--- /dev/null
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+
+
+
+/* *************************************
+* Dependencies
+***************************************/
+#define ZBUFF_STATIC_LINKING_ONLY
+#include "zbuff.h"
+#include "../common/error_private.h"
+
+
+/*-***********************************************************
+* Streaming compression
+*
+* A ZBUFF_CCtx object is required to track streaming operation.
+* Use ZBUFF_createCCtx() and ZBUFF_freeCCtx() to create/release resources.
+* Use ZBUFF_compressInit() to start a new compression operation.
+* ZBUFF_CCtx objects can be reused multiple times.
+*
+* Use ZBUFF_compressContinue() repetitively to consume your input.
+* *srcSizePtr and *dstCapacityPtr can be any size.
+* The function will report how many bytes were read or written by modifying *srcSizePtr and *dstCapacityPtr.
+* Note that it may not consume the entire input, in which case it's up to the caller to call again the function with remaining input.
+* The content of dst will be overwritten (up to *dstCapacityPtr) at each function call, so save its content if it matters or change dst .
+* @return : a hint to preferred nb of bytes to use as input for next function call (it's only a hint, to improve latency)
+* or an error code, which can be tested using ZBUFF_isError().
+*
+* ZBUFF_compressFlush() can be used to instruct ZBUFF to compress and output whatever remains within its buffer.
+* Note that it will not output more than *dstCapacityPtr.
+* Therefore, some content might still be left into its internal buffer if dst buffer is too small.
+* @return : nb of bytes still present into internal buffer (0 if it's empty)
+* or an error code, which can be tested using ZBUFF_isError().
+*
+* ZBUFF_compressEnd() instructs to finish a frame.
+* It will perform a flush and write frame epilogue.
+* Similar to ZBUFF_compressFlush(), it may not be able to output the entire internal buffer content if *dstCapacityPtr is too small.
+* @return : nb of bytes still present into internal buffer (0 if it's empty)
+* or an error code, which can be tested using ZBUFF_isError().
+*
+* Hint : recommended buffer sizes (not compulsory)
+* input : ZSTD_BLOCKSIZE_MAX (128 KB), internal unit size, it improves latency to use this value.
+* output : ZSTD_compressBound(ZSTD_BLOCKSIZE_MAX) + ZSTD_blockHeaderSize + ZBUFF_endFrameSize : ensures it's always possible to write/flush/end a full block at best speed.
+* ***********************************************************/
+
+ZBUFF_CCtx* ZBUFF_createCCtx(void)
+{
+ return ZSTD_createCStream();
+}
+
+ZBUFF_CCtx* ZBUFF_createCCtx_advanced(ZSTD_customMem customMem)
+{
+ return ZSTD_createCStream_advanced(customMem);
+}
+
+size_t ZBUFF_freeCCtx(ZBUFF_CCtx* zbc)
+{
+ return ZSTD_freeCStream(zbc);
+}
+
+
+/* ====== Initialization ====== */
+
+size_t ZBUFF_compressInit_advanced(ZBUFF_CCtx* zbc,
+ const void* dict, size_t dictSize,
+ ZSTD_parameters params, unsigned long long pledgedSrcSize)
+{
+ if (pledgedSrcSize==0) pledgedSrcSize = ZSTD_CONTENTSIZE_UNKNOWN; /* preserve "0 == unknown" behavior */
+ FORWARD_IF_ERROR(ZSTD_CCtx_reset(zbc, ZSTD_reset_session_only), "");
+ FORWARD_IF_ERROR(ZSTD_CCtx_setPledgedSrcSize(zbc, pledgedSrcSize), "");
