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/*****************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// __ \_/ ___\| |/ /| __ \ / __ \ \/ /
* Jukebox | | ( (__) ) \___| ( | \_\ ( (__) ) (
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 Alexander Papst
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "plugin.h"
#include "lib/pluginlib_bmp.h"
#include "ppm_decoder.h"
#include "../imageviewer.h"
static int ppm_read_magic_number(int fd)
{
unsigned char i1, i2;
if(rb->read(fd, &i1, 1) < 1 || rb->read(fd, &i2, 1) < 1)
{
ppm_error( "Error reading magic number from ppm image stream. "\
"Most often, this means your input file is empty." );
return PLUGIN_ERROR;
}
return i1 * 256 + i2;
}
static int ppm_getc(int fd)
{
unsigned char ch;
if (rb->read(fd, &ch, 1) < 1) {
ppm_error("EOF. Read error reading a byte");
return PLUGIN_ERROR;
}
if (ch == '#') {
do {
if (rb->read(fd, &ch, 1) < 1) {
ppm_error("EOF. Read error reading a byte");
return PLUGIN_ERROR;
}
} while (ch != '\n' && ch != '\r');
}
return (int)ch;
}
static int ppm_getuint(int fd)
{
int ch;
int i;
int digitVal;
do {
ch = ppm_getc(fd);
} while (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r');
if (ch == PLUGIN_ERROR) return PLUGIN_ERROR;
if (ch < '0' || ch > '9') {
ppm_error("Junk (%c) in file where an integer should be.", ch);
return PLUGIN_ERROR;
}
i = 0;
do {
digitVal = ch - '0';
if (i > INT_MAX/10 - digitVal) {
ppm_error("ASCII decimal integer in file is "\
"too large to be processed.");
return PLUGIN_ERROR;
}
i = i * 10 + digitVal;
ch = ppm_getc(fd);
} while (ch >= '0' && ch <= '9');
if (ch == PLUGIN_ERROR) return PLUGIN_ERROR;
return i;
}
static int ppm_getrawbyte(int fd)
{
unsigned char by;
if (rb->read(fd, &by, 1) < 1) {
ppm_error("EOF. Read error while reading a one-byte sample.");
return PLUGIN_ERROR;
}
return (int)by;
}
static int ppm_getrawsample(int fd, int const maxval)
{
if (maxval < 256) {
/* The sample is just one byte. Read it. */
return(ppm_getrawbyte(fd));
} else {
/* The sample is two bytes. Read both. */
unsigned char byte_pair[2];
if (rb->read(fd, byte_pair, 2) < 2) {
ppm_error("EOF. Read error while reading a long sample.");
return PLUGIN_ERROR;
}
return((byte_pair[0]<<8) | byte_pair[1]);
}
}
/* Read from the file header dimensions as well as max
* int value used
*/
static int read_ppm_init_rest(int fd, struct ppm_info *ppm)
{
/* Read size. */
ppm->x = ppm_getuint(fd);
ppm->y = ppm_getuint(fd);
#ifdef HAVE_LCD_COLOR
ppm->native_img_size = ppm->x * ppm->y * FB_DATA_SZ;
#endif
if (ppm->native_img_size > ppm->buf_size) {
return PLUGIN_OUTOFMEM;
}
/* Read maxval. */
ppm->maxval = ppm_getuint(fd);
if (ppm->maxval > PPM_OVERALLMAXVAL) {
ppm_error("maxval of input image (%u) is too large. "\
"The maximum allowed by the PPM is %u.",
ppm->maxval, PPM_OVERALLMAXVAL);
return PLUGIN_ERROR;
}
if (ppm->maxval == 0) {
ppm_error("maxval of input image is zero.");
return PLUGIN_ERROR;
}
return PLUGIN_OK;
}
static int read_ppm_init(int fd, struct ppm_info *ppm)
{
/* Check magic number. */
ppm->format = ppm_read_magic_number( fd );
if (ppm->format == PLUGIN_ERROR) return PLUGIN_ERROR;
switch (ppm->format) {
case PPM_FORMAT:
case RPPM_FORMAT:
return read_ppm_init_rest(fd, ppm);
default:
ppm_error( "Bad magic number - not a ppm or rppm file." );
return PLUGIN_ERROR;
}
return PLUGIN_OK;
}
static int read_ppm_row(int fd, struct ppm_info *ppm, int row)
{
int col;
int r, g, b;
#ifdef HAVE_LCD_COLOR
#if defined(LCD_STRIDEFORMAT) && LCD_STRIDEFORMAT == VERTICAL_STRIDE
fb_data *dst = (fb_data *) ppm->buf + row;
const int stride = ppm->x;
#else
fb_data *dst = (fb_data *) ppm->buf + ppm->x*row;
const int stride = 1;
#endif
#endif /* HAVE_LCD_COLOR */
switch (ppm->format) {
case PPM_FORMAT:
for (col = 0; col < ppm->x; ++col) {
r = ppm_getuint(fd);
g = ppm_getuint(fd);
b = ppm_getuint(fd);
if (r == PLUGIN_ERROR || g == PLUGIN_ERROR ||
b == PLUGIN_ERROR)
{
return PLUGIN_ERROR;
}
*dst = FB_RGBPACK(
(255 * r)/ppm->maxval,
(255 * g)/ppm->maxval,
(255 * b)/ppm->maxval);
dst += stride;
}
break;
case RPPM_FORMAT:
for (col = 0; col < ppm->x; ++col) {
r = ppm_getrawsample(fd, ppm->maxval);
g = ppm_getrawsample(fd, ppm->maxval);
b = ppm_getrawsample(fd, ppm->maxval);
if (r == PLUGIN_ERROR || g == PLUGIN_ERROR ||
b == PLUGIN_ERROR)
{
return PLUGIN_ERROR;
}
*dst = FB_RGBPACK(
(255 * r)/ppm->maxval,
(255 * g)/ppm->maxval,
(255 * b)/ppm->maxval);
dst += stride;
}
break;
default:
ppm_error("What?!");
return PLUGIN_ERROR;
}
return PLUGIN_OK;
}
/* public */
int read_ppm(int fd, struct ppm_info *ppm)
{
int row, ret;
ret = read_ppm_init(fd, ppm);
if(ret != PLUGIN_OK) {
return ret;
}
for (row = 0; row < ppm->y; ++row) {
ret = read_ppm_row(fd, ppm, row);
if(ret != PLUGIN_OK) {
return ret;
}
iv->cb_progress(row, ppm->y);
}
return PLUGIN_OK;
}
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