(1);
          }
        zs.next_out = out_buff;
        zs.avail_out = RDSZ;
      }
    }
  }
#ifdef DEBUG
  printf("done inflating\n");
#endif

#ifdef DEBUG
  printf("%d bytes left over\n", zs.avail_in);
#endif

#ifdef DEBUG    
  printf("CRC is %x\n", crc);
#endif

  ze->crc = crc;
  
  pb_push(pbf, zs.next_in, zs.avail_in);

  ze->usize = zs.total_out;

  inflateReset(&zs);
  return 0;
}

/*
Function name: report_str_error
args:	val	Error code returned from zlib.
purpose: Put out an error message corresponding to error code returned from zlib.
Be suitably cryptic seeing I don't really know exactly what these errors mean.
*/

static void report_str_error(int val) {
	switch(val) {
	case Z_STREAM_END:
		break;
	case Z_NEED_DICT:
		fprintf(stderr, "Need a dictionary?\n");
		exit(1);
	case Z_DATA_ERROR:
		fprintf(stderr, "Z_DATA_ERROR\n");
		exit(1);
	case Z_STREAM_ERROR:
		fprintf(stderr, "Z_STREAM_ERROR\n");
		exit(1);
	case Z_MEM_ERROR:
		fprintf(stderr, "Z_MEM_ERROR\n");
		exit(1);
	case Z_BUF_ERROR:
		fprintf(stderr, "Z_BUF_ERROR\n");
		exit(1);
	case Z_OK:
		break;
	default:
		fprintf(stderr, "Unknown behavior from inflate\n");
		exit(1);
	}
}

/*
Function name: ez_inflate_str
args:	pbf		Pointer to pushback handle for file.
		csize	Compressed size of embedded file.
		usize	Uncompressed size of embedded file.
purpose: Read in and decompress the contents of an embedded file and store it in a
byte array.
returns: Byte array of uncompressed embedded file.
*/

static Bytef *ez_inflate_str(pb_file *pbf, ub4 csize, ub4 usize) {
	Bytef *out_buff;
	Bytef *in_buff;
	unsigned int rdamt;

	if((zs.next_in = in_buff = (Bytef *) malloc(csize))) {
		if((zs.next_out = out_buff = (Bytef *) malloc(usize + 1))) { 
			if((rdamt = pb_read(pbf, zs.next_in, csize)) == csize) {
				zs.avail_in = csize;
				zs.avail_out = usize;
				report_str_error(inflate(&zs, 0));
				free(in_buff);
				inflateReset(&zs);
				out_buff[usize] = '\0';
			}
			else {
				fprintf(stderr, "Read failed on input file.\n");
				fprintf(stderr, "Tried to read %u but read %u instead.\n", csize, rdamt);
				free(in_buff);
				free(out_buff);
				exit(1);
			}
		}
		else {
			fprintf(stderr, "Malloc of out_buff failed.\n");
			fprintf(stderr, "Error: %s\n", strerror(errno));
			free(in_buff);
			exit(1);
		}
	}
	else {
		fprintf(stderr, "Malloc of in_buff failed.\n");
		fprintf(stderr, "Error: %s\n", strerror(errno));
		exit(1);
	}

	return out_buff;
}

/*
Function name: hrd_inflate_str
args:	pbf		Pointer to pushback handle for file.
		csize	Pointer to compressed size of embedded file.
		usize	Pointer to uncompressed size of embedded file.
purpose: Read and decompress an embedded file into a string.  Set csize and usize
accordingly.  This function does the reading for us in the case there is not size
information in the header for the embedded file.
returns: Byte array of the contents of the embedded file.
*/

static Bytef *hrd_inflate_str(pb_file *pbf, ub4 *csize, ub4 *usize) {
	Bytef *out_buff;
	Bytef *tmp;
	Bytef in_buff[RDSZ];
	unsigned int rdamt;
	int i;
	int zret;

	i = 1; 
	out_buff = NULL;
	zret = Z_OK;
	while(zret != Z_STREAM_END && (rdamt = pb_read(pbf, in_buff, RDSZ)))
	{
		zs.avail_in = rdamt;
		zs.avail_out = 0;
		zs.next_in = in_buff;
		do {
			if((tmp = (Bytef *) realloc(out_buff, (RDSZ * i) + 1))) {
				out_buff = tmp;
				zs.next_out = &(out_buff[(RDSZ * (i - 1)) - zs.avail_out]);
				zs.avail_out += RDSZ;
				i++;
			}
			else {
				fprintf(stderr, "Realloc of out_buff failed.\n");
				fprintf(stderr, "Error: %s\n", strerror(errno));
				exit(1);
			}
		} while((zret = inflate(&zs, 0)) == Z_OK);
		report_str_error(zret);
	}
	pb_push(pbf, zs.next_in, zs.avail_in);

	out_buff[(RDSZ * (i - 1)) - zs.avail_out] = '\0';
	*usize = zs.total_out;
	*csize = zs.total_in;

	inflateReset(&zs);

	return out_buff;
}

/*
Function name: inflate_string
args:	pbf		Pointer to pushback handle for file.
		csize	Pointer to compressed size of embedded file.  May be 0 if not set.
		usize	Pointer to uncompressed size of embedded file. May be 0 if not set.
purpose: Decide the easiest (in computer terms) methos of decompressing this embedded
file to a string.
returns: Pointer to a string containing the decompressed contents of the embedded file.
If csize and usize are not set set them to correct numbers.
*/

Bytef *inflate_string(pb_file *pbf, ub4 *csize, ub4 *usize) {
Bytef *ret_buf;

	if(*csize && *usize) ret_buf = ez_inflate_str(pbf, *csize, *usize);
	else ret_buf = hrd_inflate_str(pbf, csize, usize);

	return ret_buf;
}