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1/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
2/*
3Copyright (c) 2000,2001,2002,2003 ymnk, JCraft,Inc. All rights reserved.
4
5Redistribution and use in source and binary forms, with or without
6modification, are permitted provided that the following conditions are met:
7
8 1. Redistributions of source code must retain the above copyright notice,
9 this list of conditions and the following disclaimer.
10
11 2. Redistributions in binary form must reproduce the above copyright
12 notice, this list of conditions and the following disclaimer in
13 the documentation and/or other materials provided with the distribution.
14
15 3. The names of the authors may not be used to endorse or promote products
16 derived from this software without specific prior written permission.
17
18THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
19INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
21INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
22INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
24OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
25LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
26NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
27EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29/*
30 * This program is based on zlib-1.1.3, so all credit should go authors
31 * Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu)
32 * and contributors of zlib.
33 */
34
35package com.jcraft.jzlib;
36
37final class InfTree{
38
39 static final private int MANY=1440;
40
41 static final private int Z_OK=0;
42 static final private int Z_STREAM_END=1;
43 static final private int Z_NEED_DICT=2;
44 static final private int Z_ERRNO=-1;
45 static final private int Z_STREAM_ERROR=-2;
46 static final private int Z_DATA_ERROR=-3;
47 static final private int Z_MEM_ERROR=-4;
48 static final private int Z_BUF_ERROR=-5;
49 static final private int Z_VERSION_ERROR=-6;
50
51 static final int fixed_bl = 9;
52 static final int fixed_bd = 5;
53
54 static final int[] fixed_tl = {
55 96,7,256, 0,8,80, 0,8,16, 84,8,115,
56 82,7,31, 0,8,112, 0,8,48, 0,9,192,
57 80,7,10, 0,8,96, 0,8,32, 0,9,160,
58 0,8,0, 0,8,128, 0,8,64, 0,9,224,
59 80,7,6, 0,8,88, 0,8,24, 0,9,144,
60 83,7,59, 0,8,120, 0,8,56, 0,9,208,
61 81,7,17, 0,8,104, 0,8,40, 0,9,176,
62 0,8,8, 0,8,136, 0,8,72, 0,9,240,
63 80,7,4, 0,8,84, 0,8,20, 85,8,227,
64 83,7,43, 0,8,116, 0,8,52, 0,9,200,
