forked from AuroraMiddleware/gtk
5ebe8faab2
* test-images.h: Add valid_ras_test and invalid_bmp_1. * test-loaders.c (main): Add random tests for ras and pnm and an invalid bmp which was a crasher until my 2002-03-12 commit. * io-pnm.c (gdk_pixbuf__pnm_image_load_increment): Don't unref the pixbuf on errors. * io-ras.c: Handle some errors.
1045 lines
24 KiB
C
1045 lines
24 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
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/* GdkPixbuf library - PNM image loader
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*
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* Copyright (C) 1999 Red Hat, Inc.
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*
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* Authors: Jeffrey Stedfast <fejj@helixcode.com>
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* Michael Fulbright <drmike@redhat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <setjmp.h>
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#include "gdk-pixbuf-private.h"
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#include "gdk-pixbuf-io.h"
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#define PNM_BUF_SIZE 4096
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#define PNM_FATAL_ERR -1
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#define PNM_SUSPEND 0
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#define PNM_OK 1
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typedef enum {
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PNM_FORMAT_PGM = 1,
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PNM_FORMAT_PGM_RAW,
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PNM_FORMAT_PPM,
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PNM_FORMAT_PPM_RAW,
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PNM_FORMAT_PBM,
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PNM_FORMAT_PBM_RAW
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} PnmFormat;
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typedef struct {
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guchar buffer[PNM_BUF_SIZE];
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guchar *byte;
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guint nbytes;
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} PnmIOBuffer;
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typedef struct {
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ModuleUpdatedNotifyFunc updated_func;
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ModulePreparedNotifyFunc prepared_func;
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gpointer user_data;
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GdkPixbuf *pixbuf;
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guchar *pixels; /* incoming pixel data buffer */
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guchar *dptr; /* current position in pixbuf */
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PnmIOBuffer inbuf;
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guint width;
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guint height;
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guint maxval;
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guint rowstride;
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PnmFormat type;
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guint output_row; /* last row to be completed */
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guint output_col;
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gboolean did_prescan; /* are we in image data yet? */
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gboolean got_header; /* have we loaded pnm header? */
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guint scan_state;
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GError **error;
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} PnmLoaderContext;
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static GdkPixbuf *gdk_pixbuf__pnm_image_load (FILE *f, GError **error);
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static gpointer gdk_pixbuf__pnm_image_begin_load (ModulePreparedNotifyFunc func,
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ModuleUpdatedNotifyFunc func2,
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gpointer user_data,
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GError **error);
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static gboolean gdk_pixbuf__pnm_image_stop_load (gpointer context, GError **error);
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static gboolean gdk_pixbuf__pnm_image_load_increment (gpointer context,
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const guchar *buf, guint size,
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GError **error);
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static void explode_bitmap_into_buf (PnmLoaderContext *context);
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static void explode_gray_into_buf (PnmLoaderContext *context);
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/* Destroy notification function for the pixbuf */
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static void
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free_buffer (guchar *pixels, gpointer data)
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{
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g_free (pixels);
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}
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/* explode bitmap data into rgb components */
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/* we need to know what the row so we can */
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/* do sub-byte expansion (since 1 byte = 8 pixels) */
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/* context->dptr MUST point at first byte in incoming data */
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/* which corresponds to first pixel of row y */
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static void
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explode_bitmap_into_buf (PnmLoaderContext *context)
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{
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gint j;
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guchar *from, *to, data;
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gint bit;
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guchar *dptr;
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gint wid, x, y;
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g_return_if_fail (context != NULL);
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g_return_if_fail (context->dptr != NULL);
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/* I'm no clever bit-hacker so I'm sure this can be optimized */
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dptr = context->dptr;
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y = context->output_row;
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wid = context->width;
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from = dptr + ((wid - 1) / 8);
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to = dptr + (wid - 1) * 3;
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/* bit = 7 - (((y+1)*wid-1) % 8); */
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bit = 7 - ((wid-1) % 8);
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/* get first byte and align properly */
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data = from[0];
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for (j = 0; j < bit; j++, data >>= 1);
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for (x = wid-1; x >= 0; x--) {
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/* g_print ("%c", (data & 1) ? '*' : ' '); */
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to[0] = to[1] = to[2] = (data & 0x01) ? 0x00 : 0xff;
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to -= 3;
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bit++;
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if (bit > 7) {
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from--;
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data = from[0];
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bit = 0;
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} else {
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data >>= 1;
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}
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}
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/* g_print ("\n"); */
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}
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/* explode gray image row into rgb components in pixbuf */
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static void
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explode_gray_into_buf (PnmLoaderContext *context)
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{
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gint j;
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guchar *from, *to;
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guint w;
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g_return_if_fail (context != NULL);
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g_return_if_fail (context->dptr != NULL);
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/* Expand grey->colour. Expand from the end of the
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* memory down, so we can use the same buffer.
