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-rw-r--r--xps/xpstiff.c1091
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diff --git a/xps/xpstiff.c b/xps/xpstiff.c
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+/* Copyright (C) 2006-2010 Artifex Software, Inc.
+ All Rights Reserved.
+
+ This software is provided AS-IS with no warranty, either express or
+ implied.
+
+ This software is distributed under license and may not be copied, modified
+ or distributed except as expressly authorized under the terms of that
+ license. Refer to licensing information at http://www.artifex.com/
+ or contact Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134,
+ San Rafael, CA 94903, U.S.A., +1(415)492-9861, for further information.
+*/
+
+/* XPS interpreter - TIFF image support */
+
+#include "ghostxps.h"
+
+#include "stream.h"
+#include "strimpl.h"
+#include "gsstate.h"
+#include "jpeglib_.h"
+#include "sdct.h"
+#include "sjpeg.h"
+#include "srlx.h"
+#include "slzwx.h"
+#include "szlibx.h"
+#include "scfx.h"
+#include "memory_.h"
+
+/*
+ * TIFF image loader. Should be enough to support TIFF files in XPS.
+ * Baseline TIFF 6.0 plus CMYK, LZW, Flate and JPEG support.
+ * Limited bit depths (1,2,4,8).
+ * Limited planar configurations (1=chunky).
+ * No tiles (easy fix if necessary).
+ * TODO: RGBPal images
+ */
+
+typedef struct xps_tiff_s xps_tiff_t;
+
+struct xps_tiff_s
+{
+ /* "file" */
+ byte *bp, *rp, *ep;
+
+ /* byte order */
+ unsigned order;
+
+ /* where we can find the strips of image data */
+ unsigned rowsperstrip;
+ unsigned *stripoffsets;
+ unsigned *stripbytecounts;
+
+ /* colormap */
+ unsigned *colormap;
+
+ /* assorted tags */
+ unsigned subfiletype;
+ unsigned photometric;
+ unsigned compression;
+ unsigned imagewidth;
+ unsigned imagelength;
+ unsigned samplesperpixel;
+ unsigned bitspersample;
+ unsigned planar;
+ unsigned extrasamples;
+ unsigned xresolution;
+ unsigned yresolution;
+ unsigned resolutionunit;
+ unsigned fillorder;
+ unsigned g3opts;
+ unsigned g4opts;
+ unsigned predictor;
+
+ unsigned ycbcrsubsamp[2];
+
+ byte *jpegtables; /* point into "file" buffer */
+ unsigned jpegtableslen;
+
+ byte *profile;
+ int profilesize;
+};
+
+enum
+{
+ TII = 0x4949, /* 'II' */
+ TMM = 0x4d4d, /* 'MM' */
+ TBYTE = 1,
+ TASCII = 2,
+ TSHORT = 3,
+ TLONG = 4,
+ TRATIONAL = 5
+};
+
+#define NewSubfileType 254
+#define ImageWidth 256
+#define ImageLength 257
+#define BitsPerSample 258
+#define Compression 259
+#define PhotometricInterpretation 262
+#define FillOrder 266
+#define StripOffsets 273
+#define SamplesPerPixel 277
+#define RowsPerStrip 278
+#define StripByteCounts 279
+#define XResolution 282
+#define YResolution 283
+#define PlanarConfiguration 284
+#define T4Options 292
+#define T6Options 293
+#define ResolutionUnit 296
+#define Predictor 317
+#define ColorMap 320
+#define TileWidth 322
+#define TileLength 323
+#define TileOffsets 324
+#define TileByteCounts 325
+#define ExtraSamples 338
+#define JPEGTables 347
+#define YCbCrSubSampling 520
+#define ICCProfile 34675
+
+static const byte bitrev[256] =
+{
+ 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
+ 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
+ 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
+ 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
+ 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
+ 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
+ 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
+ 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
+ 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
+ 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
+ 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
+ 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
+ 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
+ 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
+ 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
+ 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
