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xviff.c
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xviff.c
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/*
* xviff.c - load routine for IFF ILBM format pictures
*
* LoadIFF(fname, pinfo) - loads an IFF file
*
*
* This loader module for xv will load most types of IFF ILBM pictures.
* Apart from any 'normal' ILBM format, this loader understands
* HAM (Hold-And-Modify), HAM8 (extended HAM), EHB (Extra Half Brite)
* and 24-Bit.
* Multipalette ILBMs are not supported yet, but I'll be working on that!
*
*
* History:
* 30-May-93: Project started
* ILBMs can now be loaded from xv
* EHB support added
* HAM support added
* 01-May-93: Started HAM8 support
* 04-Jun-93: HAM8 finally works! =:)
* 24 Bit support works!
*/
/* Copyright Notice
* ================
* Copyright 1993 by Thomas Meyer
*
* Author:
* Thomas Meyer
*
* Permission is hereby granted to use this code only as a part of
* the xv distribution by John Bradley.
*/
#include "xv.h"
static long filesize;
/* static int readID PARM((FILE *, char *)); DOES NOT EXIST */
static int iffError PARM((const char *, const char *));
static void decomprle PARM((byte *, byte *, long, long));
static unsigned int iff_getword PARM((byte *));
static unsigned long iff_getlong PARM((byte *));
static const char *bname;
/* Define internal ILBM types */
#define ILBM_NORMAL 0
#define ILBM_EHB 1
#define ILBM_HAM 2
#define ILBM_HAM8 3
#define ILBM_24BIT 4
/*******************************************/
int LoadIFF(fname, pinfo)
char *fname;
PICINFO *pinfo;
/*******************************************/
{
/* returns '1' on success */
register byte bitmsk, rval, gval, bval;
register long col, colbit;
FILE *fp;
int rv;
int BMHDok, CMAPok, CAMGok;
int bmhd_width, bmhd_height, bmhd_bitplanes, bmhd_transcol;
int i, j, k, lineskip, colors, fmt;
int npixels = 0; /* needs to be initialized _outside_ while-loop */
byte bmhd_masking, bmhd_compression;
long chunkLen, camg_viewmode;
byte *databuf, *dataptr, *cmapptr, *picptr, *pic, *bodyptr;
byte *workptr, *workptr2, *workptr3, *decomp_mem;
BMHDok = CAMGok = bmhd_width = bmhd_height = bmhd_bitplanes = colors = 0;
bmhd_compression = 0;
camg_viewmode = 0;
bname = BaseName(fname);
databuf = picptr = decomp_mem = NULL;
pinfo->pic = (byte *) NULL;
pinfo->comment = (char *) NULL;
/* open the file */
fp = xv_fopen(fname,"r");
if (!fp) return (iffError(bname, "cannot open file"));
/* compute file length */
fseek(fp, 0L, 2);
filesize = ftell(fp);
fseek(fp, 0L, 0);
/* allocate memory for complete file */
if((databuf = (byte *) malloc((size_t) filesize)) == NULL) {
fclose(fp);
FatalError("xviff: cannot malloc file buffer");
}
fread(databuf, (size_t) filesize, (size_t) 1, fp);
fclose(fp);
/* initialize work pointer. used to trace the buffer for IFF chunks */
dataptr = databuf;
/* check if we really got an IFF file */
if(strncmp((char *) dataptr, "FORM", (size_t) 4) != 0) {
free(databuf);
return(iffError(bname, "not an IFF file"));
}
dataptr = dataptr + 8; /* skip ID and length of FORM */