+
+ FORWARD_IF_ERROR(ZSTD_checkCParams(params.cParams), "");
+ FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(zbc, ZSTD_c_windowLog, params.cParams.windowLog), "");
+ FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(zbc, ZSTD_c_hashLog, params.cParams.hashLog), "");
+ FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(zbc, ZSTD_c_chainLog, params.cParams.chainLog), "");
+ FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(zbc, ZSTD_c_searchLog, params.cParams.searchLog), "");
+ FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(zbc, ZSTD_c_minMatch, params.cParams.minMatch), "");
+ FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(zbc, ZSTD_c_targetLength, params.cParams.targetLength), "");
+ FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(zbc, ZSTD_c_strategy, params.cParams.strategy), "");
+
+ FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(zbc, ZSTD_c_contentSizeFlag, params.fParams.contentSizeFlag), "");
+ FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(zbc, ZSTD_c_checksumFlag, params.fParams.checksumFlag), "");
+ FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(zbc, ZSTD_c_dictIDFlag, params.fParams.noDictIDFlag), "");
+
+ FORWARD_IF_ERROR(ZSTD_CCtx_loadDictionary(zbc, dict, dictSize), "");
+ return 0;
+}
+
+size_t ZBUFF_compressInitDictionary(ZBUFF_CCtx* zbc, const void* dict, size_t dictSize, int compressionLevel)
+{
+ FORWARD_IF_ERROR(ZSTD_CCtx_reset(zbc, ZSTD_reset_session_only), "");
+ FORWARD_IF_ERROR(ZSTD_CCtx_setParameter(zbc, ZSTD_c_compressionLevel, compressionLevel), "");
+ FORWARD_IF_ERROR(ZSTD_CCtx_loadDictionary(zbc, dict, dictSize), "");
+ return 0;
+}
+
+size_t ZBUFF_compressInit(ZBUFF_CCtx* zbc, int compressionLevel)
+{
+ return ZSTD_initCStream(zbc, compressionLevel);
+}
+
+/* ====== Compression ====== */
+
+
+size_t ZBUFF_compressContinue(ZBUFF_CCtx* zbc,
+ void* dst, size_t* dstCapacityPtr,
+ const void* src, size_t* srcSizePtr)
+{
+ size_t result;
+ ZSTD_outBuffer outBuff;
+ ZSTD_inBuffer inBuff;
+ outBuff.dst = dst;
+ outBuff.pos = 0;
+ outBuff.size = *dstCapacityPtr;
+ inBuff.src = src;
+ inBuff.pos = 0;
+ inBuff.size = *srcSizePtr;
+ result = ZSTD_compressStream(zbc, &outBuff, &inBuff);
+ *dstCapacityPtr = outBuff.pos;
+ *srcSizePtr = inBuff.pos;
+ return result;
+}
+
+
+
+/* ====== Finalize ====== */
+
+size_t ZBUFF_compressFlush(ZBUFF_CCtx* zbc, void* dst, size_t* dstCapacityPtr)
+{
+ size_t result;
+ ZSTD_outBuffer outBuff;
+ outBuff.dst = dst;
+ outBuff.pos = 0;
+ outBuff.size = *dstCapacityPtr;
+ result = ZSTD_flushStream(zbc, &outBuff);
+ *dstCapacityPtr = outBuff.pos;
+ return result;
+}
+
+
+size_t ZBUFF_compressEnd(ZBUFF_CCtx* zbc, void* dst, size_t* dstCapacityPtr)
+{
+ size_t result;
+ ZSTD_outBuffer outBuff;
+ outBuff.dst = dst;
+ outBuff.pos = 0;
+ outBuff.size = *dstCapacityPtr;
+ result = ZSTD_endStream(zbc, &outBuff);
+ *dstCapacityPtr = outBuff.pos;
+ return result;
+}
+
+
+
+/* *************************************
+* Tool functions
+***************************************/
+size_t ZBUFF_recommendedCInSize(void) { return ZSTD_CStreamInSize(); }
+size_t ZBUFF_recommendedCOutSize(void) { return ZSTD_CStreamOutSize(); }
notaz.gp2x.de / pcsx_rearmed.git / blobdiff