Mercurial > hg > CbC > CbC_gcc
annotate zlib/examples/zran.c @ 101:5c3ad79fc15b
modify implemeted __rectype expression
author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
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date | Thu, 16 Feb 2012 18:15:22 +0900 |
parents | ae3a4bfb450b |
children | 04ced10e8804 |
rev | line source |
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1 /* zran.c -- example of zlib/gzip stream indexing and random access |
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2 * Copyright (C) 2005 Mark Adler |
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3 * For conditions of distribution and use, see copyright notice in zlib.h |
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4 Version 1.0 29 May 2005 Mark Adler */ |
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5 |
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6 /* Illustrate the use of Z_BLOCK, inflatePrime(), and inflateSetDictionary() |
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7 for random access of a compressed file. A file containing a zlib or gzip |
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8 stream is provided on the command line. The compressed stream is decoded in |
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9 its entirety, and an index built with access points about every SPAN bytes |
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10 in the uncompressed output. The compressed file is left open, and can then |
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11 be read randomly, having to decompress on the average SPAN/2 uncompressed |
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12 bytes before getting to the desired block of data. |
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13 |
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14 An access point can be created at the start of any deflate block, by saving |
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15 the starting file offset and bit of that block, and the 32K bytes of |
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16 uncompressed data that precede that block. Also the uncompressed offset of |
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17 that block is saved to provide a referece for locating a desired starting |
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18 point in the uncompressed stream. build_index() works by decompressing the |
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19 input zlib or gzip stream a block at a time, and at the end of each block |
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20 deciding if enough uncompressed data has gone by to justify the creation of |
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21 a new access point. If so, that point is saved in a data structure that |
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22 grows as needed to accommodate the points. |
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23 |
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24 To use the index, an offset in the uncompressed data is provided, for which |
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25 the latest accees point at or preceding that offset is located in the index. |
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26 The input file is positioned to the specified location in the index, and if |
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27 necessary the first few bits of the compressed data is read from the file. |
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28 inflate is initialized with those bits and the 32K of uncompressed data, and |
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29 the decompression then proceeds until the desired offset in the file is |
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30 reached. Then the decompression continues to read the desired uncompressed |
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31 data from the file. |
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32 |
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33 Another approach would be to generate the index on demand. In that case, |
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34 requests for random access reads from the compressed data would try to use |
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35 the index, but if a read far enough past the end of the index is required, |
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36 then further index entries would be generated and added. |
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37 |
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38 There is some fair bit of overhead to starting inflation for the random |
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39 access, mainly copying the 32K byte dictionary. So if small pieces of the |
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40 file are being accessed, it would make sense to implement a cache to hold |
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41 some lookahead and avoid many calls to extract() for small lengths. |
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42 |
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43 Another way to build an index would be to use inflateCopy(). That would |
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44 not be constrained to have access points at block boundaries, but requires |
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45 more memory per access point, and also cannot be saved to file due to the |
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46 use of pointers in the state. The approach here allows for storage of the |
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47 index in a file. |
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48 */ |
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49 |
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50 #include <stdio.h> |
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51 #include <stdlib.h> |
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52 #include <string.h> |
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53 #include "zlib.h" |
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54 |
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55 #define local static |
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56 |
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57 #define SPAN 1048576L /* desired distance between access points */ |
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58 #define WINSIZE 32768U /* sliding window size */ |
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59 #define CHUNK 16384 /* file input buffer size */ |
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60 |
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61 /* access point entry */ |
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62 struct point { |
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63 off_t out; /* corresponding offset in uncompressed data */ |
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64 off_t in; /* offset in input file of first full byte */ |
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65 int bits; /* number of bits (1-7) from byte at in - 1, or 0 */ |
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66 unsigned char window[WINSIZE]; /* preceding 32K of uncompressed data */ |
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67 }; |
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68 |
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69 /* access point list */ |
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70 struct access { |
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71 int have; /* number of list entries filled in */ |
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72 int size; /* number of list entries allocated */ |
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73 struct point *list; /* allocated list */ |
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74 }; |
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75 |
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76 /* Deallocate an index built by build_index() */ |
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77 local void free_index(struct access *index) |
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78 { |
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79 if (index != NULL) { |
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80 free(index->list); |
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81 free(index); |
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82 } |
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83 } |
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84 |
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85 /* Add an entry to the access point list. If out of memory, deallocate the |
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86 existing list and return NULL. */ |
