Debugging OpenType字体的表格未对齐错误_Debugging_Fonts_Binary_Byte_Opentype

Debugging OpenType字体的表格未对齐错误

debugging fonts binary

Debugging OpenType字体的表格未对齐错误,debugging,fonts,binary,byte,opentype,Debugging,Fonts,Binary,Byte,Opentype,我有一个错误，它与构建OpenType字体的以下3个规范属性有关：搜索范围 rangeShift 入口选择器在第页，它提到了它的工作原理： searchRange是小于或等于表中项目数的两个值的最大幂，即可以轻松搜索的最大项目数 rangeShift是项目数减去搜索范围；i、 e.如果只查看searchRange项目，则无法查看的项目数入口选择器是log2（搜索范围）鉴于这些信息，我们： searchRange=maxPowerOf2调试输出时，您可能会发现使用十六进制转储格式

我有一个错误，它与构建OpenType字体的以下3个规范属性有关：

搜索范围
rangeShift
入口选择器

在第页，它提到了它的工作原理：

searchRange是小于或等于表中项目数的两个值的最大幂，即可以轻松搜索的最大项目数
rangeShift是项目数减去搜索范围；i、 e.如果只查看searchRange项目，则无法查看的项目数
入口选择器是log2（搜索范围）

鉴于这些信息，我们：

searchRange=maxPowerOf2调试输出时，您可能会发现使用十六进制转储格式（在右列中显示字节的ASCII表示形式）很有帮助。我使用xxd 进行此操作，并建议您也这样做。特别是对于OpenType字体，这种转储格式对于发现对齐问题非常方便，尤其是在字体标题中看看我的意思：这里是你的一个垃圾堆的第一部分： 00000000: 4f54 544f 0009 0008 0003 0001 4346 4620 OTTO........CFF 00000010: 0000 0000 0000 00c2 9c00 0000 0563 6d61 .............cma 00000020: 7000 0000 0000 0000 c2a4 0000 0024 6865 p............$he 00000030: 6164 0000 0000 0000 00c3 8800 0000 3668 ad............6h 00000040: 6865 6100 0000 0000 0001 0000 0000 2468 hea...........$h 00000050: 6d74 7800 0000 0000 0001 2400 0000 006d mtx.......$....m 00000060: 6178 7000 0000 0000 0001 2400 0000 066e axp.......$....n 00000070: 616d 6500 0000 0000 0001 2c00 0000 064f ame.......,....O 00000080: 532f 3200 0000 0000 0001 3400 0000 6470 S/2.......4...dp 00000090: 6f73 7400 0000 0000 0001 c298 0000 0020 ost............ 您可以看到第一个tableDirectory条目，对于CFF 表，标记（'CFF'）从第一行的最后4个字节开始（4346 4620 ，在ASCII中是'CFF'），这是正确的对齐方式。因为hextump行长度正好是16个字节，而且每个tableDirectory条目都是16个字节，所以正确对齐的tableDirectory会将每个表的标记作为行的最后4个字节。但正如您所看到的，您有一些未对齐的情况，'cmap'的'c'（0x63）向右偏了一个字节，随后的tableDirectory条目也发生了移位。它应该更像这样： 00000000: 4f54 544f 0009 0008 0003 0001 4346 4620 OTTO........CFF 00000010: ???? ???? ???? ???? ???? ???? 636d 6170 ............cmap 00000020: ???? ???? ???? ???? ???? ???? 6865 6164 ............head 00000030: ???? ???? ???? ???? ???? ???? 6868 6561 ............hhea [...] 因此，对于某些tableDirectory条目，在末尾添加了一个额外的字节。因此，您需要先备份并检查代码并使其正常工作，然后再考虑searchRange、rangeShift和entrySelector（假设您的字体包含9个公布的表格，则应为：0080 0003 0010 （十六进制）） OTS parsing error: CFF : misaligned table 4f54 544f 0009 0008 0003 0001 4346 4620 0000 0000 0000 00c2 9c00 0000 0563 6d61 7000 0000 0000 0000 c2a4 0000 0024 6865 6164 0000 0000 0000 00c3 8800 0000 3668 6865 6100 0000 0000 0001 0000 0000 2468 6d74 7800 0000 0000 0001 2400 0000 006d 6178 7000 0000 0000 0001 2400 0000 066e 616d 6500 0000 0000 0001 2c00 0000 064f 532f 3200 0000 0000 0001 3400 0000 6470 6f73 7400 0000 0000 0001 c298 0000 0020 0200 0400 0000 0000 0000 0001 0000 0006 0000 0010 0004 0010 0000 0002 0002 0000 0000 c3bf c3bf 0000 c3bf c3bf 0001 0000 0001 0000 0001 0000 0000 0000 5f0f 3cc3 b500 0303 c3a8 0000 0000 c398 6526 c388 0000 0000 c398 6526 c388 0000 0000 0000 0000 0000 0003 0002 0000 0000 0000 0001 0000 00c3 8800 6400 0000 0000 0000 0000 0000 0100 0000 0000 0000 0000 0000 0000 0000 0000 0050 0000 0000 0000 0000 0000 0600 0000 0500 0000 0000 0000 0002 c28a 02c2 bb00 0000 c28c 02c2 8a02 c2bb 0000 01c3 9f00 3101 0200 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0058 5858 5800 