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Pillow/decode.c

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/*
* The Python Imaging Library.
*
* standard decoder interfaces for the Imaging library
*
* history:
* 1996-03-28 fl Moved from _imagingmodule.c
* 1996-04-15 fl Support subregions in setimage
* 1996-04-19 fl Allocate decoder buffer (where appropriate)
* 1996-05-02 fl Added jpeg decoder
* 1996-05-12 fl Compile cleanly as C++
* 1996-05-16 fl Added hex decoder
* 1996-05-26 fl Added jpeg configuration parameters
* 1996-12-14 fl Added zip decoder
* 1996-12-30 fl Plugged potential memory leak for tiled images
* 1997-01-03 fl Added fli and msp decoders
* 1997-01-04 fl Added sun_rle and tga_rle decoders
* 1997-05-31 fl Added bitfield decoder
* 1998-09-11 fl Added orientation and pixelsize fields to tga_rle decoder
* 1998-12-29 fl Added mode/rawmode argument to decoders
* 1998-12-30 fl Added mode argument to *all* decoders
* 2002-06-09 fl Added stride argument to pcx decoder
*
* Copyright (c) 1997-2002 by Secret Labs AB.
* Copyright (c) 1995-2002 by Fredrik Lundh.
*
* See the README file for information on usage and redistribution.
*/
/* FIXME: make these pluggable! */
#include "Python.h"
#include "Imaging.h"
#include "py3.h"
#include "Gif.h"
#include "Lzw.h"
#include "Raw.h"
#include "Bit.h"
/* -------------------------------------------------------------------- */
/* Common */
/* -------------------------------------------------------------------- */
typedef struct {
PyObject_HEAD
int (*decode)(Imaging im, ImagingCodecState state,
UINT8* buffer, int bytes);
int (*cleanup)(ImagingCodecState state);
struct ImagingCodecStateInstance state;
Imaging im;
PyObject* lock;
int pulls_fd;
} ImagingDecoderObject;
static PyTypeObject ImagingDecoderType;
static ImagingDecoderObject*
PyImaging_DecoderNew(int contextsize)
{
ImagingDecoderObject *decoder;
void *context;
if(PyType_Ready(&ImagingDecoderType) < 0)
return NULL;
decoder = PyObject_New(ImagingDecoderObject, &ImagingDecoderType);
if (decoder == NULL)
return NULL;
/* Clear the decoder state */
memset(&decoder->state, 0, sizeof(decoder->state));
/* Allocate decoder context */
if (contextsize > 0) {
context = (void*) calloc(1, contextsize);
if (!context) {
Py_DECREF(decoder);
(void) PyErr_NoMemory();
return NULL;
}
} else
context = 0;
/* Initialize decoder context */
decoder->state.context = context;
/* Target image */
decoder->lock = NULL;
decoder->im = NULL;
/* Initialize the cleanup function pointer */
decoder->cleanup = NULL;
/* set if the decoder needs to pull data from the fd, instead of
having it pushed */
decoder->pulls_fd = 0;
return decoder;
}
static void
_dealloc(ImagingDecoderObject* decoder)
{
if (decoder->cleanup)
decoder->cleanup(&decoder->state);
free(decoder->state.buffer);
free(decoder->state.context);
Py_XDECREF(decoder->lock);
Py_XDECREF(decoder->state.fd);
PyObject_Del(decoder);
}
static PyObject*
_decode(ImagingDecoderObject* decoder, PyObject* args)
{
UINT8* buffer;
int bufsize, status;
ImagingSectionCookie cookie;
if (!PyArg_ParseTuple(args, PY_ARG_BYTES_LENGTH, &buffer, &bufsize))
return NULL;
if (!decoder->pulls_fd) {
ImagingSectionEnter(&cookie);
}
status = decoder->decode(decoder->im, &decoder->state, buffer, bufsize);
if (!decoder->pulls_fd) {
ImagingSectionLeave(&cookie);
}
return Py_BuildValue("ii", status, decoder->state.errcode);
}
static PyObject*
_decode_cleanup(ImagingDecoderObject* decoder, PyObject* args)
{
int status = 0;
if (decoder->cleanup){
status = decoder->cleanup(&decoder->state);
}
return Py_BuildValue("i", status);
}
extern Imaging PyImaging_AsImaging(PyObject *op);
static PyObject*
_setimage(ImagingDecoderObject* decoder, PyObject* args)
{
PyObject* op;
Imaging im;
ImagingCodecState state;
int x0, y0, x1, y1;
x0 = y0 = x1 = y1 = 0;
/* FIXME: should publish the ImagingType descriptor */