+ 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
+ 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
+ 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
+ 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
+ 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
+ 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
+ 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
+ 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
+ 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
+ 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
+ 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
+ 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
+ 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
+ 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
+ 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
+ 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
+};
+
+static int
+xps_report_error(stream_state * st, const char *str)
+{
+ (void) gs_throw1(-1, "%s", str);
+ return 0;
+}
+
+static inline int
+readbyte(xps_tiff_t *tiff)
+{
+ if (tiff->rp < tiff->ep)
+ return *tiff->rp++;
+ return EOF;
+}
+
+static inline unsigned
+readshort(xps_tiff_t *tiff)
+{
+ unsigned a = readbyte(tiff);
+ unsigned b = readbyte(tiff);
+ if (tiff->order == TII)
+ return (b << 8) | a;
+ return (a << 8) | b;
+}
+
+static inline unsigned
+readlong(xps_tiff_t *tiff)
+{
+ unsigned a = readbyte(tiff);
+ unsigned b = readbyte(tiff);
+ unsigned c = readbyte(tiff);
+ unsigned d = readbyte(tiff);
+ if (tiff->order == TII)
+ return (d << 24) | (c << 16) | (b << 8) | a;
+ return (a << 24) | (b << 16) | (c << 8) | d;
+}
+
+static int
+xps_decode_tiff_uncompressed(xps_context_t *ctx, xps_tiff_t *tiff, byte *rp, byte *rl, byte *wp, byte *wl)
+{
+ memcpy(wp, rp, wl - wp);
+ return gs_okay;
+}
+
+static int
+xps_decode_tiff_packbits(xps_context_t *ctx, xps_tiff_t *tiff, byte *rp, byte *rl, byte *wp, byte *wl)
+{
+ stream_RLD_state state;
+ stream_cursor_read scr;
+ stream_cursor_write scw;
+ int code;
+
+ s_init_state((stream_state*)&state, &s_RLD_template, ctx->memory);
+ state.report_error = xps_report_error;
+
+ s_RLD_template.set_defaults((stream_state*)&state);
+ s_RLD_template.init((stream_state*)&state);
+
+ scr.ptr = rp - 1;
+ scr.limit = rl - 1;
+ scw.ptr = wp - 1;
+ scw.limit = wl - 1;
+
+ code = s_RLD_template.process((stream_state*)&state, &scr, &scw, true);
+ if (code == ERRC)
+ return gs_throw1(-1, "error in packbits data (code = %d)", code);
+
+ return gs_okay;
+}
+
+static int
+xps_decode_tiff_lzw(xps_context_t *ctx, xps_tiff_t *tiff, byte *rp, byte *rl, byte *wp, byte *wl)
+{
+ stream_LZW_state state;
+ stream_cursor_read scr;
+ stream_cursor_write scw;
+ int code;
+
+ s_init_state((stream_state*)&state, &s_LZWD_template, ctx->memory);
+ state.report_error = xps_report_error;
+
+ s_LZWD_template.set_defaults((stream_state*)&state);
+
+ /* old-style TIFF 5.0 reversed bit order, late change */
+ if (rp[0] == 0 && rp[1] & 0x01)
+ {
+ state.EarlyChange = 0;
+ state.FirstBitLowOrder = 1;
+ }
+
+ /* new-style TIFF 6.0 normal bit order, early change */
+ else
+ {
+ state.EarlyChange = 1;
+ state.FirstBitLowOrder = 0;
+ }
+
+ s_LZWD_template.init((stream_state*)&state);
+
+ scr.ptr = rp - 1;
+ scr.limit = rl - 1;
+ scw.ptr = wp - 1;
+ scw.limit = wl - 1;
+
+ code = s_LZWD_template.process((stream_state*)&state, &scr, &scw, true);
+ if (code == ERRC)
+ {
+ s_LZWD_template.release((stream_state*)&state);
+ return gs_throw1(-1, "error in lzw data (code = %d)", code);
+ }
+
+ s_LZWD_template.release((stream_state*)&state);
+
+ return gs_okay;
+}
+
+static int
+xps_decode_tiff_flate(xps_context_t *ctx, xps_tiff_t *tiff, byte *rp, byte *rl, byte *wp, byte *wl)
+{
+ stream_zlib_state state;
+ stream_cursor_read scr;
+ stream_cursor_write scw;
+ int code;
+
+ s_init_state((stream_state*)&state, &s_zlibD_template, ctx->memory);
+ state.report_error = xps_report_error;
+
