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289 lines
6.8 KiB
C
289 lines
6.8 KiB
C
/*
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Copyright 2019, James R.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "apng.h"
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#define APNG_INFO_acTL 0x20000U
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#define APNG_WROTE_acTL 0x10000U
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struct apng_info_def
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{
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png_uint_32 mode;
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png_uint_32 valid;
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png_uint_32 num_frames;
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png_uint_32 num_plays;
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long start_acTL;/* acTL is written here */
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png_flush_ptr output_flush_fn;
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apng_seek_ptr output_seek_fn;
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apng_tell_ptr output_tell_fn;
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apng_set_acTL_ptr set_acTL_fn;
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};
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/* PROTOS (FUCK COMPILER) */
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void apng_seek (png_structp, apng_const_infop, size_t);
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size_t apng_tell (png_structp, apng_const_infop);
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#ifdef PNG_WRITE_FLUSH_SUPPORTED
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void apng_flush (png_structp, apng_infop);
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#ifdef PNG_STDIO_SUPPORTED
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void apng_default_flush (png_structp);
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#endif/* PNG_STDIO_SUPPORTED */
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#endif/* PNG_WRITE_FLUSH_SUPPORTED */
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#ifdef PNG_STDIO_SUPPORTED
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void apng_default_seek (png_structp, size_t);
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size_t apng_default_tell (png_structp);
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#endif/* PNG_STDIO_SUPPORTED */
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void apng_write_IEND (png_structp);
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void apng_write_acTL (png_structp, png_uint_32, png_uint_32);
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#ifndef PNG_WRITE_APNG_SUPPORTED
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png_uint_32 apng_set_acTL_dummy (png_structp, png_infop,
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png_uint_32, png_uint_32);
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#endif/* PNG_WRITE_APNG_SUPPORTED */
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apng_infop
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apng_create_info_struct (png_structp pngp)
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{
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apng_infop ainfop;
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(void)pngp;
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if (( ainfop = calloc(sizeof (apng_info),1) ))
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{
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apng_set_write_fn(pngp, ainfop, 0, 0, 0, 0, 0);
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apng_set_set_acTL_fn(pngp, ainfop, 0);
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}
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return ainfop;
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}
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void
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apng_destroy_info_struct (png_structp pngp, apng_infopp ainfopp)
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{
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(void)pngp;
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if (!( pngp && ainfopp ))
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return;
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free((*ainfopp));
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}
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void
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apng_seek (png_structp pngp, apng_const_infop ainfop, size_t l)
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{
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(*(ainfop->output_seek_fn))(pngp, l);
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}
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size_t
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apng_tell (png_structp pngp, apng_const_infop ainfop)
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{
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return (*(ainfop->output_tell_fn))(pngp);
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}
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#ifdef PNG_WRITE_FLUSH_SUPPORTED
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void
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apng_flush (png_structp pngp, apng_infop ainfop)
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{
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if (ainfop->output_flush_fn)
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(*(ainfop->output_flush_fn))(pngp);
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}
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#ifdef PNG_STDIO_SUPPORTED
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void
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apng_default_flush (png_structp pngp)
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{
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if (!( pngp ))
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return;
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fflush((png_FILE_p)png_get_io_ptr);
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}
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#endif/* PNG_STDIO_SUPPORTED */
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#endif/* PNG_WRITE_FLUSH_SUPPORTED */
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#ifdef PNG_STDIO_SUPPORTED
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void
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apng_default_seek (png_structp pngp, size_t l)
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{
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if (!( pngp ))
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return;
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if (fseek((png_FILE_p)png_get_io_ptr(pngp), (long)l, SEEK_SET) == -1)
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png_error(pngp, "Seek Error");
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}
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size_t
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apng_default_tell (png_structp pngp)
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{
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long l;
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if (!( pngp ))
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{
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png_error(pngp, "Call to apng_default_tell with NULL pngp failed");
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}
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if (( l = ftell((png_FILE_p)png_get_io_ptr(pngp)) ) == -1)
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png_error(pngp, "Tell Error");
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return (size_t)l;
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}
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#endif/* PNG_STDIO_SUPPORTED */
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void
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apng_set_write_fn (png_structp pngp, apng_infop ainfop, png_voidp iop,
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png_rw_ptr write_f, png_flush_ptr flush_f,
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apng_seek_ptr seek_f, apng_tell_ptr tell_f)
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{
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if (!( pngp && ainfop ))
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return;
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png_set_write_fn(pngp, iop, write_f, flush_f);
