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GzipNoCompression witout zlib calls

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orignal 2020-05-02 21:18:44 -04:00
parent e301387896
commit 1eead0e885
3 changed files with 25 additions and 7 deletions
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15
libi2pd/Gzip.cpp
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@ -10,6 +10,7 @@
#include <string.h> /* memset */
#include <iostream>
#include "Log.h"
#include "I2PEndian.h"
#include "Gzip.h"
namespace i2p
@ -111,5 +112,19 @@ namespace data
LogPrint (eLogError, "Gzip: Deflate error ", err);
return 0;
}
size_t GzipNoCompression (const uint8_t * in, uint16_t inLen, uint8_t * out, size_t outLen)
{
static const uint8_t gzipHeader[11] = { 0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x03, 0x01 };
if (outLen < (size_t)inLen + 23) return 0;
memcpy (out, gzipHeader, 11);
htole16buf (out + 11, inLen);
htole16buf (out + 13, 0xffff - inLen);
memcpy (out + 15, in, inLen);
htole32buf (out + inLen + 15, crc32 (0, in, inLen));
htole32buf (out + inLen + 19, inLen);
return inLen + 23;
}
} // data
} // i2p