pdf

package module
v0.0.0-...-41a1728 Latest Latest
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 Go to latest Published: Feb 16, 2025 License: BSD-3-Clause Imports: 17 Imported by: 0

README

forked from https://github.com/rsc/pdf

Documentation

Overview

Package pdf implements reading of PDF files.

Overview

PDF is Adobe's Portable Document Format, ubiquitous on the internet. A PDF document is a complex data format built on a fairly simple structure. This package exposes the simple structure along with some wrappers to extract basic information. If more complex information is needed, it is possible to extract that information by interpreting the structure exposed by this package.

Specifically, a PDF is a data structure built from Values, each of which has one of the following Kinds: 

Null, for the null object.
Integer, for an integer.
Real, for a floating-point number.
Bool, for a boolean value.
Name, for a name constant (as in /Helvetica).
String, for a string constant.
Dict, for a dictionary of name-value pairs.
Array, for an array of values.
Stream, for an opaque data stream and associated header dictionary.

The accessors on Value—Int64, Float64, Bool, Name, and so on—return a view of the data as the given type. When there is no appropriate view, the accessor returns a zero result. For example, the Name accessor returns the empty string if called on a Value v for which v.Kind() != Name. Returning zero values this way, especially from the Dict and Array accessors, which themselves return Values, makes it possible to traverse a PDF quickly without writing any error checking. On the other hand, it means that mistakes can go unreported.

The basic structure of the PDF file is exposed as the graph of Values.

Most richer data structures in a PDF file are dictionaries with specific interpretations of the name-value pairs. The Font and Page wrappers make the interpretation of a specific Value as the corresponding type easier. They are only helpers, though: they are implemented only in terms of the Value API and could be moved outside the package. Equally important, traversal of other PDF data structures can be implemented in other packages as needed.

Example 
package main

import (
	"fmt"
	"github.com/atlas-editor/pdf"
)

func main() {
	fp, _ := pdf.Open("testdata/pdfreference1.0.pdf")
	chars, lines, curves, rects, imgs := 0, 0, 0, 0, 0
	for n := 1; n < fp.NumPage()+1; n++ {
		page := fp.Page(n)
		content := page.Content()
		chars += len(content.Chars)
		lines += len(content.Lines)
		curves += len(content.Curves)
		rects += len(content.Rectangles)
		imgs += len(content.Images)

		if n == 1 {
			for _, ch := range content.Chars[:18] {
				fmt.Print(ch.S)
			}
			fmt.Print("\n\n")
		}
	}

	fmt.Printf("chars=%v\nlines=%v\ncurves=%v\nrectangles=%v\nimages=%v\n==========\ncomponents=%v\n",
		chars, lines, curves, rects, imgs, imgs+rects+chars+lines+curves)

}

Output:

PDFReferenceManual

chars=289172
lines=599
curves=634
rectangles=8251
images=15
==========
components=298671

Index

Examples

Constants

This section is empty.