+ s_zlibD_template.set_defaults((stream_state*)&state);
+
+ s_zlibD_template.init((stream_state*)&state);
+
+ scr.ptr = rp - 1;
+ scr.limit = rl - 1;
+ scw.ptr = wp - 1;
+ scw.limit = wl - 1;
+
+ code = s_zlibD_template.process((stream_state*)&state, &scr, &scw, true);
+ if (code == ERRC)
+ {
+ s_zlibD_template.release((stream_state*)&state);
+ return gs_throw1(-1, "error in flate data (code = %d)", code);
+ }
+
+ s_zlibD_template.release((stream_state*)&state);
+ return gs_okay;
+}
+
+static int
+xps_decode_tiff_fax(xps_context_t *ctx, xps_tiff_t *tiff, int comp, byte *rp, byte *rl, byte *wp, byte *wl)
+{
+ stream_CFD_state state;
+ stream_cursor_read scr;
+ stream_cursor_write scw;
+ int code;
+
+ s_init_state((stream_state*)&state, &s_CFD_template, ctx->memory);
+ state.report_error = xps_report_error;
+
+ s_CFD_template.set_defaults((stream_state*)&state);
+
+ state.EndOfLine = false;
+ state.EndOfBlock = false;
+ state.Columns = tiff->imagewidth;
+ state.Rows = tiff->imagelength;
+ state.BlackIs1 = tiff->photometric == 0;
+
+ state.K = 0;
+ if (comp == 4)
+ state.K = -1;
+ if (comp == 2)
+ state.EncodedByteAlign = true;
+
+ s_CFD_template.init((stream_state*)&state);
+
+ scr.ptr = rp - 1;
+ scr.limit = rl - 1;
+ scw.ptr = wp - 1;
+ scw.limit = wl - 1;
+
+ code = s_CFD_template.process((stream_state*)&state, &scr, &scw, true);
+ if (code == ERRC)
+ {
+ s_CFD_template.release((stream_state*)&state);
+ return gs_throw1(-1, "error in fax data (code = %d)", code);
+ }
+
+ s_CFD_template.release((stream_state*)&state);
+ return gs_okay;
+}
+
+/*
+ * We need more find control over JPEG decoding parameters than
+ * the s_DCTD_template filter will give us. So we abuse the
+ * filter, and take control after the filter setup (which sets up
+ * the memory manager and error handling) and call the gs_jpeg
+ * wrappers directly for doing the actual decoding.
+ */
+
+static int
+xps_decode_tiff_jpeg(xps_context_t *ctx, xps_tiff_t *tiff, byte *rp, byte *rl, byte *wp, byte *wl)
+{
+ stream_DCT_state state; /* used by gs_jpeg_* wrappers */
+ jpeg_decompress_data jddp;
+ struct jpeg_source_mgr *srcmgr;
+ JSAMPROW scanlines[1];
+ int stride;
+ int code;
+
+ /*
+ * Set up the JPEG and DCT filter voodoo.
+ */
+
+ s_init_state((stream_state*)&state, &s_DCTD_template, ctx->memory);
+ state.report_error = xps_report_error;
+ s_DCTD_template.set_defaults((stream_state*)&state);
+
+ state.jpeg_memory = ctx->memory;
+ state.data.decompress = &jddp;
+
+ jddp.template = s_DCTD_template;
+ jddp.memory = ctx->memory;
+ jddp.scanline_buffer = NULL;
+
+ if ((code = gs_jpeg_create_decompress(&state)) < 0)
+ return gs_throw(-1, "error in gs_jpeg_create_decompress");
+
+ s_DCTD_template.init((stream_state*)&state);
+
+ srcmgr = jddp.dinfo.src;
+
+ /*
+ * Read the abbreviated table file.
+ */
+
+ if (tiff->jpegtables)
+ {
+ srcmgr->next_input_byte = tiff->jpegtables;
+ srcmgr->bytes_in_buffer = tiff->jpegtableslen;
+
+ code = gs_jpeg_read_header(&state, FALSE);
+ if (code != JPEG_HEADER_TABLES_ONLY)
+ return gs_throw(-1, "error in jpeg table data");
+ }
+
+ /*
+ * Read the image jpeg header.
+ */
+
+ srcmgr->next_input_byte = rp;
+ srcmgr->bytes_in_buffer = rl - rp;
+
+ if ((code = gs_jpeg_read_header(&state, TRUE)) < 0)
+ return gs_throw(-1, "error in jpeg_read_header");
+
+ /* when TIFF says RGB and libjpeg says YCbCr, libjpeg is wrong */
+ if (tiff->photometric == 2 && jddp.dinfo.jpeg_color_space == JCS_YCbCr)
+ {
+ jddp.dinfo.jpeg_color_space = JCS_RGB;
+ }
+
+ /*
+ * Decode the strip image data.
+ */
+
+ if ((code = gs_jpeg_start_decompress(&state)) < 0)
+ return gs_throw(-1, "error in jpeg_start_decompress");
+
+ stride = jddp.dinfo.output_width * jddp.dinfo.output_components;
+
+ while (wp + stride <= wl && jddp.dinfo.output_scanline < jddp.dinfo.output_height)
+ {
+ scanlines[0] = wp;
+ code = gs_jpeg_read_scanlines(&state, scanlines, 1);
+ if (code < 0)
+ return gs_throw(01, "error in jpeg_read_scanlines");
+ wp += stride;
+ }
+
+ /*
+ * Clean up.
