本文整理匯總了Golang中github.com/raff/pdfreader/fancy.Reader.Slice方法的典型用法代碼示例。如果您正苦於以下問題:Golang Reader.Slice方法的具體用法?Golang Reader.Slice怎麽用?Golang Reader.Slice使用的例子?那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類github.com/raff/pdfreader/fancy.Reader
的用法示例。
在下文中一共展示了Reader.Slice方法的4個代碼示例,這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚,您的評價將有助於係統推薦出更棒的Golang代碼示例。
示例1: refToken
func refToken(f fancy.Reader) ([]byte, int64) {
tok, p := ps.Token(f)
if len(tok) > 0 && tok[0] >= '0' && tok[0] <= '9' {
ps.Token(f)
r, q := ps.Token(f)
if string(r) == "R" {
f.Seek(p, 0)
tok = f.Slice(int(1 + q - p))
} else {
f.Seek(p+int64(len(tok)), 0)
}
}
return tok, p
}
示例2: xrefReadTable
// xrefReadTable() reads the xref table(s) of a PDF file. This is not recursive
// in favour of not to have to keep track of already used starting points
// for xrefs.
func xrefReadTable(f fancy.Reader, p int) (map[int]int, DictionaryT) {
var trailer DictionaryT
var back [MAX_PDF_UPDATES]int
b := 0
s := _Bytes
for ok := true; ok; {
back[b] = p
b++
p = xrefSkip(f, p)
f.Seek(int64(p), 0)
s, _ = ps.Token(f)
if string(s) != "trailer" {
util.Log("no trailer / xref table")
return nil, nil
}
s, _ = ps.Token(f)
if trailer == nil {
trailer = Dictionary(s)
}
s, ok = Dictionary(s)["/Prev"]
p = num(s)
}
r := make(map[int]int)
for b != 0 {
b--
f.Seek(int64(back[b]), 0)
ps.Token(f) // skip "xref"
for {
m := tuple(f, 2)
if string(m[0]) == "trailer" {
break
}
ps.SkipLE(f)
o := num(m[0])
dat := f.Slice(num(m[1]) * 20)
for i := 0; i < len(dat); i += 20 {
if dat[i+17] != 'n' {
delete(r, o)
} else {
r[o] = num(dat[i : i+10])
}
o++
}
}
}
return r, trailer
}
示例3: Token
func Token(f fancy.Reader) ([]byte, int64) {
again:
c := skipSpaces(f)
if c == 0 {
return []byte{}, -1
}
p := fpos(f) - 1
switch c {
case '%':
skipComment(f)
goto again
case '<', '[', '{':
skipComposite(f)
case '(':
skipString(f)
default:
if skipToDelim(f) != 255 {
f.UnreadByte()
}
}
n := int(fpos(f) - p)
f.Seek(p, 0)
return f.Slice(n), p
}
示例4: xrefReadStream
// xrefReadStream() reads the xref stream(s) of a PDF file. This is not recursive
// in favour of not to have to keep track of already used starting points
// for xrefs.
func xrefReadStream(f fancy.Reader, p int) (xr map[int]int, r [][2]int, trailer DictionaryT) {
s := _Bytes
xr = map[int]int{}
r = [][2]int{}
for ok := true; ok; {
f.Seek(int64(p), 0)
ps.Token(f) // skip "xref"
//for {
m := tuple(f, 2)
if string(m[1]) != "obj" {
util.Logf("unexpected %q\n", m)
return nil, nil, nil
}
s, _ = ps.Token(f)
dic := Dictionary(s)
if trailer == nil {
trailer = dic
}
s, ok = dic["/Prev"]
p = num(s)
s, _ = ps.Token(f)
if string(s) != "stream" {
util.Log("not a stream", s)
return nil, nil, nil
}
ps.SkipLE(f)
for k, v := range dic {
util.Logf("%s %s", k, v)
}
size := num(dic["/Size"])
index := []int{0, size}
if _, ok := dic["/Index"]; ok {
a := Array(dic["/Index"])
index[0] = num(a[0])
index[1] = num(a[1])
// can len(index) be != 2 ?
}
l := num(dic["/Length"])
xref := f.Slice(l)
w := Array(dic["/W"])
if len(w) != 3 {
util.Log("unexpected /W", w)
}
fl1 := num(w[0])
fl2 := num(w[1])
fl3 := num(w[2])
width := fl1 + fl2 + fl3
xref = decodeStream(dic, xref)
s, _ = ps.Token(f) // endstream
s, _ = ps.Token(f) // endobj
pos := index[0]
for i := 0; i < len(xref); i += width {
ent := xref[i : i+width]
f1 := bnum(ent[0:fl1])
f2 := bnum(ent[fl1 : fl1+fl2])
f3 := bnum(ent[fl1+fl2:])
switch f1 {
case 0:
// free object
util.Log("free", f2, f3)
// delete(r, f2)
case 1:
// regular object
util.Log("ref", pos, f3, f2)
xr[pos] = f2
case 2:
// compressed object
util.Log("cref", pos, f2, f3)
r = append(r, [2]int{f2, f3})
}
pos += 1
}
//}
}
//.........這裏部分代碼省略.........