Variables

View Source 
var Core14Widths = map[string][]float64{
	"Helvetica-BoldOblique": []float64{
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		556.0, 556.0, 556.0, 556.0, 556.0, 556.0, 556.0, 556.0, 556.0, 556.0, 333.0, 333.0, 584.0, 584.0, 584.0, 611.0,
		975.0, 722.0, 722.0, 722.0, 722.0, 667.0, 611.0, 778.0, 722.0, 278.0, 556.0, 722.0, 611.0, 833.0, 722.0, 778.0,
		667.0, 778.0, 722.0, 667.0, 611.0, 722.0, 667.0, 944.0, 667.0, 667.0, 611.0, 333.0, 278.0, 333.0, 584.0, 556.0,
		278.0, 556.0, 611.0, 556.0, 611.0, 556.0, 333.0, 611.0, 611.0, 278.0, 278.0, 556.0, 278.0, 889.0, 611.0, 611.0,
		611.0, 611.0, 389.0, 556.0, 333.0, 611.0, 556.0, 778.0, 556.0, 556.0, 500.0, 389.0, 280.0, 389.0, 584.0, 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,
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		0.0, 333.0, 556.0, 556.0, 167.0, 556.0, 556.0, 556.0, 556.0, 238.0, 500.0, 556.0, 333.0, 333.0, 611.0, 611.0,
		0.0, 556.0, 556.0, 556.0, 278.0, 0.0, 556.0, 350.0, 278.0, 500.0, 500.0, 556.0, 1000.0, 1000.0, 0.0, 611.0,
		0.0, 333.0, 333.0, 333.0, 333.0, 333.0, 333.0, 333.0, 333.0, 0.0, 333.0, 333.0, 0.0, 333.0, 333.0, 333.0,
		1000.0, 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, 1000.0, 0.0, 370.0, 0.0, 0.0, 0.0, 0.0, 611.0, 778.0, 1000.0, 365.0, 0.0, 0.0, 0.0, 0.0,
		0.0, 889.0, 0.0, 0.0, 0.0, 278.0, 0.0, 0.0, 278.0, 611.0, 944.0, 611.0, 0.0, 0.0, 0.0, 556.0,
	},
	"ZapfDingbats": []float64{
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		911.0, 945.0, 974.0, 755.0, 846.0, 762.0, 761.0, 571.0, 677.0, 763.0, 760.0, 759.0, 754.0, 494.0, 552.0, 537.0,
		577.0, 692.0, 786.0, 788.0, 788.0, 790.0, 793.0, 794.0, 816.0, 823.0, 789.0, 841.0, 823.0, 833.0, 816.0, 831.0,
		923.0, 744.0, 723.0, 749.0, 790.0, 792.0, 695.0, 776.0, 768.0, 792.0, 759.0, 707.0, 708.0, 682.0, 701.0, 826.0,
		815.0, 789.0, 789.0, 707.0, 687.0, 696.0, 689.0, 786.0, 787.0, 713.0, 791.0, 785.0, 791.0, 873.0, 761.0, 762.0,
		762.0, 759.0, 759.0, 892.0, 892.0, 788.0, 784.0, 438.0, 138.0, 277.0, 415.0, 392.0, 392.0, 668.0, 668.0, 0.0,
		390.0, 390.0, 317.0, 317.0, 276.0, 276.0, 509.0, 509.0, 410.0, 410.0, 234.0, 234.0, 334.0, 334.0, 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, 732.0, 544.0, 544.0, 910.0, 667.0, 760.0, 760.0, 776.0, 595.0, 694.0, 626.0, 788.0, 788.0, 788.0, 788.0,
		788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0,
		788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0, 788.0,
		788.0, 788.0, 788.0, 788.0, 894.0, 838.0, 1016.0, 458.0, 748.0, 924.0, 748.0, 918.0, 927.0, 928.0, 928.0, 834.0,
		873.0, 828.0, 924.0, 924.0, 917.0, 930.0, 931.0, 463.0, 883.0, 836.0, 836.0, 867.0, 867.0, 696.0, 696.0, 874.0,
		0.0, 874.0, 760.0, 946.0, 771.0, 865.0, 771.0, 888.0, 967.0, 888.0, 831.0, 873.0, 927.0, 970.0, 918.0, 0.0,
	},
	"Helvetica-Bold": []float64{
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		278.0, 333.0, 474.0, 556.0, 556.0, 889.0, 722.0, 278.0, 333.0, 333.0, 389.0, 584.0, 278.0, 333.0, 278.0, 278.0,
		556.0, 556.0, 556.0, 556.0, 556.0, 556.0, 556.0, 556.0, 556.0, 556.0, 333.0, 333.0, 584.0, 584.0, 584.0, 611.0,
		975.0, 722.0, 722.0, 722.0, 722.0, 667.0, 611.0, 778.0, 722.0, 278.0, 556.0, 722.0, 611.0, 833.0, 722.0, 778.0,
		667.0, 778.0, 722.0, 667.0, 611.0, 722.0, 667.0, 944.0, 667.0, 667.0, 611.0, 333.0, 278.0, 333.0, 584.0, 556.0,
		278.0, 556.0, 611.0, 556.0, 611.0, 556.0, 333.0, 611.0, 611.0, 278.0, 278.0, 556.0, 278.0, 889.0, 611.0, 611.0,
		611.0, 611.0, 389.0, 556.0, 333.0, 611.0, 556.0, 778.0, 556.0, 556.0, 500.0, 389.0, 280.0, 389.0, 584.0, 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, 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, 333.0, 556.0, 556.0, 167.0, 556.0, 556.0, 556.0, 556.0, 238.0, 500.0, 556.0, 333.0, 333.0, 611.0, 611.0,
		0.0, 556.0, 556.0, 556.0, 278.0, 0.0, 556.0, 350.0, 278.0, 500.0, 500.0, 556.0, 1000.0, 1000.0, 0.0, 611.0,