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*/
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w = context->width;
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from = context->dptr + w - 1;
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to = context->dptr + (w - 1) * 3;
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for (j = w - 1; j >= 0; j--) {
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to[0] = from[0];
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to[1] = from[0];
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to[2] = from[0];
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to -= 3;
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from--;
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}
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}
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/* skip over whitespace and comments in input buffer */
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static gint
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pnm_skip_whitespace (PnmIOBuffer *inbuf, GError **error)
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{
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register guchar *inptr;
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guchar *inend;
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g_return_val_if_fail (inbuf != NULL, PNM_FATAL_ERR);
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g_return_val_if_fail (inbuf->byte != NULL, PNM_FATAL_ERR);
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inend = inbuf->byte + inbuf->nbytes;
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inptr = inbuf->byte;
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for ( ; inptr < inend; inptr++) {
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if (*inptr == '#') {
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/* in comment - skip to the end of this line */
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for ( ; *inptr != '\n' && inptr < inend; inptr++)
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;
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if ( *inptr != '\n' ) {
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/* couldn't read whole comment */
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return PNM_SUSPEND;
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}
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} else if (!g_ascii_isspace (*inptr)) {
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inbuf->byte = inptr;
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inbuf->nbytes = (guint) (inend - inptr);
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return PNM_OK;
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}
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}
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inbuf->byte = inptr;
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inbuf->nbytes = (guint) (inend - inptr);
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return PNM_SUSPEND;
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}
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/* read next number from buffer */
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static gint
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pnm_read_next_value (PnmIOBuffer *inbuf, guint *value, GError **error)
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{
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register guchar *inptr, *word, *p;
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guchar *inend, buf[129];
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gchar *endptr;
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gint retval;
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glong result;
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g_return_val_if_fail (inbuf != NULL, PNM_FATAL_ERR);
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g_return_val_if_fail (inbuf->byte != NULL, PNM_FATAL_ERR);
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g_return_val_if_fail (value != NULL, PNM_FATAL_ERR);
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/* skip white space */
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if ((retval = pnm_skip_whitespace (inbuf, error)) != PNM_OK)
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return retval;
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inend = inbuf->byte + inbuf->nbytes;
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inptr = inbuf->byte;
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/* copy this pnm 'word' into a temp buffer */
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for (p = inptr, word = buf; (p < inend) && !g_ascii_isspace (*p) && (*p != '#') && (p - inptr < 128); p++, word++)
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*word = *p;
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*word = '\0';
