/
raster-stream.c
1873 lines (1555 loc) · 47.9 KB
/
raster-stream.c
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/*
* Raster file routines for CUPS.
*
* Copyright 2007-2019 by Apple Inc.
* Copyright 1997-2006 by Easy Software Products.
*
* This file is part of the CUPS Imaging library.
*
* Licensed under Apache License v2.0. See the file "LICENSE" for more
* information.
*/
/*
* Include necessary headers...
*/
#include "raster-private.h"
#include "debug-internal.h"
#ifdef HAVE_STDINT_H
# include <stdint.h>
#endif /* HAVE_STDINT_H */
/*
* Private structures...
*/
typedef void (*_cups_copyfunc_t)(void *dst, const void *src, size_t bytes);
/*
* Local globals...
*/
static const char * const apple_media_types[] =
{ /* media-type values for Apple Raster */
"auto",
"stationery",
"transparency",
"envelope",
"cardstock",
"labels",
"stationery-letterhead",
"disc",
"photographic-matte",
"photographic-satin",
"photographic-semi-gloss",
"photographic-glossy",
"photographic-high-gloss",
"other"
};
#ifdef DEBUG
static const char * const cups_modes[] =
{ /* Open modes */
"CUPS_RASTER_READ",
"CUPS_RASTER_WRITE",
"CUPS_RASTER_WRITE_COMPRESSED",
"CUPS_RASTER_WRITE_PWG",
"CUPS_RASTER_WRITE_APPLE"
};
#endif /* DEBUG */
/*
* Local functions...
*/
static ssize_t cups_raster_io(cups_raster_t *r, unsigned char *buf, size_t bytes);
static ssize_t cups_raster_read(cups_raster_t *r, unsigned char *buf, size_t bytes);
static int cups_raster_update(cups_raster_t *r);
static ssize_t cups_raster_write(cups_raster_t *r, const unsigned char *pixels);
static void cups_swap(unsigned char *buf, size_t bytes);
static void cups_swap_copy(unsigned char *dst, const unsigned char *src, size_t bytes);
/*
* '_cupsRasterColorSpaceString()' - Return the colorspace name for a
* cupsColorSpace value.
*/
const char *
_cupsRasterColorSpaceString(
cups_cspace_t cspace) /* I - cupsColorSpace value */
{
static const char * const cups_color_spaces[] =
{ /* Color spaces */
"W",
"RGB",
"RGBA",
"K",
"CMY",
"YMC",
"CMYK",
"YMCK",
"KCMY",
"KCMYcm",
"GMCK",
"GMCS",
"WHITE",
"GOLD",
"SILVER",
"CIEXYZ",
"CIELab",
"RGBW",
"SW",
"SRGB",
"ADOBERGB",
"21",
"22",
"23",
"24",
"25",
"26",
"27",
"28",
"29",
"30",
"31",
"ICC1",
"ICC2",
"ICC3",
"ICC4",
"ICC5",
"ICC6",
"ICC7",
"ICC8",
"ICC9",
"ICCA",
"ICCB",
"ICCC",
"ICCD",
"ICCE",
"ICCF",
"47",
"DEVICE1",
"DEVICE2",
"DEVICE3",
"DEVICE4",
"DEVICE5",
"DEVICE6",
"DEVICE7",
"DEVICE8",
"DEVICE9",
"DEVICEA",
"DEVICEB",
"DEVICEC",
"DEVICED",
"DEVICEE",
"DEVICEF"
};
if (cspace < CUPS_CSPACE_W || cspace > CUPS_CSPACE_DEVICEF)
return ("Unknown");
else
return (cups_color_spaces[cspace]);
}
/*
* '_cupsRasterDelete()' - Free a raster stream.
*
* The file descriptor associated with the raster stream must be closed
* separately as needed.
