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	Add ff2pam(1): convert farbfeld to 16-bit RGBA Portable Arbitrary Map - farbfel…
	git clone git://git.suckless.org/farbfeld
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	---
	commit 3d80d7237d18bdbf53e327a576b52b35b36af3ad
	parent e9db1f49b75b183c8aeda321ca54aff5b436a4f6
	Author: Mattias Andrée <[email protected]>
	Date: Mon, 9 Jan 2017 05:23:27 +0100

	Add ff2pam(1): convert farbfeld to 16-bit RGBA Portable Arbitrary Map

	Laslo: Minor changes

	Signed-off-by: Mattias Andrée <[email protected]>

	Diffstat:
	M Makefile \| 2 +-
	A ff2pam.1 \| 41 +++++++++++++++++++++++++++++…
	A ff2pam.c \| 74 +++++++++++++++++++++++++++++…

	3 files changed, 116 insertions(+), 1 deletion(-)
	---
	diff --git a/Makefile b/Makefile
	@@ -2,7 +2,7 @@
	# See LICENSE file for copyright and license details
	include config.mk

	-BIN = png2ff ff2png jpg2ff ff2jpg ff2ppm
	+BIN = png2ff ff2png jpg2ff ff2jpg ff2pam ff2ppm
	SCRIPTS = 2ff
	SRC = ${BIN:=.c}
	HDR = arg.h
	diff --git a/ff2pam.1 b/ff2pam.1
	@@ -0,0 +1,41 @@
	+.Dd 2017-01-09
	+.Dt FF2PAM 1
	+.Os suckless.org
	+.Sh NAME
	+.Nm ff2pam
	+.Nd convert farbfeld to PAM
	+.Sh SYNOPSIS
	+.Nm
	+.Sh DESCRIPTION
	+.Nm
	+reads a
	+.Xr farbfeld 5
	+image from stdin, converts it to a 16-bit RGBA PAM and writes the result
	+to stdout.
	+.Pp
	+In case of an error
	+.Nm
	+writes a diagnostic message to stderr.
	+.Sh EXIT STATUS
	+.Bl -tag -width Ds
	+.It 0
	+Image processed successfully.
	+.It 1
	+An error occurred.
	+.El
	+.Sh EXAMPLES
	+$
	+.Nm
	+< image.ff > image.pam
	+.Pp
	+$ bunzip2 < image.ff.bz2 \|
	+.Nm
	+> image.pam
	+.Sh SEE ALSO
	+.Xr 2ff 1 ,
	+.Xr bunzip2 1 ,
	+.Xr bzip2 1 ,
	+.Xr png2ff 1 ,
	+.Xr farbfeld 5
	+.Sh AUTHORS
	+.An Mattias Andrée Aq Mt [email protected]
	diff --git a/ff2pam.c b/ff2pam.c
	@@ -0,0 +1,74 @@
	+/* See LICENSE file for copyright and license details. */
	+#include <arpa/inet.h>
	+
	+#include <errno.h>
	+#include <inttypes.h>
	+#include <stdint.h>
	+#include <stdio.h>
	+#include <string.h>
	+#include <unistd.h>
	+
	+static char *argv0;
	+
	+int
	+main(int argc, char *argv[])
	+{
	+ uint32_t hdr[4], width, height;
	+ char buf[BUFSIZ];
	+ size_t n, t;
	+
	+ argv0 = argv[0], argc--, argv++;
	+
	+ if (argc) {
	+ fprintf(stderr, "usage: %s\n", argv0);
	+ return 1;
	+ }
	+
	+ /* header */
	+ if (fread(hdr, sizeof(*hdr), 4, stdin) != 4) {
	+ fprintf(stderr, "%s: file too short\n", argv0);
	+ return 1;
	+ }
	+ if (memcmp("farbfeld", hdr, sizeof("farbfeld") - 1)) {
	+ fprintf(stderr, "%s: invalid magic value\n", argv0);
	+ return 1;
	+ }
	+ width = ntohl(hdr[2]);
	+ height = ntohl(hdr[3]);
	+
	+ /* write header */
	+ printf("P7\n"
	+ "WIDTH %" PRIu32 "\n"
	+ "HEIGHT %" PRIu32 "\n"
	+ "DEPTH 4\n" /* number of channels */
	+ "MAXVAL 65535\n"
	+ "TUPLTYPE RGB_ALPHA\n"
	+ "ENDHDR\n",
	+ width, height);
	+
	+ /* write image */
	+ t = (size_t)width * (size_t)height * sizeof(uint16_t) * (sizeof("RGBA"…
	+ for (; (n = fread(buf, 1, sizeof(buf) <= t ? sizeof(buf) : t, stdin));…
	+ t -= n;
	+ fwrite(buf, 1, n, stdout);
	+
	+ if (feof(stdin)) {
	+ break;
	+ }
	+ if (ferror(stdin)) {
	+ fprintf(stderr, "%s: read: %s\n", argv0, strerror(errn…
	+ return 1;
	+ }
	+ if (ferror(stdout)) {
	+ fprintf(stderr, "%s: write: %s\n", argv0, strerror(err…
	+ return 1;
	+ }
	+ }
	+
	+ if (t > 0) {
	+ fprintf(stderr, "%s: file too short\n", argv0);
	+ return 1;
	+ }
	+
	+ return 0;
	+}