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/* hmmm, there must be more data to this 'word' */
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if (!g_ascii_isspace (*p) && (*p != '#') && (p - inptr < 128))
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return PNM_SUSPEND;
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/* get the value */
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result = strtol (buf, &endptr, 10);
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if (*endptr != '\0' || result < 0) {
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g_set_error (error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("PNM loader expected to find an integer, but didn't"));
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return PNM_FATAL_ERR;
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}
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*value = result;
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inbuf->byte = p;
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inbuf->nbytes = (guint) (inend - p);
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return PNM_OK;
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}
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/* returns PNM_OK, PNM_SUSPEND, or PNM_FATAL_ERR */
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static gint
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pnm_read_header (PnmLoaderContext *context)
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{
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PnmIOBuffer *inbuf;
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gint retval;
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g_return_val_if_fail (context != NULL, PNM_FATAL_ERR);
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inbuf = &context->inbuf;
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if (!context->type) {
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/* file must start with a 'P' followed by a numeral */
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/* so loop till we get enough data to determine type */
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if (inbuf->nbytes < 2)
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return PNM_SUSPEND;
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if (*inbuf->byte != 'P') {
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g_set_error (context->error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("PNM file has an incorrect initial byte"));
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return PNM_FATAL_ERR;
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}
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inbuf->byte++;
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inbuf->nbytes--;
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switch (*inbuf->byte) {
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case '1':
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context->type = PNM_FORMAT_PBM;
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break;
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case '2':
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context->type = PNM_FORMAT_PGM;
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break;
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case '3':
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context->type = PNM_FORMAT_PPM;
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break;
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case '4':
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context->type = PNM_FORMAT_PBM_RAW;
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break;
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case '5':
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context->type = PNM_FORMAT_PGM_RAW;
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break;
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case '6':
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context->type = PNM_FORMAT_PPM_RAW;
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break;
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default:
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g_set_error (context->error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("PNM file is not in a recognized PNM subformat"));
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return PNM_FATAL_ERR;
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}
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if (!inbuf->nbytes)
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return PNM_SUSPEND;
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inbuf->byte++;
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inbuf->nbytes--;
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}
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if (!context->width) {
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/* read the pixmap width */
