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fsread.go
62 lines (51 loc) · 1.43 KB
/
fsread.go
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// Package filesystem - Content managed by Project Forge, see [projectforge.md] for details.
package filesystem
import "github.com/pkg/errors"
func (f *FileSystem) PeekFile(path string, maxSize int) ([]byte, error) {
file, err := f.f.Open(f.getPath(path))
if err != nil {
return nil, errors.Wrapf(err, "unable to open file [%s]", path)
}
defer func() { _ = file.Close() }()
if stat, _ := file.Stat(); stat.Size() == 0 {
return nil, nil
}
b := make([]byte, maxSize)
size, err := file.Read(b)
if err != nil {
return nil, errors.Wrapf(err, "unable to read file [%s]", path)
}
return b[:size], nil
}
func (f *FileSystem) Size(path string) int {
file, err := f.f.Open(f.getPath(path))
if err != nil {
return -1
}
defer func() { _ = file.Close() }()
stat, _ := file.Stat()
if stat == nil {
return -1
}
return int(stat.Size())
}
func (f *FileSystem) ReadFile(path string) ([]byte, error) {
file, err := f.f.Open(f.getPath(path))
if err != nil {
return nil, errors.Wrapf(err, "unable to open file [%s]", path)
}
defer func() { _ = file.Close() }()
stat, _ := file.Stat()
if stat.Size() == 0 {
return nil, nil
}
b := make([]byte, stat.Size())
size, err := file.Read(b)
if err != nil {
return nil, errors.Wrapf(err, "unable to read file [%s]", path)
}
if int64(size) != stat.Size() {
return nil, errors.Wrapf(err, "file [%s] size [%d] does not match expected size [%d]", path, size, stat.Size())
}
return b, nil
}