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60 lines
1.7 KiB
60 lines
1.7 KiB
package qr
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type block struct {
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data []byte
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ecc []byte
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}
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type blockList []*block
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func splitToBlocks(data <-chan byte, vi *versionInfo) blockList {
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result := make(blockList, vi.NumberOfBlocksInGroup1+vi.NumberOfBlocksInGroup2)
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for b := 0; b < int(vi.NumberOfBlocksInGroup1); b++ {
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blk := new(block)
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blk.data = make([]byte, vi.DataCodeWordsPerBlockInGroup1)
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for cw := 0; cw < int(vi.DataCodeWordsPerBlockInGroup1); cw++ {
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blk.data[cw] = <-data
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}
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blk.ecc = ec.calcECC(blk.data, vi.ErrorCorrectionCodewordsPerBlock)
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result[b] = blk
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}
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for b := 0; b < int(vi.NumberOfBlocksInGroup2); b++ {
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blk := new(block)
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blk.data = make([]byte, vi.DataCodeWordsPerBlockInGroup2)
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for cw := 0; cw < int(vi.DataCodeWordsPerBlockInGroup2); cw++ {
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blk.data[cw] = <-data
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}
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blk.ecc = ec.calcECC(blk.data, vi.ErrorCorrectionCodewordsPerBlock)
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result[int(vi.NumberOfBlocksInGroup1)+b] = blk
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}
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return result
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}
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func (bl blockList) interleave(vi *versionInfo) []byte {
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var maxCodewordCount int
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if vi.DataCodeWordsPerBlockInGroup1 > vi.DataCodeWordsPerBlockInGroup2 {
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maxCodewordCount = int(vi.DataCodeWordsPerBlockInGroup1)
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} else {
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maxCodewordCount = int(vi.DataCodeWordsPerBlockInGroup2)
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}
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resultLen := (vi.DataCodeWordsPerBlockInGroup1+vi.ErrorCorrectionCodewordsPerBlock)*vi.NumberOfBlocksInGroup1 +
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(vi.DataCodeWordsPerBlockInGroup2+vi.ErrorCorrectionCodewordsPerBlock)*vi.NumberOfBlocksInGroup2
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result := make([]byte, 0, resultLen)
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for i := 0; i < maxCodewordCount; i++ {
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for b := 0; b < len(bl); b++ {
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if len(bl[b].data) > i {
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result = append(result, bl[b].data[i])
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}
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}
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}
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for i := 0; i < int(vi.ErrorCorrectionCodewordsPerBlock); i++ {
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for b := 0; b < len(bl); b++ {
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result = append(result, bl[b].ecc[i])
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}
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}
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return result
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}
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