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guint width = 0;
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retval = pnm_read_next_value (inbuf, &width,
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context->error);
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if (retval != PNM_OK)
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return retval;
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if (!width) {
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g_set_error (context->error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("PNM file has an image width of 0"));
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return PNM_FATAL_ERR;
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}
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context->width = width;
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}
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if (!context->height) {
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/* read the pixmap height */
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guint height = 0;
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retval = pnm_read_next_value (inbuf, &height,
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context->error);
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if (retval != PNM_OK)
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return retval;
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if (!height) {
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g_set_error (context->error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("PNM file has an image height of 0"));
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return PNM_FATAL_ERR;
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}
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context->height = height;
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}
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switch (context->type) {
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case PNM_FORMAT_PPM:
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case PNM_FORMAT_PPM_RAW:
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case PNM_FORMAT_PGM:
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case PNM_FORMAT_PGM_RAW:
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if (!context->maxval) {
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retval = pnm_read_next_value (inbuf, &context->maxval,
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context->error);
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if (retval != PNM_OK)
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return retval;
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if (context->maxval == 0) {
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g_set_error (context->error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("Maximum color value in PNM file is 0"));
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return PNM_FATAL_ERR;
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}
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if (context->maxval > 65535) {
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g_set_error (context->error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("Maximum color value in PNM file is too large"));
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return PNM_FATAL_ERR;
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}
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if (context->maxval > 255) {
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g_set_error (context->error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("Can't handle PNM files with maximum color values greater than 255"));
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return PNM_FATAL_ERR;
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}
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}
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break;
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default:
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break;
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}
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return PNM_OK;
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}
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static gint
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pnm_read_raw_scanline (PnmLoaderContext *context)
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{
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PnmIOBuffer *inbuf;
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guint numbytes, offset;
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guint numpix = 0;
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guchar *dest;
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guint i;
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g_return_val_if_fail (context != NULL, PNM_FATAL_ERR);
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inbuf = &context->inbuf;