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87 local struct access *addpoint(struct access *index, int bits, |
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88 off_t in, off_t out, unsigned left, unsigned char *window) |
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89 { |
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90 struct point *next; |
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91 |
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92 /* if list is empty, create it (start with eight points) */ |
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93 if (index == NULL) { |
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94 index = malloc(sizeof(struct access)); |
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95 if (index == NULL) return NULL; |
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96 index->list = malloc(sizeof(struct point) << 3); |
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97 if (index->list == NULL) { |
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98 free(index); |
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99 return NULL; |
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100 } |
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101 index->size = 8; |
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102 index->have = 0; |
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103 } |
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104 |
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105 /* if list is full, make it bigger */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
106 else if (index->have == index->size) { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
107 index->size <<= 1; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
108 next = realloc(index->list, sizeof(struct point) * index->size); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
109 if (next == NULL) { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
110 free_index(index); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
111 return NULL; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
112 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
113 index->list = next; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
114 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
115 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
116 /* fill in entry and increment how many we have */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
117 next = index->list + index->have; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
118 next->bits = bits; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
119 next->in = in; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
120 next->out = out; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
121 if (left) |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
122 memcpy(next->window, window + WINSIZE - left, left); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
123 if (left < WINSIZE) |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
124 memcpy(next->window + left, window, WINSIZE - left); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
125 index->have++; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
126 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
127 /* return list, possibly reallocated */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
128 return index; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
129 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
130 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
131 /* Make one entire pass through the compressed stream and build an index, with |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
132 access points about every span bytes of uncompressed output -- span is |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
133 chosen to balance the speed of random access against the memory requirements |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
134 of the list, about 32K bytes per access point. Note that data after the end |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
135 of the first zlib or gzip stream in the file is ignored. build_index() |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
136 returns the number of access points on success (>= 1), Z_MEM_ERROR for out |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
137 of memory, Z_DATA_ERROR for an error in the input file, or Z_ERRNO for a |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
138 file read error. On success, *built points to the resulting index. */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
139 local int build_index(FILE *in, off_t span, struct access **built) |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
140 { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
141 int ret; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
142 off_t totin, totout; /* our own total counters to avoid 4GB limit */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
143 off_t last; /* totout value of last access point */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
144 struct access *index; /* access points being generated */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
145 z_stream strm; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
146 unsigned char input[CHUNK]; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
147 unsigned char window[WINSIZE]; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
148 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
149 /* initialize inflate */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
150 strm.zalloc = Z_NULL; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
151 strm.zfree = Z_NULL; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
152 strm.opaque = Z_NULL; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
153 strm.avail_in = 0; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
154 strm.next_in = Z_NULL; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
155 ret = inflateInit2(&strm, 47); /* automatic zlib or gzip decoding */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
156 if (ret != Z_OK) |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
157 return ret; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
158 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
159 /* inflate the input, maintain a sliding window, and build an index -- this |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
160 also validates the integrity of the compressed data using the check |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
161 information at the end of the gzip or zlib stream */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
162 totin = totout = last = 0; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
163 index = NULL; /* will be allocated by first addpoint() */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
164 strm.avail_out = 0; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
165 do { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
166 /* get some compressed data from input file */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
167 strm.avail_in = fread(input, 1, CHUNK, in); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
168 if (ferror(in)) { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
169 ret = Z_ERRNO; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
170 goto build_index_error; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
171 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
172 if (strm.avail_in == 0) { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
173 ret = Z_DATA_ERROR; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
174 goto build_index_error; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
175 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
176 strm.next_in = input; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
177 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
178 /* process all of that, or until end of stream */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
179 do { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
180 /* reset sliding window if necessary */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
181 if (strm.avail_out == 0) { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
182 strm.avail_out = WINSIZE; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
183 strm.next_out = window; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
184 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
185 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
186 /* inflate until out of input, output, or at end of block -- |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
187 update the total input and output counters */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
188 totin += strm.avail_in; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
189 totout += strm.avail_out; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
190 ret = inflate(&strm, Z_BLOCK); /* return at end of block */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
191 totin -= strm.avail_in; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