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0300 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 00 4f54 544f 0009 00c2 8000 0700 1043 4646 2000 0000 0000 0000 c29c 0000 0005 636d 6170 0000 0000 0000 00c2 a400 0000 2468 6561 6400 0000 0000 0000 c388 0000 0036 6868 6561 0000 0000 0000 0100 0000 0024 686d 7478 0000 0000 0000 0124 0000 0000 6d61 7870 0000 0000 0000 0124 0000 0006 6e61 6d65 0000 0000 0000 012c 0000 0006 4f53 2f32 0000 0000 0000 0134 0000 0064 706f 7374 0000 0000 0000 01c2 9800 0000 2002 0004 0000 0000 0000 0000 0100 0000 0600 0000 1000 0400 1000 0000 0200 0200 0000 00c3 bfc3 bf00 00c3 bfc3 bf00 0100 0000 0100 0000 0100 0000 0000 005f 0f3c c3b5 0003 03c3 a800 0000 00c3 9865 271d 0000 0000 c398 6527 1d00 0000 0000 0000 0000 0000 0300 0200 0000 0000 0000 0100 0000 c388 0064 0000 0000 0000 0000 0000 0001 0000 0000 0000 0000 0000 0000 0000 0000 0000 5000 0000 0000 0000 0000 0006 0000 0005 0000 0000 0000 0000 02c2 8a02 c2bb 0000 00c2 8c02 c28a 02c2 bb00 0001 c39f 0031 0102 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 5858 5858 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0003 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 { "name": "sfnt", "fields": { "scalar": { "type": "TAG", "value": "OTTO" }, "numTables": { "type": "USHORT", "value": 9 }, "searchRange": { "type": "USHORT", "value": 128 }, "entrySelector": { "type": "USHORT", "value": 7 }, "rangeShift": { "type": "USHORT", "value": 16 }, "CFF Table Record": { "type": "RECORD", "value": { "name": "Table Record", "fields": { "tag": { "type": "TAG", "value": "CFF " }, "checkSum": { "type": "ULONG", "value": 0 }, "offset": { "type": "ULONG", "value": 156 }, "length": { "type": "ULONG", "value": 5 } } } }, "cmap Table Record": { "type": "RECORD", "value": { "name": "Table Record", "fields": { "tag": { "type": "TAG", "value": "cmap" }, "checkSum": { "type": "ULONG", "value": 0 }, "offset": { "type": "ULONG", "value": 164 }, "length": { "type": "ULONG", "value": 36 } } } }, "head Table Record": { "type": "RECORD", "value": { "name": "Table Record", "fields": { "tag": { "type": "TAG", "value": "head" }, "checkSum": { "type": "ULONG", "value": 0 }, "offset": { "type": "ULONG", "value": 200 }, "length": { "type": "ULONG", "value": 54 } } } }, "hhea Table Record": { "type": "RECORD", "value": { "name": "Table Record", "fields": { "tag": { "type": "TAG", "value": "hhea" }, "checkSum": { "type": "ULONG", "value": 0 }, "offset": { "type": "ULONG", "value": 256 }, "length": { "type": "ULONG", "value": 36 } } } }, "hmtx Table Record": { "type": "RECORD", "value": { "name": "Table Record", "fields": { "tag": { "type": "TAG", "value": "hmtx" }, "checkSum": { "type": "ULONG", "value": 0 }, "offset": { "type": "ULONG", "value": 292 }, "length": { "type": "ULONG", "value": 0 } } } }, "maxp Table Record": { "type": "RECORD", "value": { "name": "Table Record", "fields": { "tag": { "type": "TAG", "value": "maxp" }, "checkSum": { "type": "ULONG", "value": 0 }, "offset": { "type": "ULONG", "value": 292 }, "length": { "type": "ULONG", "value": 6 } } } }, "name Table Record": { "type": "RECORD", "value": { "name": "Table Record", "fields": { "tag": { "type": "TAG", "value": "name" }, "checkSum": { "type": "ULONG", "value": 