ttf文件

byte

ttId                 [0X00, 0X03]

num_tables     [0X04, 0X05]

                        [0X06, 0X0B]  skip six bytes

tables tag and location 

可以查看itext\com\itextpdf\text\pdf\TrueTypeFont.java

StandardString (编码：WINANSI)

UnicodeString (编码：UNICODE)

typedef struct ｛

    table_tag : 4byte (转成String 时的编码为 WINANSI="Cp1252"或Unicode)

    checkSum： 4byte

    offset      :  1byte

    length    ：1byte

｝Table

table中是否有"CFF "tag

checkCff ??

table_tag="name"  offset + 2

numRecords            ：[offset + 3, offset + 4] 2 byte

startOfStorage        ：[offset + 5, offset + 6] 2 byte

16records

records struct {

    platformID                    : 2 byte (SampleValue=3,,,)

    platformEncodingID      : 2 byte (SampleValue=1)

    languageID                  ：2 byte (SampleValue=1033)

    nameID                       ：2 byte (SampleValue=0,1,2,3)

    length                          : 2 byte (SampleValue=100,,,60)

    offset                           : 2 byte (SampleValue=0,,,152)

}

No.

platformID

platformEncodingID

languageID

nameID

length

offset

1	3	1	1033	0	100	0
2	3	1	1033	1	38	100
3	3	1	1033	2	14	138
4	3	1	1033	3	60	152
5	3	1	1033	4	38	100
6	3	1	1033	5	24	212
7				6	34	236
8				7	156	270
9	3	1	1033	8	40	426
10	3	1	1033	9	28	466

11	3	1	1033	10	208	494
12	3	1	1033	11	56	702
13	3	1	1033	12	92	758
14	3	1	1033	13	92	850
15	3	1	1033	14	84	942

fontName :DroidSansFallback

fullName :Droid Sans Fallback

familyName :Droid Sans Fallback

allNameEntries

0	"Digitized data copyright Google Corporation © 2006"
1	"Droid Sans Fallback"
2	"Regular"
3	"Ascender - Droid Sans Fallback"
4	"Droid Sans Fallback"
5	"Version 2.56"
6	"DroidSansFallback"
7	"Droid is a trademark of Google and may be registered in certain jurisdictions."
8	"Ascender Corporation"

9	"Steve Matteson"
10	"Droid Sans is a humanist sans serif typeface designed for user interfaces and electronic communications."
11	"http://www.ascendercorp.com/"
12	"http://www.ascendercorp.com/typedesigners.html"
13	"Licensed under the Apache License, Version 2.0"
14	"http://www.apache.org/licenses/LICENSE-2.0"

相关资料

ttf

baseline is the horizontal axis:

the baseline is vertical, identical to the vertical axis:

table head struct {

    flags                    : 2 byte

    unitsPerEm          : 2 byte

    createTime           : 8 byte

    modifyTime          : 8 byte

    xMin                    : 2 byte (sign)

    yMin                    : 2 byte (sign)

    xMax                   : 2 byte (sign)

    yMax                   : 2 byte (sign)

    macStyle              : 2 byte (unsigned short)

}

table hhea struct {

}

可参考文档1 可参考文档2