mirror of
https://github.com/emmanuel-marty/lzsa.git
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102 lines
3.4 KiB
C
102 lines
3.4 KiB
C
/*
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* dictionary.c - dictionary implementation
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*
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* Copyright (C) 2019 Emmanuel Marty
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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/*
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* Uses the libdivsufsort library Copyright (c) 2003-2008 Yuta Mori
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*
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* Inspired by LZ4 by Yann Collet. https://github.com/lz4/lz4
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* With help, ideas, optimizations and speed measurements by spke <zxintrospec@gmail.com>
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* With ideas from Lizard by Przemyslaw Skibinski and Yann Collet. https://github.com/inikep/lizard
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* Also with ideas from smallz4 by Stephan Brumme. https://create.stephan-brumme.com/smallz4/
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "format.h"
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#include "lib.h"
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/**
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* Load dictionary contents
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*
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* @param pszDictionaryFilename name of dictionary file, or NULL for none
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* @param ppDictionaryData pointer to returned dictionary contents, or NULL for none
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* @param pDictionaryDataSize pointer to returned size of dictionary contents, or 0
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*
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* @return LZSA_OK for success, or an error value from lzsa_status_t
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*/
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int lzsa_dictionary_load(const char *pszDictionaryFilename, void **ppDictionaryData, int *pDictionaryDataSize) {
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unsigned char *pDictionaryData = NULL;
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int nDictionaryDataSize = 0;
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if (pszDictionaryFilename) {
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pDictionaryData = (unsigned char *)malloc(BLOCK_SIZE);
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if (!pDictionaryData) {
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return LZSA_ERROR_MEMORY;
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}
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FILE *pDictionaryFile = fopen(pszDictionaryFilename, "rb");
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if (!pDictionaryFile) {
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free(pDictionaryData);
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pDictionaryData = NULL;
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return LZSA_ERROR_DICTIONARY;
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}
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fseek(pDictionaryFile, 0, SEEK_END);
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#ifdef _WIN32
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__int64 nDictionaryFileSize = _ftelli64(pDictionaryFile);
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#else
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off_t nDictionaryFileSize = ftello(pDictionaryFile);
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#endif
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if (nDictionaryFileSize > BLOCK_SIZE) {
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/* Use the last BLOCK_SIZE bytes of the dictionary */
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fseek(pDictionaryFile, -BLOCK_SIZE, SEEK_END);
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}
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else {
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fseek(pDictionaryFile, 0, SEEK_SET);
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}
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nDictionaryDataSize = (int)fread(pDictionaryData, 1, BLOCK_SIZE, pDictionaryFile);
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if (nDictionaryDataSize < 0)
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nDictionaryDataSize = 0;
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fclose(pDictionaryFile);
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pDictionaryFile = NULL;
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}
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*ppDictionaryData = pDictionaryData;
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*pDictionaryDataSize = nDictionaryDataSize;
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return LZSA_OK;
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}
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/**
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* Free dictionary contents
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*
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* @param ppDictionaryData pointer to pointer to dictionary contents
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*/
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void lzsa_dictionary_free(void **ppDictionaryData) {
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if (*ppDictionaryData) {
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free(*ppDictionaryData);
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*ppDictionaryData = NULL;
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}
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}
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