+ */
+
+ if ((code = gs_jpeg_finish_decompress(&state)) < 0)
+ return gs_throw(-1, "error in jpeg_finish_decompress");
+
+ gs_jpeg_destroy(&state);
+
+ return gs_okay;
+}
+
+static inline int
+getcomp(byte *line, int x, int bpc)
+{
+ switch (bpc)
+ {
+ case 1: return line[x / 8] >> (7 - (x % 8)) & 0x01;
+ case 2: return line[x / 4] >> ((3 - (x % 4)) * 2) & 0x03;
+ case 4: return line[x / 2] >> ((1 - (x % 2)) * 4) & 0x0f;
+ case 8: return line[x];
+ case 16: return ((line[x * 2 + 0]) << 8) | (line[x * 2 + 1]);
+ }
+ return 0;
+}
+
+static inline void
+putcomp(byte *line, int x, int bpc, int value)
+{
+ int maxval = (1 << bpc) - 1;
+
+ // clear bits first
+ switch (bpc)
+ {
+ case 1: line[x / 8] &= ~(maxval << (7 - (x % 8))); break;
+ case 2: line[x / 4] &= ~(maxval << ((3 - (x % 4)) * 2)); break;
+ case 4: line[x / 2] &= ~(maxval << ((1 - (x % 2)) * 4)); break;
+ }
+
+ switch (bpc)
+ {
+ case 1: line[x / 8] |= value << (7 - (x % 8)); break;
+ case 2: line[x / 4] |= value << ((3 - (x % 4)) * 2); break;
+ case 4: line[x / 2] |= value << ((1 - (x % 2)) * 4); break;
+ case 8: line[x] = value; break;
+ case 16: line[x * 2 + 0] = value >> 8; line[x * 2 + 1] = value & 0xFF; break;
+ }
+}
+
+static void
+xps_unpredict_tiff(byte *line, int width, int comps, int bits)
+{
+ byte left[32];
+ int i, k, v;
+
+ for (k = 0; k < comps; k++)
+ left[k] = 0;
+
+ for (i = 0; i < width; i++)
+ {
+ for (k = 0; k < comps; k++)
+ {
+ v = getcomp(line, i * comps + k, bits);
+ v = v + left[k];
+ v = v % (1 << bits);
+ putcomp(line, i * comps + k, bits, v);
+ left[k] = v;
+ }
+ }
+}
+
+static void
+xps_invert_tiff(byte *line, int width, int comps, int bits, int alpha)
+{
+ int i, k, v;
+ int m = (1 << bits) - 1;
+
+ for (i = 0; i < width; i++)
+ {
+ for (k = 0; k < comps; k++)
+ {
+ v = getcomp(line, i * comps + k, bits);
+ if (!alpha || k < comps - 1)
+ v = m - v;
+ putcomp(line, i * comps + k, bits, v);
+ }
+ }
+}
+
+static int
+xps_expand_colormap(xps_context_t *ctx, xps_tiff_t *tiff, xps_image_t *image)
+{
+ int maxval = 1 << image->bits;
+ byte *samples;
+ byte *src, *dst;
+ int stride;
+ int x, y;
+
+ /* colormap has first all red, then all green, then all blue values */
+ /* colormap values are 0..65535, bits is 4 or 8 */
+ /* image can be with or without extrasamples: comps is 1 or 2 */
+
+ if (image->comps != 1 && image->comps != 2)
+ return gs_throw(-1, "invalid number of samples for RGBPal");
+
+ if (image->bits != 4 && image->bits != 8)
+ return gs_throw(-1, "invalid number of bits for RGBPal");
+
+ stride = image->width * (image->comps + 2);
+
+ samples = xps_alloc(ctx, stride * image->height);
+ if (!samples)
+ return gs_throw(-1, "out of memory: samples");
+
+ for (y = 0; y < image->height; y++)
+ {
+ src = image->samples + (image->stride * y);
+ dst = samples + (stride * y);
+
+ for (x = 0; x < image->width; x++)
+ {
+ if (tiff->extrasamples)
+ {
+ int c = getcomp(src, x * 2, image->bits);
+ int a = getcomp(src, x * 2 + 1, image->bits);
+ *dst++ = tiff->colormap[c + 0] >> 8;
+ *dst++ = tiff->colormap[c + maxval] >> 8;
+ *dst++ = tiff->colormap[c + maxval * 2] >> 8;
+ *dst++ = a << (8 - image->bits);
+ }
+ else
+ {
+ int c = getcomp(src, x, image->bits);
+ *dst++ = tiff->colormap[c + 0] >> 8;
+ *dst++ = tiff->colormap[c + maxval] >> 8;
