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Signed-off-by: Derek Buitenhuis <[email protected]>
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‎COPYING

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Copyright (c) 2014, Derek Buitenhuis
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

‎Makefile

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OBJ = ijgdec.o \
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ijgenc.o \
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metric.o \
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api.o \
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main.o
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LIBOBJ = ijgdec.lo \
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ijgenc.lo \
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metric.lo \
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api.lo
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PREFIX=/usr/local
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CFLAGS=-Wall
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LDFLAGS=-s
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LIBS=-ljpeg -lm
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all: smallfry lib
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smallfry: $(OBJ)
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$(CC) -o $@ $^ $(LIBS)
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$(LIBOBJ):
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$(CC) -fPIC $(CFLAGS) -c $(@:.lo=.c) -o $@
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libsmallfry.so: $(LIBOBJ)
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$(CC) -Wl,--version-script,smallfry.ver -shared -o $@ $^ $(LIBS)
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lib: libsmallfry.so
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clean:
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@rm -vf ./*.o
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@rm -vf ./smallfry
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@rm -vf ./*.lo
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@rm -vf ./libsmallfry.so
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install: smallfry
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@cp -vf ./smallfry $(PREFIX)/bin/smallfry
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uninstall:
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@rm -vf $(PREFIX)/bin/smallfry

‎README.md

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## SmallFry ##
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SmallFry is a small proof-of-concept JPEG "optimizer" with a permissive license. What it does is try and find the most you can compress a JPEG without suffering obvious perceived quality loss. It works similarly to how [JPEGmini](http://www.jpegmini.com) works, with some borrowed metrics from their SPIE papers. If you want a nice GUI and easier batch automation, take a look at JPEGmini.
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**Background**
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I wrote this hack-of-a-program in early 2013, and largely ignored it since. Now that [mozjpeg](https://github.com/mozilla/mozjpeg) has gain some small mindshared, I thought it might be useful to others, since now it can take advantage of trellis quantization and scan optimization provided by it.
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**Usability**
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A small CLI util is provided, along with a (crappy) API and library. The code is just C89, and can be compiled with pretty much any compiler. Binaries are provided for Windows in the releases section.
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The code is very sub-optimal and slow. Pull requests are welcome. I am lazy.
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Currently only JPEG input is supported, but it is absolutely trivial to add other input via [ImageMagick](http://www.imagemagick.org) or [libavcodec](http://ffmpeg.org) (maybe via [FFMS2](https://github.com/FFMS/ffms2)). The current code is just what I had hacked together previously; it is not optimal.
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**Disclaimer**
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This code is entirely mine, and unrelated to my employer in any way, and is not used by my employer.
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Users of this code may want to look into any patents they may require to deploy it. I am not a lawyer.

‎api.c

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/*
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* Copyright (c) 2014, Derek Buitenhuis
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <errno.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "smallfry.h"
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#include "ijgdec.h"
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#include "ijgenc.h"
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#include "metric.h"
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void smallfryfreectx(smallfryctx **in)
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{
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smallfryctx *ctx = *in;
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if (!ctx)
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return;
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if (ctx->outbuf)
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free(ctx->outbuf);
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if (ctx->decinput)
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free(ctx->decinput);
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if (ctx->decoutput)
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free(ctx->decoutput);
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if (ctx->inplanar)
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free(ctx->inplanar);
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if (ctx->outplanar)
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free(ctx->outplanar);
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free(ctx);
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*in = NULL;
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}
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smallfryctx *smallfryallocctx(uint8_t *inbuf, uint64_t size)
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{
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smallfryctx *ret;
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int bufsize;
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ret = calloc(sizeof(smallfryctx), 1);
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if (!ret)
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goto allocfail;
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ret->inbuf = inbuf;
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ret->isize = size;
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ret->osize = 0;
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ret->res = jpeg_get_res(ret->inbuf, ret->isize);
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if (!ret->res.width)
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goto allocfail;
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bufsize = ret->res.width * ret->res.height * 3;
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ret->outbuf = malloc(bufsize);
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ret->decinput = malloc(bufsize);
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ret->decoutput = malloc(bufsize);
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ret->inplanar = malloc(bufsize / 3);
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ret->outplanar = malloc(bufsize / 3);
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if (!ret->outbuf || !ret->decinput || !ret->decoutput || !ret->inplanar || !ret->outplanar)
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goto allocfail;
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return ret;
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allocfail:
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smallfryfreectx(&ret);
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return NULL;
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}
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static void process_planar(uint8_t *interleaved, uint8_t *planar, jinfo res)
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{
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int i;
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int j = 0;
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uint8_t *out = planar;
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for (i = 0; i < res.width * res.height * 3; i += 3) {
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out[j] = interleaved[i];
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j++;
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}
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}
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int smallfryoptimize(smallfryctx *ctx)
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{
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const double threshold = 99.91 + 4.13 / 2;
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int ret;
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int qmin = 0, qmax = 100;
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double cur = threshold + 1;
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ret = jpeg_decode(ctx->inbuf, ctx->decinput, ctx->isize);
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if (ret < 0)
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return EINVAL;
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process_planar(ctx->decinput, ctx->inplanar, ctx->res);
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while (qmin <= qmax) {
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int size;
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int quality = (qmin + qmax) / 2;
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size = jpeg_encode(ctx->decinput, ctx->outbuf, ctx->res, quality);
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jpeg_decode(ctx->outbuf, ctx->decoutput, size);
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process_planar(ctx->decoutput, ctx->outplanar, ctx->res);
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cur = getmetric(ctx->inplanar, ctx->outplanar, ctx->res.width, ctx->res.height);
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if (cur < threshold)
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qmin = quality + 1;
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else
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qmax = quality - 1;
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}
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printf("Using quality = %d.\n", qmax + 1);
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ctx->osize = jpeg_encode(ctx->decinput, ctx->outbuf, ctx->res, qmax + 1);
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return 0;
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}
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uint64_t smallfrygetsize(smallfryctx *ctx)
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{
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return ctx->osize;
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}
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uint8_t *smallfrygetbuffer(smallfryctx *ctx)
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{
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return ctx->outbuf;
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}