if (!PyArg_ParseTuple(args, "O|(iiii)", &op, &x0, &y0, &x1, &y1))
return NULL;
im = PyImaging_AsImaging(op);
if (!im)
return NULL;
decoder->im = im;
state = &decoder->state;
/* Setup decoding tile extent */
if (x0 == 0 && x1 == 0) {
state->xsize = im->xsize;
state->ysize = im->ysize;
} else {
state->xoff = x0;
state->yoff = y0;
state->xsize = x1 - x0;
state->ysize = y1 - y0;
}
if (state->xsize <= 0 ||
state->xsize + state->xoff > (int) im->xsize ||
state->ysize <= 0 ||
state->ysize + state->yoff > (int) im->ysize) {
PyErr_SetString(PyExc_ValueError, "tile cannot extend outside image");
return NULL;
}
/* Allocate memory buffer (if bits field is set) */
if (state->bits > 0) {
if (!state->bytes) {
if (state->xsize > ((INT_MAX / state->bits)-7)){
return PyErr_NoMemory();
}
state->bytes = (state->bits * state->xsize+7)/8;
}
/* malloc check ok, overflow checked above */
state->buffer = (UINT8*) malloc(state->bytes);
if (!state->buffer)
return PyErr_NoMemory();
}
/* Keep a reference to the image object, to make sure it doesn't
go away before we do */
Py_INCREF(op);
Py_XDECREF(decoder->lock);
decoder->lock = op;
Py_INCREF(Py_None);
return Py_None;
}
static PyObject*
_setfd(ImagingDecoderObject* decoder, PyObject* args)
{
PyObject* fd;
ImagingCodecState state;
if (!PyArg_ParseTuple(args, "O", &fd))
return NULL;
state = &decoder->state;
Py_XINCREF(fd);
state->fd = fd;
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
_get_pulls_fd(ImagingDecoderObject *decoder)
{
return PyBool_FromLong(decoder->pulls_fd);
}
static struct PyMethodDef methods[] = {
{"decode", (PyCFunction)_decode, 1},
{"cleanup", (PyCFunction)_decode_cleanup, 1},
{"setimage", (PyCFunction)_setimage, 1},
{"setfd", (PyCFunction)_setfd, 1},
{NULL, NULL} /* sentinel */
};
static struct PyGetSetDef getseters[] = {
{"pulls_fd", (getter)_get_pulls_fd, NULL,
"True if this decoder expects to pull from self.fd itself.",
NULL},
{NULL, NULL, NULL, NULL, NULL} /* sentinel */
};
static PyTypeObject ImagingDecoderType = {
PyVarObject_HEAD_INIT(NULL, 0)
"ImagingDecoder", /*tp_name*/
sizeof(ImagingDecoderObject), /*tp_size*/
0, /*tp_itemsize*/
/* methods */
(destructor)_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number */
0, /*tp_as_sequence */
0, /*tp_as_mapping */
0, /*tp_hash*/
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT, /*tp_flags*/
0, /*tp_doc*/
0, /*tp_traverse*/
0, /*tp_clear*/
0, /*tp_richcompare*/
0, /*tp_weaklistoffset*/
0, /*tp_iter*/
0, /*tp_iternext*/
methods, /*tp_methods*/
0, /*tp_members*/
getseters, /*tp_getset*/
};
/* -------------------------------------------------------------------- */
int
get_unpacker(ImagingDecoderObject* decoder, const char* mode,
const char* rawmode)
{
int bits;
ImagingShuffler unpack;
unpack = ImagingFindUnpacker(mode, rawmode, &bits);
if (!unpack) {
Py_DECREF(decoder);
PyErr_SetString(PyExc_ValueError, "unknown raw mode");
return -1;
}
decoder->state.shuffle = unpack;
decoder->state.bits = bits;
return 0;
}
/* -------------------------------------------------------------------- */
/* BIT (packed fields) */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_BitDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
char* mode;
int bits = 8;
int pad = 8;
int fill = 0;
int sign = 0;
int ystep = 1;
if (!PyArg_ParseTuple(args, "s|iiiii", &mode, &bits, &pad, &fill,
&sign, &ystep))
return NULL;
if (strcmp(mode, "F") != 0) {
PyErr_SetString(PyExc_ValueError, "bad image mode");
return NULL;
}
decoder = PyImaging_DecoderNew(sizeof(BITSTATE));
if (decoder == NULL)
return NULL;
decoder->decode = ImagingBitDecode;
decoder->state.ystep = ystep;
((BITSTATE*)decoder->state.context)->bits = bits;
((BITSTATE*)decoder->state.context)->pad = pad;
((BITSTATE*)decoder->state.context)->fill = fill;
((BITSTATE*)decoder->state.context)->sign = sign;
return (PyObject*) decoder;
