1 /* Copyright 2014 Google Inc. All Rights Reserved.
2
3 Distributed under MIT license.
4 See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
5 */
6
7 /* A commandline tool for dumping info about a woff2 file. */
8
9 #include <string>
10
11 #include "file.h"
12 #include "./woff2_common.h"
13 #include "./buffer.h"
14 #include "./font.h"
15 #include "./table_tags.h"
16 #include "./variable_length.h"
17
PrintTag(int tag)18 std::string PrintTag(int tag) {
19 if (tag & 0x80808080) {
20 return std::string("_xfm"); // print _xfm for xform tables (else garbage)
21 }
22 char printable[] = {
23 static_cast<char>((tag >> 24) & 0xFF),
24 static_cast<char>((tag >> 16) & 0xFF),
25 static_cast<char>((tag >> 8) & 0xFF),
26 static_cast<char>(tag & 0xFF)
27 };
28 return std::string(printable, 4);
29 }
30
main(int argc,char ** argv)31 int main(int argc, char **argv) {
32 using std::string;
33
34 if (argc != 2) {
35 fprintf(stderr, "One argument, the input filename, must be provided.\n");
36 return 1;
37 }
38
39 string filename(argv[1]);
40 string outfilename = filename.substr(0, filename.find_last_of(".")) + ".woff2";
41 fprintf(stdout, "Processing %s => %s\n",
42 filename.c_str(), outfilename.c_str());
43 string input = woff2::GetFileContent(filename);
44
45 woff2::Buffer file(reinterpret_cast<const uint8_t*>(input.data()),
46 input.size());
47
48 printf("WOFF2Header\n");
49 uint32_t signature, flavor, length, totalSfntSize, totalCompressedSize;
50 uint32_t metaOffset, metaLength, metaOrigLength, privOffset, privLength;
51 uint16_t num_tables, reserved, major, minor;
52 if (!file.ReadU32(&signature)) return 1;
53 if (!file.ReadU32(&flavor)) return 1;
54 if (!file.ReadU32(&length)) return 1;
55 if (!file.ReadU16(&num_tables)) return 1;
56 if (!file.ReadU16(&reserved)) return 1;
57 if (!file.ReadU32(&totalSfntSize)) return 1;
58 if (!file.ReadU32(&totalCompressedSize)) return 1;
59 if (!file.ReadU16(&major)) return 1;
60 if (!file.ReadU16(&minor)) return 1;
61 if (!file.ReadU32(&metaOffset)) return 1;
62 if (!file.ReadU32(&metaLength)) return 1;
63 if (!file.ReadU32(&metaOrigLength)) return 1;
64 if (!file.ReadU32(&privOffset)) return 1;
65 if (!file.ReadU32(&privLength)) return 1;
66
67 if (signature != 0x774F4632) {
68 printf("Invalid signature: %08x\n", signature);
69 return 1;
70 }
71 printf("signature 0x%08x\n", signature);
72 printf("flavor 0x%08x\n", flavor);
73 printf("length %d\n", length);
74 printf("numTables %d\n", num_tables);
75 printf("reserved %d\n", reserved);
76 printf("totalSfntSize %d\n", totalSfntSize);
77 printf("totalCompressedSize %d\n", totalCompressedSize);
78 printf("majorVersion %d\n", major);
79 printf("minorVersion %d\n", minor);
80 printf("metaOffset %d\n", metaOffset);
81 printf("metaLength %d\n", metaLength);
82 printf("metaOrigLength %d\n", metaOrigLength);
83 printf("privOffset %d\n", privOffset);
84 printf("privLength %d\n", privLength);
85
86 std::vector<uint32_t> table_tags;
87 printf("TableDirectory starts at +%zu\n", file.offset());
88 printf("Entry offset flags tag origLength txLength\n");
89 for (auto i = 0; i < num_tables; i++) {
90 size_t offset = file.offset();
91 uint8_t flags;
92 uint32_t tag, origLength, transformLength;
93 if (!file.ReadU8(&flags)) return 1;
94 if ((flags & 0x3f) == 0x3f) {
95 if (!file.ReadU32(&tag)) return 1;
96 } else {
97 tag = woff2::kKnownTags[flags & 0x3f];
98 }
99 table_tags.push_back(tag);
100 if (!ReadBase128(&file, &origLength)) return 1;
101
102 printf("%5d %6zu 0x%02x %s %10d", i, offset, flags,
103 PrintTag(tag).c_str(), origLength);
104
105 uint8_t xform_version = (flags >> 6) & 0x3;
106 if (tag == woff2::kGlyfTableTag || tag == woff2::kLocaTableTag) {
107 if (xform_version == 0) {
108 if (!ReadBase128(&file, &transformLength)) return 1;
109 printf(" %8d", transformLength);
110 }
111 } else if (xform_version > 0) {
112 if (!ReadBase128(&file, &transformLength)) return 1;
113 printf(" %8d", transformLength);
114 }
115 printf("\n");
116 }
117
118 // Collection header
119 if (flavor == woff2::kTtcFontFlavor) {
120 uint32_t version, numFonts;
121 if (!file.ReadU32(&version)) return 1;
122 if (!woff2::Read255UShort(&file, &numFonts)) return 1;
123 printf("CollectionHeader 0x%08x %d fonts\n", version, numFonts);
124
125 for (auto i = 0; i < numFonts; i++) {
126 uint32_t numTables, flavor;
127 if (!woff2::Read255UShort(&file, &numTables)) return 1;
128 if (!file.ReadU32(&flavor)) return 1;
129 printf("CollectionFontEntry %d flavor 0x%08x %d tables\n", i, flavor,
130 numTables);
131 for (auto j = 0; j < numTables; j++) {
132 uint32_t table_idx;
133 if (!woff2::Read255UShort(&file, &table_idx)) return 1;
134 if (table_idx >= table_tags.size()) return 1;
135 printf(" %d %s (idx %d)\n", j,
136 PrintTag(table_tags[table_idx]).c_str(), table_idx);
137 }
138 }
139 }
140
141 printf("TableDirectory ends at +%zu\n", file.offset());
142
143 return 0;
144 }
145