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switch (context->type) {
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case PNM_FORMAT_PBM_RAW:
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numpix = inbuf->nbytes * 8;
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break;
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case PNM_FORMAT_PGM_RAW:
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numpix = inbuf->nbytes;
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break;
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case PNM_FORMAT_PPM_RAW:
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numpix = inbuf->nbytes / 3;
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break;
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default:
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g_set_error (context->error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("Raw PNM image type is invalid"));
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return PNM_FATAL_ERR;
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}
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numpix = MIN (numpix, context->width - context->output_col);
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if (!numpix)
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return PNM_SUSPEND;
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context->dptr = context->pixels + context->output_row * context->rowstride;
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switch (context->type) {
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case PNM_FORMAT_PBM_RAW:
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numbytes = (numpix / 8) + ((numpix % 8) ? 1 : 0);
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offset = context->output_col / 8;
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break;
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case PNM_FORMAT_PGM_RAW:
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numbytes = numpix;
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offset = context->output_col;
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break;
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case PNM_FORMAT_PPM_RAW:
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numbytes = numpix * 3;
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offset = context->output_col * 3;
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break;
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default:
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g_set_error (context->error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("Raw PNM image type is invalid"));
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return PNM_FATAL_ERR;
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}
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|
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switch (context->type) {
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case PNM_FORMAT_PBM_RAW:
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dest = context->dptr + offset;
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memcpy (dest, inbuf->byte, numbytes);
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break;
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case PNM_FORMAT_PGM_RAW:
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case PNM_FORMAT_PPM_RAW:
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dest = context->dptr + offset;
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if (context->maxval == 255) {
|
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/* special-case optimization */
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memcpy (dest, inbuf->byte, numbytes);
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} else {
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for (i = 0; i < numbytes; i++) {
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guchar *byte = inbuf->byte + i;
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/* scale the color to an 8-bit color depth */
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if (*byte > context->maxval)
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*dest++ = 255;
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else
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*dest++ = (guchar) (255 * *byte / context->maxval);
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}
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}
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break;
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default:
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g_set_error (context->error,
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GDK_PIXBUF_ERROR,
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GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
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_("Raw PNM image type is invalid"));