}
/* -------------------------------------------------------------------- */
/* BCn: GPU block-compressed texture formats */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_BcnDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
char* mode;
char* actual;
int n = 0;
int ystep = 1;
if (!PyArg_ParseTuple(args, "s|ii", &mode, &n, &ystep))
return NULL;
switch (n) {
case 1: /* BC1: 565 color, 1-bit alpha */
case 2: /* BC2: 565 color, 4-bit alpha */
case 3: /* BC3: 565 color, 2-endpoint 8-bit interpolated alpha */
case 5: /* BC5: 2-channel 8-bit via 2 BC3 alpha blocks */
case 7: /* BC7: 4-channel 8-bit via everything */
actual = "RGBA"; break;
case 4: /* BC4: 1-channel 8-bit via 1 BC3 alpha block */
actual = "L"; break;
case 6: /* BC6: 3-channel 16-bit float */
/* TODO: support 4-channel floating point images */
actual = "RGBAF"; break;
default:
PyErr_SetString(PyExc_ValueError, "block compression type unknown");
return NULL;
}
if (strcmp(mode, actual) != 0) {
PyErr_SetString(PyExc_ValueError, "bad image mode");
return NULL;
}
decoder = PyImaging_DecoderNew(0);
if (decoder == NULL)
return NULL;
decoder->decode = ImagingBcnDecode;
decoder->state.state = n;
decoder->state.ystep = ystep;
return (PyObject*) decoder;
}
/* -------------------------------------------------------------------- */
/* FLI */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_FliDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
decoder = PyImaging_DecoderNew(0);
if (decoder == NULL)
return NULL;
decoder->decode = ImagingFliDecode;
return (PyObject*) decoder;
}
/* -------------------------------------------------------------------- */
/* GIF */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_GifDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
char* mode;
int bits = 8;
int interlace = 0;
if (!PyArg_ParseTuple(args, "s|ii", &mode, &bits, &interlace))
return NULL;
if (strcmp(mode, "L") != 0 && strcmp(mode, "P") != 0) {
PyErr_SetString(PyExc_ValueError, "bad image mode");
return NULL;
}
decoder = PyImaging_DecoderNew(sizeof(GIFDECODERSTATE));
if (decoder == NULL)
return NULL;
decoder->decode = ImagingGifDecode;
((GIFDECODERSTATE*)decoder->state.context)->bits = bits;
((GIFDECODERSTATE*)decoder->state.context)->interlace = interlace;
return (PyObject*) decoder;
}
/* -------------------------------------------------------------------- */
/* HEX */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_HexDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
char* mode;
char* rawmode;
if (!PyArg_ParseTuple(args, "ss", &mode, &rawmode))
return NULL;
decoder = PyImaging_DecoderNew(0);
if (decoder == NULL)
return NULL;
if (get_unpacker(decoder, mode, rawmode) < 0)
return NULL;
decoder->decode = ImagingHexDecode;
return (PyObject*) decoder;
}
/* -------------------------------------------------------------------- */
/* LZW */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_TiffLzwDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
char* mode;
char* rawmode;
int filter = 0;
if (!PyArg_ParseTuple(args, "ss|i", &mode, &rawmode, &filter))
return NULL;
decoder = PyImaging_DecoderNew(sizeof(LZWSTATE));
if (decoder == NULL)
return NULL;
if (get_unpacker(decoder, mode, rawmode) < 0)
return NULL;
decoder->decode = ImagingLzwDecode;
((LZWSTATE*)decoder->state.context)->filter = filter;
return (PyObject*) decoder;
}
/* -------------------------------------------------------------------- */
/* LibTiff */
/* -------------------------------------------------------------------- */
#ifdef HAVE_LIBTIFF
#include "TiffDecode.h"
#include <string.h>
PyObject*
PyImaging_LibTiffDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
char* mode;
char* rawmode;
char* compname;
int fp;
int ifdoffset;
if (! PyArg_ParseTuple(args, "sssii", &mode, &rawmode, &compname, &fp, &ifdoffset))
return NULL;
TRACE(("new tiff decoder %s\n", compname));
