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/*
* Copyright (c) 2013 Kurt Jung (Gmail: kurt.w.jung)
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package gofpdf
import (
"bytes"
"compress/zlib"
"fmt"
"math"
"os"
"regexp"
"strings"
)
func round(f float64) int {
if f < 0 {
return -int(math.Floor(-f + 0.5))
} else {
return int(math.Floor(f + 0.5))
}
}
func sprintf(fmtStr string, args ...interface{}) string {
return fmt.Sprintf(fmtStr, args...)
}
// Returns true if the specified normal file exists
func fileExist(filename string) (ok bool) {
info, err := os.Stat(filename)
if err == nil {
if ^os.ModePerm&info.Mode() == 0 {
ok = true
}
}
return ok
}
// Returns the size of the specified file; ok will be false
// if the file does not exist or is not an ordinary file
func fileSize(filename string) (size int64, ok bool) {
info, err := os.Stat(filename)
ok = err == nil
if ok {
size = info.Size()
}
return
}
// Returns a new buffer populated with the contents of the specified file
func bufferFromFile(fileStr string) (b *bytes.Buffer, err error) {
var fl *os.File
fl, err = os.Open(fileStr)
if err != nil {
return
}
defer fl.Close()
b = new(bytes.Buffer)
_, err = b.ReadFrom(fl)
return
}
// Returns a zlib-compressed copy of the specified byte array
func sliceCompress(data []byte) []byte {
var buf bytes.Buffer
cmp := zlib.NewWriter(&buf)
cmp.Write(data)
cmp.Close()
return buf.Bytes()
}
// Returns an uncompressed copy of the specified zlib-compressed byte array
func sliceUncompress(data []byte) (outData []byte, err error) {
inBuf := bytes.NewBuffer(data)
r, err := zlib.NewReader(inBuf)
defer r.Close()
if err == nil {
var outBuf bytes.Buffer
_, err = outBuf.ReadFrom(r)
if err == nil {
outData = outBuf.Bytes()
}
}
return
}
// Convert 'ABCDEFG' to, for example, 'A,BCD,EFG'
func strDelimit(str string, sepstr string, sepcount int) string {
pos := len(str) - sepcount
for pos > 0 {
str = str[:pos] + sepstr + str[pos:]
pos = pos - sepcount
}
return str
}
type htmlSegmentType struct {
cat byte // 'O' open tag, 'C' close tag, 'T' text
str string // Literal text unchanged, tags are lower case
attr map[string]string // Attribute keys are lower case
}
// Returns a list of HTML tags and literal elements. This is done with regular
// expressions, so the result is only marginally better than useless.
// Adapted from http://www.fpdf.org/
func htmlTokenize(htmlStr string) (list []htmlSegmentType) {
list = make([]htmlSegmentType, 0, 16)
htmlStr = strings.Replace(htmlStr, "\n", " ", -1)
htmlStr = strings.Replace(htmlStr, "\r", "", -1)
tagRe, _ := regexp.Compile(`(?U)<.*>`)
attrRe, _ := regexp.Compile(`([^=]+)=["']?([^"']+)`)
capList := tagRe.FindAllStringIndex(htmlStr, -1)
if list != nil {
var seg htmlSegmentType
var parts []string
pos := 0
for _, cap := range capList {
if pos < cap[0] {
seg.cat = 'T'
seg.str = htmlStr[pos:cap[0]]
seg.attr = nil
list = append(list, seg)
}
if htmlStr[cap[0]+1] == '/' {
seg.cat = 'C'
seg.str = strings.ToLower(htmlStr[cap[0]+2 : cap[1]-1])
seg.attr = nil
list = append(list, seg)
} else {
// Extract attributes
parts = strings.Split(htmlStr[cap[0]+1:cap[1]-1], " ")
if len(parts) > 0 {
for j, part := range parts {
if j == 0 {
seg.cat = 'O'
seg.str = strings.ToLower(parts[0])
seg.attr = make(map[string]string)
} else {
attrList := attrRe.FindAllStringSubmatch(part, -1)
if attrList != nil {
for _, attr := range attrList {
seg.attr[strings.ToLower(attr[1])] = attr[2]
}
}
}
}
list = append(list, seg)
}
}
pos = cap[1]
}
if len(htmlStr) > pos {
seg.cat = 'T'
seg.str = htmlStr[pos:]
seg.attr = nil
list = append(list, seg)
}
}
return
}
// Convert UTF-8 to UTF-16BE with BOM; from http://www.fpdf.org/
func utf8toutf16(s string) string {
res := make([]byte, 0, 8)
res = append(res, 0xFE, 0xFF)
nb := len(s)
i := 0
for i < nb {
c1 := byte(s[i])
i++
if c1 >= 224 {
// 3-byte character
c2 := byte(s[i])
i++
c3 := byte(s[i])
i++
res = append(res, ((c1&0x0F)<<4)+((c2&0x3C)>>2),
((c2&0x03)<<6)+(c3&0x3F))
} else if c1 >= 192 {
// 2-byte character
c2 := byte(s[i])
i++
res = append(res, ((c1 & 0x1C) >> 2),
((c1&0x03)<<6)+(c2&0x3F))
} else {
// Single-byte character
res = append(res, 0, c1)
}
}
return string(res)
}
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