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return PNM_FATAL_ERR;
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}
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inbuf->byte += numbytes;
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inbuf->nbytes -= numbytes;
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context->output_col += numpix;
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if (context->output_col == context->width) {
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if (context->type == PNM_FORMAT_PBM_RAW)
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explode_bitmap_into_buf (context);
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else if (context->type == PNM_FORMAT_PGM_RAW)
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explode_gray_into_buf (context);
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context->output_col = 0;
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context->output_row++;
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} else {
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return PNM_SUSPEND;
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}
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return PNM_OK;
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}
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|
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static gint
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pnm_read_ascii_scanline (PnmLoaderContext *context)
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{
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PnmIOBuffer *inbuf;
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guint offset;
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guint value, numval, i;
|
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guchar data;
|
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guchar mask;
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guchar *dptr;
|
|
gint retval;
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|
|
|
g_return_val_if_fail (context != NULL, PNM_FATAL_ERR);
|
|
|
|
data = mask = 0;
|
|
|
|
inbuf = &context->inbuf;
|
|
|
|
context->dptr = context->pixels + context->output_row * context->rowstride;
|
|
|
|
switch (context->type) {
|
|
case PNM_FORMAT_PBM:
|
|
numval = MIN (8, context->width - context->output_col);
|
|
offset = context->output_col / 8;
|
|
break;
|
|
case PNM_FORMAT_PGM:
|
|
numval = 1;
|
|
offset = context->output_col;
|
|
break;
|
|
case PNM_FORMAT_PPM:
|
|
numval = 3;
|
|
offset = context->output_col * 3;
|
|
break;
|
|
|
|
default:
|
|
g_set_error (context->error,
|
|
GDK_PIXBUF_ERROR,
|
|
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
|
_("PNM image format is invalid"));
|
|
|
|
return PNM_FATAL_ERR;
|
|
}
|
|
|
|
dptr = context->dptr + offset + context->scan_state;
|
|
|
|
while (TRUE) {
|
|
if (context->type == PNM_FORMAT_PBM) {
|
|
mask = 0x80;
|
|
data = 0;
|
|
numval = MIN (8, context->width - context->output_col);
|
|
}
|
|
|
|
for (i = context->scan_state; i < numval; i++) {
|
|
retval = pnm_read_next_value (inbuf, &value,
|
|
context->error);
|
|
if (retval != PNM_OK) {
|
|
/* save state and return */
|
|
context->scan_state = i;
|
|
return retval;
|
|
}
|
|
|
|
switch (context->type) {
|
|
case PNM_FORMAT_PBM:
|
|
if (value)
|
|
data |= mask;
|
|
mask >>= 1;
|
|
|
|
break;
|
|
case PNM_FORMAT_PGM:
|
|
case PNM_FORMAT_PPM:
|
|
/* scale the color to an 8-bit color depth */
|
|
if (value > context->maxval)
|
|
*dptr++ = 255;
|
|
else
|
|
*dptr++ = (guchar)(255 * value / context->maxval);
|
|
break;
|
|
default:
|
|
g_set_error (context->error,
|
|
GDK_PIXBUF_ERROR,
|
|
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
|
_("PNM image format is invalid"));
|
|
return PNM_FATAL_ERR;
|
|
break;
|
|
}
|
|
}
|
|
|
|
context->scan_state = 0;
|
|
|
|
if (context->type == PNM_FORMAT_PBM) {
|
|
*dptr++ = data;
|
|
context->output_col += numval;
|
|
} else {
|
|
context->output_col++;
|
|
}
|
|
|
|
if (context->output_col == context->width) {
|
|
if (context->type == PNM_FORMAT_PBM)
|
|
explode_bitmap_into_buf (context);
|
|
else if (context->type == PNM_FORMAT_PGM)
|
|
explode_gray_into_buf (context);
|
|
|
|
context->output_col = 0;
|
|
context->output_row++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return PNM_OK;
|
|
}
|
|
|
|
/* returns 1 if a scanline was converted, 0 means we ran out of data */
|
|
static gint
|
|
pnm_read_scanline (PnmLoaderContext *context)
|
|
{
|
|
gint retval;
|
|
|
|
g_return_val_if_fail (context != NULL, PNM_FATAL_ERR);
|
|
|
|
/* read in image data */
|
|
/* for raw formats this is trivial */
|
|
switch (context->type) {
|
|
case PNM_FORMAT_PBM_RAW:
|
|
case PNM_FORMAT_PGM_RAW:
|
|
case PNM_FORMAT_PPM_RAW:
|
|
retval = pnm_read_raw_scanline (context);
|
|
if (retval != PNM_OK)
|
|
return retval;
|
|
break;
|
|
case PNM_FORMAT_PBM:
|
|
case PNM_FORMAT_PGM:
|
|
case PNM_FORMAT_PPM:
|
|
retval = pnm_read_ascii_scanline (context);