decoder = PyImaging_DecoderNew(sizeof(TIFFSTATE));
if (decoder == NULL)
return NULL;
if (get_unpacker(decoder, mode, rawmode) < 0)
return NULL;
if (! ImagingLibTiffInit(&decoder->state, fp, ifdoffset)) {
Py_DECREF(decoder);
PyErr_SetString(PyExc_RuntimeError, "tiff codec initialization failed");
return NULL;
}
decoder->decode = ImagingLibTiffDecode;
return (PyObject*) decoder;
}
#endif
/* -------------------------------------------------------------------- */
/* MSP */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_MspDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
decoder = PyImaging_DecoderNew(0);
if (decoder == NULL)
return NULL;
if (get_unpacker(decoder, "1", "1") < 0)
return NULL;
decoder->decode = ImagingMspDecode;
return (PyObject*) decoder;
}
/* -------------------------------------------------------------------- */
/* PackBits */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_PackbitsDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
char* mode;
char* rawmode;
if (!PyArg_ParseTuple(args, "ss", &mode, &rawmode))
return NULL;
decoder = PyImaging_DecoderNew(0);
if (decoder == NULL)
return NULL;
if (get_unpacker(decoder, mode, rawmode) < 0)
return NULL;
decoder->decode = ImagingPackbitsDecode;
return (PyObject*) decoder;
}
/* -------------------------------------------------------------------- */
/* PCD */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_PcdDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
decoder = PyImaging_DecoderNew(0);
if (decoder == NULL)
return NULL;
/* Unpack from PhotoYCC to RGB */
if (get_unpacker(decoder, "RGB", "YCC;P") < 0)
return NULL;
decoder->decode = ImagingPcdDecode;
return (PyObject*) decoder;
}
/* -------------------------------------------------------------------- */
/* PCX */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_PcxDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
char* mode;
char* rawmode;
int stride;
if (!PyArg_ParseTuple(args, "ssi", &mode, &rawmode, &stride))
return NULL;
decoder = PyImaging_DecoderNew(0);
if (decoder == NULL)
return NULL;
if (get_unpacker(decoder, mode, rawmode) < 0)
return NULL;
decoder->state.bytes = stride;
decoder->decode = ImagingPcxDecode;
return (PyObject*) decoder;
}
/* -------------------------------------------------------------------- */
/* RAW */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_RawDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
char* mode;
char* rawmode;
int stride = 0;
int ystep = 1;
if (!PyArg_ParseTuple(args, "ss|ii", &mode, &rawmode, &stride, &ystep))
return NULL;
decoder = PyImaging_DecoderNew(sizeof(RAWSTATE));
if (decoder == NULL)
return NULL;
if (get_unpacker(decoder, mode, rawmode) < 0)
return NULL;
decoder->decode = ImagingRawDecode;
decoder->state.ystep = ystep;
((RAWSTATE*)decoder->state.context)->stride = stride;
return (PyObject*) decoder;
}
/* -------------------------------------------------------------------- */
/* SUN RLE */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_SunRleDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
char* mode;
char* rawmode;
if (!PyArg_ParseTuple(args, "ss", &mode, &rawmode))
return NULL;
decoder = PyImaging_DecoderNew(0);
if (decoder == NULL)
return NULL;
if (get_unpacker(decoder, mode, rawmode) < 0)
return NULL;
decoder->decode = ImagingSunRleDecode;
return (PyObject*) decoder;
}
/* -------------------------------------------------------------------- */
/* TGA RLE */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_TgaRleDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
char* mode;
char* rawmode;
int ystep = 1;
int depth = 8;
if (!PyArg_ParseTuple(args, "ss|ii", &mode, &rawmode, &ystep, &depth))
return NULL;
decoder = PyImaging_DecoderNew(0);
if (decoder == NULL)
return NULL;
if (get_unpacker(decoder, mode, rawmode) < 0)
return NULL;
