diff options
author | Jörg Frings-Fürst <debian@jff-webhosting.net> | 2015-11-06 07:14:47 +0100 |
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committer | Jörg Frings-Fürst <debian@jff-webhosting.net> | 2015-11-06 07:14:47 +0100 |
commit | d479dd1aab1c1cb907932c6595b0ef33523fc797 (patch) | |
tree | ad7d454b9edaae3d8892d84cd8f8ef5c2697b79b /jpeg/rdppm.c | |
parent | 9491825ddff7a294d1f49061bae7044e426aeb2e (diff) |
Imported Upstream version 1.8.3upstream/1.8.3
Diffstat (limited to 'jpeg/rdppm.c')
-rwxr-xr-x | jpeg/rdppm.c | 459 |
1 files changed, 0 insertions, 459 deletions
diff --git a/jpeg/rdppm.c b/jpeg/rdppm.c deleted file mode 100755 index a757022..0000000 --- a/jpeg/rdppm.c +++ /dev/null @@ -1,459 +0,0 @@ -/* - * rdppm.c - * - * Copyright (C) 1991-1997, Thomas G. Lane. - * Modified 2009 by Bill Allombert, Guido Vollbeding. - * This file is part of the Independent JPEG Group's software. - * For conditions of distribution and use, see the accompanying README file. - * - * This file contains routines to read input images in PPM/PGM format. - * The extended 2-byte-per-sample raw PPM/PGM formats are supported. - * The PBMPLUS library is NOT required to compile this software - * (but it is highly useful as a set of PPM image manipulation programs). - * - * These routines may need modification for non-Unix environments or - * specialized applications. As they stand, they assume input from - * an ordinary stdio stream. They further assume that reading begins - * at the start of the file; start_input may need work if the - * user interface has already read some data (e.g., to determine that - * the file is indeed PPM format). - */ - -#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ - -#ifdef PPM_SUPPORTED - - -/* Portions of this code are based on the PBMPLUS library, which is: -** -** Copyright (C) 1988 by Jef Poskanzer. -** -** Permission to use, copy, modify, and distribute this software and its -** documentation for any purpose and without fee is hereby granted, provided -** that the above copyright notice appear in all copies and that both that -** copyright notice and this permission notice appear in supporting -** documentation. This software is provided "as is" without express or -** implied warranty. -*/ - - -/* Macros to deal with unsigned chars as efficiently as compiler allows */ - -#ifdef HAVE_UNSIGNED_CHAR -typedef unsigned char U_CHAR; -#define UCH(x) ((int) (x)) -#else /* !HAVE_UNSIGNED_CHAR */ -#ifdef CHAR_IS_UNSIGNED -typedef char U_CHAR; -#define UCH(x) ((int) (x)) -#else -typedef char U_CHAR; -#define UCH(x) ((int) (x) & 0xFF) -#endif -#endif /* HAVE_UNSIGNED_CHAR */ - - -#define ReadOK(file,buffer,len) (JFREAD(file,buffer,len) == ((size_t) (len))) - - -/* - * On most systems, reading individual bytes with getc() is drastically less - * efficient than buffering a row at a time with fread(). On PCs, we must - * allocate the buffer in near data space, because we are assuming small-data - * memory model, wherein fread() can't reach far memory. If you need to - * process very wide images on a PC, you might have to compile in large-memory - * model, or else replace fread() with a getc() loop --- which will be much - * slower. - */ - - -/* Private version of data source object */ - -typedef struct { - struct cjpeg_source_struct pub; /* public fields */ - - U_CHAR *iobuffer; /* non-FAR pointer to I/O buffer */ - JSAMPROW pixrow; /* FAR pointer to same */ - size_t buffer_width; /* width of I/O buffer */ - JSAMPLE *rescale; /* => maxval-remapping array, or NULL */ -} ppm_source_struct; - -typedef ppm_source_struct * ppm_source_ptr; - - -LOCAL(int) -pbm_getc (FILE * infile) -/* Read next