|
|
if (retval != PNM_OK)
|
|
return retval;
|
|
break;
|
|
default:
|
|
g_set_error (context->error,
|
|
GDK_PIXBUF_ERROR,
|
|
GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
|
|
_("PNM image loader does not support this PNM subformat"));
|
|
|
|
return PNM_FATAL_ERR;
|
|
}
|
|
|
|
return PNM_OK;
|
|
}
|
|
|
|
/* Shared library entry point */
|
|
static GdkPixbuf *
|
|
gdk_pixbuf__pnm_image_load (FILE *f, GError **error)
|
|
{
|
|
PnmLoaderContext context;
|
|
PnmIOBuffer *inbuf;
|
|
gint nbytes;
|
|
gint retval;
|
|
|
|
/* pretend to be doing progressive loading */
|
|
context.updated_func = NULL;
|
|
context.prepared_func = NULL;
|
|
context.user_data = NULL;
|
|
context.type = 0;
|
|
context.inbuf.nbytes = 0;
|
|
context.inbuf.byte = NULL;
|
|
context.width = 0;
|
|
context.height = 0;
|
|
context.maxval = 0;
|
|
context.pixels = NULL;
|
|
context.pixbuf = NULL;
|
|
context.got_header = FALSE;
|
|
context.did_prescan = FALSE;
|
|
context.scan_state = 0;
|
|
context.error = error;
|
|
|
|
inbuf = &context.inbuf;
|
|
|
|
while (TRUE) {
|
|
guint num_to_read;
|
|
|
|
/* keep buffer as full as possible */
|
|
num_to_read = PNM_BUF_SIZE - inbuf->nbytes;
|
|
|
|
if (inbuf->byte != NULL && inbuf->nbytes > 0)
|
|
memmove (inbuf->buffer, inbuf->byte, inbuf->nbytes);
|
|
|
|
nbytes = fread (inbuf->buffer + inbuf->nbytes, 1, num_to_read, f);
|
|
|
|
/* error checking */
|
|
if (nbytes == 0) {
|
|
/* we ran out of data? */
|
|
if (context.pixbuf)
|
|
g_object_unref (context.pixbuf);
|
|
g_set_error (error,
|
|
GDK_PIXBUF_ERROR,
|
|
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
|
_("Premature end-of-file encountered"));
|
|
return NULL;
|
|
}
|
|
|
|
inbuf->nbytes += nbytes;
|
|
inbuf->byte = inbuf->buffer;
|
|
|
|
/* get header if needed */
|
|
if (!context.got_header) {
|
|
retval = pnm_read_header (&context);
|
|
if (retval == PNM_FATAL_ERR)
|
|
return NULL;
|
|
else if (retval == PNM_SUSPEND)
|
|
continue;
|
|
|
|
context.got_header = TRUE;
|
|
}
|
|
|
|
/* scan until we hit image data */
|
|
if (!context.did_prescan) {
|
|
switch (context.type) {
|
|
case PNM_FORMAT_PBM_RAW:
|
|
case PNM_FORMAT_PGM_RAW:
|
|
case PNM_FORMAT_PPM_RAW:
|
|
if (inbuf->nbytes <= 0)
|
|
continue;
|
|
/* raw formats require exactly one whitespace */
|
|
if (!g_ascii_isspace(*(inbuf->byte)))
|
|
{
|
|
g_set_error (error,
|
|
GDK_PIXBUF_ERROR,
|
|
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
|
_("Raw PNM formats require exactly one whitespace before sample data"));
|
|
return NULL;
|
|
}
|
|
inbuf->nbytes--;
|
|
inbuf->byte++;
|
|
break;
|
|
default:
|
|
retval = pnm_skip_whitespace (inbuf,
|
|
context.error);
|
|
if (retval == PNM_FATAL_ERR)
|
|
return NULL;
|
|
else if (retval == PNM_SUSPEND)
|
|
continue;
|
|
break;
|
|
}
|
|
context.did_prescan = TRUE;
|
|
context.output_row = 0;
|
|
context.output_col = 0;
|
|
|
|
context.rowstride = context.width * 3;
|
|
context.pixels = g_try_malloc (context.height * context.width * 3);
|
|
|
|
if (!context.pixels) {
|
|
/* Failed to allocate memory */
|
|
g_set_error (error,
|
|
GDK_PIXBUF_ERROR,
|
|
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
|
|
_("Can't allocate memory for loading PNM image"));
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* if we got here we're reading image data */
|
|
while (context.output_row < context.height) {
|
|
retval = pnm_read_scanline (&context);
|
|
|
|
if (retval == PNM_SUSPEND) {
|
|
break;
|
|
} else if (retval == PNM_FATAL_ERR) {
|
|
if (context.pixbuf)
|
|
g_object_unref (context.pixbuf);
|
|
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
if (context.output_row < context.height)
|
|
continue;
|
|
else
|
|
break;
|
|
}
|
|
|
|
return gdk_pixbuf_new_from_data (context.pixels, GDK_COLORSPACE_RGB, FALSE, 8,
|
|
context.width, context.height,
|
|
context.width * 3, free_buffer, NULL);
|
|
|
|
}
|
|
|
|
/*
|
|
* func - called when we have pixmap created (but no image data)
|
|
* user_data - passed as arg 1 to func
|
|
* return context (opaque to user)
|
|
*/
|
|
|
|
static gpointer
|
|
gdk_pixbuf__pnm_image_begin_load (ModulePreparedNotifyFunc prepared_func,
|
|
ModuleUpdatedNotifyFunc updated_func,
|
|
gpointer user_data,
|
|
GError **error)
|
|
{
|
|
PnmLoaderContext *context;
|
|
|
|
context = g_try_malloc (sizeof (PnmLoaderContext));
|
|
if (!context) {
|
|
g_set_error(error, GDK_PIXBUF_ERROR,
|
|
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
|
|
_("Insufficient memory to load PNM context struct"));
|
|
return NULL;
|
|
}
|
|
memset (context, 0, sizeof (PnmLoaderContext));
|
|
context->prepared_func = prepared_func;
|
|
context->updated_func = updated_func;
|
|
context->user_data = user_data;
|
|
context->width = 0;
|
|
context->height = 0;
|
|
context->maxval = 0;
|
|
context->pixbuf = NULL;
|
|
context->pixels = NULL;
|
|
context->got_header = FALSE;
|
|
context->did_prescan = FALSE;
|
|
context->scan_state = 0;
|
|
|
|
context->inbuf.nbytes = 0;
|
|
context->inbuf.byte = NULL;
|
|
|
|
context->error = error;
