88 lines
3.3 KiB
C
88 lines
3.3 KiB
C
// Copyright (C) 2004-2021 Artifex Software, Inc.
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//
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// This file is part of MuPDF.
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//
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// MuPDF is free software: you can redistribute it and/or modify it under the
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// terms of the GNU Affero General Public License as published by the Free
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// Software Foundation, either version 3 of the License, or (at your option)
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// any later version.
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//
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// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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// details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
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//
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// Alternative licensing terms are available from the licensor.
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// For commercial licensing, see <https://www.artifex.com/> or contact
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// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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// CA 94129, USA, for further information.
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#ifndef MUPDF_FITZ_COMPRESS_H
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#define MUPDF_FITZ_COMPRESS_H
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#include "mupdf/fitz/system.h"
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#include "mupdf/fitz/buffer.h"
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typedef enum
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{
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FZ_DEFLATE_NONE = 0,
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FZ_DEFLATE_BEST_SPEED = 1,
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FZ_DEFLATE_BEST = 9,
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FZ_DEFLATE_DEFAULT = -1
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} fz_deflate_level;
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/**
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Returns the upper bound on the
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size of flated data of length size.
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*/
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size_t fz_deflate_bound(fz_context *ctx, size_t size);
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/**
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Compress source_length bytes of data starting
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at source, into a buffer of length *destLen, starting at dest.
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*compressed_length will be updated on exit to contain the size
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actually used.
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*/
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void fz_deflate(fz_context *ctx, unsigned char *dest, size_t *compressed_length, const unsigned char *source, size_t source_length, fz_deflate_level level);
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/**
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Compress source_length bytes of data starting
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at source, into a new memory block malloced for that purpose.
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*compressed_length is updated on exit to contain the size used.
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Ownership of the block is returned from this function, and the
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caller is therefore responsible for freeing it. The block may be
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considerably larger than is actually required. The caller is
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free to fz_realloc it down if it wants to.
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*/
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unsigned char *fz_new_deflated_data(fz_context *ctx, size_t *compressed_length, const unsigned char *source, size_t source_length, fz_deflate_level level);
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/**
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Compress the contents of a fz_buffer into a
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new block malloced for that purpose. *compressed_length is
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updated on exit to contain the size used. Ownership of the block
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is returned from this function, and the caller is therefore
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responsible for freeing it. The block may be considerably larger
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than is actually required. The caller is free to fz_realloc it
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down if it wants to.
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*/
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unsigned char *fz_new_deflated_data_from_buffer(fz_context *ctx, size_t *compressed_length, fz_buffer *buffer, fz_deflate_level level);
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/**
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Compress bitmap data as CCITT Group 3 1D fax image.
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Creates a stream assuming the default PDF parameters,
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except the number of columns.
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*/
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fz_buffer *fz_compress_ccitt_fax_g3(fz_context *ctx, const unsigned char *data, int columns, int rows);
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/**
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Compress bitmap data as CCITT Group 4 2D fax image.
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Creates a stream assuming the default PDF parameters, except
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K=-1 and the number of columns.
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*/
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fz_buffer *fz_compress_ccitt_fax_g4(fz_context *ctx, const unsigned char *data, int columns, int rows);
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#endif
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