65 81,7,13, 0,8,100, 0,8,36, 0,9,168,
66 0,8,4, 0,8,132, 0,8,68, 0,9,232,
67 80,7,8, 0,8,92, 0,8,28, 0,9,152,
68 84,7,83, 0,8,124, 0,8,60, 0,9,216,
69 82,7,23, 0,8,108, 0,8,44, 0,9,184,
70 0,8,12, 0,8,140, 0,8,76, 0,9,248,
71 80,7,3, 0,8,82, 0,8,18, 85,8,163,
72 83,7,35, 0,8,114, 0,8,50, 0,9,196,
73 81,7,11, 0,8,98, 0,8,34, 0,9,164,
74 0,8,2, 0,8,130, 0,8,66, 0,9,228,
75 80,7,7, 0,8,90, 0,8,26, 0,9,148,
76 84,7,67, 0,8,122, 0,8,58, 0,9,212,
77 82,7,19, 0,8,106, 0,8,42, 0,9,180,
78 0,8,10, 0,8,138, 0,8,74, 0,9,244,
79 80,7,5, 0,8,86, 0,8,22, 192,8,0,
80 83,7,51, 0,8,118, 0,8,54, 0,9,204,
81 81,7,15, 0,8,102, 0,8,38, 0,9,172,
82 0,8,6, 0,8,134, 0,8,70, 0,9,236,
83 80,7,9, 0,8,94, 0,8,30, 0,9,156,
84 84,7,99, 0,8,126, 0,8,62, 0,9,220,
85 82,7,27, 0,8,110, 0,8,46, 0,9,188,
86 0,8,14, 0,8,142, 0,8,78, 0,9,252,
87 96,7,256, 0,8,81, 0,8,17, 85,8,131,
88 82,7,31, 0,8,113, 0,8,49, 0,9,194,
89 80,7,10, 0,8,97, 0,8,33, 0,9,162,
90 0,8,1, 0,8,129, 0,8,65, 0,9,226,
91 80,7,6, 0,8,89, 0,8,25, 0,9,146,
92 83,7,59, 0,8,121, 0,8,57, 0,9,210,
93 81,7,17, 0,8,105, 0,8,41, 0,9,178,
94 0,8,9, 0,8,137, 0,8,73, 0,9,242,
95 80,7,4, 0,8,85, 0,8,21, 80,8,258,
96 83,7,43, 0,8,117, 0,8,53, 0,9,202,
97 81,7,13, 0,8,101, 0,8,37, 0,9,170,
98 0,8,5, 0,8,133, 0,8,69, 0,9,234,
99 80,7,8, 0,8,93, 0,8,29, 0,9,154,
100 84,7,83, 0,8,125, 0,8,61, 0,9,218,
101 82,7,23, 0,8,109, 0,8,45, 0,9,186,
102 0,8,13, 0,8,141, 0,8,77, 0,9,250,
103 80,7,3, 0,8,83, 0,8,19, 85,8,195,
104 83,7,35, 0,8,115, 0,8,51, 0,9,198,
105 81,7,11, 0,8,99, 0,8,35, 0,9,166,
106 0,8,3, 0,8,131, 0,8,67, 0,9,230,
107 80,7,7, 0,8,91, 0,8,27, 0,9,150,
108 84,7,67, 0,8,123, 0,8,59, 0,9,214,
109 82,7,19, 0,8,107, 0,8,43, 0,9,182,
110 0,8,11, 0,8,139, 0,8,75, 0,9,246,
111 80,7,5, 0,8,87, 0,8,23, 192,8,0,
112 83,7,51, 0,8,119, 0,8,55, 0,9,206,
113 81,7,15, 0,8,103, 0,8,39, 0,9,174,
114 0,8,7, 0,8,135, 0,8,71, 0,9,238,
115 80,7,9, 0,8,95, 0,8,31, 0,9,158,
116 84,7,99, 0,8,127, 0,8,63, 0,9,222,
117 82,7,27, 0,8,111, 0,8,47, 0,9,190,
118 0,8,15, 0,8,143, 0,8,79, 0,9,254,
119 96,7,256, 0,8,80, 0,8,16, 84,8,115,
120 82,7,31, 0,8,112, 0,8,48, 0,9,193,
121
122 80,7,10, 0,8,96, 0,8,32, 0,9,161,
123 0,8,0, 0,8,128, 0,8,64, 0,9,225,
124 80,7,6, 0,8,88, 0,8,24, 0,9,145,
125 83,7,59, 0,8,120, 0,8,56, 0,9,209,
126 81,7,17, 0,8,104, 0,8,40, 0,9,177,
127 0,8,8, 0,8,136, 0,8,72, 0,9,241,
128 80,7,4, 0,8,84, 0,8,20, 85,8,227,
129 83,7,43, 0,8,116, 0,8,52, 0,9,201,
130 81,7,13, 0,8,100, 0,8,36, 0,9,169,