*/
void
_cupsRasterDelete(cups_raster_t *r) /* I - Stream to free */
{
if (r != NULL)
{
if (r->buffer)
free(r->buffer);
if (r->pixels)
free(r->pixels);
free(r);
}
}
/*
* '_cupsRasterInitPWGHeader()' - Initialize a page header for PWG Raster output.
*
* The "media" argument specifies the media to use.
*
* The "type" argument specifies a "pwg-raster-document-type-supported" value
* that controls the color space and bit depth of the raster data.
*
* The "xres" and "yres" arguments specify the raster resolution in dots per
* inch.
*
* The "sheet_back" argument specifies a "pwg-raster-document-sheet-back" value
* to apply for the back side of a page. Pass @code NULL@ for the front side.
*
* @since CUPS 2.2/macOS 10.12@
*/
int /* O - 1 on success, 0 on failure */
_cupsRasterInitPWGHeader(
cups_page_header2_t *h, /* I - Page header */
pwg_media_t *media, /* I - PWG media information */
const char *type, /* I - PWG raster type string */
int xdpi, /* I - Cross-feed direction (horizontal) resolution */
int ydpi, /* I - Feed direction (vertical) resolution */
const char *sides, /* I - IPP "sides" option value */
const char *sheet_back) /* I - Transform for back side or @code NULL@ for none */
{
if (!h || !media || !type || xdpi <= 0 || ydpi <= 0)
{
_cupsRasterAddError("%s", strerror(EINVAL));
return (0);
}
/*
* Initialize the page header...
*/
memset(h, 0, sizeof(cups_page_header2_t));
strlcpy(h->cupsPageSizeName, media->pwg, sizeof(h->cupsPageSizeName));
h->PageSize[0] = (unsigned)(72 * media->width / 2540);
h->PageSize[1] = (unsigned)(72 * media->length / 2540);
/* This never gets written but is needed for some applications */
h->cupsPageSize[0] = 72.0f * media->width / 2540.0f;
h->cupsPageSize[1] = 72.0f * media->length / 2540.0f;
h->ImagingBoundingBox[2] = h->PageSize[0];
h->ImagingBoundingBox[3] = h->PageSize[1];
h->HWResolution[0] = (unsigned)xdpi;
h->HWResolution[1] = (unsigned)ydpi;
h->cupsWidth = (unsigned)(media->width * xdpi / 2540);
h->cupsHeight = (unsigned)(media->length * ydpi / 2540);
if (h->cupsWidth > 0x00ffffff || h->cupsHeight > 0x00ffffff)
{
_cupsRasterAddError("Raster dimensions too large.");
return (0);
}
h->cupsInteger[CUPS_RASTER_PWG_ImageBoxRight] = h->cupsWidth;
h->cupsInteger[CUPS_RASTER_PWG_ImageBoxBottom] = h->cupsHeight;
/*
* Colorspace and bytes per line...