/* check if the IFF file is an ILBM (picture) file */
if(strncmp((char *) dataptr, "ILBM", (size_t) 4) != 0) {
free(databuf);
return(iffError(bname, "not an ILBM file"));
}
if (DEBUG) fprintf(stderr,"IFF ILBM file recognized\n");
dataptr = dataptr + 4; /* skip ID */
/* initialize return value to -1. used to indicate when we are finished with
decoding the picture (happens when BODY chunk was found */
rv = -1;
/* main decoding loop. searches IFF chunks and handles them. terminates when
BODY chunk was found or dataptr ran over end of file */
while ((rv<0) && (dataptr < (databuf + filesize))) {
chunkLen = (iff_getlong(dataptr + 4) + 1) & 0xfffffffe; /* make even */
if (strncmp((char *) dataptr, "BMHD", (size_t) 4)==0) { /* BMHD chunk? */
bmhd_width = iff_getword(dataptr + 8); /* width of picture */
bmhd_height = iff_getword(dataptr + 8 + 2); /* height of picture */
bmhd_bitplanes = *(dataptr + 8 + 8); /* # of bitplanes */
bmhd_masking = *(dataptr + 8 + 9);
bmhd_compression = *(dataptr + 8 + 10); /* get compression */
bmhd_transcol = iff_getword(dataptr + 8 + 12);
BMHDok = 1; /* got BMHD */
dataptr += 8 + chunkLen; /* to next chunk */
npixels = bmhd_width * bmhd_height; /* 65535*65535 max */
if (bmhd_width <= 0 || bmhd_height <= 0
|| npixels/bmhd_width != bmhd_height)
return (iffError(bname, "xviff: image dimensions out of range"));
}
else if (strncmp((char *) dataptr, "CMAP", (size_t) 4)==0) { /* CMAP ? */
cmapptr = dataptr + 8;
colors = chunkLen / 3; /* calc no of colors */
/* copy colors to color map */
for (i=0; i < colors; i++) {
pinfo->r[i] = *cmapptr++;
pinfo->g[i] = *cmapptr++;
pinfo->b[i] = *cmapptr++;
}
CMAPok = 1; /* got CMAP */
dataptr += 8 + chunkLen; /* to next chunk */
}
else if (strncmp((char *) dataptr, "CAMG", (size_t) 4)==0) { /* CAMG ? */
camg_viewmode = iff_getlong(dataptr + 8); /* get viewmodes */
CAMGok = 1; /* got CAMG */
dataptr += 8 + chunkLen; /* to next chunk */
}
else if (strncmp((char *) dataptr, "BODY", (size_t) 4)==0) { /* BODY ? */
int byte_width = (((bmhd_width + 15) >> 4) << 1); /* 8192 max */
bodyptr = dataptr + 8; /* -> BODY data */
if (BMHDok) { /* BMHD found? */
/* if BODY is compressed, allocate buffer for decrunched BODY and
decompress it (run length encoding) */
if (bmhd_compression == 1) {
/* calc size of decrunch buffer - (size of the actual picture
decompressed in interleaved Amiga bitplane format) */
int bytes_per_bitplane = byte_width * bmhd_height; /* 536862720 max */
long decomp_bufsize = bytes_per_bitplane * bmhd_bitplanes;
if (byte_width <= 0 || bmhd_height <= 0 ||
bytes_per_bitplane/byte_width != bmhd_height ||
decomp_bufsize/bytes_per_bitplane != bmhd_bitplanes)
{
return (iffError(bname, "xviff: image dimensions out of range"));
}
if ((decomp_mem = (byte *)malloc((size_t) decomp_bufsize)) != NULL) {
decomprle(dataptr + 8, decomp_mem, chunkLen, decomp_bufsize);
bodyptr = decomp_mem; /* -> uncompressed BODY */
free(databuf); /* free old data buffer */
databuf = NULL;
}
else {
free(databuf);
FatalError("xviff: cannot malloc() decrunch buffer");
}
}
/* the following determines the type of the ILBM file.