131 0,8,4, 0,8,132, 0,8,68, 0,9,233,
132 80,7,8, 0,8,92, 0,8,28, 0,9,153,
133 84,7,83, 0,8,124, 0,8,60, 0,9,217,
134 82,7,23, 0,8,108, 0,8,44, 0,9,185,
135 0,8,12, 0,8,140, 0,8,76, 0,9,249,
136 80,7,3, 0,8,82, 0,8,18, 85,8,163,
137 83,7,35, 0,8,114, 0,8,50, 0,9,197,
138 81,7,11, 0,8,98, 0,8,34, 0,9,165,
139 0,8,2, 0,8,130, 0,8,66, 0,9,229,
140 80,7,7, 0,8,90, 0,8,26, 0,9,149,
141 84,7,67, 0,8,122, 0,8,58, 0,9,213,
142 82,7,19, 0,8,106, 0,8,42, 0,9,181,
143 0,8,10, 0,8,138, 0,8,74, 0,9,245,
144 80,7,5, 0,8,86, 0,8,22, 192,8,0,
145 83,7,51, 0,8,118, 0,8,54, 0,9,205,
146 81,7,15, 0,8,102, 0,8,38, 0,9,173,
147 0,8,6, 0,8,134, 0,8,70, 0,9,237,
148 80,7,9, 0,8,94, 0,8,30, 0,9,157,
149 84,7,99, 0,8,126, 0,8,62, 0,9,221,
150 82,7,27, 0,8,110, 0,8,46, 0,9,189,
151 0,8,14, 0,8,142, 0,8,78, 0,9,253,
152 96,7,256, 0,8,81, 0,8,17, 85,8,131,
153 82,7,31, 0,8,113, 0,8,49, 0,9,195,
154 80,7,10, 0,8,97, 0,8,33, 0,9,163,
155 0,8,1, 0,8,129, 0,8,65, 0,9,227,
156 80,7,6, 0,8,89, 0,8,25, 0,9,147,
157 83,7,59, 0,8,121, 0,8,57, 0,9,211,
158 81,7,17, 0,8,105, 0,8,41, 0,9,179,
159 0,8,9, 0,8,137, 0,8,73, 0,9,243,
160 80,7,4, 0,8,85, 0,8,21, 80,8,258,
161 83,7,43, 0,8,117, 0,8,53, 0,9,203,
162 81,7,13, 0,8,101, 0,8,37, 0,9,171,
163 0,8,5, 0,8,133, 0,8,69, 0,9,235,
164 80,7,8, 0,8,93, 0,8,29, 0,9,155,
165 84,7,83, 0,8,125, 0,8,61, 0,9,219,
166 82,7,23, 0,8,109, 0,8,45, 0,9,187,
167 0,8,13, 0,8,141, 0,8,77, 0,9,251,
168 80,7,3, 0,8,83, 0,8,19, 85,8,195,
169 83,7,35, 0,8,115, 0,8,51, 0,9,199,
170 81,7,11, 0,8,99, 0,8,35, 0,9,167,
171 0,8,3, 0,8,131, 0,8,67, 0,9,231,
172 80,7,7, 0,8,91, 0,8,27, 0,9,151,
173 84,7,67, 0,8,123, 0,8,59, 0,9,215,
174 82,7,19, 0,8,107, 0,8,43, 0,9,183,
175 0,8,11, 0,8,139, 0,8,75, 0,9,247,
176 80,7,5, 0,8,87, 0,8,23, 192,8,0,
177 83,7,51, 0,8,119, 0,8,55, 0,9,207,
178 81,7,15, 0,8,103, 0,8,39, 0,9,175,
179 0,8,7, 0,8,135, 0,8,71, 0,9,239,
180 80,7,9, 0,8,95, 0,8,31, 0,9,159,
181 84,7,99, 0,8,127, 0,8,63, 0,9,223,
182 82,7,27, 0,8,111, 0,8,47, 0,9,191,
183 0,8,15, 0,8,143, 0,8,79, 0,9,255
184 };
185 static final int[] fixed_td = {
186 80,5,1, 87,5,257, 83,5,17, 91,5,4097,
187 81,5,5, 89,5,1025, 85,5,65, 93,5,16385,
188 80,5,3, 88,5,513, 84,5,33, 92,5,8193,
189 82,5,9, 90,5,2049, 86,5,129, 192,5,24577,
190 80,5,2, 87,5,385, 83,5,25, 91,5,6145,
191 81,5,7, 89,5,1537, 85,5,97, 93,5,24577,
192 80,5,4, 88,5,769, 84,5,49, 92,5,12289,
193 82,5,13, 90,5,3073, 86,5,193, 192,5,24577
194 };
195
196 // Tables for deflate from PKZIP's appnote.txt.
