58 lines
2.0 KiB
Smalltalk
58 lines
2.0 KiB
Smalltalk
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(C) 2011 by Holger Hans Peter Freyther
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All Rights Reserved
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"
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String extend [
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asGSM7Bit [
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| bits rest bytes |
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"I convert a string into a 7bit encoded string. I should
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also be in UnicodeString but I am not. This impl. is just
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basic and does not deal with difficult bits."
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<category: '*-osmo-gsm'>
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bits := OrderedCollection new.
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"Split it into bits"
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self do: [:char | | val |
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val := char value.
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1 to: 7 do: [:digit | bits add: (val bitAt: digit)].
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].
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"Turn bits into bytes again..."
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rest := 8 - (bits size \\ 8).
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rest to: 1 by: -1 do: [:each | bits add: 0].
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bytes := ByteArray new: bits size / 8.
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1 to: bits size by: 8 do: [:each | | byte |
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byte := 0.
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byte := (byte bitShift: 1) bitOr: (bits at: each + 7).
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byte := (byte bitShift: 1) bitOr: (bits at: each + 6).
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byte := (byte bitShift: 1) bitOr: (bits at: each + 5).
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byte := (byte bitShift: 1) bitOr: (bits at: each + 4).
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byte := (byte bitShift: 1) bitOr: (bits at: each + 3).
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byte := (byte bitShift: 1) bitOr: (bits at: each + 2).
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byte := (byte bitShift: 1) bitOr: (bits at: each + 1).
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byte := (byte bitShift: 1) bitOr: (bits at: each + 0).
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bytes at: (each // 8) + 1 put: byte.
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].
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^ bytes
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]
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]
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