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Unified Diff: sdk/lib/io/data_transformer.dart

Issue 2754013002: Format all dart: library files (Closed)
Patch Set: Format all dart: library files Created 3 years, 9 months ago
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Index: sdk/lib/io/data_transformer.dart
diff --git a/sdk/lib/io/data_transformer.dart b/sdk/lib/io/data_transformer.dart
index d908e6744299cf2301e725854f88f924dd3b6ddd..0c922366576ff475820d86550844d04abb9df84c 100644
--- a/sdk/lib/io/data_transformer.dart
+++ b/sdk/lib/io/data_transformer.dart
@@ -13,9 +13,11 @@ abstract class ZLibOption {
/// Minimal value for [ZLibCodec.windowBits], [ZLibEncoder.windowBits]
/// and [ZLibDecoder.windowBits].
static const int MIN_WINDOW_BITS = 8;
+
/// Maximal value for [ZLibCodec.windowBits], [ZLibEncoder.windowBits]
/// and [ZLibDecoder.windowBits].
static const int MAX_WINDOW_BITS = 15;
+
/// Default value for [ZLibCodec.windowBits], [ZLibEncoder.windowBits]
/// and [ZLibDecoder.windowBits].
static const int DEFAULT_WINDOW_BITS = 15;
@@ -23,9 +25,11 @@ abstract class ZLibOption {
/// Minimal value for [ZLibCodec.level], [ZLibEncoder.level]
/// and [ZLibDecoder.level].
static const int MIN_LEVEL = -1;
+
/// Maximal value for [ZLibCodec.level], [ZLibEncoder.level]
/// and [ZLibDecoder.level].
static const int MAX_LEVEL = 9;
+
/// Default value for [ZLibCodec.level], [ZLibEncoder.level]
/// and [ZLibDecoder.level].
static const int DEFAULT_LEVEL = 6;
@@ -33,23 +37,28 @@ abstract class ZLibOption {
/// Minimal value for [ZLibCodec.memLevel], [ZLibEncoder.memLevel]
/// and [ZLibDecoder.memLevel].
static const int MIN_MEM_LEVEL = 1;
+
/// Maximal value for [ZLibCodec.memLevel], [ZLibEncoder.memLevel]
/// and [ZLibDecoder.memLevel].
static const int MAX_MEM_LEVEL = 9;
+
/// Default value for [ZLibCodec.memLevel], [ZLibEncoder.memLevel]
/// and [ZLibDecoder.memLevel].
static const int DEFAULT_MEM_LEVEL = 8;
-
/// Recommended strategy for data produced by a filter (or predictor)
static const int STRATEGY_FILTERED = 1;
+
/// Use this strategy to force Huffman encoding only (no string match)
static const int STRATEGY_HUFFMAN_ONLY = 2;
+
/// Use this strategy to limit match distances to one (run-length encoding)
static const int STRATEGY_RLE = 3;
+
/// This strategy prevents the use of dynamic Huffman codes, allowing for a
/// simpler decoder
static const int STRATEGY_FIXED = 4;
+
/// Recommended strategy for normal data
static const int STRATEGY_DEFAULT = 0;
}
@@ -122,13 +131,14 @@ class ZLibCodec extends Codec<List<int>, List<int>> {
*/
final List<int> dictionary;
- ZLibCodec({this.level: ZLibOption.DEFAULT_LEVEL,
- this.windowBits: ZLibOption.DEFAULT_WINDOW_BITS,
- this.memLevel: ZLibOption.DEFAULT_MEM_LEVEL,
- this.strategy: ZLibOption.STRATEGY_DEFAULT,
- this.dictionary: null,
- this.raw: false,
- this.gzip: false}) {
+ ZLibCodec(
+ {this.level: ZLibOption.DEFAULT_LEVEL,
+ this.windowBits: ZLibOption.DEFAULT_WINDOW_BITS,
+ this.memLevel: ZLibOption.DEFAULT_MEM_LEVEL,
+ this.strategy: ZLibOption.STRATEGY_DEFAULT,
+ this.dictionary: null,
+ this.raw: false,
+ this.gzip: false}) {
_validateZLibeLevel(level);
_validateZLibMemLevel(memLevel);
_validateZLibStrategy(strategy);
@@ -147,10 +157,14 @@ class ZLibCodec extends Codec<List<int>, List<int>> {
/**
* Get a [ZLibEncoder] for encoding to `ZLib` compressed data.