it's either NORMAL, EHB, HAM, HAM8 or 24BIT */
fmt = ILBM_NORMAL; /* assume normal ILBM */
/* FIXME: does ILBM_NORMAL really support up to 255 bitplanes? */
if (bmhd_bitplanes == 24) fmt = ILBM_24BIT;
else if (bmhd_bitplanes == 8) {
if (CAMGok && (camg_viewmode & 0x800)) fmt = ILBM_HAM8;
}
else if ((bmhd_bitplanes > 5) && CAMGok) {
if (camg_viewmode & 0x80) fmt = ILBM_EHB;
else if (camg_viewmode & 0x800) fmt = ILBM_HAM;
}
if (DEBUG) {
fprintf(stderr, "LoadIFF: %s %dx%d, planes=%d (%d cols), comp=%d\n",
(fmt==ILBM_NORMAL) ? "Normal ILBM" :
(fmt==ILBM_HAM) ? "HAM ILBM" :
(fmt==ILBM_HAM8) ? "HAM8 ILBM" :
(fmt==ILBM_EHB) ? "EHB ILBM" :
(fmt==ILBM_24BIT) ? "24BIT ILBM" : "unknown ILBM",
bmhd_width, bmhd_height, bmhd_bitplanes,
1<<bmhd_bitplanes, bmhd_compression);
}
if ((fmt==ILBM_NORMAL) || (fmt==ILBM_EHB) || (fmt==ILBM_HAM)) {
if (DEBUG) fprintf(stderr,"Converting CMAP from normal ILBM CMAP\n");
switch(fmt) {
case ILBM_NORMAL: colors = 1 << bmhd_bitplanes; break;
case ILBM_EHB: colors = 32; break;
case ILBM_HAM: colors = 16; break;
}
for (i=0; i < colors; i++) {
pinfo->r[i] = (pinfo->r[i] >> 4) * 17;
pinfo->g[i] = (pinfo->g[i] >> 4) * 17;
pinfo->b[i] = (pinfo->b[i] >> 4) * 17;
}
}
if ((fmt == ILBM_HAM) || (fmt == ILBM_HAM8) || (fmt == ILBM_24BIT)) {
int bufsize = 3 * npixels;
if (bufsize/3 != npixels) {
if (databuf) free(databuf);
if (decomp_mem) free(decomp_mem);
return (iffError(bname, "xviff: image dimensions out of range"));
}
if ((picptr=(byte *) malloc((size_t) bufsize)) == NULL) {
if (databuf) free(databuf);
if (decomp_mem) free(decomp_mem);
return (iffError(bname, "xviff: no memory for decoded picture"));
}
else {
pic = picptr;
workptr = bodyptr;
lineskip = byte_width;
for (i=0; i<bmhd_height; i++) {
bitmsk = 0x80;
workptr2 = workptr;
/* at start of each line, init RGB values to background */
rval = pinfo->r[0];
gval = pinfo->g[0];
bval = pinfo->b[0];
for (j=0; j<bmhd_width; j++) {
col = 0;
colbit = 1;
workptr3 = workptr2;
for (k=0; k<bmhd_bitplanes; k++) {
if (*workptr3 & bitmsk) col += colbit;
workptr3 += lineskip;
colbit <<= 1;
}
if (fmt==ILBM_HAM) {
switch (col & 0x30) {
case 0x00: rval = pinfo->r[col & 0x0f];
gval = pinfo->g[col & 0x0f];
bval = pinfo->b[col & 0x0f];
break;
case 0x10: bval = (col & 0x0f) * 17;
break;
case 0x20: rval = (col & 0x0f) * 17;
break;
case 0x30: gval = (col & 0x0f) * 17;
}
}
else if (fmt == ILBM_HAM8) {
switch(col & 0xc0) {
case 0x00: rval = pinfo->r[col & 0x3f];
gval = pinfo->g[col & 0x3f];
bval = pinfo->b[col & 0x3f];
break;
case 0x40: bval = (bval & 3) | ((col & 0x3f) << 2);
break;
case 0x80: rval = (rval & 3) | ((col & 0x3f) << 2);
break;
case 0xc0: gval = (rval & 3) | ((col & 0x3f) << 2);
}
}
else {
rval = col & 0xff;
gval = (col >> 8) & 0xff;
bval = (col >> 16) & 0xff;
}
*pic++ = rval;
*pic++ = gval;
*pic++ = bval;
bitmsk = bitmsk >> 1;
if (bitmsk == 0) {
bitmsk = 0x80;
workptr2++;
}
}
workptr += lineskip * bmhd_bitplanes;
}
pinfo->type = PIC24;
}
} /* HAM, HAM8, or 24BIT */
else if ((fmt == ILBM_NORMAL) || (fmt == ILBM_EHB)) {
/* if bmhd_width and bmhd_height are OK (checked in BMHD block
* above; guaranteed by BMHDok), then npixels is OK, too */
if ((picptr = (byte *) malloc((size_t) npixels)) == NULL) {
if (databuf) free(databuf);
if (decomp_mem) free(decomp_mem);
return (iffError(bname, "xviff: no memory for decoded picture"));
}
else if (fmt == ILBM_EHB) {
if (DEBUG) fprintf(stderr,"Doubling CMAP for EHB mode\n");
for (i=0; i<32; i++) {
pinfo->r[i + colors] = pinfo->r[i] >> 1;
pinfo->g[i + colors] = pinfo->g[i] >> 1;