		0.0, 333.0, 333.0, 333.0, 333.0, 333.0, 333.0, 333.0, 333.0, 0.0, 333.0, 333.0, 0.0, 333.0, 333.0, 333.0,
		1000.0, 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, 1000.0, 0.0, 370.0, 0.0, 0.0, 0.0, 0.0, 611.0, 778.0, 1000.0, 365.0, 0.0, 0.0, 0.0, 0.0,
		0.0, 889.0, 0.0, 0.0, 0.0, 278.0, 0.0, 0.0, 278.0, 611.0, 944.0, 611.0, 0.0, 0.0, 0.0, 556.0,
	},
	"Courier-Oblique": []float64{
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		600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0,
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		600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0,
		600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0,
		600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 0.0,
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	},
	"Courier": []float64{
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		600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0,
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		600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0,
		600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0,
		600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0,
		600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 0.0,
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		0.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 0.0, 600.0, 600.0, 0.0, 600.0, 600.0, 600.0,
		600.0, 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, 600.0, 0.0, 600.0, 0.0, 0.0, 0.0, 0.0, 600.0, 600.0, 600.0, 600.0, 0.0, 0.0, 0.0, 0.0,
		0.0, 600.0, 0.0, 0.0, 0.0, 600.0, 0.0, 0.0, 600.0, 600.0, 600.0, 600.0, 0.0, 0.0, 0.0, 600.0,
	},
	"Helvetica": []float64{
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		556.0, 556.0, 556.0, 556.0, 556.0, 556.0, 556.0, 556.0, 556.0, 556.0, 278.0, 278.0, 584.0, 584.0, 584.0, 556.0,
		1015.0, 667.0, 667.0, 722.0, 722.0, 667.0, 611.0, 778.0, 722.0, 278.0, 500.0, 667.0, 556.0, 833.0, 722.0, 778.0,
		667.0, 778.0, 722.0, 667.0, 611.0, 722.0, 667.0, 944.0, 667.0, 667.0, 611.0, 278.0, 278.0, 278.0, 469.0, 556.0,
		222.0, 556.0, 556.0, 500.0, 556.0, 556.0, 278.0, 556.0, 556.0, 222.0, 222.0, 500.0, 222.0, 833.0, 556.0, 556.0,
		556.0, 556.0, 333.0, 500.0, 278.0, 556.0, 500.0, 722.0, 500.0, 500.0, 500.0, 334.0, 260.0, 334.0, 584.0, 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,
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		0.0, 556.0, 556.0, 556.0, 278.0, 0.0, 537.0, 350.0, 222.0, 333.0, 333.0, 556.0, 1000.0, 1000.0, 0.0, 611.0,
		0.0, 333.0, 333.0, 333.0, 333.0, 333.0, 333.0, 333.0, 333.0, 0.0, 333.0, 333.0, 0.0, 333.0, 333.0, 333.0,
		1000.0, 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, 1000.0, 0.0, 370.0, 0.0, 0.0, 0.0, 0.0, 556.0, 778.0, 1000.0, 365.0, 0.0, 0.0, 0.0, 0.0,
		0.0, 889.0, 0.0, 0.0, 0.0, 278.0, 0.0, 0.0, 222.0, 611.0, 944.0, 611.0, 0.0, 0.0, 0.0, 556.0,
	},
	"Symbol": []float64{
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		250.0, 333.0, 713.0, 500.0, 549.0, 833.0, 778.0, 439.0, 333.0, 333.0, 500.0, 549.0, 250.0, 549.0, 250.0, 278.0,
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		600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 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, 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, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0,
		0.0, 600.0, 600.0, 600.0, 600.0, 0.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 0.0, 600.0,
		0.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 600.0, 0.0, 600.0, 600.0, 0.0, 600.0, 600.0, 600.0,
		600.0, 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, 600.0, 0.0, 600.0, 0.0, 0.0, 0.0, 0.0, 600.0, 600.0, 600.0, 600.0, 0.0, 0.0, 0.0, 0.0,
		0.0, 600.0, 0.0, 0.0, 0.0, 600.0, 0.0, 0.0, 600.0, 600.0, 600.0, 600.0, 0.0, 0.0, 0.0, 600.0,
	},
}
View Source 
var ErrInvalidPassword = fmt.Errorf("encrypted PDF: invalid password")

