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xls/workbook.go

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package xls
import (
"bytes"
"encoding/binary"
"io"
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"log"
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"unicode/utf16"
)
type WorkBook struct {
Is5ver bool
Type uint16
Codepage uint16
Xfs []st_xf_data
Fonts []Font
Formats map[uint16]*Format
Sheets []*WorkSheet
Author string
rs io.ReadSeeker
sst []string
continue_utf16 uint16
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}
func newWookBookFromOle2(rs io.ReadSeeker) *WorkBook {
wb := new(WorkBook)
wb.Formats = make(map[uint16]*Format)
// wb.bts = bts
wb.rs = rs
wb.Sheets = make([]*WorkSheet, 0)
wb.Parse(rs)
return wb
}
func (w *WorkBook) Parse(buf io.ReadSeeker) {
bof := new(BOF)
bof_pre := new(BOF)
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// buf := bytes.NewReader(bts)
offset := 0
for {
if err := binary.Read(buf, binary.LittleEndian, bof); err == nil {
bof_pre, bof, offset = w.parseBof(buf, bof, bof_pre, offset)
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} else {
break
}
}
}
func (w *WorkBook) addXf(xf st_xf_data) {
w.Xfs = append(w.Xfs, xf)
}
func (w *WorkBook) addFont(font *FontInfo, buf io.ReadSeeker) {
name := w.get_string(buf, uint16(font.NameB))
w.Fonts = append(w.Fonts, Font{Info: font, Name: name})
}
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func (w *WorkBook) addFormat(format *Format) {
w.Formats[format.Head.Index] = format
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}
func (wb *WorkBook) parseBof(buf io.ReadSeeker, b *BOF, pre *BOF, offset_pre int) (after *BOF, after_using *BOF, offset int) {
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after = b
after_using = pre
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var bts = make([]byte, b.Size)
binary.Read(buf, binary.LittleEndian, bts)
buf_item := bytes.NewReader(bts)
switch b.Id {
case 0x809:
bif := new(BIFFHeader)
binary.Read(buf_item, binary.LittleEndian, bif)
if bif.Ver != 0x600 {
wb.Is5ver = true
}
wb.Type = bif.Type
case 0x042: // CODEPAGE
binary.Read(buf_item, binary.LittleEndian, &wb.Codepage)
case 0x3c: // CONTINUE
if pre.Id == 0xfc {
var size uint16
var err error
if wb.continue_utf16 > 1 {
size = wb.continue_utf16
wb.continue_utf16 = 0
offset_pre--
} else {
err = binary.Read(buf_item, binary.LittleEndian, &size)
}
for err == nil && offset_pre < len(wb.sst) {
wb.sst[offset_pre] = wb.sst[offset_pre] + wb.get_string(buf_item, size)
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offset_pre++
err = binary.Read(buf_item, binary.LittleEndian, &size)
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}
}
offset = offset_pre
after = pre
after_using = b
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case 0xfc: // SST
info := new(SstInfo)
binary.Read(buf_item, binary.LittleEndian, info)
wb.sst = make([]string, info.Count)
for i := 0; i < int(info.Count); i++ {
var size uint16
if err := binary.Read(buf_item, binary.LittleEndian, &size); err == nil || err == io.EOF {
wb.sst[i] = wb.sst[i] + wb.get_string(buf_item, size)
if err == io.EOF {
offset = i
break
}
}
}
case 0x85: // bOUNDSHEET
var bs = new(boundsheet)
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binary.Read(buf_item, binary.LittleEndian, bs)
// different for BIFF5 and BIFF8
wb.addSheet(bs, buf_item)
case 0x0e0: // XF
if wb.Is5ver {
xf := new(Xf5)
binary.Read(buf_item, binary.LittleEndian, xf)
wb.addXf(xf)
} else {
xf := new(Xf8)
binary.Read(buf_item, binary.LittleEndian, xf)
wb.addXf(xf)
}
case 0x031: // FONT
f := new(FontInfo)
binary.Read(buf_item, binary.LittleEndian, f)
wb.addFont(f, buf_item)
case 0x41E: //FORMAT
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f := new(Format)
binary.Read(buf_item, binary.LittleEndian, &f.Head)
f.str = wb.get_string(buf_item, f.Head.Size)
wb.addFormat(f)
log.Println(f.Head.Index, f.str)
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}
return
}
func (w *WorkBook) get_string(buf io.ReadSeeker, size uint16) string {
var res string
if w.Is5ver {
var bts = make([]byte, size)
buf.Read(bts)
return string(bts)
} else {
var richtext_num uint16
var phonetic_size uint32
var flag byte
binary.Read(buf, binary.LittleEndian, &flag)
if flag&0x8 != 0 {
binary.Read(buf, binary.LittleEndian, &richtext_num)
}
if flag&0x4 != 0 {
binary.Read(buf, binary.LittleEndian, &phonetic_size)
}
if flag&0x1 != 0 {
var bts = make([]uint16, size)
var err error
var i = uint16(0)
for ; i < size && err == nil; i++ {
err = binary.Read(buf, binary.LittleEndian, &bts[i])
}
runes := utf16.Decode(bts[:i])
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res = string(runes)
if i < size {
w.continue_utf16 = size - i + 1
}
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} else {
var bts = make([]byte, size)
binary.Read(buf, binary.LittleEndian, &bts)
res = string(bts)
}
if flag&0x8 != 0 {
var bts []byte
if w.Is5ver {
bts = make([]byte, 2*richtext_num)
} else {
bts = make([]byte, 4*richtext_num)
}
binary.Read(buf, binary.LittleEndian, bts)
}
if flag&0x4 != 0 {
var bts []byte
bts = make([]byte, phonetic_size)
binary.Read(buf, binary.LittleEndian, bts)
}
}
return res
}
func (w *WorkBook) get_string_from_bytes(bts []byte, size uint16) string {
buf := bytes.NewReader(bts)
return w.get_string(buf, size)
}
func (w *WorkBook) addSheet(sheet *boundsheet, buf io.ReadSeeker) {
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name := w.get_string(buf, uint16(sheet.Name))
w.Sheets = append(w.Sheets, &WorkSheet{bs: sheet, Name: name, wb: w})
}
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//reading a sheet from the compress file to memory, you should call this before you try to get anything from sheet
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func (w *WorkBook) PrepareSheet(sheet *WorkSheet) {
w.rs.Seek(int64(sheet.bs.Filepos), 0)
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sheet.parse(w.rs)
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}
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//helper function to read all cells from file
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func (w *WorkBook) ReadAllCells(max int) (res [][]string) {
res = make([][]string, 0)
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for _, sheet := range w.Sheets {
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if len(res) < max {
max = max - len(res)
w.PrepareSheet(sheet)
if sheet.MaxRow != 0 {
leng := int(sheet.MaxRow) + 1
if max < leng {
leng = max
}
temp := make([][]string, leng)
for k, row := range sheet.Rows {
data := make([]string, 0)
if len(row.Cols) > 0 {
for _, col := range row.Cols {
if uint16(len(data)) <= col.LastCol() {
data = append(data, make([]string, col.LastCol()-uint16(len(data))+1)...)
}
str := col.String(w)
for i := uint16(0); i < col.LastCol()-col.FirstCol()+1; i++ {
data[col.FirstCol()+i] = str[i]
}
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}
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if leng > int(k) {
temp[k] = data
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}
}
}
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res = append(res, temp...)
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}
}
}
return
}