197 static final int[] cplens = { // Copy lengths for literal codes 257..285
198 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
199 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0
200 };
201
202 // see note #13 above about 258
203 static final int[] cplext = { // Extra bits for literal codes 257..285
204 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
205 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 112, 112 // 112==invalid
206 };
207
208 static final int[] cpdist = { // Copy offsets for distance codes 0..29
209 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
210 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
211 8193, 12289, 16385, 24577
212 };
213
214 static final int[] cpdext = { // Extra bits for distance codes
215 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
216 7, 7, 8, 8, 9, 9, 10, 10, 11, 11,
217 12, 12, 13, 13};
218
219 // If BMAX needs to be larger than 16, then h and x[] should be uLong.
220 static final int BMAX=15; // maximum bit length of any code
221
222 int[] hn = null; // hufts used in space
223 int[] v = null; // work area for huft_build
224 int[] c = null; // bit length count table
225 int[] r = null; // table entry for structure assignment
226 int[] u = null; // table stack
227 int[] x = null; // bit offsets, then code stack
228
229 private int huft_build(int[] b, // code lengths in bits (all assumed <= BMAX)
230 int bindex,
231 int n, // number of codes (assumed <= 288)
232 int s, // number of simple-valued codes (0..s-1)
233 int[] d, // list of base values for non-simple codes
234 int[] e, // list of extra bits for non-simple codes
235 int[] t, // result: starting table
236 int[] m, // maximum lookup bits, returns actual
237 int[] hp,// space for trees
238 int[] hn,// hufts used in space
239 int[] v // working area: values in order of bit length
240 ){
241 // Given a list of code lengths and a maximum table size, make a set of
242 // tables to decode that set of codes. Return Z_OK on success, Z_BUF_ERROR
243 // if the given code set is incomplete (the tables are still built in this
244 // case), Z_DATA_ERROR if the input is invalid (an over-subscribed set of
245 // lengths), or Z_MEM_ERROR if not enough memory.
246
247 int a; // counter for codes of length k
248 int f; // i repeats in table every f entries
249 int g; // maximum code length
250 int h; // table level
251 int i; // counter, current code
252 int j; // counter
253 int k; // number of bits in current code
254 int l; // bits per table (returned in m)
255 int mask; // (1 << w) - 1, to avoid cc -O bug on HP
256 int p; // pointer into c[], b[], or v[]
257 int q; // points to current table
258 int w; // bits before this table == (l * h)
259 int xp; // pointer into x
260 int y; // number of dummy codes added
261 int z; // number of entries in current table
262
263 // Generate counts for each bit length
264
265 p = 0; i = n;
266 do {
267 c[b[bindex+p]]++; p++; i--; // assume all entries <= BMAX
268 }while(i!=0);
269
270 if(c[0] == n){ // null input--all zero length codes
271 t[0] = -1;
272 m[0] = 0;
273 return Z_OK;
274 }
275
276 // Find minimum and maximum length, bound *m by those
277 l = m[0];
278 for (j = 1; j <= BMAX; j++)
279 if(c[j]!=0) break;
280 k = j; // minimum code length
281 if(l < j){
282 l = j;
283 }