Functions

func Interpret 

func Interpret(strm Value, do func(stk *Stack, op string))

Interpret interprets the content in a stream as a basic PostScript program, pushing values onto a stack and then calling the do function to execute operators. The do function may push or pop values from the stack as needed to implement op.

Interpret handles the operators "dict", "currentdict", "begin", "end", "def", and "pop" itself.

Interpret is not a full-blown PostScript interpreter. Its job is to handle the very limited PostScript found in certain supporting file formats embedded in PDF files, such as cmap files that describe the mapping from font code points to Unicode code points.

There is no support for executable blocks, among other limitations.

Types

type Char 

type Char struct {
	Font     string  // the font used
	FontSize float64 // the font size, in points (1/72 of an inch)
	X        float64 // the X coordinate, in points, increasing left to right
	Y        float64 // the Y coordinate, in points, increasing bottom to top
	W        float64 // the width of the char, in points
	S        string  // the actual UTF-8 text
}

A Char represents a single piece of text drawn on a page.

type Content 

type Content struct {
	Chars      []Char
	Rectangles []Rectangle
	Lines      []Line
	Curves     []Curve
	Images     []Image
}

Content describes the basic content on a page: the text and any drawn rectangles.

type Curve 

type Curve struct {
	Segments []Segment
}

A Curve represents a general non-rectangle non-line curve .

type Font 

type Font struct {
	V Value
}

A Font represent a font in a PDF file. The methods interpret a Font dictionary stored in V.

func (Font) BaseFont 

func (f Font) BaseFont() string

BaseFont returns the font's name (BaseFont property).

func (Font) Encoder 

func (f Font) Encoder() TextEncoding

Encoder returns the encoding between font code point sequences and UTF-8.

func (Font) FirstChar 

func (f Font) FirstChar() int

FirstChar returns the code point of the first character in the font.

func (Font) LastChar 

func (f Font) LastChar() int

LastChar returns the code point of the last character in the font.

func (Font) Width 

func (f Font) Width(code int) float64

Width returns the width of the given code point.

func (Font) Widths 

func (f Font) Widths() []float64

Widths returns the widths of the glyphs in the font. In a well-formed PDF, len(f.Widths()) == f.LastChar()+1 - f.FirstChar().

type Image 

type Image struct {
	P0, P1, P2, P3 Point

	Data io.ReadCloser
	// contains filtered or unexported fields
}

An Image represents an embedded image with its anchor points wrt to the document's media box.

type Interpreter 

type Interpreter struct {
	// contains filtered or unexported fields
}

func NewInterpreter 

func NewInterpreter(rsrcs Value) *Interpreter

func (*Interpreter) InterpretContentStream 

func (interp *Interpreter) InterpretContentStream(strm Value) Content

type Line 

type Line struct {
	X, Y Point
}

A Line represents a line.

type Number 

type Number interface {
	~int | ~int8 | ~int16 | ~int32 | ~int64 | ~float32 | ~float64
}

type Outline 

type Outline struct {
	Title string    // title for this element
	Child []Outline // child elements
}

An Outline is a tree describing the outline (also known as the table of contents) of a document.

type Page 

type Page struct {
	V Value
}

A Page represent a single page in a PDF file. The methods interpret a Page dictionary stored in V.

