kopia lustrzana https://github.com/sp9skp/spdxl
85 wiersze
2.2 KiB
C
85 wiersze
2.2 KiB
C
/*
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* dxlAPRS toolchain
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*
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* Copyright (C) Christian Rabler <oe5dxl@oevsv.at>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include "X2C.h"
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#include <stdio.h>
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#include "jpeglib.h"
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#include <setjmp.h>
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#include <string.h>
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struct my_error_mgr {
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struct jpeg_error_mgr pub; /* "public" fields */
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jmp_buf setjmp_buffer; /* for return to caller */
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};
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typedef struct my_error_mgr * my_error_ptr;
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METHODDEF(void) my_error_exit (j_common_ptr cinfo)
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{
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/* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
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my_error_ptr myerr = (my_error_ptr) cinfo->err;
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/* Always display the message. */
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/* We could postpone this until after returning, if we chose. */
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(*cinfo->err->output_message) (cinfo);
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/* Return control to the setjmp point */
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longjmp(myerr->setjmp_buffer, 1);
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}
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int32_t readjpg(char *fn, JSAMPARRAY *row_pointers, int32_t *maxx, int32_t *maxy, int32_t *maxxbyte)
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{
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struct jpeg_decompress_struct cinfo;
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struct my_error_mgr jerr;
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FILE * infile; /* source file */
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int ret;
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int linec;
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JSAMPARRAY buffer; /* Output row buffer */
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int row_stride; /* physical row width in output buffer */
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if ((infile = fopen(fn, "rb")) == NULL) {
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/*
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fprintf(stderr, "can't open %s\n", fn);
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*/
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return -1;
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}
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cinfo.err = jpeg_std_error(&jerr.pub);
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jerr.pub.error_exit = my_error_exit;
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if (setjmp(jerr.setjmp_buffer)) {
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jpeg_destroy_decompress(&cinfo);
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fclose(infile);
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return -2;
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}
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ret=0;
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jpeg_create_decompress(&cinfo);
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jpeg_stdio_src(&cinfo, infile);
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(void) jpeg_read_header(&cinfo, TRUE);
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(void) jpeg_start_decompress(&cinfo);
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if (cinfo.output_height > *maxy || cinfo.output_width > *maxx || cinfo.output_components != 3)
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ret=-3;
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row_stride = cinfo.output_width * cinfo.output_components;
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buffer = (*cinfo.mem->alloc_sarray) ((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
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linec=0;
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while (cinfo.output_scanline < cinfo.output_height)
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{
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(void) jpeg_read_scanlines(&cinfo, (JSAMPARRAY) buffer, 1);
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if (linec < *maxy)
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memcpy(row_pointers[linec++], buffer[0], *maxxbyte);
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}
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(void) jpeg_finish_decompress(&cinfo);
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jpeg_destroy_decompress(&cinfo);
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fclose(infile);
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return ret;
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}
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