192 totout -= strm.avail_out; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
193 if (ret == Z_NEED_DICT) |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
194 ret = Z_DATA_ERROR; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
195 if (ret == Z_MEM_ERROR || ret == Z_DATA_ERROR) |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
196 goto build_index_error; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
197 if (ret == Z_STREAM_END) |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
198 break; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
199 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
200 /* if at end of block, consider adding an index entry (note that if |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
201 data_type indicates an end-of-block, then all of the |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
202 uncompressed data from that block has been delivered, and none |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
203 of the compressed data after that block has been consumed, |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
204 except for up to seven bits) -- the totout == 0 provides an |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
205 entry point after the zlib or gzip header, and assures that the |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
206 index always has at least one access point; we avoid creating an |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
207 access point after the last block by checking bit 6 of data_type |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
208 */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
209 if ((strm.data_type & 128) && !(strm.data_type & 64) && |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
210 (totout == 0 || totout - last > span)) { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
211 index = addpoint(index, strm.data_type & 7, totin, |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
212 totout, strm.avail_out, window); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
213 if (index == NULL) { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
214 ret = Z_MEM_ERROR; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
215 goto build_index_error; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
216 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
217 last = totout; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
218 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
219 } while (strm.avail_in != 0); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
220 } while (ret != Z_STREAM_END); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
221 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
222 /* clean up and return index (release unused entries in list) */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
223 (void)inflateEnd(&strm); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
224 index = realloc(index, sizeof(struct point) * index->have); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
225 index->size = index->have; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
226 *built = index; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
227 return index->size; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
228 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
229 /* return error */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
230 build_index_error: |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
231 (void)inflateEnd(&strm); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
232 if (index != NULL) |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
233 free_index(index); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
234 return ret; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
235 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
236 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
237 /* Use the index to read len bytes from offset into buf, return bytes read or |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
238 negative for error (Z_DATA_ERROR or Z_MEM_ERROR). If data is requested past |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
239 the end of the uncompressed data, then extract() will return a value less |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
240 than len, indicating how much as actually read into buf. This function |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
241 should not return a data error unless the file was modified since the index |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
242 was generated. extract() may also return Z_ERRNO if there is an error on |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
243 reading or seeking the input file. */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
244 local int extract(FILE *in, struct access *index, off_t offset, |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
245 unsigned char *buf, int len) |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
246 { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
247 int ret, skip; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
248 z_stream strm; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
249 struct point *here; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
250 unsigned char input[CHUNK]; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
251 unsigned char discard[WINSIZE]; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
252 |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
253 /* proceed only if something reasonable to do */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
254 if (len < 0) |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
255 return 0; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
256 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
257 /* find where in stream to start */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
258 here = index->list; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
259 ret = index->have; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
260 while (--ret && here[1].out <= offset) |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
261 here++; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
262 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
263 /* initialize file and inflate state to start there */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
264 strm.zalloc = Z_NULL; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
265 strm.zfree = Z_NULL; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
266 strm.opaque = Z_NULL; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
267 strm.avail_in = 0; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
268 strm.next_in = Z_NULL; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
269 ret = inflateInit2(&strm, -15); /* raw inflate */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
270 if (ret != Z_OK) |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
271 return ret; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
272 ret = fseeko(in, here->in - (here->bits ? 1 : 0), SEEK_SET); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
273 if (ret == -1) |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
274 goto extract_ret; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
275 if (here->bits) { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
276 ret = getc(in); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
277 if (ret == -1) { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
278 ret = ferror(in) ? Z_ERRNO : Z_DATA_ERROR; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
279 goto extract_ret; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
280 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
281 (void)inflatePrime(&strm, here->bits, ret >> (8 - here->bits)); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
282 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
283 (void)inflateSetDictionary(&strm, here->window, WINSIZE); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
284 |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
285 /* skip uncompressed bytes until offset reached, then satisfy request */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
286 offset -= here->out; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
287 strm.avail_in = 0; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
288 skip = 1; /* while skipping to offset */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
289 do { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
290 /* define where to put uncompressed data, and how much */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
291 if (offset == 0 && skip) { /* at offset now */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
292 strm.avail_out = len; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
293 strm.next_out = buf; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
294 skip = 0; /* only do this once */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
295 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