func (Page) Content 

func (p Page) Content() Content

Content returns the page's content.

func (Page) Font 

func (p Page) Font(name string) Font

Font returns the font with the given name associated with the page.

func (Page) Fonts 

func (p Page) Fonts() []string

Fonts returns a list of the fonts associated with the page.

func (Page) MediaBox 

func (p Page) MediaBox() (float64, float64, float64, float64)

func (Page) Resources 

func (p Page) Resources() Value

Resources returns the resources dictionary associated with the page.

type Point 

type Point struct {
	X float64
	Y float64
}

A Point represents an X, Y pair.

type Reader 

type Reader struct {
	// contains filtered or unexported fields
}

A Reader is a single PDF file open for reading.

func NewReader 

func NewReader(f ReaderAtCloser, size int64) (*Reader, error)

NewReader opens a file for reading, using the data in f with the given total size.

func NewReaderEncrypted 

func NewReaderEncrypted(f ReaderAtCloser, size int64, pw func() string) (*Reader, error)

NewReaderEncrypted opens a file for reading, using the data in f with the given total size. If the PDF is encrypted, NewReaderEncrypted calls pw repeatedly to obtain passwords to try. If pw returns the empty string, NewReaderEncrypted stops trying to decrypt the file and returns an error.

func Open 

func Open(file string) (*Reader, error)

Open opens a file for reading.

func (*Reader) Close 

func (r *Reader) Close() error

Close closes the underlying ReaderAtCloser of the Reader.

func (*Reader) NumPage 

func (r *Reader) NumPage() int

NumPage returns the number of pages in the PDF file.

func (*Reader) Outline 

func (r *Reader) Outline() Outline

Outline returns the document outline. The Outline returned is the root of the outline tree and typically has no Title itself. That is, the children of the returned root are the top-level entries in the outline.

func (*Reader) Page 

func (r *Reader) Page(num int) Page

Page returns the page for the given page number. Page numbers are indexed starting at 1, not 0. If the page is not found, Page returns a Page with p.V.IsNull().

func (*Reader) Trailer 

func (r *Reader) Trailer() Value

Trailer returns the file's Trailer value.

type ReaderAtCloser 

type ReaderAtCloser interface {
	io.ReaderAt
	io.Closer
}

ReaderAtCloser combines the io.ReaderAt and io.Closer interfaces.

type Rectangle 

type Rectangle struct {
	X, Y, W, H float64
}

A Rectangle represents a rectangle.

type Segment 

type Segment struct {
	Type       string
	Parameters []float64
}

A Segment represents a path's segment, see Table 4.9 (Chap. 4, PDF 1.7 Reference, 6th Ed.).

type Stack 

type Stack struct {
	// contains filtered or unexported fields
}

A Stack represents a stack of values.

func (*Stack) Len 

func (stk *Stack) Len() int

func (*Stack) Pop 

func (stk *Stack) Pop() Value

func (*Stack) Push 

func (stk *Stack) Push(v Value)

type TextEncoding 

type TextEncoding interface {
	// Decode returns the UTF-8 text corresponding to
	// the sequence of code points in data.
	Decode(raw string) (text string)
}

A TextEncoding represents a mapping between font code points and UTF-8 text.

type TextHorizontal 

type TextHorizontal []Char

TextHorizontal implements sort.Interface for sorting a slice of Text values in horizontal order, left to right, and then top to bottom within a column.

func (TextHorizontal) Len 

func (x TextHorizontal) Len() int

func (TextHorizontal) Less 

func (x TextHorizontal) Less(i, j int) bool

func (TextHorizontal) Swap 

func (x TextHorizontal) Swap(i, j int)

type TextVertical 

type TextVertical []Char

TextVertical implements sort.Interface for sorting a slice of Text values in vertical order, top to bottom, and then left to right within a line.

func (TextVertical) Len 

func (x TextVertical) Len() int

func (TextVertical) Less 

func (x TextVertical) Less(i, j int) bool

func (TextVertical) Swap 

func (x TextVertical) Swap(i, j int)

type Value 

type Value struct {
	// contains filtered or unexported fields
}

A Value is a single PDF value, such as an integer, dictionary, or array. The zero Value is a PDF null (Kind() == Null, IsNull() = true).

