60e4a98ab0
The `ToUTF8*` functions were stripping BOM, while BOM is actually valid in UTF8, so the stripping must be optional depending on use case. This does: - Add a options struct to all `ToUTF8*` functions, that by default will strip BOM to preserve existing behaviour - Remove `ToUTF8` function, it was dead code - Rename `ToUTF8WithErr` to `ToUTF8` - Preserve BOM in Monaco Editor - Remove a unnecessary newline in the textarea value. Browsers did ignore it, it seems but it's better not to rely on this behaviour. Fixes: https://github.com/go-gitea/gitea/issues/28743 Related: https://github.com/go-gitea/gitea/issues/6716 which seems to have once introduced a mechanism that strips and re-adds the BOM, but from what I can tell, this mechanism was removed at some point after that PR.
385 lines
23 KiB
Go
385 lines
23 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package charset
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import (
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"bytes"
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"io"
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"strings"
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"testing"
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"code.gitea.io/gitea/modules/setting"
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"github.com/stretchr/testify/assert"
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)
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func resetDefaultCharsetsOrder() {
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defaultDetectedCharsetsOrder := make([]string, 0, len(setting.Repository.DetectedCharsetsOrder))
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for _, charset := range setting.Repository.DetectedCharsetsOrder {
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defaultDetectedCharsetsOrder = append(defaultDetectedCharsetsOrder, strings.ToLower(strings.TrimSpace(charset)))
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}
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setting.Repository.DetectedCharsetScore = map[string]int{}
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i := 0
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for _, charset := range defaultDetectedCharsetsOrder {
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canonicalCharset := strings.ToLower(strings.TrimSpace(charset))
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if _, has := setting.Repository.DetectedCharsetScore[canonicalCharset]; !has {
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setting.Repository.DetectedCharsetScore[canonicalCharset] = i
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i++
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}
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}
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}
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func TestMaybeRemoveBOM(t *testing.T) {
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res := MaybeRemoveBOM([]byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, ConvertOpts{})
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assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, res)
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res = MaybeRemoveBOM([]byte{0xef, 0xbb, 0xbf, 0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, ConvertOpts{})
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assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, res)
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}
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func TestToUTF8(t *testing.T) {
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resetDefaultCharsetsOrder()
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var res string
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var err error
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// Note: golang compiler seems so behave differently depending on the current
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// locale, so some conversions might behave differently. For that reason, we don't
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// depend on particular conversions but in expected behaviors.
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res, err = ToUTF8([]byte{0x41, 0x42, 0x43}, ConvertOpts{})
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assert.NoError(t, err)
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assert.Equal(t, "ABC", res)
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// "áéíóú"
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res, err = ToUTF8([]byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, ConvertOpts{})
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assert.NoError(t, err)
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assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, []byte(res))
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// "áéíóú"
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res, err = ToUTF8([]byte{
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0xef, 0xbb, 0xbf, 0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3,
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0xc3, 0xba,
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}, ConvertOpts{})
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assert.NoError(t, err)
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assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, []byte(res))
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res, err = ToUTF8([]byte{
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0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63,
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0xF3, 0x6D, 0x6F, 0x20, 0xF1, 0x6F, 0x73, 0x41, 0x41, 0x41, 0x2e,
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}, ConvertOpts{})
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assert.NoError(t, err)
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stringMustStartWith(t, "Hola,", res)
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stringMustEndWith(t, "AAA.", res)
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res, err = ToUTF8([]byte{
