/
reader.go
110 lines (91 loc) · 1.76 KB
/
reader.go
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package deb
import (
"bufio"
"io"
"strings"
)
type PackageReader struct {
scanner *bufio.Scanner
}
type ContentsReader struct {
scanner *bufio.Scanner
}
type Package struct {
Name string
Source string
Filename string
}
type Contents struct {
File string
Packages []string
}
func NewPackageReader(r io.Reader) *PackageReader {
const bufferSize = 128 * 1024
// TODO: unfuckify this
scan := bufio.NewScanner(r)
scan.Buffer(make([]byte, bufferSize), bufferSize)
return &PackageReader{scan}
}
func NewContentsReader(r io.Reader) *ContentsReader {
return &ContentsReader{bufio.NewScanner(r)}
}
func (p *PackageReader) Next() (Package, error) {
var pack Package
// keep scanning until we get a non-empty line
for {
ok := p.scanner.Scan()
if !ok {
if err := p.scanner.Err(); err != nil {
return Package{}, err
}
return Package{}, io.EOF
}
if p.scanner.Text() != "" {
break
}
}
for {
line := p.scanner.Text()
if line == "" {
// end of this package entry
return pack, nil
}
fields := strings.Fields(line)
if len(fields) >= 2 {
key := fields[0]
value := fields[1]
switch key {
case "Package:":
pack.Name = value
case "Filename:":
pack.Filename = value
}
}
ok := p.scanner.Scan()
if !ok {
if err := p.scanner.Err(); err != nil {
return Package{}, err
}
return pack, nil
}
}
}
func (c *ContentsReader) Next() (Contents, error) {
for {
ok := c.scanner.Scan()
if !ok {
if err := c.scanner.Err(); err != nil {
return Contents{}, err
}
return Contents{}, io.EOF
}
line := c.scanner.Text()
fields := strings.Fields(line)
if len(fields) == 2 {
return Contents{
File: fields[0],
Packages: strings.Split(fields[1], ","),
}, nil
}
}
}