+ *dst++ = tiff->colormap[c + maxval * 2] >> 8;
+ }
+ }
+ }
+
+ image->bits = 8;
+ image->stride = stride;
+ image->samples = samples;
+
+ return gs_okay;
+}
+
+static int
+xps_decode_tiff_strips(xps_context_t *ctx, xps_tiff_t *tiff, xps_image_t *image)
+{
+ int error;
+
+ /* switch on compression to create a filter */
+ /* feed each strip to the filter */
+ /* read out the data and pack the samples into an xps_image */
+
+ /* type 32773 / packbits -- nothing special (same row-padding as PDF) */
+ /* type 2 / ccitt rle -- no EOL, no RTC, rows are byte-aligned */
+ /* type 3 and 4 / g3 and g4 -- each strip starts new section */
+ /* type 5 / lzw -- each strip is handled separately */
+
+ byte *wp;
+ unsigned row;
+ unsigned strip;
+ unsigned i;
+
+ if (!tiff->rowsperstrip || !tiff->stripoffsets || !tiff->rowsperstrip)
+ return gs_throw(-1, "no image data in tiff; maybe it is tiled");
+
+ if (tiff->planar != 1)
+ return gs_throw(-1, "image data is not in chunky format");
+
+ image->width = tiff->imagewidth;
+ image->height = tiff->imagelength;
+ image->comps = tiff->samplesperpixel;
+ image->bits = tiff->bitspersample;
+ image->stride = (image->width * image->comps * image->bits + 7) / 8;
+
+ switch (tiff->photometric)
+ {
+ case 0: /* WhiteIsZero -- inverted */
+ image->colorspace = ctx->gray;
+ break;
+ case 1: /* BlackIsZero */
+ image->colorspace = ctx->gray;
+ break;
+ case 2: /* RGB */
+ image->colorspace = ctx->srgb;
+ break;
+ case 3: /* RGBPal */
+ image->colorspace = ctx->srgb;
+ break;
+ case 5: /* CMYK */
+ image->colorspace = ctx->cmyk;
+ break;
+ case 6: /* YCbCr */
+ /* it's probably a jpeg ... we let jpeg convert to rgb */
+ image->colorspace = ctx->srgb;
+ break;
+ default:
+ return gs_throw1(-1, "unknown photometric: %d", tiff->photometric);
+ }
+
+ switch (tiff->resolutionunit)
+ {
+ case 2:
+ image->xres = tiff->xresolution;
+ image->yres = tiff->yresolution;
+ break;
+ case 3:
+ image->xres = tiff->xresolution * 2.54 + 0.5;
+ image->yres = tiff->yresolution * 2.54 + 0.5;
+
+ break;
+ default:
+ image->xres = 96;
+ image->yres = 96;
+ break;
+ }
+
+ /* Note xres and yres could be 0 even if unit was set. If so default to 96dpi */
+ if (image->xres == 0 || image->yres == 0)
+ {
+ image->xres = 96;
+ image->yres = 96;
+ }
+
+ image->samples = xps_alloc(ctx, image->stride * image->height);
+ if (!image->samples)
+ return gs_throw(-1, "could not allocate image samples");
+
+ memset(image->samples, 0x55, image->stride * image->height);
+
+ wp = image->samples;
+
+ strip = 0;
+ for (row = 0; row < tiff->imagelength; row += tiff->rowsperstrip)
+ {
+ unsigned offset = tiff->stripoffsets[strip];
+ unsigned rlen = tiff->stripbytecounts[strip];
+ unsigned wlen = image->stride * tiff->rowsperstrip;
+ byte *rp = tiff->bp + offset;
+
+ if (wp + wlen > image->samples + image->stride * image->height)
+ wlen = image->samples + image->stride * image->height - wp;
+
+ if (rp + rlen > tiff->ep)
+ return gs_throw(-1, "strip extends beyond the end of the file");
+
+ /* the bits are in un-natural order */
+ if (tiff->fillorder == 2)
+ for (i = 0; i < rlen; i++)
+ rp[i] = bitrev[rp[i]];
+
+ switch (tiff->compression)
+ {
+ case 1:
+ error = xps_decode_tiff_uncompressed(ctx, tiff, rp, rp + rlen, wp, wp + wlen);
+ break;
+ case 2:
+ error = xps_decode_tiff_fax(ctx, tiff, 2, rp, rp + rlen, wp, wp + wlen);
+ break;
+ case 3:
+ error = xps_decode_tiff_fax(ctx, tiff, 3, rp, rp + rlen, wp, wp + wlen);
+ break;
+ case 4:
+ error = xps_decode_tiff_fax(ctx, tiff, 4, rp, rp + rlen, wp, wp + wlen);
+ break;
+ case 5:
+ error = xps_decode_tiff_lzw(ctx, tiff, rp, rp + rlen, wp, wp + wlen);
+ break;
+ case 6:
+ error = gs_throw(-1, "deprecated JPEG in TIFF compression not supported");
+ break;
+ case 7:
+ error = xps_decode_tiff_jpeg(ctx, tiff, rp, rp + rlen, wp, wp + wlen);
+ break;
+ case 8:
+ error = xps_decode_tiff_flate(ctx, tiff, rp, rp + rlen, wp, wp + wlen);
+ break;
+ case 32773:
+ error = xps_decode_tiff_packbits(ctx, tiff, rp, rp + rlen, wp, wp + wlen);
+ break;
+ default:
+ error = gs_throw1(-1, "unknown TIFF compression: %d", tiff->compression);
+ }
+
+ if (error)
+ return gs_rethrow1(error, "could not decode strip %d", row / tiff->rowsperstrip);
+
+ /* scramble the bits back into original order */
+ if (tiff->fillorder == 2)
+ for (i = 0; i < rlen; i++)
+ rp[i] = bitrev[rp[i]];
+
+ wp += image->stride * tiff->rowsperstrip;
+ strip ++;
+ }
+
+ /* Predictor (only for LZW and Flate) */
+ if ((tiff->compression == 5 || tiff->compression == 8) && tiff->predictor == 2)
+ {
+ byte *p = image->samples;
+ for (i = 0; i < image->height; i++)
+ {
+ xps_unpredict_tiff(p, image->width, tiff->samplesperpixel, image->bits);
+ p += image->stride;
+ }
+ }
+
+ /* RGBPal */
+ if (tiff->photometric == 3 && tiff->colormap)
+ {
+ error = xps_expand_colormap(ctx, tiff, image);
+ if (error)
+ return gs_rethrow(error, "could not expand colormap");
+ }
+
+ /* WhiteIsZero .. invert */
+ if (tiff->photometric == 0)
+ {
+ byte *p = image->samples;
+ for (i = 0; i < image->height; i++)
+ {
+ xps_invert_tiff(p, image->width, image->comps, image->bits, tiff->extrasamples);
+ p += image->stride;
+ }
+ }
+
+ /* Premultiplied transparency */
+ if (tiff->extrasamples == 1)
+ {
+ image->hasalpha = 1;
+ }
+
+ /* Non-pre-multiplied transparency */
+ if (tiff->extrasamples == 2)
+ {
+ image->hasalpha = 1;
+ }
+
+ return gs_okay;
+}
+
+static void
+xps_read_tiff_bytes(unsigned char *p, xps_tiff_t *tiff, unsigned ofs, unsigned n)
+{
+ tiff->rp = tiff->bp + ofs;
+ if (tiff->rp > tiff->ep)
+ tiff->rp = tiff->bp;
+
+ while (n--)
+ {
+ *p++ = readbyte(tiff);
+ }
+}
+
+static void
+xps_read_tiff_tag_value(unsigned *p, xps_tiff_t *tiff, unsigned type, unsigned ofs, unsigned n)
+{
+ tiff->rp = tiff->bp + ofs;
+ if (tiff->rp > tiff->ep)
+ tiff->rp = tiff->bp;
+
+ while (n--)
+ {
+ switch (type)
+ {
+ case TRATIONAL:
+ *p = readlong(tiff);
+ *p = *p / readlong(tiff);
+ p ++;
+ break;
+ case TBYTE: *p++ = readbyte(tiff); break;
+ case TSHORT: *p++ = readshort(tiff); break;
+ case TLONG: *p++ = readlong(tiff); break;
+ default: *p++ = 0; break;
+ }
+ }
+}
+
+static int
+xps_read_tiff_tag(xps_context_t *ctx, xps_tiff_t *tiff, unsigned offset)
+{
+ unsigned tag;
+ unsigned type;
+ unsigned count;
+ unsigned value;
+
+ tiff->rp = tiff->bp + offset;
+
+ tag = readshort(tiff);
+ type = readshort(tiff);
+ count = readlong(tiff);
+
+ if ((type == TBYTE && count <= 4) ||
+ (type == TSHORT && count <= 2) ||
+ (type == TLONG && count <= 1))
+ value = tiff->rp - tiff->bp;
+ else
+ value = readlong(tiff);
+
+ switch (tag)