‎build.bat

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@echo off
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cl /MT /GL /c /I. *.c
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link /LTCG /out:smallfry.exe *.obj jpeg-static.lib
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link /LTCG /dll /def:smallfry.def /out:smallfry.dll *.obj jpeg-static.lib

‎ijgdec.c

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/*
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* Copyright (c) 2014, Derek Buitenhuis
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <jerror.h>
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#include <jpeglib.h>
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#include "ijgdec.h"
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static const JOCTET EOI_BUFFER[1] = { JPEG_EOI };
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static void init(j_decompress_ptr cinfo)
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{
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}
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static boolean input(j_decompress_ptr cinfo)
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{
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cinfo->src->next_input_byte = EOI_BUFFER;
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cinfo->src->bytes_in_buffer = 1;
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return TRUE;
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}
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static void skip(j_decompress_ptr cinfo, long num_bytes)
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{
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if (cinfo->src->bytes_in_buffer < num_bytes) {
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cinfo->src->next_input_byte = EOI_BUFFER;
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cinfo->src->bytes_in_buffer = 1;
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} else {
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cinfo->src->next_input_byte += num_bytes;
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cinfo->src->bytes_in_buffer -= num_bytes;
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}
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}
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static void term(j_decompress_ptr cinfo)
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{
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}
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jinfo jpeg_get_res(uint8_t *inb, uint64_t insize)
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{
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struct jpeg_decompress_struct cinfo;
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struct jpeg_source_mgr s;
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struct jpeg_error_mgr jerr;
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jinfo ret;
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jpeg_create_decompress(&cinfo);
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cinfo.err = jpeg_std_error(&jerr);
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cinfo.src = &s;
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cinfo.src->init_source = init;
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cinfo.src->fill_input_buffer = input;
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cinfo.src->skip_input_data = skip;
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cinfo.src->resync_to_restart = jpeg_resync_to_restart;
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cinfo.src->term_source = term;
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cinfo.src->bytes_in_buffer = insize;
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cinfo.src->next_input_byte = (const JOCTET *) inb;
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jpeg_read_header(&cinfo, TRUE);
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jpeg_start_decompress(&cinfo);
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ret.width = cinfo.output_width;
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ret.height = cinfo.output_height;
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ret.vsamp = cinfo.comp_info[0].v_samp_factor;
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ret.hsamp = cinfo.comp_info[0].h_samp_factor;
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jpeg_destroy_decompress(&cinfo);
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return ret;
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}
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int jpeg_decode(uint8_t *inb, uint8_t *o, uint64_t insize)
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{
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JSAMPARRAY outb;
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struct jpeg_decompress_struct cinfo;
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struct jpeg_source_mgr s;
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struct jpeg_error_mgr jerr;
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jpeg_create_decompress(&cinfo);
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cinfo.err = jpeg_std_error(&jerr);
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cinfo.src = &s;
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cinfo.src->init_source = init;
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cinfo.src->fill_input_buffer = input;
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cinfo.src->skip_input_data = skip;
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cinfo.src->resync_to_restart = jpeg_resync_to_restart;
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cinfo.src->term_source = term;
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cinfo.src->bytes_in_buffer = insize;
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cinfo.src->next_input_byte = (const JOCTET *) inb;
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jpeg_read_header(&cinfo, TRUE);
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cinfo.out_color_space = JCS_YCbCr;
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jpeg_start_decompress(&cinfo);
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outb = (*cinfo.mem->alloc_sarray)((j_common_ptr) &cinfo, JPOOL_IMAGE,
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cinfo.output_width * cinfo.output_components, 1);
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if (!outb)
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return -1;
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while (cinfo.output_scanline < cinfo.output_height) {
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jpeg_read_scanlines(&cinfo, outb, 1);
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memcpy(o + cinfo.output_width * cinfo.output_components * (cinfo.output_scanline - 1),
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outb[0], cinfo.output_width * cinfo.output_components);
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}
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jpeg_finish_decompress(&cinfo);
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jpeg_destroy_decompress(&cinfo);
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return 0;
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}

‎ijgdec.h

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/*
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* Copyright (c) 2014, Derek Buitenhuis
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9+
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10+
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11+
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12+
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13+
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef IJGDEC_H
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#define IJGDEC_H
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typedef struct jinfo {
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int width;
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int height;
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int vsamp;
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int hsamp;
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} jinfo;
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jinfo jpeg_get_res(uint8_t *inb, uint64_t insize);
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int jpeg_decode(uint8_t *inb, uint8_t *o, uint64_t insize);
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#endif

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