Tryanks/pdfsign
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Append instead of replace

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This commit is contained in:
Jeroen Bobbeldijk
2017-07-08 14:55:31 +02:00
parent 6d38be3f51
commit db69b6a4c0
9 changed files with 127 additions and 26 deletions
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7
sign/pdfbyterange.go
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@@ -10,8 +10,7 @@ func (context *SignContext) updateByteRange() error {
// @todo: find out of this is safe.
output_file_stat, _ := context.OutputFile.Stat()
// Don't count last newline as file length.
output_file_size := output_file_stat.Size() - 1
output_file_size := output_file_stat.Size()
// Calculate ByteRange values to replace them.
context.ByteRangeValues = make([]int64, 4)
@@ -20,10 +19,10 @@ func (context *SignContext) updateByteRange() error {
context.ByteRangeValues[0] = int64(0)
// Signature ByteRange part 1 length always stops at the actual signature start byte.
context.ByteRangeValues[1] = context.SignatureContentsStartByte
context.ByteRangeValues[1] = context.SignatureContentsStartByte - 1
// Signature ByteRange part 2 start byte directly starts after the actual signature.
context.ByteRangeValues[2] = context.ByteRangeValues[1] + int64(signatureMaxLength)
context.ByteRangeValues[2] = context.ByteRangeValues[1] + 1 + int64(signatureMaxLength) + 1
// Signature ByteRange part 2 length is everything else of the file.
context.ByteRangeValues[3] = output_file_size - context.ByteRangeValues[2]