*/
if (!strcmp(type, "adobe-rgb_8"))
{
h->cupsBitsPerColor = 8;
h->cupsBitsPerPixel = 24;
h->cupsColorSpace = CUPS_CSPACE_ADOBERGB;
}
else if (!strcmp(type, "adobe-rgb_16"))
{
h->cupsBitsPerColor = 16;
h->cupsBitsPerPixel = 48;
h->cupsColorSpace = CUPS_CSPACE_ADOBERGB;
}
else if (!strcmp(type, "black_1"))
{
h->cupsBitsPerColor = 1;
h->cupsBitsPerPixel = 1;
h->cupsColorSpace = CUPS_CSPACE_K;
}
else if (!strcmp(type, "black_8"))
{
h->cupsBitsPerColor = 8;
h->cupsBitsPerPixel = 8;
h->cupsColorSpace = CUPS_CSPACE_K;
}
else if (!strcmp(type, "black_16"))
{
h->cupsBitsPerColor = 16;
h->cupsBitsPerPixel = 16;
h->cupsColorSpace = CUPS_CSPACE_K;
}
else if (!strcmp(type, "cmyk_8"))
{
h->cupsBitsPerColor = 8;
h->cupsBitsPerPixel = 32;
h->cupsColorSpace = CUPS_CSPACE_CMYK;
}
else if (!strcmp(type, "cmyk_16"))
{
h->cupsBitsPerColor = 16;
h->cupsBitsPerPixel = 64;
h->cupsColorSpace = CUPS_CSPACE_CMYK;
}
else if (!strncmp(type, "device", 6) && type[6] >= '1' && type[6] <= '9')
{
int ncolors, bits; /* Number of colors and bits */
if (sscanf(type, "device%d_%d", &ncolors, &bits) != 2 || ncolors > 15 || (bits != 8 && bits != 16))
{
_cupsRasterAddError("Unsupported raster type \'%s\'.", type);
return (0);
}
h->cupsBitsPerColor = (unsigned)bits;
h->cupsBitsPerPixel = (unsigned)(ncolors * bits);
h->cupsColorSpace = (cups_cspace_t)(CUPS_CSPACE_DEVICE1 + ncolors - 1);
}
else if (!strcmp(type, "rgb_8"))
{
h->cupsBitsPerColor = 8;
h->cupsBitsPerPixel = 24;
h->cupsColorSpace = CUPS_CSPACE_RGB;
}
else if (!strcmp(type, "rgb_16"))
{
h->cupsBitsPerColor = 16;
h->cupsBitsPerPixel = 48;
h->cupsColorSpace = CUPS_CSPACE_RGB;
}
else if (!strcmp(type, "sgray_1"))
{
h->cupsBitsPerColor = 1;
h->cupsBitsPerPixel = 1;
h->cupsColorSpace = CUPS_CSPACE_SW;
}
else if (!strcmp(type, "sgray_8"))
{
h->cupsBitsPerColor = 8;
h->cupsBitsPerPixel = 8;
h->cupsColorSpace = CUPS_CSPACE_SW;
}
else if (!strcmp(type, "sgray_16"))
{
h->cupsBitsPerColor = 16;
h->cupsBitsPerPixel = 16;
h->cupsColorSpace = CUPS_CSPACE_SW;
}
else if (!strcmp(type, "srgb_8"))
{
h->cupsBitsPerColor = 8;
h->cupsBitsPerPixel = 24;
h->cupsColorSpace = CUPS_CSPACE_SRGB;
}
else if (!strcmp(type, "srgb_16"))
{
h->cupsBitsPerColor = 16;
h->cupsBitsPerPixel = 48;
h->cupsColorSpace = CUPS_CSPACE_SRGB;
}
else
{
_cupsRasterAddError("Unsupported raster type \'%s\'.", type);
return (0);
}
h->cupsColorOrder = CUPS_ORDER_CHUNKED;
h->cupsNumColors = h->cupsBitsPerPixel / h->cupsBitsPerColor;
h->cupsBytesPerLine = (h->cupsWidth * h->cupsBitsPerPixel + 7) / 8;
/*
* Duplex support...
*/
h->cupsInteger[CUPS_RASTER_PWG_CrossFeedTransform] = 1;
h->cupsInteger[CUPS_RASTER_PWG_FeedTransform] = 1;
if (sides)
{
if (!strcmp(sides, "two-sided-long-edge"))
{
h->Duplex = 1;
}
else if (!strcmp(sides, "two-sided-short-edge"))
{
h->Duplex = 1;
h->Tumble = 1;
}
else if (strcmp(sides, "one-sided"))
{
_cupsRasterAddError("Unsupported sides value \'%s\'.", sides);
return (0);
}
if (sheet_back)
{
if (!strcmp(sheet_back, "flipped"))
{
if (h->Tumble)
h->cupsInteger[CUPS_RASTER_PWG_CrossFeedTransform] = 0xffffffffU;
else
h->cupsInteger[CUPS_RASTER_PWG_FeedTransform] = 0xffffffffU;
}
else if (!strcmp(sheet_back, "manual-tumble"))
{
if (h->Tumble)
{
h->cupsInteger[CUPS_RASTER_PWG_CrossFeedTransform] = 0xffffffffU;
h->cupsInteger[CUPS_RASTER_PWG_FeedTransform] = 0xffffffffU;
}
}
else if (!strcmp(sheet_back, "rotated"))
{
if (!h->Tumble)
{
h->cupsInteger[CUPS_RASTER_PWG_CrossFeedTransform] = 0xffffffffU;
h->cupsInteger[CUPS_RASTER_PWG_FeedTransform] = 0xffffffffU;
}
}
else if (strcmp(sheet_back, "normal"))
{
_cupsRasterAddError("Unsupported sheet_back value \'%s\'.", sheet_back);
return (0);
}
}
}
return (1);
}
/*
* '_cupsRasterNew()' - Create a raster stream using a callback function.