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#ifdef PNG_WRITE_FLUSH_SUPPORTED
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#ifdef PNG_STDIO_SUPPORTED
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if (!flush_f)
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ainfop->output_flush_fn = &apng_default_flush;
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else
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#endif/* PNG_STDIO_SUPPORTED */
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ainfop->output_flush_fn = flush_f;
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#endif/* PNG_WRITE_FLUSH_SUPPORTED */
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#ifdef PNG_STDIO_SUPPORTED
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if (!seek_f)
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ainfop->output_seek_fn = &apng_default_seek;
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else
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#endif/* PNG_STDIO_SUPPORTED */
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ainfop->output_seek_fn = seek_f;
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#ifdef PNG_STDIO_SUPPORTED
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if (!seek_f)
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ainfop->output_tell_fn = apng_default_tell;
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else
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#endif/* PNG_STDIO_SUPPORTED */
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ainfop->output_tell_fn = tell_f;
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}
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void
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apng_write_IEND (png_structp pngp)
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{
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png_byte chunkc[] = "IEND";
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png_write_chunk(pngp, chunkc, 0, 0);
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}
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void
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apng_write_acTL (png_structp pngp, png_uint_32 frames, png_uint_32 plays)
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{
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png_byte chunkc[] = "acTL";
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png_byte buf[8];
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png_save_uint_32(buf, frames);
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png_save_uint_32(buf + 4, plays);
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png_write_chunk(pngp, chunkc, buf, 8);
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}
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png_uint_32
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apng_set_acTL (png_structp pngp, png_infop infop, apng_infop ainfop,
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png_uint_32 frames, png_uint_32 plays)
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{
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(void)pngp;
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(void)infop;
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if (!( pngp && infop && ainfop ))
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return 0;
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ainfop->num_frames = frames;
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ainfop->num_plays = plays;
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ainfop->valid |= APNG_INFO_acTL;
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return 1;
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}
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void
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apng_write_info_before_PLTE (png_structp pngp, png_infop infop,
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apng_infop ainfop)
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{
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if (!( pngp && infop && ainfop ))
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return;
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png_write_info_before_PLTE(pngp, infop);
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if (( ainfop->valid & APNG_INFO_acTL )&&!( ainfop->mode & APNG_WROTE_acTL ))
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{
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ainfop->start_acTL = apng_tell(pngp, ainfop);
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apng_write_acTL(pngp, 0, 0);
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/* modified for runtime dynamic linking */
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(*(ainfop->set_acTL_fn))(pngp, infop, PNG_UINT_31_MAX, 0);
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ainfop->mode |= APNG_WROTE_acTL;
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}
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}
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void
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apng_write_info (png_structp pngp, png_infop infop,
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apng_infop ainfop)
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{
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apng_write_info_before_PLTE(pngp, infop, ainfop);
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png_write_info(pngp, infop);
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}
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void
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apng_write_end (png_structp pngp, png_infop infop, apng_infop ainfop)
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{
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(void)infop;
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apng_write_IEND(pngp);
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apng_seek(pngp, ainfop, ainfop->start_acTL);
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apng_write_acTL(pngp, ainfop->num_frames, ainfop->num_plays);
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#ifdef PNG_WRITE_FLUSH_SUPPORTED
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#ifdef PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED
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apng_flush(pngp, infop);
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#endif/* PNG_WRITE_FLUSH_SUPPORTED */
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#endif/* PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED */
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}
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#ifndef PNG_WRITE_APNG_SUPPORTED
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png_uint_32
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apng_set_acTL_dummy (png_structp pngp, png_infop infop,
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png_uint_32 frames, png_uint_32 plays)
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{
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(void)pngp;
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(void)infop;
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(void)frames;
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(void)plays;
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return 0;
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}
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#endif/* PNG_WRITE_APNG_SUPPORTED */
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/* Dynamic runtime linking capable! (Hopefully.) */
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void
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apng_set_set_acTL_fn (png_structp pngp, apng_infop ainfop,
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apng_set_acTL_ptr set_acTL_f)
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{
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(void)pngp;
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if (!ainfop->set_acTL_fn)
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#ifndef PNG_WRITE_APNG_SUPPORTED
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ainfop->set_acTL_fn = &apng_set_acTL_dummy;
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#else
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ainfop->set_acTL_fn = &png_set_acTL;
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#endif/* PNG_WRITE_APNG_SUPPORTED */
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else
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ainfop->set_acTL_fn = set_acTL_f;
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}
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