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Pallab Maiti
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May 18, 2023
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,18 @@ | ||
| // | ||
| // NSData+GZIP.h | ||
| // Rudder | ||
| // | ||
| // Created by Pallab Maiti on 17/05/23. | ||
| // | ||
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| #import <Foundation/Foundation.h> | ||
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| @interface NSData (GZIP) | ||
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| - (nullable NSData *)gzippedDataWithCompressionLevel:(float)level; | ||
| - (nullable NSData *)gzippedData; | ||
| - (nullable NSData *)gunzippedData; | ||
| - (BOOL)isGzippedData; | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| // | ||
| // NSData+GZIP.m | ||
| // Rudder | ||
| // | ||
| // Created by Pallab Maiti on 17/05/23. | ||
| // | ||
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| #import "NSData+GZIP.h" | ||
| #import <zlib.h> | ||
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| #pragma clang diagnostic ignored "-Wcast-qual" | ||
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| @implementation NSData (GZIP) | ||
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| - (NSData *)gzippedDataWithCompressionLevel:(float)level { | ||
| if (self.length == 0 || [self isGzippedData]) { | ||
| return self; | ||
| } | ||
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| z_stream stream; | ||
| stream.zalloc = Z_NULL; | ||
| stream.zfree = Z_NULL; | ||
| stream.opaque = Z_NULL; | ||
| stream.avail_in = (uint)self.length; | ||
| stream.next_in = (Bytef *)(void *)self.bytes; | ||
| stream.total_out = 0; | ||
| stream.avail_out = 0; | ||
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| static const NSUInteger ChunkSize = 16384; | ||
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| NSMutableData *output = nil; | ||
| int compression = (level < 0.0f)? Z_DEFAULT_COMPRESSION: (int)(roundf(level * 9)); | ||
| if (deflateInit2(&stream, compression, Z_DEFLATED, 31, 8, Z_DEFAULT_STRATEGY) == Z_OK) { | ||
| output = [NSMutableData dataWithLength:ChunkSize]; | ||
| while (stream.avail_out == 0) { | ||
| if (stream.total_out >= output.length) { | ||
| output.length += ChunkSize; | ||
| } | ||
| stream.next_out = (uint8_t *)output.mutableBytes + stream.total_out; | ||
| stream.avail_out = (uInt)(output.length - stream.total_out); | ||
| deflate(&stream, Z_FINISH); | ||
| } | ||
| deflateEnd(&stream); | ||
| output.length = stream.total_out; | ||
| } | ||
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| return output; | ||
| } | ||
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| - (NSData *)gzippedData { | ||
| return [self gzippedDataWithCompressionLevel:-1.0f]; | ||
| } | ||
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| - (NSData *)gunzippedData { | ||
| if (self.length == 0 || ![self isGzippedData]) { | ||
| return self; | ||
| } | ||
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| z_stream stream; | ||
| stream.zalloc = Z_NULL; | ||
| stream.zfree = Z_NULL; | ||
| stream.avail_in = (uint)self.length; | ||
| stream.next_in = (Bytef *)self.bytes; | ||
| stream.total_out = 0; | ||
| stream.avail_out = 0; | ||
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| NSMutableData *output = nil; | ||
| if (inflateInit2(&stream, 47) == Z_OK) { | ||
| int status = Z_OK; | ||
| output = [NSMutableData dataWithCapacity:self.length * 2]; | ||
| while (status == Z_OK) { | ||
| if (stream.total_out >= output.length) { | ||
| output.length += self.length / 2; | ||
| } | ||
| stream.next_out = (uint8_t *)output.mutableBytes + stream.total_out; | ||
| stream.avail_out = (uInt)(output.length - stream.total_out); | ||
| status = inflate (&stream, Z_SYNC_FLUSH); | ||
| } | ||
| if (inflateEnd(&stream) == Z_OK && status == Z_STREAM_END) { | ||
| output.length = stream.total_out; | ||
| } | ||
| } | ||
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| return output; | ||
| } | ||
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| - (BOOL)isGzippedData { | ||
| const UInt8 *bytes = (const UInt8 *)self.bytes; | ||
| return (self.length >= 2 && bytes[0] == 0x1f && bytes[1] == 0x8b); | ||
| } | ||
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| @end |
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