230 lines
6.2 KiB
Go
230 lines
6.2 KiB
Go
// Copyright 2016 - 2019 The excelize Authors. All rights reserved. Use of
|
|
// this source code is governed by a BSD-style license that can be found in
|
|
// the LICENSE file.
|
|
//
|
|
// Package excelize providing a set of functions that allow you to write to
|
|
// and read from XLSX files. Support reads and writes XLSX file generated by
|
|
// Microsoft Excel™ 2007 and later. Support save file without losing original
|
|
// charts of XLSX. This library needs Go version 1.8 or later.
|
|
|
|
package excelize
|
|
|
|
import (
|
|
"archive/zip"
|
|
"bytes"
|
|
"io"
|
|
"log"
|
|
"math"
|
|
"strconv"
|
|
"strings"
|
|
"unicode"
|
|
)
|
|
|
|
// ReadZipReader can be used to read an XLSX in memory without touching the
|
|
// filesystem.
|
|
func ReadZipReader(r *zip.Reader) (map[string][]byte, int, error) {
|
|
fileList := make(map[string][]byte)
|
|
worksheets := 0
|
|
for _, v := range r.File {
|
|
fileList[v.Name] = readFile(v)
|
|
if len(v.Name) > 18 {
|
|
if v.Name[0:19] == "xl/worksheets/sheet" {
|
|
worksheets++
|
|
}
|
|
}
|
|
}
|
|
return fileList, worksheets, nil
|
|
}
|
|
|
|
// readXML provides a function to read XML content as string.
|
|
func (f *File) readXML(name string) []byte {
|
|
if content, ok := f.XLSX[name]; ok {
|
|
return content
|
|
}
|
|
return []byte{}
|
|
}
|
|
|
|
// saveFileList provides a function to update given file content in file list
|
|
// of XLSX.
|
|
func (f *File) saveFileList(name string, content []byte) {
|
|
newContent := make([]byte, 0, len(XMLHeader)+len(content))
|
|
newContent = append(newContent, []byte(XMLHeader)...)
|
|
newContent = append(newContent, content...)
|
|
f.XLSX[name] = newContent
|
|
}
|
|
|
|
// Read file content as string in a archive file.
|
|
func readFile(file *zip.File) []byte {
|
|
rc, err := file.Open()
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
buff := bytes.NewBuffer(nil)
|
|
_, _ = io.Copy(buff, rc)
|
|
rc.Close()
|
|
return buff.Bytes()
|
|
}
|
|
|
|
// ToAlphaString provides a function to convert integer to Excel sheet column
|
|
// title. For example convert 36 to column title AK:
|
|
//
|
|
// excelize.ToAlphaString(36)
|
|
//
|
|
func ToAlphaString(value int) string {
|
|
if value < 0 {
|
|
return ""
|
|
}
|
|
var ans string
|
|
i := value + 1
|
|
for i > 0 {
|
|
ans = string((i-1)%26+65) + ans
|
|
i = (i - 1) / 26
|
|
}
|
|
return ans
|
|
}
|
|
|
|
// TitleToNumber provides a function to convert Excel sheet column title to
|
|
// int (this function doesn't do value check currently). For example convert
|
|
// AK and ak to column title 36:
|
|
//
|
|
// excelize.TitleToNumber("AK")
|
|
// excelize.TitleToNumber("ak")
|
|
//
|
|
func TitleToNumber(s string) int {
|
|
weight := 0.0
|
|
sum := 0
|
|
for i := len(s) - 1; i >= 0; i-- {
|
|
ch := int(s[i])
|
|
if int(s[i]) >= int('a') && int(s[i]) <= int('z') {
|
|
ch = int(s[i]) - 32
|
|
}
|
|
sum = sum + (ch-int('A')+1)*int(math.Pow(26, weight))
|
|
weight++
|
|
}
|
|
return sum - 1
|
|
}
|
|
|
|
// letterOnlyMapF is used in conjunction with strings.Map to return only the
|
|
// characters A-Z and a-z in a string.
|
|
func letterOnlyMapF(rune rune) rune {
|
|
switch {
|
|
case 'A' <= rune && rune <= 'Z':
|
|
return rune
|
|
case 'a' <= rune && rune <= 'z':
|
|
return rune - 32
|
|
}
|
|
return -1
|
|
}
|
|
|
|
// intOnlyMapF is used in conjunction with strings.Map to return only the
|
|
// numeric portions of a string.
