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