*/
- ZLibEncoder get encoder =>
- new ZLibEncoder(gzip: false, level: level, windowBits: windowBits,
- memLevel: memLevel, strategy: strategy,
- dictionary: dictionary, raw: raw);
+ ZLibEncoder get encoder => new ZLibEncoder(
+ gzip: false,
+ level: level,
+ windowBits: windowBits,
+ memLevel: memLevel,
+ strategy: strategy,
+ dictionary: dictionary,
+ raw: raw);
/**
* Get a [ZLibDecoder] for decoding `ZLib` compressed data.
@@ -159,13 +173,11 @@ class ZLibCodec extends Codec<List<int>, List<int>> {
new ZLibDecoder(windowBits: windowBits, dictionary: dictionary, raw: raw);
}
-
/**
* An instance of the default implementation of the [GZipCodec].
*/
const GZipCodec GZIP = const GZipCodec._default();
-
/**
* The [GZipCodec] encodes raw bytes to GZip compressed bytes and decodes GZip
* compressed bytes to raw bytes.
@@ -234,13 +246,14 @@ class GZipCodec extends Codec<List<int>, List<int>> {
*/
final bool raw;
- GZipCodec({this.level: ZLibOption.DEFAULT_LEVEL,
- this.windowBits: ZLibOption.DEFAULT_WINDOW_BITS,
- this.memLevel: ZLibOption.DEFAULT_MEM_LEVEL,
- this.strategy: ZLibOption.STRATEGY_DEFAULT,
- this.dictionary: null,
- this.raw: false,
- this.gzip: true}) {
+ GZipCodec(
+ {this.level: ZLibOption.DEFAULT_LEVEL,
+ this.windowBits: ZLibOption.DEFAULT_WINDOW_BITS,
+ this.memLevel: ZLibOption.DEFAULT_MEM_LEVEL,
+ this.strategy: ZLibOption.STRATEGY_DEFAULT,
+ this.dictionary: null,
+ this.raw: false,
+ this.gzip: true}) {
_validateZLibeLevel(level);
_validateZLibMemLevel(memLevel);
_validateZLibStrategy(strategy);
@@ -259,10 +272,14 @@ class GZipCodec extends Codec<List<int>, List<int>> {
/**
* Get a [ZLibEncoder] for encoding to `GZip` compressed data.
*/
- ZLibEncoder get encoder =>
- new ZLibEncoder(gzip: true, level: level, windowBits: windowBits,
- memLevel: memLevel, strategy: strategy,
- dictionary: dictionary, raw: raw);
+ ZLibEncoder get encoder => new ZLibEncoder(
+ gzip: true,
+ level: level,
+ windowBits: windowBits,
+ memLevel: memLevel,
+ strategy: strategy,
+ dictionary: dictionary,
+ raw: raw);
/**
* Get a [ZLibDecoder] for decoding `GZip` compressed data.
@@ -277,7 +294,6 @@ class GZipCodec extends Codec<List<int>, List<int>> {
*/
class ZLibEncoder extends Converter<List<int>, List<int>>
implements ChunkedConverter<List<int>, List<int>, List<int>, List<int>> {
-
/**
* When true, `GZip` frames will be added to the compressed data.
