btparser/cparser/tests/exp_lex/GZipTemplate.bt

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29: LittleEndian ( ) ; 
30: 
31: 
32: typedef ubyte MAGIC [ 2 ] < read = MAGICRead , format = hex > ; 
33: 
34: string MAGICRead ( MAGIC magic ) { 
35: string ret ; 
36: string tmp ; 
37: int i ; 
38: 
39: for ( i = 0 ; i < 2 ; i ++ ) { 
40: SPrintf ( tmp , "%.2X" , magic [ i ] ) ; 
41: ret += tmp ; 
42: } 
43: 
44: return ret ; 
45: } 
46: 
47: typedef enum < ubyte > { 
48: 
49: STORED = 0 , 
50: COMPRESSED = 1 , 
51: PACKED = 2 , 
52: LZHED = 3 , 
53: RESERVED_4 = 4 , 
54: RESERVED_5 = 5 , 
55: RESERVED_6 = 6 , 
56: RESERVED_7 = 7 , 
57: 
58: DEFLATE = 8 
59: } COMPRESSION ; 
60: 
61: 
62: 
63: typedef struct { 
64: 
65: byte FLAG_ASCII_TEXT : 1 ; 
66: 
67: 
68: byte FLAG_CONTINUATION : 1 ; 
69: 
70: 
71: byte FLAG_EXTRA : 1 ; 
72: 
73: 
74: byte FLAG_NAME : 1 ; 
75: 
76: 
77: byte FLAG_COMMENT : 1 ; 
78: 
79: 
80: byte FLAG_ENCRYPTED : 1 ; 
81: 
82: 
83: byte FLAG_RESERVED : 1 ; 
84: byte FLAG_RESERVED : 1 ; 
85: } FLAGS ; 
86: 
87: typedef enum < byte > { 
88: FAT_FILESYSTEM = 0 , 
89: AMIGA = 1 , 
90: VMS = 2 , 
91: UNIX = 3 , 
92: VM_CMS = 4 , 
93: ATARI_TOS = 5 , 
94: HPFS_FILESYSTEM = 6 , 
95: MACINTOSH = 7 , 
96: Z_SYSTEM = 8 , 
97: CPM = 9 , 
98: TOPS_20 = 10 , 
99: NTFS_FILESYSTEM = 11 , 
100: QDOS = 12 , 
101: ACORN_RISCOS = 13 , 
102: UNKNOWN = 255 
103: } OS ; 
104: 
105: typedef struct { 
106: MAGIC magic_bytes < format = hex , comment = "Magic bytes for the file" > ; 
107: 
108: 
109: if ( magic_bytes [ 0 ] == 0x1F ) { 
110: if ( magic_bytes [ 1 ] == 0x8B ) { 
111: 
112: Printf ( "Appears to be a valid GZIP compressed file, attempting to parse.\n" ) ; 
113: } else if ( magic_bytes [ 1 ] == 0x1E ) { 
114: 
115: Printf ( "Appears to be a generic compressed file, attempting to parse - don't expect much though.\n" ) ; 
116: } else if ( magic_bytes [ 1 ] == 0x9E ) { 
117: 
118: Printf ( "Appears to be an old GZip compressed file, attempting to parse - don't expect much though.\n" ) ; 
119: } else if ( magic_bytes [ 1 ] == 0xA0 ) { 
120: 
121: Printf ( "Appears to be a LZH compressed file, attempting to parse - don't expect much though.\n" ) ; 
122: } 
123: } else if ( magic_bytes [ 0 ] == 0x50 && magic_bytes [ 1 ] == 0x4B ) { 
124: Warning ( "Appears to be a possible ZIP file - unable to parse with this template!" ) ; 
125: Exit ( - 1 ) ; 
126: } else { 
127: Warning ( "Does not appear to be a GZip file!" ) ; 
128: Exit ( - 1 ) ; 
129: } 
130: 
131: COMPRESSION compression_method < comment = "Compression method used by engine" > ; 
132: FLAGS flags < comment = "Optional flags for compressed section" > ; 
133: 
134: 
135: uint modification_time < comment = "Unix timestamp of the file modification time" > ; 
136: 
137: 
138: ubyte extra_flags < comment = "Extra flags, dependant on compression method" > ; 
139: 
140: 
141: OS operating_system < comment = "Operating system compression took place on" > ; 
142: 
143: 
144: if ( flags . FLAG_CONTINUATION == 1 ) { 
145: ushort part < comment = "Part number of the continuation" > ; 
146: } 
147: 
148: 
149: if ( flags . FLAG_EXTRA == 1 ) { 
150: ushort extra_length < comment = "Length of extra field" > ; 
151: byte extra_bytes [ extra_length ] < comment = "Data for extra field" > ; 
152: } 
153: 
154: if ( flags . FLAG_NAME == 1 ) { 
155: string original_file_name < comment = "Original file name" > ; 
156: } 
157: 
158: if ( flags . FLAG_COMMENT == 1 ) { 
159: string file_comment < comment = "File comment" > ; 
160: } 
161: 
162: 
163: 
164: 
165: 
166: 
167: if ( flags . FLAG_ENCRYPTED == 1 ) { 
168: 
169: } 
170: } gzip_header ; 
171: 
172: 
173: struct { 
174: 
175: gzip_header header < comment = "GZip header information" > ; 
176: 
177: 
178: 
179: byte compressed [ FileSize ( ) - FTell ( ) - 8 ] < comment = "compressed data section" > ; 
180: 
181: uint CRC32 < format = hex , comment = "CRC of the data section" > ; 
182: 
183: 
184: uint uncompressed_sized < comment = "Size of the uncompressed input" > ; 
185: } gzip_file ; tok_eof