Add woff2_info

Makefile

@@ -34,7 +34,7 @@ DECOBJ = $(BROTLIOBJ)/dec/*.o
 COMMONOBJ = $(BROTLIOBJ)/common/*.o
 
 OBJS = $(patsubst %, $(SRCDIR)/%, $(OUROBJ))
-EXECUTABLES=woff2_compress woff2_decompress
+EXECUTABLES=woff2_compress woff2_decompress woff2_info
 EXE_OBJS=$(patsubst %, $(SRCDIR)/%.o, $(EXECUTABLES))
 ARCHIVES=convert_woff2ttf_fuzzer convert_woff2ttf_fuzzer_new_entry
 ARCHIVE_OBJS=$(patsubst %, $(SRCDIR)/%.o, $(ARCHIVES))

src/woff2_info.cc

@@ -0,0 +1,152 @@
+// Copyright 2014 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// A commandline tool for dumping info about a woff2 file.
+
+#include <string>
+
+#include "file.h"
+#include "./woff2_common.h"
+#include "./buffer.h"
+#include "./font.h"
+#include "./table_tags.h"
+#include "./variable_length.h"
+
+std::string PrintTag(int tag) {
+  if (tag & 0x80808080) {
+    return std::string("_xfm");  // print _xfm for xform tables (else garbage)
+  }
+  char printable[] = {
+    static_cast<char>((tag >> 24) & 0xFF),
+    static_cast<char>((tag >> 16) & 0xFF),
+    static_cast<char>((tag >> 8) & 0xFF),
+    static_cast<char>(tag & 0xFF)
+  };
+  return std::string(printable, 4);
+}
+
+int main(int argc, char **argv) {
+  using std::string;
+
+  if (argc != 2) {
+    fprintf(stderr, "One argument, the input filename, must be provided.\n");
+    return 1;
+  }
+
+  string filename(argv[1]);
+  string outfilename = filename.substr(0, filename.find_last_of(".")) + ".woff2";
+  fprintf(stdout, "Processing %s => %s\n",
+    filename.c_str(), outfilename.c_str());
+  string input = woff2::GetFileContent(filename);
+
+  woff2::Buffer file(reinterpret_cast<const uint8_t*>(input.data()),
+    input.size());
+
+  printf("WOFF2Header\n");
+  uint32_t signature, flavor, length, totalSfntSize, totalCompressedSize;
+  uint32_t metaOffset, metaLength, metaOrigLength, privOffset, privLength;
+  uint16_t num_tables, reserved, major, minor;
+  if (!file.ReadU32(&signature)) return 1;
+  if (!file.ReadU32(&flavor)) return 1;
+  if (!file.ReadU32(&length)) return 1;
+  if (!file.ReadU16(&num_tables)) return 1;
+  if (!file.ReadU16(&reserved)) return 1;
+  if (!file.ReadU32(&totalSfntSize)) return 1;
+  if (!file.ReadU32(&totalCompressedSize)) return 1;
+  if (!file.ReadU16(&major)) return 1;
+  if (!file.ReadU16(&minor)) return 1;
+  if (!file.ReadU32(&metaOffset)) return 1;
+  if (!file.ReadU32(&metaLength)) return 1;
+  if (!file.ReadU32(&metaOrigLength)) return 1;
+  if (!file.ReadU32(&privOffset)) return 1;
+  if (!file.ReadU32(&privLength)) return 1;
+
+  if (signature != 0x774F4632) {
+    printf("Invalid signature: %08x\n", signature);
+    return 1;
+  }
+  printf("signature           0x%08x\n", signature);
+  printf("flavor              0x%08x\n", flavor);
+  printf("length              %d\n", length);
+  printf("numTables           %d\n", num_tables);
+  printf("reserved            %d\n", reserved);
+  printf("totalSfntSize       %d\n", totalSfntSize);
+  printf("totalCompressedSize %d\n", totalCompressedSize);
+  printf("majorVersion        %d\n", major);
+  printf("minorVersion        %d\n", minor);
+  printf("metaOffset          %d\n", metaOffset);
+  printf("metaLength          %d\n", metaLength);
+  printf("metaOrigLength      %d\n", metaOrigLength);
+  printf("privOffset          %d\n", privOffset);
+  printf("privLength          %d\n", privLength);
+
+  std::vector<uint32_t> table_tags;
+  printf("TableDirectory starts at +%zu\n", file.offset());
+  printf("Entry offset flags tag  origLength txLength\n");
+  for (auto i = 0; i < num_tables; i++) {
+    size_t offset = file.offset();
+    uint8_t flags;
+    uint32_t tag, origLength, transformLength;
+    if (!file.ReadU8(&flags)) return 1;
+    if ((flags & 0x3f) == 0x3f) {
+      if (!file.ReadU32(&tag)) return 1;
+    } else {
+      tag = woff2::kKnownTags[flags & 0x3f];
+    }
+    table_tags.push_back(tag);
+    if (!ReadBase128(&file, &origLength)) return 1;
+
+    printf("%5d %6zu  0x%02x %s %10d", i, offset, flags,
+        PrintTag(tag).c_str(), origLength);
+
+    uint8_t xform_version = (flags >> 6) & 0x3;
+    if (tag == woff2::kGlyfTableTag || tag == woff2::kLocaTableTag) {
+      if (xform_version == 0) {
+        if (!ReadBase128(&file, &transformLength)) return 1;
+        printf(" %8d", transformLength);
+      }
+    } else if (xform_version > 0) {
+      if (!ReadBase128(&file, &transformLength)) return 1;
+      printf(" %8d", transformLength);
+    }
+    printf("\n");
+  }
+
+  // Collection header
+  if (flavor == woff2::kTtcFontFlavor) {
+    uint32_t version, numFonts;
+    if (!file.ReadU32(&version)) return 1;
+    if (!woff2::Read255UShort(&file, &numFonts)) return 1;
+    printf("CollectionHeader 0x%08x %d fonts\n", version, numFonts);
+
+    for (auto i = 0; i < numFonts; i++) {
+      uint32_t numTables, flavor;
+      if (!woff2::Read255UShort(&file, &numTables)) return 1;
+      if (!file.ReadU32(&flavor)) return 1;
+      printf("CollectionFontEntry %d flavor 0x%08x %d tables\n", i, flavor,
+          numTables);
+      for (auto j = 0; j < numTables; j++) {
+        uint32_t table_idx;
+        if (!woff2::Read255UShort(&file, &table_idx)) return 1;
+        if (table_idx >= table_tags.size()) return 1;
+        printf("  %d %s (idx %d)\n", j,
+            PrintTag(table_tags[table_idx]).c_str(), table_idx);
+      }
+    }
+  }
+
+  printf("TableDirectory ends at +%zu\n", file.offset());
+
+  return 0;
+}