projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| b60e6348 CMM |
1 | /* |
| 2 | * Uncompact adaptive Huffman code input to output | |
| 3 | * | |
| 4 | * On - line algorithm | |
| 5 | * | |
| 6 | * Input file does not contain decoding tree | |
| 7 | * | |
| 8 | * Written by Colin L. Mc Master (UCB) February 14, 1979 | |
| 9 | */ | |
| 10 | ||
| 11 | #include "compact.h" | |
| 12 | ||
| 13 | ||
| 14 | main (argc, argv) | |
| 15 | short argc; | |
| 16 | char *argv [ ]; | |
| 17 | { | |
| 18 | register short i; | |
| 19 | register struct node *p; | |
| 20 | register short j; | |
| 21 | register int m; | |
| 22 | union cio c, d; | |
| 23 | char b; | |
| 24 | longint ic, n; | |
| 25 | char fname [LNAME], *cp; | |
| 26 | ||
| 27 | dir [513] . next = NULL; | |
| 28 | for (head = dir + (j = 513); j--; ) { | |
| 29 | dirp = head--; | |
| 30 | head -> next = dirp; | |
| 31 | } | |
| 32 | bottom = dirp -> pt = dict; | |
| 33 | dict [0] . top [0] = dict [0] . top [1] = dirp; | |
| 34 | dirq = dirp -> next; | |
| 35 | in [EF] . flags = FBIT | SEEN; | |
| 36 | ||
| 37 | for (i = 1; ; i++) { | |
| 38 | ic = oc = 0; | |
| 39 | (bottom -> top [1]) -> next = flist; | |
| 40 | bottom -> top [1] = dirp; | |
| 41 | flist = dirq; | |
| 42 | if (i >= argc) { | |
| 43 | uncfp = stdout; | |
| 44 | cfp = stdin; | |
| 45 | } | |
| 46 | else { | |
| 47 | m = -1; | |
| 48 | cp = fname; | |
| 49 | for (j = 0; j < (LNAME - 3) && (*cp = argv [i][j]); j++) | |
| 50 | if (*cp++ == '/') m = j; | |
| 51 | if (cp [-1] == 'C' && cp [-2] == '.') cp [-2] = 0; | |
| 52 | else { | |
| 53 | fprintf (stderr, "%s: File name must end with \".C\"\n", argv [i]); | |
| 54 | if (i == argc - 1) break; | |
| 55 | continue; | |
| 56 | } | |
| 57 | if (j >= (LNAME - 3) || (j - m) > 15) { | |
| 58 | fprintf (stderr, "File name too long -- %s\n", argv [i]); | |
| 59 | if (i == argc - 1) break; | |
| 60 | continue; | |
| 61 | } | |
| 62 | if ((cfp = fopen (argv [i], "r")) == NULL) { | |
| 63 | perror (argv [i]); | |
| 64 | if (i == argc - 1) break; | |
| 65 | continue; | |
| 66 | } | |
| 67 | if ((uncfp = fopen (fname, "w")) == NULL) { | |
| 68 | perror (fname); | |
| 69 | fclose (cfp); | |
| 70 | if (i == argc - 1) break; | |
| 71 | continue; | |
| 72 | } | |
| 73 | fstat (fileno (cfp), &status); | |
| 74 | chmod (fname, status.st_mode & 07777); | |
| 75 | } | |
| 76 | ||
| 77 | if ((c . integ = getc (cfp)) != EOF) { | |
| 78 | if ((d . integ = getc (cfp)) != EOF) { | |
| 79 | c . chars . hib = d . integ & 0377; | |
| 80 | c . integ &= 0177777; | |
| 81 | if (c . integ != COMPACTED) goto notcompact; | |
| 82 | if ((c . integ = getc (cfp)) != EOF) { | |
| 83 | putc (c . chars . lob, uncfp); | |
| 84 | ic = 3; | |
| 85 | ||
| 86 | in [NC] . fp = in [EF] . fp = dict [0] . sp [0] . p = bottom = dict + 1; | |