*
* This function associates a raster stream with the given callback function and
* context pointer.
*
* When writing raster data, the @code CUPS_RASTER_WRITE@,
* @code CUPS_RASTER_WRITE_COMPRESS@, or @code CUPS_RASTER_WRITE_PWG@ mode can
* be used - compressed and PWG output is generally 25-50% smaller but adds a
* 100-300% execution time overhead.
*/
cups_raster_t * /* O - New stream */
_cupsRasterNew(
cups_raster_iocb_t iocb, /* I - Read/write callback */
void *ctx, /* I - Context pointer for callback */
cups_mode_t mode) /* I - Mode - @code CUPS_RASTER_READ@,
@code CUPS_RASTER_WRITE@,
@code CUPS_RASTER_WRITE_COMPRESSED@,
or @code CUPS_RASTER_WRITE_PWG@ */
{
cups_raster_t *r; /* New stream */
DEBUG_printf(("_cupsRasterOpenIO(iocb=%p, ctx=%p, mode=%s)", (void *)iocb, ctx, cups_modes[mode]));
_cupsRasterClearError();
if ((r = calloc(sizeof(cups_raster_t), 1)) == NULL)
{
_cupsRasterAddError("Unable to allocate memory for raster stream: %s\n",
strerror(errno));
DEBUG_puts("1_cupsRasterOpenIO: Returning NULL.");
return (NULL);
}
r->ctx = ctx;
r->iocb = iocb;
r->mode = mode;
if (mode == CUPS_RASTER_READ)
{
/*
* Open for read - get sync word...
*/
if (cups_raster_io(r, (unsigned char *)&(r->sync), sizeof(r->sync)) !=
sizeof(r->sync))
{
_cupsRasterAddError("Unable to read header from raster stream: %s\n",
strerror(errno));
free(r);
DEBUG_puts("1_cupsRasterOpenIO: Unable to read header, returning NULL.");
return (NULL);
}
if (r->sync != CUPS_RASTER_SYNC &&
r->sync != CUPS_RASTER_REVSYNC &&
r->sync != CUPS_RASTER_SYNCv1 &&
r->sync != CUPS_RASTER_REVSYNCv1 &&
r->sync != CUPS_RASTER_SYNCv2 &&
r->sync != CUPS_RASTER_REVSYNCv2 &&
r->sync != CUPS_RASTER_SYNCapple &&
r->sync != CUPS_RASTER_REVSYNCapple)
{
_cupsRasterAddError("Unknown raster format %08x!\n", r->sync);
free(r);
DEBUG_puts("1_cupsRasterOpenIO: Unknown format, returning NULL.");
return (NULL);
}
if (r->sync == CUPS_RASTER_SYNCv2 ||
r->sync == CUPS_RASTER_REVSYNCv2 ||
r->sync == CUPS_RASTER_SYNCapple ||
r->sync == CUPS_RASTER_REVSYNCapple)
r->compressed = 1;
DEBUG_printf(("1_cupsRasterOpenIO: sync=%08x", r->sync));
if (r->sync == CUPS_RASTER_REVSYNC ||
r->sync == CUPS_RASTER_REVSYNCv1 ||
r->sync == CUPS_RASTER_REVSYNCv2 ||
r->sync == CUPS_RASTER_REVSYNCapple)
r->swapped = 1;
if (r->sync == CUPS_RASTER_SYNCapple ||
r->sync == CUPS_RASTER_REVSYNCapple)
{
unsigned char header[8]; /* File header */
if (cups_raster_io(r, (unsigned char *)header, sizeof(header)) !=
sizeof(header))
{
_cupsRasterAddError("Unable to read header from raster stream: %s\n",
strerror(errno));
free(r);
DEBUG_puts("1_cupsRasterOpenIO: Unable to read header, returning NULL.");
return (NULL);
}
}
#ifdef DEBUG
r->iostart = r->iocount;
#endif /* DEBUG */
}
else
{
/*
* Open for write - put sync word...