decoder->decode = ImagingTgaRleDecode;
decoder->state.ystep = ystep;
decoder->state.count = depth / 8;
return (PyObject*) decoder;
}
/* -------------------------------------------------------------------- */
/* XBM */
/* -------------------------------------------------------------------- */
PyObject*
PyImaging_XbmDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
decoder = PyImaging_DecoderNew(0);
if (decoder == NULL)
return NULL;
if (get_unpacker(decoder, "1", "1;R") < 0)
return NULL;
decoder->decode = ImagingXbmDecode;
return (PyObject*) decoder;
}
/* -------------------------------------------------------------------- */
/* ZIP */
/* -------------------------------------------------------------------- */
#ifdef HAVE_LIBZ
#include "Zip.h"
PyObject*
PyImaging_ZipDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
char* mode;
char* rawmode;
int interlaced = 0;
if (!PyArg_ParseTuple(args, "ss|i", &mode, &rawmode, &interlaced))
return NULL;
decoder = PyImaging_DecoderNew(sizeof(ZIPSTATE));
if (decoder == NULL)
return NULL;
if (get_unpacker(decoder, mode, rawmode) < 0)
return NULL;
decoder->decode = ImagingZipDecode;
((ZIPSTATE*)decoder->state.context)->interlaced = interlaced;
return (PyObject*) decoder;
}
#endif
/* -------------------------------------------------------------------- */
/* JPEG */
/* -------------------------------------------------------------------- */
#ifdef HAVE_LIBJPEG
/* We better define this decoder last in this file, so the following
undef's won't mess things up for the Imaging library proper. */
#undef HAVE_PROTOTYPES
#undef HAVE_STDDEF_H
#undef HAVE_STDLIB_H
#undef UINT8
#undef UINT16
#undef UINT32
#undef INT8
#undef INT16
#undef INT32
#include "Jpeg.h"
PyObject*
PyImaging_JpegDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
char* mode;
char* rawmode; /* what we want from the decoder */
char* jpegmode; /* what's in the file */
int scale = 1;
int draft = 0;
if (!PyArg_ParseTuple(args, "ssz|ii", &mode, &rawmode, &jpegmode,
&scale, &draft))
return NULL;
if (!jpegmode)
jpegmode = "";
decoder = PyImaging_DecoderNew(sizeof(JPEGSTATE));
if (decoder == NULL)
return NULL;
if (get_unpacker(decoder, mode, rawmode) < 0)
return NULL;
decoder->decode = ImagingJpegDecode;
decoder->cleanup = ImagingJpegDecodeCleanup;
strncpy(((JPEGSTATE*)decoder->state.context)->rawmode, rawmode, 8);
strncpy(((JPEGSTATE*)decoder->state.context)->jpegmode, jpegmode, 8);
((JPEGSTATE*)decoder->state.context)->scale = scale;
((JPEGSTATE*)decoder->state.context)->draft = draft;
return (PyObject*) decoder;
}
#endif
/* -------------------------------------------------------------------- */
/* JPEG 2000 */
/* -------------------------------------------------------------------- */
#ifdef HAVE_OPENJPEG
#include "Jpeg2K.h"
PyObject*
PyImaging_Jpeg2KDecoderNew(PyObject* self, PyObject* args)
{
ImagingDecoderObject* decoder;
JPEG2KDECODESTATE *context;
char* mode;
char* format;
OPJ_CODEC_FORMAT codec_format;
int reduce = 0;
int layers = 0;
int fd = -1;
PY_LONG_LONG length = -1;
if (!PyArg_ParseTuple(args, "ss|iiiL", &mode, &format,
&reduce, &layers, &fd, &length))
return NULL;
if (strcmp(format, "j2k") == 0)
codec_format = OPJ_CODEC_J2K;
else if (strcmp(format, "jpt") == 0)
codec_format = OPJ_CODEC_JPT;
else if (strcmp(format, "jp2") == 0)
codec_format = OPJ_CODEC_JP2;
else
return NULL;
decoder = PyImaging_DecoderNew(sizeof(JPEG2KDECODESTATE));
if (decoder == NULL)
return NULL;
decoder->pulls_fd = 1;
decoder->decode = ImagingJpeg2KDecode;
decoder->cleanup = ImagingJpeg2KDecodeCleanup;
context = (JPEG2KDECODESTATE *)decoder->state.context;
context->fd = fd;
context->length = (off_t)length;
context->format = codec_format;
context->reduce = reduce;
context->layers = layers;
return (PyObject*) decoder;
}
#endif /* HAVE_OPENJPEG */
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