| 87 | bottom -> count [0] = bottom -> count [1] = dict [0] . count [1] = 1; | |
| 88 | dirp -> next = dict [0] . top [1] = bottom -> top [0] = bottom -> top [1] = dirq = NEW; | |
| 89 | dirq -> next = NULL; | |
| 90 | dict [0] . fath . fp = NULL; | |
| 91 | dirq -> pt = bottom -> fath . fp = in [c . integ] . fp = dict; | |
| 92 | in [c . integ] . flags = (FBIT | SEEN); | |
| 93 | in [NC] . flags = SEEN; | |
| 94 | dict [0] . fath . flags = RLEAF; | |
| 95 | bottom -> fath . flags = (LLEAF | RLEAF); | |
| 96 | dict [0] . count [0] = 2; | |
| 97 | ||
| 98 | dict [0] . sp [1] . ch = c . integ; | |
| 99 | bottom -> sp [0] . ch = NC; | |
| 100 | bottom -> sp [1] . ch = EF; | |
| 101 | ||
| 102 | p = dict; | |
| 103 | while ((c . integ = getc (cfp)) != EOF) { | |
| 104 | ic++; | |
| 105 | for (m = 0200; m; ) { | |
| 106 | b = (m & c . integ ? 1 : 0); | |
| 107 | m >>= 1; | |
| 108 | if (p -> fath . flags & (b ? RLEAF : LLEAF)) { | |
| 109 | d . integ = p -> sp [b] . ch; | |
| 110 | if (d . integ == EF) break; | |
| 111 | if (d . integ == NC) { | |
| 112 | uptree (NC); | |
| 113 | d . integ = 0; | |
| 114 | for (j = 8; j--; m >>= 1) { | |
| 115 | if (m == 0) { | |
| 116 | c . integ = getc (cfp); | |
| 117 | ic++; | |
| 118 | m = 0200; | |
| 119 | } | |
| 120 | d . integ <<= 1; | |
| 121 | if (m & c . integ) d . integ++; | |
| 122 | } | |
| 123 | insert (d . integ); | |
| 124 | } | |
| 125 | uptree (d . integ); | |
| 126 | putc (d . chars . lob, uncfp); | |
| 127 | oc++; | |
| 128 | p = dict; | |
| 129 | } | |
| 130 | else p = p -> sp [b] . p; | |
| 131 | } | |
| 132 | } | |
| 133 | } | |
| 134 | } | |
| 135 | else goto notcompact; | |
| 136 | } | |
| 137 | else { | |
| 138 | notcompact : if (i < argc) { | |
| 139 | fprintf (stderr, "%s: ", argv [i]); | |
| 140 | unlink (fname); | |
| 141 | } | |
| 142 | if (c . integ == PACKED) fprintf (stderr, "File is packed. Use unpack.\n"); | |
| 143 | else fprintf (stderr, "Not a compacted file.\n"); | |
| 144 | if (i >= argc) break; | |
| 145 | goto closeboth; | |
| 146 | } | |
| 147 | ||
| 148 | if (ferror (uncfp) || ferror (cfp)) | |
| 149 | if (i < argc) { | |
| 150 | if (ferror (uncfp)) | |
| 151 | perror (fname); | |
| 152 | else | |
| 153 | perror (argv [i]); | |
| 154 | fprintf (stderr, "Unable to uncompact %s\n", argv [i]); | |
| 155 | unlink (fname); | |
| 156 | goto closeboth; | |
| 157 | } | |
| 158 | if (i >= argc) break; | |
| 159 | fprintf (stderr, "%s uncompacted to %s\n", argv [i], fname); | |
| 160 | unlink (argv [i]); | |
| 161 | closeboth : fclose (cfp); | |
| 162 | closein : fclose (uncfp); | |
| 163 | if (i == argc - 1) break; | |
| 164 | for (j = 256; j--; ) in [j] . flags = 0; | |
| 165 | continue; | |
| 166 | fail : fprintf (stderr, "Unsuccessful uncompact of standard input to standard output.\n"); | |
| 167 | break; | |
| 168 | } | |
| 169 | } |