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package js
import (
"bytes"
"compress/gzip"
"encoding/base64"
"github.com/robertkrimen/otto"
)
func btoa(call otto.FunctionCall) otto.Value {
varValue := base64.StdEncoding.EncodeToString([]byte(call.Argument(0).String()))
v, err := otto.ToValue(varValue)
if err != nil {
return ReportError("Could not convert to string: %s", varValue)
}
return v
}
func atob(call otto.FunctionCall) otto.Value {
varValue, err := base64.StdEncoding.DecodeString(call.Argument(0).String())
if err != nil {
return ReportError("Could not decode string: %s", call.Argument(0).String())
}
v, err := otto.ToValue(string(varValue))
if err != nil {
return ReportError("Could not convert to string: %s", varValue)
}
return v
}
func gzipCompress(call otto.FunctionCall) otto.Value {
argv := call.ArgumentList
argc := len(argv)
if argc != 1 {
return ReportError("gzipCompress: expected 1 argument, %d given instead.", argc)
}
uncompressedBytes := []byte(argv[0].String())
var writerBuffer bytes.Buffer
gzipWriter := gzip.NewWriter(&writerBuffer)
_, err := gzipWriter.Write(uncompressedBytes)
if err != nil {
return ReportError("gzipCompress: could not compress data: %s", err.Error())
}
gzipWriter.Close()
compressedBytes := writerBuffer.Bytes()
v, err := otto.ToValue(string(compressedBytes))
if err != nil {
return ReportError("Could not convert to string: %s", err.Error())
}
return v
}
func gzipDecompress(call otto.FunctionCall) otto.Value {
argv := call.ArgumentList
argc := len(argv)
if argc != 1 {
return ReportError("gzipDecompress: expected 1 argument, %d given instead.", argc)
}
compressedBytes := []byte(argv[0].String())
readerBuffer := bytes.NewBuffer(compressedBytes)
gzipReader, err := gzip.NewReader(readerBuffer)
if err != nil {
return ReportError("gzipDecompress: could not create gzip reader: %s", err.Error())
}
var decompressedBuffer bytes.Buffer
_, err = decompressedBuffer.ReadFrom(gzipReader)
if err != nil {
return ReportError("gzipDecompress: could not decompress data: %s", err.Error())
}
decompressedBytes := decompressedBuffer.Bytes()
v, err := otto.ToValue(string(decompressedBytes))
if err != nil {
return ReportError("Could not convert to string: %s", err.Error())
}
return v
}
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