pinfo->b[i + colors] = pinfo->b[i] >> 1;
}
}
pic = picptr; /* ptr to chunky buffer */
workptr = bodyptr; /* ptr to uncmp'd pic, planar format */
lineskip = byte_width;
for (i=0; i<bmhd_height; i++) {
bitmsk = 0x80; /* left most bit (mask) */
workptr2 = workptr; /* work ptr to source */
for (j=0; j<bmhd_width; j++) {
col = 0;
colbit = 1;
workptr3 = workptr2; /* ptr to byte in 1st pln */
for (k=0; k<bmhd_bitplanes; k++) {
if (*workptr3 & bitmsk) /* if bit set in this pln */
col = col + colbit; /* add bit to chunky byte */
workptr3 += lineskip; /* go to next line */
colbit <<= 1; /* shift color bit */
}
*pic++ = col; /* write to chunky buffer */
bitmsk = bitmsk >> 1; /* shift mask to next bit */
if (bitmsk == 0) { /* if mask is zero */
bitmsk = 0x80; /* reset mask */
workptr2++; /* mv ptr to next byte */
}
} /* for j ... */
workptr += lineskip * bmhd_bitplanes; /* to next line */
} /* for i ... */
pinfo->type = PIC8;
} /* if NORMAL or EHB */
/* fill up PICINFO */
pinfo->pic = picptr;
pinfo->w = bmhd_width;
pinfo->h = bmhd_height;
pinfo->normw = pinfo->w; pinfo->normh = pinfo->h;
pinfo->colType = F_FULLCOLOR;
pinfo->frmType = -1;
sprintf(pinfo->fullInfo, "%s (%ld bytes)",
(fmt==ILBM_NORMAL) ? "IFF ILBM" :
(fmt==ILBM_HAM) ? "HAM ILBM" :
(fmt==ILBM_HAM8) ? "HAM8 ILBM" :
(fmt==ILBM_EHB) ? "EHB ILBM" :
(fmt==ILBM_24BIT) ? "24BIT ILBM" : "unknown ILBM",
filesize);
sprintf(pinfo->shrtInfo, "%dx%d ILBM.", bmhd_width, bmhd_height);
rv = 1;
} /* if BMHDok */
else rv = 0; /* didn't get BMHD header */
} /* "BODY" chunk */
else {
if (DEBUG)
fprintf(stderr,"Skipping unknown chunk '%c%c%c%c'\n",
*dataptr, *(dataptr+1), *(dataptr+2), *(dataptr+3));
dataptr = dataptr + 8 + chunkLen; /* skip unknown chunk */
}
}
if (decomp_mem) free(decomp_mem);
if (databuf) free(databuf);
if (rv != 1) free(picptr);
return rv;
}
/**************************************************************************
void decomprle(source, destination, source length, buffer size)
Decompress run-length encoded data from source to destination. Terminates
when source is decoded completely or destination buffer is full.
The decruncher is as optimized as I could make it, without risking
safety in case of corrupt BODY chunks.
***************************************************************************/
/*******************************************/
static void decomprle(sptr, dptr, slen, dlen)
byte *sptr, *dptr;
register long slen, dlen;
{
register byte codeByte, dataByte;
while ((slen > 0) && (dlen > 0)) {
/* read control byte */
codeByte = *sptr++;
if (codeByte < 0x80) {
codeByte++;
if ((slen > (long) codeByte) && (dlen >= (long) codeByte)) {
slen -= codeByte + 1;
dlen -= codeByte;
while (codeByte > 0) {
*dptr++ = *sptr++;
codeByte--;
}
}
else slen = 0;
}
else if (codeByte > 0x80) {
codeByte = 0x81 - (codeByte & 0x7f);
if ((slen > (long) 0) && (dlen >= (long) codeByte)) {
dataByte = *sptr++;
slen -= 2;
dlen -= codeByte;
while (codeByte > 0) {
*dptr++ = dataByte;
codeByte--;
}
}
else slen = 0;
}
}
}
/*******************************************/
static unsigned int iff_getword(ptr)
byte *ptr;
{
register unsigned int v;
v = *ptr++;
v = (v << 8) + *ptr;
return v;
}
/*******************************************/
static unsigned long iff_getlong(ptr)
byte *ptr;
{
register unsigned long l;
l = *ptr++;
l = (l << 8) + *ptr++;
l = (l << 8) + *ptr++;
l = (l << 8) + *ptr;
return l;
}
/*******************************************/
static int iffError(fname, st)
const char *fname, *st;
{
SetISTR(ISTR_WARNING,"%s: %s", fname, st);
return 0;
}