*/
@@ -332,20 +348,20 @@ class ZLibEncoder extends Converter<List<int>, List<int>>
*/
final List<int> dictionary;
-
/**
* When true, deflate generates raw data with no zlib header or trailer, and
* will not compute an adler32 check value
*/
final bool raw;
- ZLibEncoder({this.gzip: false,
- this.level: ZLibOption.DEFAULT_LEVEL,
- this.windowBits: ZLibOption.DEFAULT_WINDOW_BITS,
- this.memLevel: ZLibOption.DEFAULT_MEM_LEVEL,
- this.strategy: ZLibOption.STRATEGY_DEFAULT,
- this.dictionary: null,
- this.raw: false}) {
+ ZLibEncoder(
+ {this.gzip: false,
+ this.level: ZLibOption.DEFAULT_LEVEL,
+ this.windowBits: ZLibOption.DEFAULT_WINDOW_BITS,
+ this.memLevel: ZLibOption.DEFAULT_MEM_LEVEL,
+ this.strategy: ZLibOption.STRATEGY_DEFAULT,
+ this.dictionary: null,
+ this.raw: false}) {
_validateZLibeLevel(level);
_validateZLibMemLevel(memLevel);
_validateZLibStrategy(strategy);
@@ -358,7 +374,9 @@ class ZLibEncoder extends Converter<List<int>, List<int>>
*/
List<int> convert(List<int> bytes) {
_BufferSink sink = new _BufferSink();
- startChunkedConversion(sink)..add(bytes)..close();
+ startChunkedConversion(sink)
+ ..add(bytes)
+ ..close();
return sink.builder.takeBytes();
}
@@ -371,16 +389,15 @@ class ZLibEncoder extends Converter<List<int>, List<int>>
if (sink is! ByteConversionSink) {
sink = new ByteConversionSink.from(sink);
}
- return new _ZLibEncoderSink(sink, gzip, level, windowBits, memLevel,
- strategy, dictionary, raw);
+ return new _ZLibEncoderSink(
+ sink, gzip, level, windowBits, memLevel, strategy, dictionary, raw);
}
}
-
/**
* The [ZLibDecoder] is used by [ZLibCodec] and [GZipCodec] to decompress data.
*/
-class ZLibDecoder extends Converter<List<int>, List<int>> {
+class ZLibDecoder extends Converter<List<int>, List<int>> {
/**
* Base two logarithm of the window size (the size of the history buffer). It
* should be in the range `8..15`. Larger values result in better compression
@@ -406,8 +423,10 @@ class ZLibDecoder extends Converter<List<int>, List<int>> {
*/
final bool raw;
- ZLibDecoder({this.windowBits: ZLibOption.DEFAULT_WINDOW_BITS,
- this.dictionary: null, this.raw: false}) {
+ ZLibDecoder(
+ {this.windowBits: ZLibOption.DEFAULT_WINDOW_BITS,
+ this.dictionary: null,
+ this.raw: false}) {
_validateZLibWindowBits(windowBits);
}
@@ -417,7 +436,9 @@ class ZLibDecoder extends Converter<List<int>, List<int>> {
*/
List<int> convert(List<int> bytes) {
_BufferSink sink = new _BufferSink();
- startChunkedConversion(sink)..add(bytes)..close();
+ startChunkedConversion(sink)
+ ..add(bytes)
+ ..close();
return sink.builder.takeBytes();
}
@@ -434,7 +455,6 @@ class ZLibDecoder extends Converter<List<int>, List<int>> {
}
}
-
class _BufferSink extends ByteConversionSink {
final BytesBuilder builder = new BytesBuilder(copy: false);
@@ -454,23 +474,28 @@ class _BufferSink extends ByteConversionSink {
void close() {}
}
-
class _ZLibEncoderSink extends _FilterSink {
- _ZLibEncoderSink(ByteConversionSink sink, bool gzip, int level,
- int windowBits, int memLevel, int strategy,
- List<int> dictionary, bool raw)
- : super(sink, _Filter._newZLibDeflateFilter(gzip, level, windowBits,
- memLevel, strategy,
- dictionary, raw));
+ _ZLibEncoderSink(
+ ByteConversionSink sink,
+ bool gzip,
+ int level,
+ int windowBits,
+ int memLevel,
+ int strategy,
+ List<int> dictionary,
+ bool raw)
+ : super(
+ sink,
+ _Filter._newZLibDeflateFilter(
+ gzip, level, windowBits, memLevel, strategy, dictionary, raw));
}
class _ZLibDecoderSink extends _FilterSink {
- _ZLibDecoderSink(ByteConversionSink sink, int windowBits,
- List<int> dictionary, bool raw)
+ _ZLibDecoderSink(
+ ByteConversionSink sink, int windowBits, List<int> dictionary, bool raw)
: super(sink, _Filter._newZLibInflateFilter(windowBits, dictionary, raw));
}
-
class _FilterSink extends ByteConversionSink {
final _Filter _filter;
final ByteConversionSink _sink;
@@ -491,9 +516,8 @@ class _FilterSink extends ByteConversionSink {
_empty = false;
_BufferAndStart bufferAndStart =
_ensureFastAndSerializableByteData(data, start, end);
- _filter.process(bufferAndStart.buffer,
- bufferAndStart.start,
- end - (start - bufferAndStart.start));
+ _filter.process(bufferAndStart.buffer, bufferAndStart.start,
+ end - (start - bufferAndStart.start));
List<int> out;
while ((out = _filter.processed(flush: false)) != null) {
_sink.add(out);
@@ -525,7 +549,6 @@ class _FilterSink extends ByteConversionSink {
}
}
-
/**
* Private helper-class to handle native filters.