284 for (i = BMAX; i!=0; i--){
285 if(c[i]!=0) break;
286 }
287 g = i; // maximum code length
288 if(l > i){
289 l = i;
290 }
291 m[0] = l;
292
293 // Adjust last length count to fill out codes, if needed
294 for (y = 1 << j; j < i; j++, y <<= 1){
295 if ((y -= c[j]) < 0){
296 return Z_DATA_ERROR;
297 }
298 }
299 if ((y -= c[i]) < 0){
300 return Z_DATA_ERROR;
301 }
302 c[i] += y;
303
304 // Generate starting offsets into the value table for each length
305 x[1] = j = 0;
306 p = 1; xp = 2;
307 while (--i!=0) { // note that i == g from above
308 x[xp] = (j += c[p]);
309 xp++;
310 p++;
311 }
312
313 // Make a table of values in order of bit lengths
314 i = 0; p = 0;
315 do {
316 if ((j = b[bindex+p]) != 0){
317 v[x[j]++] = i;
318 }
319 p++;
320 }
321 while (++i < n);
322 n = x[g]; // set n to length of v
323
324 // Generate the Huffman codes and for each, make the table entries
325 x[0] = i = 0; // first Huffman code is zero
326 p = 0; // grab values in bit order
327 h = -1; // no tables yet--level -1
328 w = -l; // bits decoded == (l * h)
329 u[0] = 0; // just to keep compilers happy
330 q = 0; // ditto
331 z = 0; // ditto
332
333 // go through the bit lengths (k already is bits in shortest code)
334 for (; k <= g; k++){
335 a = c[k];
336 while (a--!=0){
337 // here i is the Huffman code of length k bits for value *p
338 // make tables up to required level
339 while (k > w + l){
340 h++;
341 w += l; // previous table always l bits
342 // compute minimum size table less than or equal to l bits
343 z = g - w;
344 z = (z > l) ? l : z; // table size upper limit
345 if((f=1<<(j=k-w))>a+1){ // try a k-w bit table
346 // too few codes for k-w bit table
347 f -= a + 1; // deduct codes from patterns left
348 xp = k;
349 if(j < z){
350 while (++j < z){ // try smaller tables up to z bits
351 if((f <<= 1) <= c[++xp])
352 break; // enough codes to use up j bits
353 f -= c[xp]; // else deduct codes from patterns
354 }
355 }
356 }
357 z = 1 << j; // table entries for j-bit table
358
359 // allocate new table
360 if (hn[0] + z > MANY){ // (note: doesn't matter for fixed)
361 return Z_DATA_ERROR; // overflow of MANY
362 }
363 u[h] = q = /*hp+*/ hn[0]; // DEBUG
364 hn[0] += z;
365
366 // connect to last table, if there is one
367 if(h!=0){
368 x[h]=i; // save pattern for backing up
369 r[0]=(byte)j; // bits in this table
370 r[1]=(byte)l; // bits to dump before this table
371 j=i>>>(w - l);
372 r[2] = (int)(q - u[h-1] - j); // offset to this table
373 System.arraycopy(r, 0, hp, (u[h-1]+j)*3, 3); // connect to last table
374 }
375 else{
376 t[0] = q; // first table is returned result
377 }
378 }
379
380 // set up table entry in r
381 r[1] = (byte)(k - w);
382 if (p >= n){
383 r[0] = 128 + 64; // out of values--invalid code
384 }
385 else if (v[p] < s){
386 r[0] = (byte)(v[p] < 256 ? 0 : 32 + 64); // 256 is end-of-block
387 r[2] = v[p++]; // simple code is just the value
388 }
389 else{
390 r[0]=(byte)(e[v[p]-s]+16+64); // non-simple--look up in lists
391 r[2]=d[v[p++] - s];
392 }
393
394 // fill code-like entries with r
395 f=1<<(k-w);
396 for (j=i>>>w;j<z;j+=f){
397 System.arraycopy(r, 0, hp, (q+j)*3, 3);
398 }
399
400 // backwards increment the k-bit code i
401 for (j = 1 << (k - 1); (i & j)!=0; j >>>= 1){
402 i ^= j;
403 }
404 i ^= j;
405
406 // backup over finished tables
