mirror of
https://github.com/unidoc/unipdf.git
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96 lines
2.7 KiB
Go
96 lines
2.7 KiB
Go
/*
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* This file is subject to the terms and conditions defined in
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* file 'LICENSE.md', which is part of this source code package.
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*/
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package contentstream
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import (
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"errors"
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"github.com/unidoc/unipdf/v3/common"
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"github.com/unidoc/unipdf/v3/core"
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"github.com/unidoc/unipdf/v3/model"
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)
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func makeParamsFromFloats(vals []float64) []core.PdfObject {
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var params []core.PdfObject
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for _, val := range vals {
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params = append(params, core.MakeFloat(val))
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}
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return params
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}
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func makeParamsFromNames(vals []core.PdfObjectName) []core.PdfObject {
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var params []core.PdfObject
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for _, val := range vals {
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params = append(params, core.MakeName(string(val)))
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}
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return params
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}
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func makeParamsFromStrings(vals []core.PdfObjectString) []core.PdfObject {
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var params []core.PdfObject
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for _, val := range vals {
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params = append(params, core.MakeString(val.Str()))
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}
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return params
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}
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func makeParamsFromInts(vals []int64) []core.PdfObject {
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var params []core.PdfObject
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for _, val := range vals {
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params = append(params, core.MakeInteger(val))
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}
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return params
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}
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func newIndexedColorspaceFromPdfObject(obj core.PdfObject) (model.PdfColorspace, error) {
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arr, ok := obj.(*core.PdfObjectArray)
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if !ok {
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common.Log.Debug("Error: Invalid indexed cs not in array (%#v)", obj)
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return nil, errors.New("type check error")
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}
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if arr.Len() != 4 {
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common.Log.Debug("Error: Invalid cs array, length != 4 (%d)", arr.Len())
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return nil, errors.New("range check error")
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}
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// Format is [/I base 255 bytes], where base = /G,/RGB,/CMYK
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name, ok := arr.Get(0).(*core.PdfObjectName)
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if !ok {
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common.Log.Debug("Error: Invalid cs array first element not a name (array: %#v)", *arr)
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return nil, errors.New("type check error")
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}
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if *name != "I" && *name != "Indexed" {
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common.Log.Debug("Error: Invalid cs array first element != I (got: %v)", *name)
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return nil, errors.New("range check error")
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}
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// Check base
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name, ok = arr.Get(1).(*core.PdfObjectName)
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if !ok {
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common.Log.Debug("Error: Invalid cs array 2nd element not a name (array: %#v)", *arr)
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return nil, errors.New("type check error")
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}
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if *name != "G" && *name != "RGB" && *name != "CMYK" && *name != "DeviceGray" && *name != "DeviceRGB" && *name != "DeviceCMYK" {
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common.Log.Debug("Error: Invalid cs array 2nd element != G/RGB/CMYK (got: %v)", *name)
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return nil, errors.New("range check error")
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}
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basename := ""
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switch *name {
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case "G", "DeviceGray":
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basename = "DeviceGray"
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case "RGB", "DeviceRGB":
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basename = "DeviceRGB"
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case "CMYK", "DeviceCMYK":
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basename = "DeviceCMYK"
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}
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// Prepare to a format that can be loaded by model's newPdfColorspaceFromPdfObject.
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csArr := core.MakeArray(core.MakeName("Indexed"), core.MakeName(basename), arr.Get(2), arr.Get(3))
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return model.NewPdfColorspaceFromPdfObject(csArr)
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}
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