|
|
func intOnlyMapF(rune rune) rune {
|
|
if rune >= 48 && rune < 58 {
|
|
return rune
|
|
}
|
|
return -1
|
|
}
|
|
|
|
// boolPtr returns a pointer to a bool with the given value.
|
|
func boolPtr(b bool) *bool { return &b }
|
|
|
|
// defaultTrue returns true if b is nil, or the pointed value.
|
|
func defaultTrue(b *bool) bool {
|
|
if b == nil {
|
|
return true
|
|
}
|
|
return *b
|
|
}
|
|
|
|
// axisLowerOrEqualThan returns true if axis1 <= axis2 axis1/axis2 can be
|
|
// either a column or a row axis, e.g. "A", "AAE", "42", "1", etc.
|
|
//
|
|
// For instance, the following comparisons are all true:
|
|
//
|
|
// "A" <= "B"
|
|
// "A" <= "AA"
|
|
// "B" <= "AA"
|
|
// "BC" <= "ABCD" (in a XLSX sheet, the BC col comes before the ABCD col)
|
|
// "1" <= "2"
|
|
// "2" <= "11" (in a XLSX sheet, the row 2 comes before the row 11)
|
|
// and so on
|
|
func axisLowerOrEqualThan(axis1, axis2 string) bool {
|
|
if len(axis1) < len(axis2) {
|
|
return true
|
|
} else if len(axis1) > len(axis2) {
|
|
return false
|
|
} else {
|
|
return axis1 <= axis2
|
|
}
|
|
}
|
|
|
|
// getCellColRow returns the two parts of a cell identifier (its col and row)
|
|
// as strings
|
|
//
|
|
// For instance:
|
|
//
|
|
// "C220" => "C", "220"
|
|
// "aaef42" => "aaef", "42"
|
|
// "" => "", ""
|
|
func getCellColRow(cell string) (col, row string) {
|
|
for index, rune := range cell {
|
|
if unicode.IsDigit(rune) {
|
|
return cell[:index], cell[index:]
|
|
}
|
|
|
|
}
|
|
|
|
return cell, ""
|
|
}
|
|
|
|
// parseFormatSet provides a method to convert format string to []byte and
|
|
// handle empty string.
|
|
func parseFormatSet(formatSet string) []byte {
|
|
if formatSet != "" {
|
|
return []byte(formatSet)
|
|
}
|
|
return []byte("{}")
|
|
}
|
|
|
|
// namespaceStrictToTransitional provides a method to convert Strict and
|
|
// Transitional namespaces.
|
|
func namespaceStrictToTransitional(content []byte) []byte {
|
|
var namespaceTranslationDic = map[string]string{
|
|
StrictSourceRelationship: SourceRelationship,
|
|
StrictSourceRelationshipChart: SourceRelationshipChart,
|
|
StrictSourceRelationshipComments: SourceRelationshipComments,
|
|
StrictSourceRelationshipImage: SourceRelationshipImage,
|
|
StrictNameSpaceSpreadSheet: NameSpaceSpreadSheet,
|
|
}
|
|
for s, n := range namespaceTranslationDic {
|
|
content = bytes.Replace(content, []byte(s), []byte(n), -1)
|
|
}
|
|
return content
|
|
}
|
|
|
|
// genSheetPasswd provides a method to generate password for worksheet
|
|
// protection by given plaintext. When an Excel sheet is being protected with
|
|
// a password, a 16-bit (two byte) long hash is generated. To verify a
|
|
// password, it is compared to the hash. Obviously, if the input data volume
|
|
// is great, numerous passwords will match the same hash. Here is the
|
|
// algorithm to create the hash value:
|
|
//
|
|
// take the ASCII values of all characters shift left the first character 1 bit, the second 2 bits and so on (use only the lower 15 bits and rotate all higher bits, the highest bit of the 16-bit value is always 0 [signed short])
|
|
// XOR all these values
|
|
// XOR the count of characters
|
|
// XOR the constant 0xCE4B
|
|
func genSheetPasswd(plaintext string) string {
|
|
var password int64 = 0x0000
|
|
var charPos uint = 1
|
|
for _, v := range plaintext {
|
|
value := int64(v) << charPos
|
|
charPos++
|
|
rotatedBits := value >> 15 // rotated bits beyond bit 15
|
|
value &= 0x7fff // first 15 bits
|
|
password ^= (value | rotatedBits)
|
|
}
|
|
password ^= int64(len(plaintext))
|
|
password ^= 0xCE4B
|
|
return strings.ToUpper(strconv.FormatInt(password, 16))
|
|
}
|