407 mask = (1 << w) - 1; // needed on HP, cc -O bug
408 while ((i & mask) != x[h]){
409 h--; // don't need to update q
410 w -= l;
411 mask = (1 << w) - 1;
412 }
413 }
414 }
415 // Return Z_BUF_ERROR if we were given an incomplete table
416 return y != 0 && g != 1 ? Z_BUF_ERROR : Z_OK;
417 }
418
419 int inflate_trees_bits(int[] c, // 19 code lengths
420 int[] bb, // bits tree desired/actual depth
421 int[] tb, // bits tree result
422 int[] hp, // space for trees
423 ZStream z // for messages
424 ){
425 int result;
426 initWorkArea(19);
427 hn[0]=0;
428 result = huft_build(c, 0, 19, 19, null, null, tb, bb, hp, hn, v);
429
430 if(result == Z_DATA_ERROR){
431 z.msg = "oversubscribed dynamic bit lengths tree";
432 }
433 else if(result == Z_BUF_ERROR || bb[0] == 0){
434 z.msg = "incomplete dynamic bit lengths tree";
435 result = Z_DATA_ERROR;
436 }
437 return result;
438 }
439
440 int inflate_trees_dynamic(int nl, // number of literal/length codes
441 int nd, // number of distance codes
442 int[] c, // that many (total) code lengths
443 int[] bl, // literal desired/actual bit depth
444 int[] bd, // distance desired/actual bit depth
445 int[] tl, // literal/length tree result
446 int[] td, // distance tree result
447 int[] hp, // space for trees
448 ZStream z // for messages
449 ){
450 int result;
451
452 // build literal/length tree
453 initWorkArea(288);
454 hn[0]=0;
455 result = huft_build(c, 0, nl, 257, cplens, cplext, tl, bl, hp, hn, v);
456 if (result != Z_OK || bl[0] == 0){
457 if(result == Z_DATA_ERROR){
458 z.msg = "oversubscribed literal/length tree";
459 }
460 else if (result != Z_MEM_ERROR){
461 z.msg = "incomplete literal/length tree";
462 result = Z_DATA_ERROR;
463 }
464 return result;
465 }
466
467 // build distance tree
468 initWorkArea(288);
469 result = huft_build(c, nl, nd, 0, cpdist, cpdext, td, bd, hp, hn, v);
470
471 if (result != Z_OK || (bd[0] == 0 && nl > 257)){
472 if (result == Z_DATA_ERROR){
473 z.msg = "oversubscribed distance tree";
474 }
475 else if (result == Z_BUF_ERROR) {
476 z.msg = "incomplete distance tree";
477 result = Z_DATA_ERROR;
478 }
479 else if (result != Z_MEM_ERROR){
480 z.msg = "empty distance tree with lengths";
481 result = Z_DATA_ERROR;
482 }
483 return result;
484 }
485
486 return Z_OK;
487 }
488
489 static int inflate_trees_fixed(int[] bl, //literal desired/actual bit depth
490 int[] bd, //distance desired/actual bit depth
491 int[][] tl,//literal/length tree result
492 int[][] td,//distance tree result
493 ZStream z //for memory allocation
494 ){
495 bl[0]=fixed_bl;
496 bd[0]=fixed_bd;
497 tl[0]=fixed_tl;
498 td[0]=fixed_td;
499 return Z_OK;
500 }
501
502 private void initWorkArea(int vsize){
503 if(hn==null){
504 hn=new int[1];
505 v=new int[vsize];
506 c=new int[BMAX+1];
507 r=new int[3];
508 u=new int[BMAX];
509 x=new int[BMAX+1];
510 }
511 if(v.length<vsize){ v=new int[vsize]; }
512 for(int i=0; i<vsize; i++){v[i]=0;}
513 for(int i=0; i<BMAX+1; i++){c[i]=0;}
514 for(int i=0; i<3; i++){r[i]=0;}
515// for(int i=0; i<BMAX; i++){u[i]=0;}
516 System.arraycopy(c, 0, u, 0, BMAX);
517// for(int i=0; i<BMAX+1; i++){x[i]=0;}
518 System.arraycopy(c, 0, x, 0, BMAX+1);
519 }
520}
A small image uploader for Android accessible by 'Share' (or, how not to write Android code).
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