0 }, "offset": { "type": "ULONG", "value": 300 }, "length": { "type": "ULONG", "value": 6 } } } }, "OS/2 Table Record": { "type": "RECORD", "value": { "name": "Table Record", "fields": { "tag": { "type": "TAG", "value": "OS/2" }, "checkSum": { "type": "ULONG", "value": 0 }, "offset": { "type": "ULONG", "value": 308 }, "length": { "type": "ULONG", "value": 100 } } } }, "post Table Record": { "type": "RECORD", "value": { "name": "Table Record", "fields": { "tag": { "type": "TAG", "value": "post" }, "checkSum": { "type": "ULONG", "value": 0 }, "offset": { "type": "ULONG", "value": 408 }, "length": { "type": "ULONG", "value": 32 } } } }, "CFF table": { "type": "RECORD", "value": { "name": "CFF ", "fields": { "header": { "type": "RECORD", "value": { "name": "Header", "fields": { "major": { "type": "BYTE", "value": 2 }, "minor": { "type": "BYTE", "value": 0 }, "hdrSize": { "type": "BYTE", "value": 4 }, "topDictLength": { "type": "USHORT", "value": 0 } } } } } } }, "padding_0": { "type": "BYTE", "value": 0 }, "padding_1": { "type": "BYTE", "value": 0 }, "padding_2": { "type": "BYTE", "value": 0 }, "cmap table": { "type": "RECORD", "value": { "name": "cmap", "fields": { "version": { "type": "USHORT", "value": 0 }, "numTables": { "type": "USHORT", "value": 1 }, "platformID": { "type": "USHORT", "value": 0 }, "encodingID": { "type": "USHORT", "value": 6 }, "offset": { "type": "ULONG", "value": 16 }, "format": { "type": "USHORT", "value": 4 }, "cmap4Length": { "type": "USHORT", "value": 16 }, "language": { "type": "USHORT", "value": 0 }, "segCountX2": { "type": "USHORT", "value": 2 }, "searchRange": { "type": "USHORT", "value": 2 }, "entrySelector": { "type": "USHORT", "value": 0 }, "rangeShift": { "type": "USHORT", "value": 0 }, "end_0": { "type": "USHORT", "value": 65535 }, "reservedPad": { "type": "USHORT", "value": 0 }, "start_0": { "type": "USHORT", "value": 65535 }, "idDelta_0": { "type": "SHORT", "value": 1 }, "idRangeOffset_0": { "type": "USHORT", "value": 0 } } } }, "head table": { "type": "RECORD", "value": { "name": "head", "fields": { "version": { "type": "FIXED", "value": 65536 }, "fontRevision": { "type": "FIXED", "value": 65536 }, "checkSumAdjustment": { "type": "ULONG", "value": 0 }, "magicNumber": { "type": "ULONG", "value": 1594834165 }, "flags": { "type": "USHORT", "value": 3 }, "unitsPerEm": { "type": "USHORT", "value": 1000 }, "created": { "type": "LONGDATETIME", "value": 3630507805 }, "modified": { "type": "LONGDATETIME", "value": 3630507805 }, "xMin": { "type": "SHORT", "value": null }, "yMin": { "type": "SHORT", "value": null }, "xMax": { "type": "SHORT", "value": null }, "yMax": { "type": "SHORT", "value": null }, "macStyle": { "type": "USHORT", "value": 0 }, "lowestRecPPEM": { "type": "USHORT", "value": 3 }, "fontDirectionHint": { "type": "SHORT", "value": 2 }, "indexToLocFormat": { "type": "SHORT", "value": 0 }, "glyphDataFormat": { "type": "SHORT", "value": 0 } } } }, "padding_3": { "type": "BYTE", "value": 0 }, "padding_4": { "type": "BYTE", "value": 0 }, "hhea table": { "type": "RECORD", "value": { "name": "hhea", "fields": { "version": { "type": "FIXED", "value": 65536 }, "ascender": { "type": "FWORD", "value": 200 }, "descender": { "type": "FWORD", "value": 100 }, "lineGap": { "type": "FWORD", "value": 0 }, "advanceWidthMax": { "type": "UFWORD", "value": null }, "minLeftSideBearing": { "type": "FWORD", "value": null }, "minRightSideBearing": { "type": "FWORD", "value": null }, "xMaxExtent": { "type": "FWORD", "value": null }, "caretSlopeRise": { "type": "SHORT", "value": 1 }, "caretSlopeRun": { "type": "SHORT", "value": 0 }, "caretOffset": { "type": "SHORT", "value": 0 }, "reserved1": { "type": "SHORT", "value": 0 }, "reserved2": { "type": "SHORT", "value": 0 }, "reserved3": { "type": "SHORT", "value": 0 }, "reserved4": { "type": "SHORT", "value": 0 }, "metricDataFormat": { "type": "SHORT", "value": 0 }, "numberOfHMetrics": { "type": "USHORT", "value": 0 } } } }, "hmtx table": { "type": "RECORD", "value": { "name": "hmtx", "fields": {} } }, "maxp table": { "type": "RECORD", "value": { "name": "maxp", "fields": { "version": { "type": "FIXED", "value": 20480 }, "numGlyphs": { "type": "USHORT", "value": 0 } } } }, "padding_5": { "type": "BYTE", "value": 0 }, "padding_6": { "type": "BYTE", "value": 0 }, "name table": { "type": "RECORD", "value": { "name": "name", "fields": { "format": { "type": "USHORT", "value": 0 }, "count": { "type": "USHORT", "value": 0 }, "stringOffset": { "type": "USHORT", "value": 6 }, "strings": { "type": "LITERAL", "value": [] } } } }, "padding_7": { "type": "BYTE", "value": 0 }, "padding_8": { "type": "BYTE", "value": 0 }, "OS/2 table": { "type": "RECORD", "value": { "name": "OS/2", "fields": { "version": { "type": "USHORT", "value": 5 }, "xAvgCharWidth": { "type": "SHORT", "value": 0 }, "usWeightClass": { "type": "USHORT", "value": 0 }, "usWidthClass": { "type": "USHORT", "value": 0 }, "fsType": { "type": "USHORT", "value": 0 }, "ySubscriptXSize": { "type": "SHORT", "value": 650 }, "ySubscriptYSize": { "type": "SHORT", "value": 699 }, "ySubscriptXOffset": { "type": "SHORT", "value": 0 }, "ySubscriptYOffset": { "type": "SHORT", "value": 140 }, "ySuperscriptXSize": { "type": "SHORT", "value": 650 }, "ySuperscriptYSize": { "type": "SHORT", "value": 699 }, "ySuperscriptXOffset": { "type": "SHORT", "value": 0 }, "ySuperscriptYOffset": { "type": "SHORT", "value": 479 }, "yStrikeoutSize": { "type": "SHORT", "value": 49 }, "yStrikeoutPosition": { "type": "SHORT", "value": 258 }, "sFamilyClass": { "type": "SHORT", "value": 0 }, "bFamilyType": { "type": "BYTE", "value": 0 }, "bSerifStyle": { "type": "BYTE", "value": 0 }, "bWeight": { "type": "BYTE", "value": 0 }, "bProportion": { "type": "BYTE", "value": 0 }, "bContrast": { "type": "BYTE", "value": 0 }, "bStrokeVariation": { "type": "BYTE", "value": 0 }, "bArmStyle": { "type": "BYTE", "value": 0 }, "bLetterform": { "type": "BYTE", "value": 0 }, "bMidline": { "type": "BYTE", "value": 0 }, "bXHeight": { "type": "BYTE", "value": 0 }, "ulUnicodeRange1": { "type": "ULONG", "value": 0 }, "ulUnicodeRange2": { "type": "ULONG", "value": 0 }, "ulUnicodeRange3": { "type": "ULONG", "value": 0 }, "ulUnicodeRange4": { "type": "ULONG", "value": 0 }, "achVendID": { "type": "CHARARRAY", "value": "XXXX" }, "fsSelection": { "type": "USHORT", "value": 0 }, "usFirstCharIndex": { "type": "USHORT", "value": 0 }, "usLastCharIndex": { "type": "USHORT", "value": 