+ {
+ case NewSubfileType:
+ xps_read_tiff_tag_value(&tiff->subfiletype, tiff, type, value, 1);
+ break;
+ case ImageWidth:
+ xps_read_tiff_tag_value(&tiff->imagewidth, tiff, type, value, 1);
+ break;
+ case ImageLength:
+ xps_read_tiff_tag_value(&tiff->imagelength, tiff, type, value, 1);
+ break;
+ case BitsPerSample:
+ xps_read_tiff_tag_value(&tiff->bitspersample, tiff, type, value, 1);
+ break;
+ case Compression:
+ xps_read_tiff_tag_value(&tiff->compression, tiff, type, value, 1);
+ break;
+ case PhotometricInterpretation:
+ xps_read_tiff_tag_value(&tiff->photometric, tiff, type, value, 1);
+ break;
+ case FillOrder:
+ xps_read_tiff_tag_value(&tiff->fillorder, tiff, type, value, 1);
+ break;
+ case SamplesPerPixel:
+ xps_read_tiff_tag_value(&tiff->samplesperpixel, tiff, type, value, 1);
+ break;
+ case RowsPerStrip:
+ xps_read_tiff_tag_value(&tiff->rowsperstrip, tiff, type, value, 1);
+ break;
+ case XResolution:
+ xps_read_tiff_tag_value(&tiff->xresolution, tiff, type, value, 1);
+ break;
+ case YResolution:
+ xps_read_tiff_tag_value(&tiff->yresolution, tiff, type, value, 1);
+ break;
+ case PlanarConfiguration:
+ xps_read_tiff_tag_value(&tiff->planar, tiff, type, value, 1);
+ break;
+ case T4Options:
+ xps_read_tiff_tag_value(&tiff->g3opts, tiff, type, value, 1);
+ break;
+ case T6Options:
+ xps_read_tiff_tag_value(&tiff->g4opts, tiff, type, value, 1);
+ break;
+ case Predictor:
+ xps_read_tiff_tag_value(&tiff->predictor, tiff, type, value, 1);
+ break;
+ case ResolutionUnit:
+ xps_read_tiff_tag_value(&tiff->resolutionunit, tiff, type, value, 1);
+ break;
+ case YCbCrSubSampling:
+ xps_read_tiff_tag_value(tiff->ycbcrsubsamp, tiff, type, value, 2);
+ break;
+ case ExtraSamples:
+ xps_read_tiff_tag_value(&tiff->extrasamples, tiff, type, value, 1);
+ break;
+ case ICCProfile:
+ tiff->profile = xps_alloc(ctx, count);
+ if (!tiff->profile)
+ return gs_throw(-1, "could not allocate embedded icc profile");
+ /* ICC profile data type is set to UNDEFINED.
+ * TBYTE reading not correct in xps_read_tiff_tag_value */
+ xps_read_tiff_bytes(tiff->profile, tiff, value, count);
+ tiff->profilesize = count;
+ break;
+
+ case JPEGTables:
+ tiff->jpegtables = tiff->bp + value;
+ tiff->jpegtableslen = count;
+ break;
+
+ case StripOffsets:
+ tiff->stripoffsets = (unsigned*) xps_alloc(ctx, count * sizeof(unsigned));
+ if (!tiff->stripoffsets)
+ return gs_throw(-1, "could not allocate strip offsets");
+ xps_read_tiff_tag_value(tiff->stripoffsets, tiff, type, value, count);
+ break;
+
+ case StripByteCounts:
+ tiff->stripbytecounts = (unsigned*) xps_alloc(ctx, count * sizeof(unsigned));
+ if (!tiff->stripbytecounts)
+ return gs_throw(-1, "could not allocate strip byte counts");
+ xps_read_tiff_tag_value(tiff->stripbytecounts, tiff, type, value, count);
+ break;
+
+ case ColorMap:
+ tiff->colormap = (unsigned*) xps_alloc(ctx, count * sizeof(unsigned));
+ if (!tiff->colormap)
+ return gs_throw(-1, "could not allocate color map");
+ xps_read_tiff_tag_value(tiff->colormap, tiff, type, value, count);
+ break;
+
+ case TileWidth:
+ case TileLength:
+ case TileOffsets:
+ case TileByteCounts:
+ return gs_throw(-1, "tiled tiffs not supported");
+
+ default:
+ /* printf("unknown tag: %d t=%d n=%d\n", tag, type, count); */
+ break;
+ }
+