*/
switch (mode)
{
default :
case CUPS_RASTER_WRITE :
r->sync = CUPS_RASTER_SYNC;
break;
case CUPS_RASTER_WRITE_COMPRESSED :
r->compressed = 1;
r->sync = CUPS_RASTER_SYNCv2;
break;
case CUPS_RASTER_WRITE_PWG :
r->compressed = 1;
r->sync = htonl(CUPS_RASTER_SYNC_PWG);
r->swapped = r->sync != CUPS_RASTER_SYNC_PWG;
break;
case CUPS_RASTER_WRITE_APPLE :
r->compressed = 1;
r->sync = htonl(CUPS_RASTER_SYNCapple);
r->swapped = r->sync != CUPS_RASTER_SYNCapple;
r->apple_page_count = 0xffffffffU;
break;
}
if (cups_raster_io(r, (unsigned char *)&(r->sync), sizeof(r->sync)) < (ssize_t)sizeof(r->sync))
{
_cupsRasterAddError("Unable to write raster stream header: %s\n",
strerror(errno));
free(r);
DEBUG_puts("1_cupsRasterOpenIO: Unable to write header, returning NULL.");
return (NULL);
}
}
DEBUG_printf(("1_cupsRasterOpenIO: compressed=%d, swapped=%d, returning %p", r->compressed, r->swapped, (void *)r));
return (r);
}
/*
* '_cupsRasterReadHeader()' - Read a raster page header.
*/
unsigned /* O - 1 on success, 0 on fail */
_cupsRasterReadHeader(
cups_raster_t *r) /* I - Raster stream */
{
size_t len; /* Length for read/swap */
DEBUG_printf(("3_cupsRasterReadHeader(r=%p), r->mode=%s", (void *)r, r ? cups_modes[r->mode] : ""));
if (r == NULL || r->mode != CUPS_RASTER_READ)
return (0);
DEBUG_printf(("4_cupsRasterReadHeader: r->iocount=" CUPS_LLFMT, CUPS_LLCAST r->iocount));
memset(&(r->header), 0, sizeof(r->header));
/*
* Read the header...
*/
switch (r->sync)
{
default :
/*
* Get the length of the raster header...
*/
if (r->sync == CUPS_RASTER_SYNCv1 || r->sync == CUPS_RASTER_REVSYNCv1)
len = sizeof(cups_page_header_t);
else
len = sizeof(cups_page_header2_t);
DEBUG_printf(("4_cupsRasterReadHeader: len=%d", (int)len));
/*
* Read it...
*/
if (cups_raster_read(r, (unsigned char *)&(r->header), len) < (ssize_t)len)
{
DEBUG_printf(("4_cupsRasterReadHeader: EOF, r->iocount=" CUPS_LLFMT, CUPS_LLCAST r->iocount));
return (0);
}
/*
* Swap bytes as needed...