0 }, "sTypoAscender": { "type": "SHORT", "value": 0 }, "sTypoDescender": { "type": "SHORT", "value": 0 }, "sTypoLineGap": { "type": "SHORT", "value": 0 }, "usWinAscent": { "type": "USHORT", "value": 0 }, "usWinDescent": { "type": "USHORT", "value": 0 }, "ulCodePageRange1": { "type": "ULONG", "value": 0 }, "ulCodePageRange2": { "type": "ULONG", "value": 0 }, "sxHeight": { "type": "SHORT", "value": 0 }, "sCapHeight": { "type": "SHORT", "value": 0 }, "usDefaultChar": { "type": "USHORT", "value": 0 }, "usBreakChar": { "type": "USHORT", "value": 0 }, "usMaxContext": { "type": "USHORT", "value": 0 }, "usLowerOpticalPointSize": { "type": "USHORT", "value": 0 }, "usUpperOpticalPointSize": { "type": "USHORT", "value": 0 } } } }, "post table": { "type": "RECORD", "value": { "name": "post", "fields": { "version": { "type": "FIXED", "value": 196608 }, "italicAngle": { "type": "FIXED", "value": 0 }, "underlinePosition": { "type": "FWORD", "value": 0 }, "underlineThickness": { "type": "FWORD", "value": 0 }, "isFixedPitch": { "type": "ULONG", "value": 0 }, "minMemType42": { "type": "ULONG", "value": 0 }, "maxMemType42": { "type": "ULONG", "value": 0 }, "minMemType1": { "type": "ULONG", "value": 0 }, "maxMemType1": { "type": "ULONG", "value": 0 } } } } } } 79 84 84 79 0 9 0 8 0 3 0 1 67 70 70 32 (1) 0 0 0 0 0 0 0 156 0 0 0 5 99 109 97 112 (2) 0 0 0 0 0 0 0 164 0 0 0 36 104 101 97 100 (3) 0 0 0 0 0 0 0 200 0 0 0 54 104 104 101 97 (4) 0 0 0 0 0 0 1 0 0 0 0 36 104 109 116 120 (5) 0 0 0 0 0 0 1 36 0 0 0 0 109 97 120 112 (6) 0 0 0 0 0 0 1 36 0 0 0 6 110 97 109 101 (7) 0 0 0 0 0 0 1 44 0 0 0 6 79 83 47 50 (8) 0 0 0 0 0 0 1 52 0 0 0 100 112 111 115 116 (9) 0 0 0 0 0 0 1 152 0 0 0 32 2 0 4 0 (CFF start) 0 0 0 0 (4-align with three 0's) 0 0 0 1 (cmap start) 0 0 0 6 0 0 0 16 0 4 0 16 0 0 0 2 0 2 0 0 0 0 255 255 0 0 255 255 0 1 0 0 0 1 0 0 0 1 0 0 0 0 0 0 95 15 60 245 0 3 3 232 0 0 0 0 216 101 49 90 0 0 0 0 216 101 49 90 0 0 0 0 0 0 0 0 0 0 0 3 0 2 0 0 0 0 0 0 0 1 0 0 0 200 0 100 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 80 0 0 0 0 0 0 0 0 0 0 6 0 0 0 5 0 0 0 0 0 0 0 0 2 138 2 187 0 0 0 140 2 138 2 187 0 0 1 223 0 49 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 88 88 88 88 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00000000: 4f54 544f 0009 0008 0003 0001 4346 4620 OTTO........CFF 00000010: 0000 0000 0000 00c2 9c00 0000 0563 6d61 .............cma 00000020: 7000 0000 0000 0000 c2a4 0000 0024 6865 p............$he 00000030: 6164 0000 0000 0000 00c3 8800 0000 3668 ad............6h 00000040: 6865 6100 0000 0000 0001 0000 0000 2468 hea...........$h 00000050: 6d74 7800 0000 0000 0001 2400 0000 006d mtx.......$....m 00000060: 6178 7000 0000 0000 0001 2400 0000 066e axp.......$....n 00000070: 616d 6500 0000 0000 0001 2c00 0000 064f ame.......,....O 00000080: 532f 3200 0000 0000 0001 3400 0000 6470 S/2.......4...dp 00000090: 6f73 7400 0000 0000 0001 c298 0000 0020 ost............ 00000000: 4f54 544f 0009 0008 0003 0001 4346 4620 OTTO........CFF 00000010: ???? ???? ???? ???? ???? ???? 636d 6170 ............cmap 00000020: ???? ???? ???? ???? ???? ???? 6865 6164 ............head 00000030: ???? ???? ???? ???? ???? ???? 6868 6561 ............hhea [...]