+ return gs_okay;
+}
+
+static void
+xps_swap_byte_order(byte *buf, int n)
+{
+ int i, t;
+ for (i = 0; i < n; i++)
+ {
+ t = buf[i * 2 + 0];
+ buf[i * 2 + 0] = buf[i * 2 + 1];
+ buf[i * 2 + 1] = t;
+ }
+}
+
+static int
+xps_decode_tiff_header(xps_context_t *ctx, xps_tiff_t *tiff, byte *buf, int len)
+{
+ unsigned version;
+ unsigned offset;
+ unsigned count;
+ unsigned i;
+ int error;
+
+ memset(tiff, 0, sizeof(xps_tiff_t));
+
+ tiff->bp = buf;
+ tiff->rp = buf;
+ tiff->ep = buf + len;
+
+ /* tag defaults, where applicable */
+ tiff->bitspersample = 1;
+ tiff->compression = 1;
+ tiff->samplesperpixel = 1;
+ tiff->resolutionunit = 2;
+ tiff->rowsperstrip = 0xFFFFFFFF;
+ tiff->fillorder = 1;
+ tiff->planar = 1;
+ tiff->subfiletype = 0;
+ tiff->predictor = 1;
+ tiff->ycbcrsubsamp[0] = 2;
+ tiff->ycbcrsubsamp[1] = 2;
+
+ /*
+ * Read IFH
+ */
+
+ /* get byte order marker */
+ tiff->order = TII;
+ tiff->order = readshort(tiff);
+ if (tiff->order != TII && tiff->order != TMM)
+ return gs_throw(-1, "not a TIFF file, wrong magic marker");
+
+ /* check version */
+ version = readshort(tiff);
+ if (version != 42)
+ return gs_throw(-1, "not a TIFF file, wrong version marker");
+
+ /* get offset of IFD */
+ offset = readlong(tiff);
+
+ /*
+ * Read IFD
+ */
+
+ tiff->rp = tiff->bp + offset;
+
+ count = readshort(tiff);
+
+ offset += 2;
+ for (i = 0; i < count; i++)
+ {
+ error = xps_read_tiff_tag(ctx, tiff, offset);
+ if (error)
+ return gs_rethrow(error, "could not read TIFF header tag");
+ offset += 12;
+ }
+
+ return gs_okay;
+}
+
+int
+xps_decode_tiff(xps_context_t *ctx, byte *buf, int len, xps_image_t *image)
+{
+ int error;
+ xps_tiff_t tiffst;
+ xps_tiff_t *tiff = &tiffst;
+
+ error = xps_decode_tiff_header(ctx, tiff, buf, len);
+ if (error)
+ return gs_rethrow(error, "cannot decode tiff header");
+
+ /*
+ * Decode the image strips
+ */
+
+ if (tiff->rowsperstrip > tiff->imagelength)
+ tiff->rowsperstrip = tiff->imagelength;
+
+ error = xps_decode_tiff_strips(ctx, tiff, image);
+ if (error)
+ return gs_rethrow(error, "could not decode image data");
+
+ /*
+ * Byte swap 16-bit images to big endian if necessary.
+ */
+ if (image->bits == 16)
+ {
+ if (tiff->order == TII)
+ xps_swap_byte_order(image->samples, image->width * image->height * image->comps);
+ }
+
+ /*
+ * Save ICC profile data
+ */
+ image->profile = tiff->profile;
+ image->profilesize = tiff->profilesize;
+
+ /*
+ * Clean up scratch memory
+ */
+
+ if (tiff->colormap) xps_free(ctx, tiff->colormap);
+ if (tiff->stripoffsets) xps_free(ctx, tiff->stripoffsets);
+ if (tiff->stripbytecounts) xps_free(ctx, tiff->stripbytecounts);
+
+ return gs_okay;
+}
+
+int
+xps_tiff_has_alpha(xps_context_t *ctx, byte *buf, int len)
+{
+ int error;
+ xps_tiff_t tiffst;
+ xps_tiff_t *tiff = &tiffst;
+
+ error = xps_decode_tiff_header(ctx, tiff, buf, len);
+ if (error)
+ {
+ gs_catch(error, "cannot decode tiff header");
+ return 0;
+ }
+
+ if (tiff->profile) xps_free(ctx, tiff->profile);
+ if (tiff->colormap) xps_free(ctx, tiff->colormap);
+ if (tiff->stripoffsets) xps_free(ctx, tiff->stripoffsets);
+ if (tiff->stripbytecounts) xps_free(ctx, tiff->stripbytecounts);
+
+ return tiff->extrasamples == 2 || tiff->extrasamples == 1;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-03-20 00:41:13 +0000