*/
if (r->swapped)
{
unsigned *s, /* Current word */
temp; /* Temporary copy */
DEBUG_puts("4_cupsRasterReadHeader: Swapping header bytes.");
for (len = 81, s = &(r->header.AdvanceDistance);
len > 0;
len --, s ++)
{
temp = *s;
*s = ((temp & 0xff) << 24) |
((temp & 0xff00) << 8) |
((temp & 0xff0000) >> 8) |
((temp & 0xff000000) >> 24);
DEBUG_printf(("4_cupsRasterReadHeader: %08x => %08x", temp, *s));
}
}
break;
case CUPS_RASTER_SYNCapple :
case CUPS_RASTER_REVSYNCapple :
{
unsigned char appleheader[32]; /* Raw header */
static const unsigned rawcspace[] =
{
CUPS_CSPACE_SW,
CUPS_CSPACE_SRGB,
CUPS_CSPACE_CIELab,
CUPS_CSPACE_ADOBERGB,
CUPS_CSPACE_W,
CUPS_CSPACE_RGB,
CUPS_CSPACE_CMYK
};
static const unsigned rawnumcolors[] =
{
1,
3,
3,
3,
1,
3,
4
};
if (cups_raster_read(r, appleheader, sizeof(appleheader)) < (ssize_t)sizeof(appleheader))
{
DEBUG_printf(("4_cupsRasterReadHeader: EOF, r->iocount=" CUPS_LLFMT, CUPS_LLCAST r->iocount));
return (0);
}
strlcpy(r->header.MediaClass, "PwgRaster", sizeof(r->header.MediaClass));
/* PwgRaster */
r->header.cupsBitsPerPixel = appleheader[0];
r->header.cupsColorSpace = appleheader[1] >= (sizeof(rawcspace) / sizeof(rawcspace[0])) ? CUPS_CSPACE_DEVICE1 : rawcspace[appleheader[1]];
r->header.cupsNumColors = appleheader[1] >= (sizeof(rawnumcolors) / sizeof(rawnumcolors[0])) ? 1 : rawnumcolors[appleheader[1]];
r->header.cupsBitsPerColor = r->header.cupsBitsPerPixel / r->header.cupsNumColors;
r->header.cupsWidth = ((((((unsigned)appleheader[12] << 8) | (unsigned)appleheader[13]) << 8) | (unsigned)appleheader[14]) << 8) | (unsigned)appleheader[15];
r->header.cupsHeight = ((((((unsigned)appleheader[16] << 8) | (unsigned)appleheader[17]) << 8) | (unsigned)appleheader[18]) << 8) | (unsigned)appleheader[19];
r->header.cupsBytesPerLine = r->header.cupsWidth * r->header.cupsBitsPerPixel / 8;
r->header.cupsColorOrder = CUPS_ORDER_CHUNKED;
r->header.HWResolution[0] = r->header.HWResolution[1] = ((((((unsigned)appleheader[20] << 8) | (unsigned)appleheader[21]) << 8) | (unsigned)appleheader[22]) << 8) | (unsigned)appleheader[23];
if (r->header.HWResolution[0] > 0)
{
r->header.PageSize[0] = (unsigned)(r->header.cupsWidth * 72 / r->header.HWResolution[0]);
r->header.PageSize[1] = (unsigned)(r->header.cupsHeight * 72 / r->header.HWResolution[1]);
r->header.cupsPageSize[0] = (float)(r->header.cupsWidth * 72.0 / r->header.HWResolution[0]);
r->header.cupsPageSize[1] = (float)(r->header.cupsHeight * 72.0 / r->header.HWResolution[1]);
}
r->header.cupsInteger[CUPS_RASTER_PWG_TotalPageCount] = r->apple_page_count;
r->header.cupsInteger[CUPS_RASTER_PWG_AlternatePrimary] = 0xffffff;
r->header.cupsInteger[CUPS_RASTER_PWG_PrintQuality] = appleheader[3];
if (appleheader[2] >= 2)
r->header.Duplex = 1;
if (appleheader[2] == 2)
r->header.Tumble = 1;
r->header.MediaPosition = appleheader[5];
if (appleheader[4] < (int)(sizeof(apple_media_types) / sizeof(apple_media_types[0])))
strlcpy(r->header.MediaType, apple_media_types[appleheader[4]], sizeof(r->header.MediaType));
else
strlcpy(r->header.MediaType, "other", sizeof(r->header.MediaType));
}
break;
}
/*
* Update the header and row count...