|
|
|
|
return (gpointer) context;
|
|
}
|
|
|
|
/*
|
|
* context - returned from image_begin_load
|
|
*
|
|
* free context, unref gdk_pixbuf
|
|
*/
|
|
static gboolean
|
|
gdk_pixbuf__pnm_image_stop_load (gpointer data,
|
|
GError **error)
|
|
{
|
|
PnmLoaderContext *context = (PnmLoaderContext *) data;
|
|
gboolean retval = TRUE;
|
|
|
|
g_return_val_if_fail (context != NULL, TRUE);
|
|
|
|
if (context->pixbuf)
|
|
g_object_unref (context->pixbuf);
|
|
|
|
#if 0
|
|
/* We should ignore trailing newlines and we can't
|
|
generally complain about trailing stuff at all, since
|
|
pnm allows to put multiple images in a file
|
|
*/
|
|
if (context->inbuf.nbytes > 0) {
|
|
g_set_error (error,
|
|
GDK_PIXBUF_ERROR,
|
|
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
|
_("Unexpected end of PNM image data"));
|
|
retval = FALSE;
|
|
}
|
|
#endif
|
|
|
|
g_free (context);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* context - from image_begin_load
|
|
* buf - new image data
|
|
* size - length of new image data
|
|
*
|
|
* append image data onto inrecrementally built output image
|
|
*/
|
|
static gboolean
|
|
gdk_pixbuf__pnm_image_load_increment (gpointer data,
|
|
const guchar *buf, guint size,
|
|
GError **error)
|
|
{
|
|
PnmLoaderContext *context = (PnmLoaderContext *)data;
|
|
PnmIOBuffer *inbuf;
|
|
guchar *old_byte;
|
|
guint old_nbytes;
|
|
const guchar *bufhd;
|
|
guint num_left, spinguard;
|
|
gint retval;
|
|
|
|
g_return_val_if_fail (context != NULL, FALSE);
|
|
g_return_val_if_fail (buf != NULL, FALSE);
|
|
|
|
context->error = error;
|
|
|
|
bufhd = buf;
|
|
inbuf = &context->inbuf;
|
|
old_nbytes = inbuf->nbytes;
|
|
old_byte = inbuf->byte;
|
|
|
|
num_left = size;
|
|
spinguard = 0;
|
|
while (TRUE) {
|
|
guint num_to_copy;
|
|
|
|
/* keep buffer as full as possible */
|
|
num_to_copy = MIN (PNM_BUF_SIZE - inbuf->nbytes, num_left);
|
|
|
|
if (num_to_copy == 0)
|
|
spinguard++;
|
|
|
|
if (spinguard > 1)
|
|
return TRUE;
|
|
|
|
if (inbuf->byte != NULL && inbuf->nbytes > 0)
|
|
memmove (inbuf->buffer, inbuf->byte, inbuf->nbytes);
|
|
|
|
memcpy (inbuf->buffer + inbuf->nbytes, bufhd, num_to_copy);
|
|
bufhd += num_to_copy;
|
|
inbuf->nbytes += num_to_copy;
|
|
inbuf->byte = inbuf->buffer;
|
|
num_left -= num_to_copy;
|
|
|
|
/* ran out of data and we haven't exited main loop */
|
|
if (inbuf->nbytes == 0)
|
|
return TRUE;
|
|
|
|
/* get header if needed */
|
|
if (!context->got_header) {
|
|
retval = pnm_read_header (context);
|
|
|
|
if (retval == PNM_FATAL_ERR)
|
|
return FALSE;
|
|
else if (retval == PNM_SUSPEND)
|
|
continue;
|
|
|
|
context->got_header = TRUE;
|
|
}
|
|
|
|
/* scan until we hit image data */
|
|
if (!context->did_prescan) {
|
|
switch (context->type) {
|
|
case PNM_FORMAT_PBM_RAW:
|
|
case PNM_FORMAT_PGM_RAW:
|
|
case PNM_FORMAT_PPM_RAW:
|
|
if (inbuf->nbytes <= 0)
|
|
continue;
|
|
/* raw formats require exactly one whitespace */
|
|
if (!g_ascii_isspace(*(inbuf->byte)))
|
|
{
|
|
g_set_error (error,
|
|
GDK_PIXBUF_ERROR,
|
|
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
|
|
_("Raw PNM formats require exactly one whitespace before sample data"));
|
|
return FALSE;
|
|
}
|
|
inbuf->nbytes--;
|
|
inbuf->byte++;
|
|
break;
|
|
default:
|
|
retval = pnm_skip_whitespace (inbuf,
|
|
context->error);
|
|
if (retval == PNM_FATAL_ERR)
|
|
return FALSE;
|
|
else if (retval == PNM_SUSPEND)
|
|
continue;
|
|
break;
|
|
}
|
|
context->did_prescan = TRUE;
|
|
context->output_row = 0;
|
|
context->output_col = 0;
|
|
|
|
context->pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
|
|
FALSE,
|
|
8,
|
|
context->width,
|
|
context->height);
|
|
|
|
if (context->pixbuf == NULL) {
|
|
g_set_error (error,
|
|
GDK_PIXBUF_ERROR,
|
|
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
|
|
_("Insufficient memory to load PNM file"));
|
|
return FALSE;
|
|
}
|
|
|
|
context->pixels = context->pixbuf->pixels;
|
|
context->rowstride = context->pixbuf->rowstride;
|
|
|
|
/* Notify the client that we are ready to go */
|
|
(* context->prepared_func) (context->pixbuf,
|
|
NULL,
|
|
context->user_data);
|
|
}
|
|
|
|
/* if we got here we're reading image data */
|
|
while (context->output_row < context->height) {
|
|
retval = pnm_read_scanline (context);
|
|
|
|
if (retval == PNM_SUSPEND) {
|
|
break;
|
|
} else if (retval == PNM_FATAL_ERR) {
|
|
return FALSE;
|
|
} else if (retval == PNM_OK) {
|
|
/* send updated signal */
|
|
(* context->updated_func) (context->pixbuf,
|
|
0,
|
|
context->output_row-1,
|
|
context->width,
|
|
1,
|
|
context->user_data);
|
|
}
|
|
}
|
|
|
|
if (context->output_row < context->height)
|
|
continue;
|
|
else
|
|
break;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
void
|
|
gdk_pixbuf__pnm_fill_vtable (GdkPixbufModule *module)
|
|
{
|
|
module->load = gdk_pixbuf__pnm_image_load;
|
|
module->begin_load = gdk_pixbuf__pnm_image_begin_load;
|
|
module->stop_load = gdk_pixbuf__pnm_image_stop_load;
|
|
module->load_increment = gdk_pixbuf__pnm_image_load_increment;
|
|
}
|