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0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63,
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0xF3, 0x6D, 0x6F, 0x20, 0x07, 0xA4, 0x6F, 0x73, 0x41, 0x41, 0x41, 0x2e,
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}, ConvertOpts{})
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assert.NoError(t, err)
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stringMustStartWith(t, "Hola,", res)
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stringMustEndWith(t, "AAA.", res)
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res, err = ToUTF8([]byte{
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0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63,
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0xF3, 0x6D, 0x6F, 0x20, 0x81, 0xA4, 0x6F, 0x73, 0x41, 0x41, 0x41, 0x2e,
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}, ConvertOpts{})
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assert.NoError(t, err)
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stringMustStartWith(t, "Hola,", res)
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stringMustEndWith(t, "AAA.", res)
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// Japanese (Shift-JIS)
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// 日属秘ぞしちゅ。
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res, err = ToUTF8([]byte{
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0x93, 0xFA, 0x91, 0xAE, 0x94, 0xE9, 0x82, 0xBC, 0x82, 0xB5, 0x82,
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0xBF, 0x82, 0xE3, 0x81, 0x42,
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}, ConvertOpts{})
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assert.NoError(t, err)
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assert.Equal(t, []byte{
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0xE6, 0x97, 0xA5, 0xE5, 0xB1, 0x9E, 0xE7, 0xA7, 0x98, 0xE3,
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0x81, 0x9E, 0xE3, 0x81, 0x97, 0xE3, 0x81, 0xA1, 0xE3, 0x82, 0x85, 0xE3, 0x80, 0x82,
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},
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[]byte(res))
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res, err = ToUTF8([]byte{0x00, 0x00, 0x00, 0x00}, ConvertOpts{})
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assert.NoError(t, err)
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assert.Equal(t, []byte{0x00, 0x00, 0x00, 0x00}, []byte(res))
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}
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func TestToUTF8WithFallback(t *testing.T) {
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resetDefaultCharsetsOrder()
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// "ABC"
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res := ToUTF8WithFallback([]byte{0x41, 0x42, 0x43}, ConvertOpts{})
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assert.Equal(t, []byte{0x41, 0x42, 0x43}, res)
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// "áéíóú"
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res = ToUTF8WithFallback([]byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, ConvertOpts{})
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assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, res)
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// UTF8 BOM + "áéíóú"
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res = ToUTF8WithFallback([]byte{0xef, 0xbb, 0xbf, 0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, ConvertOpts{})
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assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, res)
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// "Hola, así cómo ños"
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res = ToUTF8WithFallback([]byte{
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0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63,
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0xF3, 0x6D, 0x6F, 0x20, 0xF1, 0x6F, 0x73,
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}, ConvertOpts{})
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assert.Equal(t, []byte{
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0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xC3, 0xAD, 0x20, 0x63,
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0xC3, 0xB3, 0x6D, 0x6F, 0x20, 0xC3, 0xB1, 0x6F, 0x73,
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}, res)
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// "Hola, así cómo "
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minmatch := []byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xC3, 0xAD, 0x20, 0x63, 0xC3, 0xB3, 0x6D, 0x6F, 0x20}
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res = ToUTF8WithFallback([]byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63, 0xF3, 0x6D, 0x6F, 0x20, 0x07, 0xA4, 0x6F, 0x73}, ConvertOpts{})
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// Do not fail for differences in invalid cases, as the library might change the conversion criteria for those
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assert.Equal(t, minmatch, res[0:len(minmatch)])
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res = ToUTF8WithFallback([]byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63, 0xF3, 0x6D, 0x6F, 0x20, 0x81, 0xA4, 0x6F, 0x73}, ConvertOpts{})
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// Do not fail for differences in invalid cases, as the library might change the conversion criteria for those
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assert.Equal(t, minmatch, res[0:len(minmatch)])
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// Japanese (Shift-JIS)
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// "日属秘ぞしちゅ。"
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res = ToUTF8WithFallback([]byte{0x93, 0xFA, 0x91, 0xAE, 0x94, 0xE9, 0x82, 0xBC, 0x82, 0xB5, 0x82, 0xBF, 0x82, 0xE3, 0x81, 0x42}, ConvertOpts{})
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assert.Equal(t, []byte{
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0xE6, 0x97, 0xA5, 0xE5, 0xB1, 0x9E, 0xE7, 0xA7, 0x98, 0xE3,