char, skipping over any comments */ -/* A comment/newline sequence is returned as a newline */ -{ - register int ch; - - ch = getc(infile); - if (ch == '#') { - do { - ch = getc(infile); - } while (ch != '\n' && ch != EOF); - } - return ch; -} - - -LOCAL(unsigned int) -read_pbm_integer (j_compress_ptr cinfo, FILE * infile) -/* Read an unsigned decimal integer from the PPM file */ -/* Swallows one trailing character after the integer */ -/* Note that on a 16-bit-int machine, only values up to 64k can be read. */ -/* This should not be a problem in practice. */ -{ - register int ch; - register unsigned int val; - - /* Skip any leading whitespace */ - do { - ch = pbm_getc(infile); - if (ch == EOF) - ERREXIT(cinfo, JERR_INPUT_EOF); - } while (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r'); - - if (ch < '0' || ch > '9') - ERREXIT(cinfo, JERR_PPM_NONNUMERIC); - - val = ch - '0'; - while ((ch = pbm_getc(infile)) >= '0' && ch <= '9') { - val *= 10; - val += ch - '0'; - } - return val; -} - - -/* - * Read one row of pixels. - * - * We provide several different versions depending on input file format. - * In all cases, input is scaled to the size of JSAMPLE. - * - * A really fast path is provided for reading byte/sample raw files with - * maxval = MAXJSAMPLE, which is the normal case for 8-bit data. - */ - - -METHODDEF(JDIMENSION) -get_text_gray_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) -/* This version is for reading text-format PGM files with any maxval */ -{ - ppm_source_ptr source = (ppm_source_ptr) sinfo; - FILE * infile = source->pub.input_file; - register JSAMPROW ptr; - register JSAMPLE *rescale = source->rescale; - JDIMENSION col; - - ptr = source->pub.buffer[0]; - for (col = cinfo->image_width; col > 0; col--) { - *ptr++ = rescale[read_pbm_integer(cinfo, infile)]; - } - return 1; -} - - -METHODDEF(JDIMENSION) -get_text_rgb_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) -/* This version is for reading text-format PPM files with any maxval */ -{ - ppm_source_ptr source = (ppm_source_ptr) sinfo; - FILE * infile = source->pub.input_file; - register JSAMPROW ptr; - register JSAMPLE *rescale = source->rescale; - JDIMENSION col; - - ptr = source->pub.buffer[0]; - for (col = cinfo->image_width; col > 0; col--) { - *ptr++ = rescale[read_pbm_integer(cinfo, infile)]; - *ptr++ = rescale[read_pbm_integer(cinfo, infile)]; - *ptr++ = rescale[read_pbm_integer(cinfo, infile)]; - } - return 1; -} - - -METHODDEF(JDIMENSION) -get_scaled_gray_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) -/* This version is for reading raw-byte-format PGM files with any maxval */ -{ - ppm_source_ptr source = (ppm_source_ptr) sinfo; - register JSAMPROW ptr; - register U_CHAR * bufferptr; - register JSAMPLE *rescale = source->rescale; - JDIMENSION col; - - if (! ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width)) - ERREXIT(cinfo, JERR_INPUT_EOF); - ptr = source->pub.buffer[0]; - bufferptr = source->iobuffer; - for (col = cinfo->image_width; col > 0; col--) { - *ptr++ = rescale[UCH(*bufferptr++)]; - } - return 1; -} - - -METHODDEF(JDIMENSION) -get_scaled_rgb_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) -/* This version is for reading raw-byte-format PPM files with any maxval */ -{ - ppm_source_ptr source = (ppm_source_ptr) sinfo; - register JSAMPROW ptr; - register U_CHAR * bufferptr; - register JSAMPLE *rescale = source->rescale; - JDIMENSION col; - - if (! ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width)) - ERREXIT(cinfo, JERR_INPUT_EOF); - ptr = source->pub.buffer[0]; - bufferptr = source->iobuffer; - for (col = cinfo->image_width; col > 0; col--) { - *ptr++ = rescale[UCH(*bufferptr++)]; - *ptr++ = rescale[UCH(*bufferptr++)]; - *ptr++ = rescale[UCH(*bufferptr++)]; - } - return 1; -} - - -METHODDEF(JDIMENSION) -get_raw_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) -/* This version is for reading raw-byte-format files with maxval = MAXJSAMPLE. - * In this case we just read right into the JSAMPLE buffer! - * Note that same code works for PPM and PGM files. - */ -{ - ppm_source_ptr source = (ppm_source_ptr) sinfo; - - if (! ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width)) - ERREXIT(cinfo, JERR_INPUT_EOF); - return 1; -} - - -METHODDEF(JDIMENSION) -get_word_gray_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) -/* This version is for reading raw-word-format PGM files with any maxval */ -{ - ppm_source_ptr source = (ppm_source_ptr) sinfo; - register JSAMPROW ptr; - register U_CHAR * bufferptr; - register JSAMPLE *rescale = source->rescale; - JDIMENSION col; - - if (! ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width)) - ERREXIT(cinfo, JERR_INPUT_EOF); - ptr = source->pub.buffer[0]; - bufferptr = source->iobuffer; - for (col = cinfo->image_width; col > 0; col--) { - register int temp; - temp = UCH(*bufferptr++) << 8; - temp |= UCH(*bufferptr++); - *ptr++ = rescale[temp]; - } - return 1; -} - - -METHODDEF(JDIMENSION) -get_word_rgb_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) -/* This version is for reading raw-word-format PPM files with any maxval */ -{ - ppm_source_ptr source = (ppm_source_ptr) sinfo; - register JSAMPROW ptr; - register U_CHAR * bufferptr; - register JSAMPLE *rescale = source->rescale; - JDIMENSION col; - - if (! ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width)) - ERREXIT(cinfo, JERR_INPUT_EOF); - ptr = source->pub.buffer[0]; - bufferptr = source->iobuffer; - for (col = cinfo->image_width; col > 0; col--) { - register int temp; - temp = UCH(*bufferptr++) << 8; - temp |= UCH(*bufferptr++); - *ptr++ = rescale[temp]; - temp = UCH(*bufferptr++) << 8; - temp |= UCH(*bufferptr++); - *ptr++ = rescale[temp]; - temp = UCH(*bufferptr++) << 8; - temp |= UCH(*bufferptr++); - *ptr++ = rescale[temp]; - } - return 1; -} - - -/* - * Read the file header; return image size and component count. - */ - -METHODDEF(void) -start_input_ppm (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) -{ - ppm_source_ptr source = (ppm_source_ptr) sinfo; - int c; - unsigned int w, h, maxval; - boolean need_iobuffer, use_raw_buffer, need_rescale; - - if (getc(source->pub.input_file) != 'P') - ERREXIT(cinfo, JERR_PPM_NOT); - - c = getc(source->pub.input_file); /* subformat discriminator character */ - - /* detect unsupported variants (ie, PBM) before trying to read header */ - switch (c) { - case '2': /* it's a text-format PGM file */ - case '3': /* it's a text-format PPM file */ - case '5': /* it's a raw-format PGM file */ - case '6': /* it's a raw-format PPM file */ - break; - default: - ERREXIT(cinfo, JERR_PPM_NOT); - break; - } - - /* fetch the remaining header info */ - w = read_pbm_integer(cinfo, source->pub.input_file); - h = read_pbm_integer(cinfo, source->pub.input_file); - maxval = read_pbm_integer(cinfo, source->pub.input_file); - - if (w <= 0 || h <= 0 || maxval <= 0) /* error check */ - ERREXIT(cinfo, JERR_PPM_NOT); - - cinfo->data_precision = BITS_IN_JSAMPLE; /* we always rescale data to this */ - cinfo->image_width = (JDIMENSION) w; - cinfo->image_height = (JDIMENSION) h; - - /* initialize flags to most common settings */ - need_iobuffer = TRUE; /* do we need an I/O buffer? */ - use_raw_buffer = FALSE; /* do we map input buffer onto I/O buffer? */ - need_rescale = TRUE; /* do we need a rescale array? */ - - switch (c) { - case '2': /* it's a text-format PGM file */ - cinfo->input_components = 1; - cinfo->in_color_space = JCS_GRAYSCALE; - TRACEMS2(cinfo, 1, JTRC_PGM_TEXT, w, h); - source->pub.get_pixel_rows = get_text_gray_row; - need_iobuffer = FALSE; - break; - - case '3': /* it's a text-format PPM file */ - cinfo->input_components = 3; - cinfo->in_color_space = JCS_RGB; - TRACEMS2(cinfo, 1, JTRC_PPM_TEXT, w, h); - source->pub.get_pixel_rows = get_text_rgb_row; - need_iobuffer = FALSE; - break; - - case '5': /* it's a raw-format PGM file */ - cinfo->input_components = 1; - cinfo->in_color_space = JCS_GRAYSCALE; - TRACEMS2(cinfo, 1, JTRC_PGM, w, h); - if (maxval > 255) { - source->pub.get_pixel_rows = get_word_gray_row; - } else if (maxval == MAXJSAMPLE && SIZEOF(JSAMPLE) == SIZEOF(U_CHAR)) { - source->pub.get_pixel_rows = get_raw_row; - use_raw_buffer = TRUE; - need_rescale = FALSE; - } else { - source->pub.get_pixel_rows = get_scaled_gray_row; - } - break; - - case '6': /* it's a raw-format PPM file */ - cinfo->input_components = 3; - cinfo->in_color_space = JCS_RGB; - TRACEMS2(cinfo, 1, JTRC_PPM, w, h); - if (maxval > 255) { - source->pub.get_pixel_rows = get_word_rgb_row; - } else if (maxval == MAXJSAMPLE && SIZEOF(JSAMPLE) == SIZEOF(U_CHAR)) { - source->pub.get_pixel_rows = get_raw_row; - use_raw_buffer = TRUE; - need_rescale = FALSE; - } else { - source->pub.get_pixel_rows = get_scaled_rgb_row; - } - break; - } - - /* Allocate space for I/O buffer: 1 or 3 bytes or words/pixel. */ - if (need_iobuffer) { - source->buffer_width = (size_t) w * cinfo->input_components * - ((maxval<=255) ? SIZEOF(U_CHAR) : (2*SIZEOF(U_CHAR))); - source->iobuffer = (U_CHAR *) - (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, - source->buffer_width); - } - - /* Create compressor input buffer. */ - if (use_raw_buffer) { - /* For unscaled raw-input case, we can just map it onto the I/O buffer. */ - /* Synthesize a JSAMPARRAY pointer structure */ - /* Cast here implies near->far pointer conversion on PCs */ - source->pixrow = (JSAMPROW) source->iobuffer; - source->pub.buffer = & source->pixrow; - source->pub.buffer_height = 1; - } else { - /* Need to translate anyway, so make a separate sample buffer. */ - source->pub.buffer = (*cinfo->mem->alloc_sarray) - ((j_common_ptr) cinfo, JPOOL_IMAGE, - (JDIMENSION) w * cinfo->input_components, (JDIMENSION) 1); - source->pub.buffer_height = 1; - } - - /* Compute the rescaling array if required. */ - if (need_rescale) { - INT32 val, half_maxval; - - /* On 16-bit-int machines we have to be careful of maxval = 65535 */ - source->rescale = (JSAMPLE *) - (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, - (size_t) (((long) maxval + 1L) * SIZEOF(JSAMPLE))); - half_maxval = maxval / 2; - for (val = 0; val <= (INT32) maxval; val++) { - /* The multiplication here must be done in 32 bits to avoid overflow */ - source->rescale[val] = (JSAMPLE) ((val*MAXJSAMPLE + half_maxval)/maxval); - } - } -} - - -/* - * Finish up at the end of the file. - */ - -METHODDEF(void) -finish_input_ppm (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) -{ - /* no work */ -} - - -/* - * The module selection routine for PPM format input. - */ - -GLOBAL(cjpeg_source_ptr) -jinit_read_ppm (j_compress_ptr cinfo) -{ - ppm_source_ptr source; - - /* Create module interface object */ - source = (ppm_source_ptr) - (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, - SIZEOF(ppm_source_struct)); - /* Fill in method ptrs, except get_pixel_rows which start_input sets */ - source->pub.start_input = start_input_ppm; - source->pub.finish_input = finish_input_ppm; - - return (cjpeg_source_ptr) source; -} - -#endif /* PPM_SUPPORTED */ |