296 if (offset > WINSIZE) { /* skip WINSIZE bytes */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
297 strm.avail_out = WINSIZE; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
298 strm.next_out = discard; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
299 offset -= WINSIZE; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
300 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
301 else if (offset != 0) { /* last skip */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
302 strm.avail_out = (unsigned)offset; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
303 strm.next_out = discard; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
304 offset = 0; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
305 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
306 |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
307 /* uncompress until avail_out filled, or end of stream */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
308 do { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
309 if (strm.avail_in == 0) { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
310 strm.avail_in = fread(input, 1, CHUNK, in); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
311 if (ferror(in)) { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
312 ret = Z_ERRNO; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
313 goto extract_ret; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
314 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
315 if (strm.avail_in == 0) { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
316 ret = Z_DATA_ERROR; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
317 goto extract_ret; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
318 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
319 strm.next_in = input; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
320 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
321 ret = inflate(&strm, Z_NO_FLUSH); /* normal inflate */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
322 if (ret == Z_NEED_DICT) |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
323 ret = Z_DATA_ERROR; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
324 if (ret == Z_MEM_ERROR || ret == Z_DATA_ERROR) |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
325 goto extract_ret; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
326 if (ret == Z_STREAM_END) |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
327 break; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
328 } while (strm.avail_out != 0); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
329 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
330 /* if reach end of stream, then don't keep trying to get more */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
331 if (ret == Z_STREAM_END) |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
332 break; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
333 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
334 /* do until offset reached and requested data read, or stream ends */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
335 } while (skip); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
336 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
337 /* compute number of uncompressed bytes read after offset */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
338 ret = skip ? 0 : len - strm.avail_out; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
339 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
340 /* clean up and return bytes read or error */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
341 extract_ret: |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
342 (void)inflateEnd(&strm); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
343 return ret; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
344 } |
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parents:
diff
changeset
|
345 |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
346 /* Demonstrate the use of build_index() and extract() by processing the file |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
347 provided on the command line, and the extracting 16K from about 2/3rds of |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
348 the way through the uncompressed output, and writing that to stdout. */ |
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parents:
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349 int main(int argc, char **argv) |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
350 { |
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parents:
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|
351 int len; |
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parents:
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changeset
|
352 off_t offset; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
353 FILE *in; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
354 struct access *index; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
355 unsigned char buf[CHUNK]; |
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parents:
diff
changeset
|
356 |
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parents:
diff
changeset
|
357 /* open input file */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
358 if (argc != 2) { |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
359 fprintf(stderr, "usage: zran file.gz\n"); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
360 return 1; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
361 } |
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parents:
diff
changeset
|
362 in = fopen(argv[1], "rb"); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
363 if (in == NULL) { |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
364 fprintf(stderr, "zran: could not open %s for reading\n", argv[1]); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
365 return 1; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
366 } |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
367 |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
368 /* build index */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
369 len = build_index(in, SPAN, &index); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
370 if (len < 0) { |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
371 fclose(in); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
372 switch (len) { |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
373 case Z_MEM_ERROR: |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
374 fprintf(stderr, "zran: out of memory\n"); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
375 break; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
376 case Z_DATA_ERROR: |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
377 fprintf(stderr, "zran: compressed data error in %s\n", argv[1]); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
378 break; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
379 case Z_ERRNO: |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
380 fprintf(stderr, "zran: read error on %s\n", argv[1]); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
381 break; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
382 default: |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
383 fprintf(stderr, "zran: error %d while building index\n", len); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
384 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
385 return 1; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
386 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
387 fprintf(stderr, "zran: built index with %d access points\n", len); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
388 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
389 /* use index by reading some bytes from an arbitrary offset */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
390 offset = (index->list[index->have - 1].out << 1) / 3; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
391 len = extract(in, index, offset, buf, CHUNK); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
392 if (len < 0) |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
393 fprintf(stderr, "zran: extraction failed: %s error\n", |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
394 len == Z_MEM_ERROR ? "out of memory" : "input corrupted"); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
395 else { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
396 fwrite(buf, 1, len, stdout); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
397 fprintf(stderr, "zran: extracted %d bytes at %llu\n", len, offset); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
398 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
399 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
400 /* clean up and exit */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
401 free_index(index); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
402 fclose(in); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
403 return 0; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
404 } |