72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
#include "StarZSTDCompression.hpp"
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#include <zstd.h>
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namespace Star {
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CompressionStream::CompressionStream() : m_cStream(ZSTD_createCStream()) {
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ZSTD_CCtx_setParameter(m_cStream, ZSTD_c_enableLongDistanceMatching, 1);
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ZSTD_CCtx_setParameter(m_cStream, ZSTD_c_windowLog, 24);
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ZSTD_initCStream(m_cStream, 2);
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m_output.resize(ZSTD_CStreamOutSize());
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}
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CompressionStream::~CompressionStream() { ZSTD_freeCStream(m_cStream); }
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ByteArray CompressionStream::compress(const char* in, size_t inLen) {
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size_t const cOutSize = ZSTD_CStreamOutSize();
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ZSTD_inBuffer inBuffer = {in, inLen, 0};
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size_t written = 0;
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bool finished = false;
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do {
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ZSTD_outBuffer outBuffer = {m_output.ptr() + written, min(cOutSize, m_output.size() - written), 0};
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size_t ret = ZSTD_compressStream2(m_cStream, &outBuffer, &inBuffer, ZSTD_e_flush);
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if (ZSTD_isError(ret)) {
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throw IOException(strf("ZSTD compression error {}", ZSTD_getErrorName(ret)));
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break;
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}
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written += outBuffer.pos;
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if (outBuffer.pos == outBuffer.size) {
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if (written >= m_output.size())
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m_output.resize(m_output.size() * 2);
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continue;
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}
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finished = ret == 0 && inBuffer.pos == inBuffer.size;
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} while (!finished);
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return ByteArray(m_output.ptr(), written);
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}
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DecompressionStream::DecompressionStream() : m_dStream(ZSTD_createDStream()) {
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ZSTD_DCtx_setParameter(m_dStream, ZSTD_d_windowLogMax, 25);
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ZSTD_initDStream(m_dStream);
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m_output.resize(ZSTD_DStreamOutSize());
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}
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DecompressionStream::~DecompressionStream() { ZSTD_freeDStream(m_dStream); }
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ByteArray DecompressionStream::decompress(const char* in, size_t inLen) {
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size_t const dOutSize = ZSTD_DStreamOutSize();
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ZSTD_inBuffer inBuffer = {in, inLen, 0};
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size_t written = 0;
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bool finished = false;
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do {
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ZSTD_outBuffer outBuffer = {m_output.ptr() + written, min(dOutSize, m_output.size() - written), 0};
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size_t ret = ZSTD_decompressStream(m_dStream, &outBuffer, &inBuffer);
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if (ZSTD_isError(ret)) {
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throw IOException(strf("ZSTD decompression error {}", ZSTD_getErrorName(ret)));
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break;
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}
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written += outBuffer.pos;
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if (outBuffer.pos == outBuffer.size) {
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if (written >= m_output.size())
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m_output.resize(m_output.size() * 2);
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continue;
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}
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finished = inBuffer.pos == inBuffer.size;
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} while (!finished);
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return ByteArray(m_output.ptr(), written);
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}
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} |