*/
@@ -546,43 +569,50 @@ abstract class _Filter {
*/
List<int> processed({bool flush: true, bool end: false});
- external static _Filter _newZLibDeflateFilter(bool gzip, int level,
- int windowBits, int memLevel,
- int strategy,
- List<int> dictionary, bool raw);
-
- external static _Filter _newZLibInflateFilter(int windowBits,
- List<int> dictionary, bool raw);
+ external static _Filter _newZLibDeflateFilter(
+ bool gzip,
+ int level,
+ int windowBits,
+ int memLevel,
+ int strategy,
+ List<int> dictionary,
+ bool raw);
+
+ external static _Filter _newZLibInflateFilter(
+ int windowBits, List<int> dictionary, bool raw);
}
void _validateZLibWindowBits(int windowBits) {
if (ZLibOption.MIN_WINDOW_BITS > windowBits ||
ZLibOption.MAX_WINDOW_BITS < windowBits) {
- throw new RangeError.range(windowBits, ZLibOption.MIN_WINDOW_BITS,
- ZLibOption.MAX_WINDOW_BITS);
+ throw new RangeError.range(
+ windowBits, ZLibOption.MIN_WINDOW_BITS, ZLibOption.MAX_WINDOW_BITS);
}
}
void _validateZLibeLevel(int level) {
- if (ZLibOption.MIN_LEVEL > level ||
- ZLibOption.MAX_LEVEL < level) {
- throw new RangeError.range(level, ZLibOption.MIN_LEVEL,
- ZLibOption.MAX_LEVEL);
+ if (ZLibOption.MIN_LEVEL > level || ZLibOption.MAX_LEVEL < level) {
+ throw new RangeError.range(
+ level, ZLibOption.MIN_LEVEL, ZLibOption.MAX_LEVEL);
}
}
void _validateZLibMemLevel(int memLevel) {
if (ZLibOption.MIN_MEM_LEVEL > memLevel ||
ZLibOption.MAX_MEM_LEVEL < memLevel) {
- throw new RangeError.range(memLevel, ZLibOption.MIN_MEM_LEVEL,
- ZLibOption.MAX_MEM_LEVEL);
+ throw new RangeError.range(
+ memLevel, ZLibOption.MIN_MEM_LEVEL, ZLibOption.MAX_MEM_LEVEL);
}
}
void _validateZLibStrategy(int strategy) {
- const strategies = const <int>[ZLibOption.STRATEGY_FILTERED,
- ZLibOption.STRATEGY_HUFFMAN_ONLY, ZLibOption.STRATEGY_RLE,
- ZLibOption.STRATEGY_FIXED, ZLibOption.STRATEGY_DEFAULT];
+ const strategies = const <int>[
+ ZLibOption.STRATEGY_FILTERED,
+ ZLibOption.STRATEGY_HUFFMAN_ONLY,
+ ZLibOption.STRATEGY_RLE,
+ ZLibOption.STRATEGY_FIXED,
+ ZLibOption.STRATEGY_DEFAULT
+ ];
if (strategies.indexOf(strategy) == -1) {
throw new ArgumentError("Unsupported 'strategy'");
}
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