*/
if (!cups_raster_update(r))
return (0);
DEBUG_printf(("4_cupsRasterReadHeader: cupsColorSpace=%s", _cupsRasterColorSpaceString(r->header.cupsColorSpace)));
DEBUG_printf(("4_cupsRasterReadHeader: cupsBitsPerColor=%u", r->header.cupsBitsPerColor));
DEBUG_printf(("4_cupsRasterReadHeader: cupsBitsPerPixel=%u", r->header.cupsBitsPerPixel));
DEBUG_printf(("4_cupsRasterReadHeader: cupsBytesPerLine=%u", r->header.cupsBytesPerLine));
DEBUG_printf(("4_cupsRasterReadHeader: cupsWidth=%u", r->header.cupsWidth));
DEBUG_printf(("4_cupsRasterReadHeader: cupsHeight=%u", r->header.cupsHeight));
DEBUG_printf(("4_cupsRasterReadHeader: r->bpp=%d", r->bpp));
return (r->header.cupsBitsPerPixel > 0 && r->header.cupsBitsPerPixel <= 240 && r->header.cupsBitsPerColor > 0 && r->header.cupsBitsPerColor <= 16 && r->header.cupsBytesPerLine > 0 && r->header.cupsBytesPerLine <= 0x7fffffff && r->header.cupsHeight != 0 && (r->header.cupsBytesPerLine % r->bpp) == 0);
}
/*
* '_cupsRasterReadPixels()' - Read raster pixels.
*
* For best performance, filters should read one or more whole lines.
* The "cupsBytesPerLine" value from the page header can be used to allocate
* the line buffer and as the number of bytes to read.
*/
unsigned /* O - Number of bytes read */
_cupsRasterReadPixels(
cups_raster_t *r, /* I - Raster stream */
unsigned char *p, /* I - Pointer to pixel buffer */
unsigned len) /* I - Number of bytes to read */
{
ssize_t bytes; /* Bytes read */
unsigned cupsBytesPerLine; /* cupsBytesPerLine value */
unsigned remaining; /* Bytes remaining */
unsigned char *ptr, /* Pointer to read buffer */
byte, /* Byte from file */
*temp; /* Pointer into buffer */
unsigned count; /* Repetition count */
DEBUG_printf(("_cupsRasterReadPixels(r=%p, p=%p, len=%u)", (void *)r, (void *)p, len));
if (r == NULL || r->mode != CUPS_RASTER_READ || r->remaining == 0 ||
r->header.cupsBytesPerLine == 0)
{
DEBUG_puts("1_cupsRasterReadPixels: Returning 0.");
return (0);
}
DEBUG_printf(("1_cupsRasterReadPixels: compressed=%d, remaining=%u", r->compressed, r->remaining));
if (!r->compressed)
{
/*
* Read without compression...
*/
r->remaining -= len / r->header.cupsBytesPerLine;
if (cups_raster_io(r, p, len) < (ssize_t)len)
{
DEBUG_puts("1_cupsRasterReadPixels: Read error, returning 0.");
return (0);
}
/*
* Swap bytes as needed...
*/
if (r->swapped &&
(r->header.cupsBitsPerColor == 16 ||
r->header.cupsBitsPerPixel == 12 ||
r->header.cupsBitsPerPixel == 16))
cups_swap(p, len);
/*
* Return...
*/
DEBUG_printf(("1_cupsRasterReadPixels: Returning %u", len));
return (len);
}
/*
* Read compressed data...