func (Value) Bool 

func (v Value) Bool() bool

Bool returns v's boolean value. If v.Kind() != Bool, Bool returns false.

func (Value) Float64 

func (v Value) Float64() float64

Float64 returns v's float64 value, converting from integer if necessary. If v.Kind() != Float64 and v.Kind() != Int64, Float64 returns 0.

func (Value) Index 

func (v Value) Index(i int) Value

Index returns the i'th element in the array v. If v.Kind() != Array or if i is outside the array bounds, Index returns a null Value.

func (Value) Int64 

func (v Value) Int64() int64

Int64 returns v's int64 value. If v.Kind() != Int64, Int64 returns 0.

func (Value) IsNull 

func (v Value) IsNull() bool

IsNull reports whether the value is a null. It is equivalent to Kind() == Null.

func (Value) Key 

func (v Value) Key(key string) Value

Key returns the value associated with the given name key in the dictionary v. Like the result of the Name method, the key should not include a leading slash. If v is a stream, Key applies to the stream's header dictionary. If v.Kind() != Dict and v.Kind() != Stream, Key returns a null Value.

func (Value) Keys 

func (v Value) Keys() []string

Keys returns a sorted list of the keys in the dictionary v. If v is a stream, Keys applies to the stream's header dictionary. If v.Kind() != Dict and v.Kind() != Stream, Keys returns nil.

func (Value) Kind 

func (v Value) Kind() ValueKind

Kind reports the kind of value underlying v.

func (Value) Len 

func (v Value) Len() int

Len returns the length of the array v. If v.Kind() != Array, Len returns 0.

func (Value) Name 

func (v Value) Name() string

Name returns v's name value. If v.Kind() != Name, Name returns the empty string. The returned name does not include the leading slash: if v corresponds to the name written using the syntax /Helvetica, Name() == "Helvetica".

func (Value) RawString 

func (v Value) RawString() string

RawString returns v's string value. If v.Kind() != String, RawString returns the empty string.

func (Value) Reader 

func (v Value) Reader() io.ReadCloser

Reader returns the data contained in the stream v. If v.Kind() is not a stream or an array of streams, Reader returns a ReadCloser that responds to all reads with a “stream not present” error.

func (Value) String 

func (v Value) String() string

String returns a textual representation of the value v. Note that String is not the accessor for values with Kind() == String. To access such values, see RawString, Text, and TextFromUTF16.

func (Value) Text 

func (v Value) Text() string

Text returns v's string value interpreted as a “text string” (defined in the PDF spec) and converted to UTF-8. If v.Kind() != String, Text returns the empty string.

func (Value) TextFromUTF16 

func (v Value) TextFromUTF16() string

TextFromUTF16 returns v's string value interpreted as big-endian UTF-16 and then converted to UTF-8. If v.Kind() != String or if the data is not valid UTF-16, TextFromUTF16 returns the empty string.

type ValueKind 

type ValueKind int

A ValueKind specifies the kind of data underlying a Value. 

const (
	Null ValueKind = iota
	Bool
	Integer
	Real
	String
	Name
	Dict
	Array
	Stream
)

The PDF value kinds.

Notes

Bugs

  • The package is incomplete, although it has been used successfully on some large real-world PDF files.

  • The support for reading encrypted files is weak.

  • The Value API does not support error reporting. The intent is to allow users to set an error reporting callback in Reader, but that code has not been implemented.

Source Files

View all Source files

Directories

Path Synopsis
Pdfpasswd searches for the password for an encrypted PDF by trying all strings over a given alphabet up to a given length.
 Pdfpasswd searches for the password for an encrypted PDF by trying all strings over a given alphabet up to a given length.
Pdftext extracts text from a PDF file, optionally specifying a page number.
 Pdftext extracts text from a PDF file, optionally specifying a page number.
Pdfvis visualizes the layout of a PDF file, optionally specifying a page number.
 Pdfvis visualizes the layout of a PDF file, optionally specifying a page number.

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