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0x81, 0x9E, 0xE3, 0x81, 0x97, 0xE3, 0x81, 0xA1, 0xE3, 0x82, 0x85, 0xE3, 0x80, 0x82,
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}, res)
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res = ToUTF8WithFallback([]byte{0x00, 0x00, 0x00, 0x00}, ConvertOpts{})
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assert.Equal(t, []byte{0x00, 0x00, 0x00, 0x00}, res)
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}
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func TestToUTF8DropErrors(t *testing.T) {
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resetDefaultCharsetsOrder()
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// "ABC"
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res := ToUTF8DropErrors([]byte{0x41, 0x42, 0x43}, ConvertOpts{})
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assert.Equal(t, []byte{0x41, 0x42, 0x43}, res)
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// "áéíóú"
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res = ToUTF8DropErrors([]byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, ConvertOpts{})
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assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, res)
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// UTF8 BOM + "áéíóú"
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res = ToUTF8DropErrors([]byte{0xef, 0xbb, 0xbf, 0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, ConvertOpts{})
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assert.Equal(t, []byte{0xc3, 0xa1, 0xc3, 0xa9, 0xc3, 0xad, 0xc3, 0xb3, 0xc3, 0xba}, res)
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// "Hola, así cómo ños"
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res = ToUTF8DropErrors([]byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63, 0xF3, 0x6D, 0x6F, 0x20, 0xF1, 0x6F, 0x73}, ConvertOpts{})
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assert.Equal(t, []byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73}, res[:8])
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assert.Equal(t, []byte{0x73}, res[len(res)-1:])
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// "Hola, así cómo "
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minmatch := []byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xC3, 0xAD, 0x20, 0x63, 0xC3, 0xB3, 0x6D, 0x6F, 0x20}
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res = ToUTF8DropErrors([]byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63, 0xF3, 0x6D, 0x6F, 0x20, 0x07, 0xA4, 0x6F, 0x73}, ConvertOpts{})
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// Do not fail for differences in invalid cases, as the library might change the conversion criteria for those
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assert.Equal(t, minmatch, res[0:len(minmatch)])
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res = ToUTF8DropErrors([]byte{0x48, 0x6F, 0x6C, 0x61, 0x2C, 0x20, 0x61, 0x73, 0xED, 0x20, 0x63, 0xF3, 0x6D, 0x6F, 0x20, 0x81, 0xA4, 0x6F, 0x73}, ConvertOpts{})
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// Do not fail for differences in invalid cases, as the library might change the conversion criteria for those
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assert.Equal(t, minmatch, res[0:len(minmatch)])
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// Japanese (Shift-JIS)
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// "日属秘ぞしちゅ。"
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res = ToUTF8DropErrors([]byte{0x93, 0xFA, 0x91, 0xAE, 0x94, 0xE9, 0x82, 0xBC, 0x82, 0xB5, 0x82, 0xBF, 0x82, 0xE3, 0x81, 0x42}, ConvertOpts{})
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assert.Equal(t, []byte{
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0xE6, 0x97, 0xA5, 0xE5, 0xB1, 0x9E, 0xE7, 0xA7, 0x98, 0xE3,
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0x81, 0x9E, 0xE3, 0x81, 0x97, 0xE3, 0x81, 0xA1, 0xE3, 0x82, 0x85, 0xE3, 0x80, 0x82,
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}, res)
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res = ToUTF8DropErrors([]byte{0x00, 0x00, 0x00, 0x00}, ConvertOpts{})
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assert.Equal(t, []byte{0x00, 0x00, 0x00, 0x00}, res)
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}
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func TestDetectEncoding(t *testing.T) {
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resetDefaultCharsetsOrder()
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testSuccess := func(b []byte, expected string) {
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encoding, err := DetectEncoding(b)
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assert.NoError(t, err)
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assert.Equal(t, expected, encoding)
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}
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// utf-8
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b := []byte("just some ascii")
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testSuccess(b, "UTF-8")
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// utf-8-sig: "hey" (with BOM)
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b = []byte{0xef, 0xbb, 0xbf, 0x68, 0x65, 0x79}
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testSuccess(b, "UTF-8")
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// utf-16: "hey<accented G>"
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b = []byte{0xff, 0xfe, 0x68, 0x00, 0x65, 0x00, 0x79, 0x00, 0xf4, 0x01}
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testSuccess(b, "UTF-16LE")
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// iso-8859-1: d<accented e>cor<newline>
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b = []byte{0x44, 0xe9, 0x63, 0x6f, 0x72, 0x0a}
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encoding, err := DetectEncoding(b)
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assert.NoError(t, err)
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assert.Contains(t, encoding, "ISO-8859-1")
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old := setting.Repository.AnsiCharset