*/
remaining = len;
cupsBytesPerLine = r->header.cupsBytesPerLine;
while (remaining > 0 && r->remaining > 0)
{
if (r->count == 0)
{
/*
* Need to read a new row...
*/
if (remaining == cupsBytesPerLine)
ptr = p;
else
ptr = r->pixels;
/*
* Read using a modified PackBits compression...
*/
if (!cups_raster_read(r, &byte, 1))
{
DEBUG_puts("1_cupsRasterReadPixels: Read error, returning 0.");
return (0);
}
r->count = (unsigned)byte + 1;
if (r->count > 1)
ptr = r->pixels;
temp = ptr;
bytes = (ssize_t)cupsBytesPerLine;
while (bytes > 0)
{
/*
* Get a new repeat count...
*/
if (!cups_raster_read(r, &byte, 1))
{
DEBUG_puts("1_cupsRasterReadPixels: Read error, returning 0.");
return (0);
}
if (byte == 128)
{
/*
* Clear to end of line...
*/
switch (r->header.cupsColorSpace)
{
case CUPS_CSPACE_W :
case CUPS_CSPACE_RGB :
case CUPS_CSPACE_SW :
case CUPS_CSPACE_SRGB :
case CUPS_CSPACE_RGBW :
case CUPS_CSPACE_ADOBERGB :
memset(temp, 0xff, (size_t)bytes);
break;
default :
memset(temp, 0x00, (size_t)bytes);
break;
}
temp += bytes;
bytes = 0;
}
else if (byte & 128)
{
/*
* Copy N literal pixels...
*/
count = (unsigned)(257 - byte) * r->bpp;
if (count > (unsigned)bytes)
count = (unsigned)bytes;
if (!cups_raster_read(r, temp, count))
{
DEBUG_puts("1_cupsRasterReadPixels: Read error, returning 0.");
return (0);
}
temp += count;
bytes -= (ssize_t)count;
}
else
{
/*
* Repeat the next N bytes...
*/
count = ((unsigned)byte + 1) * r->bpp;
if (count > (unsigned)bytes)
count = (unsigned)bytes;
if (count < r->bpp)
break;
bytes -= (ssize_t)count;
if (!cups_raster_read(r, temp, r->bpp))
{
DEBUG_puts("1_cupsRasterReadPixels: Read error, returning 0.");
return (0);
}
temp += r->bpp;
count -= r->bpp;
while (count > 0)
{
memcpy(temp, temp - r->bpp, r->bpp);
temp += r->bpp;
count -= r->bpp;
}
}
}
/*
* Swap bytes as needed...
*/
if ((r->header.cupsBitsPerColor == 16 ||
r->header.cupsBitsPerPixel == 12 ||
r->header.cupsBitsPerPixel == 16) &&
r->swapped)
{
DEBUG_puts("1_cupsRasterReadPixels: Swapping bytes.");
cups_swap(ptr, (size_t)cupsBytesPerLine);
}
/*
* Update pointers...
*/
if (remaining >= cupsBytesPerLine)
{
bytes = (ssize_t)cupsBytesPerLine;
r->pcurrent = r->pixels;
r->count --;
r->remaining --;
}
else
{
bytes = (ssize_t)remaining;
r->pcurrent = r->pixels + bytes;
}
/*
* Copy data as needed...
*/
if (ptr != p)
memcpy(p, ptr, (size_t)bytes);
}
else
{
/*
* Copy fragment from buffer...
*/
if ((unsigned)(bytes = (int)(r->pend - r->pcurrent)) > remaining)
bytes = (ssize_t)remaining;
memcpy(p, r->pcurrent, (size_t)bytes);
r->pcurrent += bytes;
if (r->pcurrent >= r->pend)
{
r->pcurrent = r->pixels;
r->count --;
r->remaining --;
}
}
remaining -= (unsigned)bytes;
p += bytes;
}
DEBUG_printf(("1_cupsRasterReadPixels: Returning %u", len));
return (len);
}