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annotate zlib/inflate.h @ 2005:3ce38692a3f2

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Set initial pan bits in YM2612 register array and not just the separate lr field of the channel. This fixes an issue in which some channels would be silent in VGM log output
author Michael Pavone <pavone@retrodev.com>
date Sun, 11 Oct 2020 22:42:10 -0700
parents 00d788dac91a
children
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1 /* inflate.h -- internal inflate state definition
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2 * Copyright (C) 1995-2016 Mark Adler
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3 * For conditions of distribution and use, see copyright notice in zlib.h
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4 */
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5
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6 /* WARNING: this file should *not* be used by applications. It is
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7 part of the implementation of the compression library and is
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8 subject to change. Applications should only use zlib.h.
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9 */
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10
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11 /* define NO_GZIP when compiling if you want to disable gzip header and
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12 trailer decoding by inflate(). NO_GZIP would be used to avoid linking in
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13 the crc code when it is not needed. For shared libraries, gzip decoding
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14 should be left enabled. */
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15 #ifndef NO_GZIP
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16 # define GUNZIP
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17 #endif
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18
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19 /* Possible inflate modes between inflate() calls */
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20 typedef enum {
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21 HEAD = 16180, /* i: waiting for magic header */
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22 FLAGS, /* i: waiting for method and flags (gzip) */
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23 TIME, /* i: waiting for modification time (gzip) */
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24 OS, /* i: waiting for extra flags and operating system (gzip) */
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25 EXLEN, /* i: waiting for extra length (gzip) */
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26 EXTRA, /* i: waiting for extra bytes (gzip) */
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27 NAME, /* i: waiting for end of file name (gzip) */
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28 COMMENT, /* i: waiting for end of comment (gzip) */
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29 HCRC, /* i: waiting for header crc (gzip) */
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30 DICTID, /* i: waiting for dictionary check value */
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31 DICT, /* waiting for inflateSetDictionary() call */
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32 TYPE, /* i: waiting for type bits, including last-flag bit */
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33 TYPEDO, /* i: same, but skip check to exit inflate on new block */
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34 STORED, /* i: waiting for stored size (length and complement) */
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35 COPY_, /* i/o: same as COPY below, but only first time in */
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36 COPY, /* i/o: waiting for input or output to copy stored block */
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37 TABLE, /* i: waiting for dynamic block table lengths */
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38 LENLENS, /* i: waiting for code length code lengths */
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39 CODELENS, /* i: waiting for length/lit and distance code lengths */
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40 LEN_, /* i: same as LEN below, but only first time in */
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41 LEN, /* i: waiting for length/lit/eob code */
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42 LENEXT, /* i: waiting for length extra bits */
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43 DIST, /* i: waiting for distance code */
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44 DISTEXT, /* i: waiting for distance extra bits */
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45 MATCH, /* o: waiting for output space to copy string */
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46 LIT, /* o: waiting for output space to write literal */
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47 CHECK, /* i: waiting for 32-bit check value */
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48 LENGTH, /* i: waiting for 32-bit length (gzip) */
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49 DONE, /* finished check, done -- remain here until reset */
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50 BAD, /* got a data error -- remain here until reset */
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51 MEM, /* got an inflate() memory error -- remain here until reset */
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52 SYNC /* looking for synchronization bytes to restart inflate() */
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53 } inflate_mode;
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54
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55 /*
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56 State transitions between above modes -
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57
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58 (most modes can go to BAD or MEM on error -- not shown for clarity)
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59
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60 Process header:
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61 HEAD -> (gzip) or (zlib) or (raw)
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62 (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME -> COMMENT ->
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63 HCRC -> TYPE
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64 (zlib) -> DICTID or TYPE
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65 DICTID -> DICT -> TYPE
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66 (raw) -> TYPEDO
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67 Read deflate blocks:
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68 TYPE -> TYPEDO -> STORED or TABLE or LEN_ or CHECK
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69 STORED -> COPY_ -> COPY -> TYPE
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70 TABLE -> LENLENS -> CODELENS -> LEN_
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71 LEN_ -> LEN
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72 Read deflate codes in fixed or dynamic block:
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73 LEN -> LENEXT or LIT or TYPE
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74 LENEXT -> DIST -> DISTEXT -> MATCH -> LEN
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75 LIT -> LEN
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76 Process trailer:
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77 CHECK -> LENGTH -> DONE
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78 */
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79
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80 /* State maintained between inflate() calls -- approximately 7K bytes, not
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81 including the allocated sliding window, which is up to 32K bytes. */
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82 struct inflate_state {
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83 z_streamp strm; /* pointer back to this zlib stream */
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84 inflate_mode mode; /* current inflate mode */
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85 int last; /* true if processing last block */
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86 int wrap; /* bit 0 true for zlib, bit 1 true for gzip,
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87 bit 2 true to validate check value */
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88 int havedict; /* true if dictionary provided */
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89 int flags; /* gzip header method and flags (0 if zlib) */
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90 unsigned dmax; /* zlib header max distance (INFLATE_STRICT) */
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91 unsigned long check; /* protected copy of check value */
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92 unsigned long total; /* protected copy of output count */
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93 gz_headerp head; /* where to save gzip header information */
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94 /* sliding window */
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95 unsigned wbits; /* log base 2 of requested window size */
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96 unsigned wsize; /* window size or zero if not using window */
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97 unsigned whave; /* valid bytes in the window */
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98 unsigned wnext; /* window write index */
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99 unsigned char FAR *window; /* allocated sliding window, if needed */
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100 /* bit accumulator */
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101 unsigned long hold; /* input bit accumulator */
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102 unsigned bits; /* number of bits in "in" */
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103 /* for string and stored block copying */
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104 unsigned length; /* literal or length of data to copy */
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105 unsigned offset; /* distance back to copy string from */
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106 /* for table and code decoding */
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107 unsigned extra; /* extra bits needed */
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108 /* fixed and dynamic code tables */
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109 code const FAR *lencode; /* starting table for length/literal codes */
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110 code const FAR *distcode; /* starting table for distance codes */
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111 unsigned lenbits; /* index bits for lencode */
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112 unsigned distbits; /* index bits for distcode */
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113 /* dynamic table building */
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114 unsigned ncode; /* number of code length code lengths */
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115 unsigned nlen; /* number of length code lengths */
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116 unsigned ndist; /* number of distance code lengths */
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117 unsigned have; /* number of code lengths in lens[] */
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118 code FAR *next; /* next available space in codes[] */
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119 unsigned short lens[320]; /* temporary storage for code lengths */
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120 unsigned short work[288]; /* work area for code table building */
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121 code codes[ENOUGH]; /* space for code tables */
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122 int sane; /* if false, allow invalid distance too far */
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123 int back; /* bits back of last unprocessed length/lit */
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124 unsigned was; /* initial length of match */
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125 };