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setting.Repository.AnsiCharset = "placeholder"
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defer func() {
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setting.Repository.AnsiCharset = old
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}()
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testSuccess(b, "placeholder")
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// invalid bytes
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b = []byte{0xfa}
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_, err = DetectEncoding(b)
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assert.Error(t, err)
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}
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func stringMustStartWith(t *testing.T, expected, value string) {
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assert.Equal(t, expected, value[:len(expected)])
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}
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func stringMustEndWith(t *testing.T, expected, value string) {
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assert.Equal(t, expected, value[len(value)-len(expected):])
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}
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func TestToUTF8WithFallbackReader(t *testing.T) {
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resetDefaultCharsetsOrder()
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for testLen := 0; testLen < 2048; testLen++ {
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pattern := " test { () }\n"
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input := ""
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for len(input) < testLen {
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input += pattern
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}
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input = input[:testLen]
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input += "// Выключаем"
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rd := ToUTF8WithFallbackReader(bytes.NewReader([]byte(input)), ConvertOpts{})
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r, _ := io.ReadAll(rd)
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assert.EqualValuesf(t, input, string(r), "testing string len=%d", testLen)
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}
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truncatedOneByteExtension := failFastBytes
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encoding, _ := DetectEncoding(truncatedOneByteExtension)
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assert.Equal(t, "UTF-8", encoding)
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truncatedTwoByteExtension := failFastBytes
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truncatedTwoByteExtension[len(failFastBytes)-1] = 0x9b
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truncatedTwoByteExtension[len(failFastBytes)-2] = 0xe2
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encoding, _ = DetectEncoding(truncatedTwoByteExtension)
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assert.Equal(t, "UTF-8", encoding)
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truncatedThreeByteExtension := failFastBytes
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truncatedThreeByteExtension[len(failFastBytes)-1] = 0x92
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truncatedThreeByteExtension[len(failFastBytes)-2] = 0x9f
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truncatedThreeByteExtension[len(failFastBytes)-3] = 0xf0
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encoding, _ = DetectEncoding(truncatedThreeByteExtension)
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assert.Equal(t, "UTF-8", encoding)
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}
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var failFastBytes = []byte{
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0x69, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x20, 0x6f, 0x72, 0x67, 0x2e, 0x61, 0x70, 0x61, 0x63, 0x68, 0x65, 0x2e, 0x74, 0x6f,
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0x6f, 0x6c, 0x73, 0x2e, 0x61, 0x6e, 0x74, 0x2e, 0x74, 0x61, 0x73, 0x6b, 0x64, 0x65, 0x66, 0x73, 0x2e, 0x63, 0x6f, 0x6e,
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0x64, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x2e, 0x4f, 0x73, 0x0a, 0x69, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x20, 0x6f, 0x72, 0x67,
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0x2e, 0x73, 0x70, 0x72, 0x69, 0x6e, 0x67, 0x66, 0x72, 0x61, 0x6d, 0x65, 0x77, 0x6f, 0x72, 0x6b, 0x2e, 0x62, 0x6f, 0x6f,
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0x74, 0x2e, 0x67, 0x72, 0x61, 0x64, 0x6c, 0x65, 0x2e, 0x74, 0x61, 0x73, 0x6b, 0x73, 0x2e, 0x72, 0x75, 0x6e, 0x2e, 0x42,
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0x6f, 0x6f, 0x74, 0x52, 0x75, 0x6e, 0x0a, 0x0a, 0x70, 0x6c, 0x75, 0x67, 0x69, 0x6e, 0x73, 0x20, 0x7b, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x69, 0x64, 0x28, 0x22, 0x6f, 0x72, 0x67, 0x2e, 0x73, 0x70, 0x72, 0x69, 0x6e, 0x67, 0x66, 0x72, 0x61, 0x6d,
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0x65, 0x77, 0x6f, 0x72, 0x6b, 0x2e, 0x62, 0x6f, 0x6f, 0x74, 0x22, 0x29, 0x0a, 0x7d, 0x0a, 0x0a, 0x64, 0x65, 0x70, 0x65,
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0x6e, 0x64, 0x65, 0x6e, 0x63, 0x69, 0x65, 0x73, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x69, 0x6d, 0x70, 0x6c, 0x65,
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0x6d, 0x65, 0x6e, 0x74, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x28, 0x70, 0x72, 0x6f, 0x6a, 0x65, 0x63, 0x74, 0x28, 0x22, 0x3a,
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0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x3a, 0x61, 0x70, 0x69, 0x22, 0x29, 0x29, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x69, 0x6d,
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0x70, 0x6c, 0x65, 0x6d, 0x65, 0x6e, 0x74, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x28, 0x70, 0x72, 0x6f, 0x6a, 0x65, 0x63, 0x74,
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