summaryrefslogtreecommitdiff
path: root/util.go
blob: be25f7e78e4c2957833053198c6e97f582e90b14 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
/*
 * 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"
	// "github.com/davecgh/go-spew/spew"
	"bufio"
	"io"
	"math"
	"os"
	"path/filepath"
	"strings"
)

func round(f float64) int {
	if f < 0 {
		return -int(math.Floor(-f + 0.5))
	}
	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 Reader
func bufferFromReader(r io.Reader) (b *bytes.Buffer, err error) {
	b = new(bytes.Buffer)
	_, err = b.ReadFrom(r)
	return
}

// Returns true if the two specified float slices are equal
func slicesEqual(a, b []float64) bool {
	if len(a) != len(b) {
		return false
	}
	for i := range a {
		if a[i] != b[i] {
			return false
		}
	}
	return true
}

// Returns a zlib-compressed copy of the specified byte array
func sliceCompress(data []byte) []byte {
	var buf bytes.Buffer
	cmp, _ := zlib.NewWriterLevel(&buf, zlib.BestSpeed)
	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 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)
}

// Return a if cnd is true, otherwise b
func intIf(cnd bool, a, b int) int {
	if cnd {
		return a
	}
	return b
}

// Return aStr if cnd is true, otherwise bStr
func strIf(cnd bool, aStr, bStr string) string {
	if cnd {
		return aStr
	}
	return bStr
}

// Dump the internals of the specified values
// func dump(fileStr string, a ...interface{}) {
// 	fl, err := os.OpenFile(fileStr, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
// 	if err == nil {
// 		fmt.Fprintf(fl, "----------------\n")
// 		spew.Fdump(fl, a...)
// 		fl.Close()
// 	}
// }

func repClosure(m map[rune]byte) func(string) string {
	var buf bytes.Buffer
	return func(str string) string {
		var ch byte
		var ok bool
		buf.Truncate(0)
		for _, r := range str {
			if r < 0x80 {
				ch = byte(r)
			} else {
				ch, ok = m[r]
				if !ok {
					ch = byte('.')
				}
			}
			buf.WriteByte(ch)
		}
		return buf.String()
	}
}

// UnicodeTranslator returns a function that can be used to translate, where
// possible, utf-8 strings to a form that is compatible with the specified code
// page. The returned function accepts a string and returns a string.
//
// r is a reader that should read a buffer made up of content lines that
// pertain to the code page of interest. Each line is made up of three
// whitespace separated fields. The first begins with "!" and is followed by
// two hexadecimal digits that identify the glyph position in the code page of
// interest. The second field begins with "U+" and is followed by the unicode
// code point value. The third is the glyph name. A number of these code page
// map files are packaged with the gfpdf library in the font directory.
//
// An error occurs only if a line is read that does not conform to the expected
// format. In this case, the returned function is valid but does not perform
// any rune translation.
func UnicodeTranslator(r io.Reader) (f func(string) string, err error) {
	m := make(map[rune]byte)
	var uPos, cPos uint32
	var lineStr, nameStr string
	sc := bufio.NewScanner(r)
	for sc.Scan() {
		lineStr = sc.Text()
		lineStr = strings.TrimSpace(lineStr)
		if len(lineStr) > 0 {
			_, err = fmt.Sscanf(lineStr, "!%2X U+%4X %s", &cPos, &uPos, &nameStr)
			if err == nil {
				if cPos >= 0x80 {
					m[rune(uPos)] = byte(cPos)
				}
			}
		}
	}
	if err == nil {
		f = repClosure(m)
	} else {
		f = func(s string) string {
			return s
		}
	}
	return
}

// UnicodeTranslatorFromFile returns a function that can be used to translate,
// where possible, utf-8 strings to a form that is compatible with the
// specified code page. See UnicodeTranslator for more details.
//
// fileStr identifies a font descriptor file that maps glyph positions to names.
//
// If an error occurs reading the file, the returned function is valid but does
// not perform any rune translation.
func UnicodeTranslatorFromFile(fileStr string) (f func(string) string, err error) {
	var fl *os.File
	fl, err = os.Open(fileStr)
	if err == nil {
		f, err = UnicodeTranslator(fl)
		fl.Close()
	} else {
		f = func(s string) string {
			return s
		}
	}
	return
}

// UnicodeTranslatorFromDescriptor returns a function that can be used to
// translate, where possible, utf-8 strings to a form that is compatible with
// the specified code page. See UnicodeTranslator for more details.
//
// cpStr identifies a code page. A descriptor file in the font directory, set
// with the fontDirStr argument in the call to New(), should have this name
// plus the extension ".map". If cpStr is empty, it will be replaced with
// "cp1252", the gofpdf code page default.
//
// If an error occurs reading the descriptor, the returned function is valid
// but does not perform any rune translation.
//
// See tutorial 23 for an example of this function.
func (f *Fpdf) UnicodeTranslatorFromDescriptor(cpStr string) (rep func(string) string) {
	var str string
	var ok bool
	if f.err != nil {
		return
	}
	if len(cpStr) == 0 {
		cpStr = "cp1252"
	}
	str, ok = embeddedMapList[cpStr]
	if ok {
		rep, f.err = UnicodeTranslator(strings.NewReader(str))
	} else {
		rep, f.err = UnicodeTranslatorFromFile(filepath.Join(f.fontpath, cpStr) + ".map")
	}
	return
}