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epdfinfo.c
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epdfinfo.c
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/* Copyright (C) 2013, 2014 Andreas Politz
*
* Author: Andreas Politz <politza@fh-trier.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <assert.h>
#ifdef HAVE_ERR_H
# include <err.h>
#endif
#ifdef HAVE_ERROR_H
# include <error.h>
#endif
#include <glib.h>
#include <poppler.h>
#include <cairo.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <png.h>
#include <math.h>
#include <regex.h>
#include "synctex_parser.h"
#include "epdfinfo.h"
/* ================================================================== *
* Helper Functions
* ================================================================== */
#ifndef HAVE_ERR_H
/**
* Print error message and quit.
*
* @param eval Return code
* @param fmt Formatting string
*/
static void
err(int eval, const char *fmt, ...)
{
va_list args;
fprintf (stderr, "epdfinfo: ");
if (fmt != NULL)
{
va_start (args, fmt);
vfprintf (stderr, fmt, args);
va_end (args);
fprintf (stderr, ": %s\n", strerror(errno));
}
else
{
fprintf (stderr, "\n");
}
fflush (stderr);
exit (eval);
}
#endif
#ifndef HAVE_GETLINE
/**
* Read one line from a file.
*
* @param lineptr Pointer to malloc() allocated buffer
* @param n Pointer to size of buffer
* @param stream File pointer to read from
*/
static ssize_t
getline(char **lineptr, size_t *n, FILE *stream)
{
size_t len = 0;
int ch;
if ((lineptr == NULL) || (n == NULL))
{
errno = EINVAL;
return -1;
}
if (*lineptr == NULL)
{
*lineptr = malloc (128);
*n = 128;
}
while ((ch = fgetc (stream)) != EOF)
{
(*lineptr)[len] = ch;
if (++len >= *n)
{
*n += 128;
*lineptr = realloc (*lineptr, *n);
}
if (ch == '\n')
break;
}
(*lineptr)[len] = '\0';
if (!len)
{
len = -1;
}
return len;
}
#endif
/**
* Free a list of command arguments.
*
* @param args An array of command arguments.
* @param n The length of the array.
*/
static void
free_command_args (command_arg_t *args, size_t n)
{
if (! args)
return;
g_free (args);
}
/**
* Free resources held by document.
*
* @param doc The document to be freed.
*/
static void
free_document (document_t *doc)
{
if (! doc)
return;
g_free (doc->filename);
g_free (doc->passwd);
if (doc->annotations.pages)
{
int npages = poppler_document_get_n_pages (doc->pdf);
int i;
for (i = 0; i < npages; ++i)
{
GList *item;
GList *annots = doc->annotations.pages[i];
for (item = annots; item; item = item->next)
{
annotation_t *a = (annotation_t*) item->data;
poppler_annot_mapping_free(a->amap);
g_free (a->key);
g_free (a);
}
g_list_free (annots);
}
g_hash_table_destroy (doc->annotations.keys);
g_free (doc->annotations.pages);
}
g_object_unref (doc->pdf);
g_free (doc);
}
/**
* Parse a list of whitespace separated double values.
*
* @param str The input string.
* @param values[out] Values are put here.
* @param nvalues How many values to parse.
*
* @return TRUE, if str contained exactly nvalues, else FALSE.
*/
static gboolean
parse_double_list (const char *str, gdouble *values, size_t nvalues)
{
char *end;
int i;
if (! str)
return FALSE;
errno = 0;
for (i = 0; i < nvalues; ++i)
{
gdouble n = g_ascii_strtod (str, &end);
if (str == end || errno)
return FALSE;
values[i] = n;
str = end;
}
if (*end)
return FALSE;
return TRUE;
}
static gboolean
parse_rectangle (const char *str, PopplerRectangle *r)
{
gdouble values[4];
if (! r)
return FALSE;
if (! parse_double_list (str, values, 4))
return FALSE;
r->x1 = values[0];
r->y1 = values[1];
r->x2 = values[2];
r->y2 = values[3];
return TRUE;
}
static gboolean
parse_edges_or_position (const char *str, PopplerRectangle *r)
{
return (parse_rectangle (str, r)
&& r->x1 >= 0 && r->x1 <= 1
&& r->x2 <= 1
&& r->y1 >= 0 && r->y1 <= 1
&& r->y2 <= 1);
}
static gboolean
parse_edges (const char *str, PopplerRectangle *r)
{
return (parse_rectangle (str, r)
&& r->x1 >= 0 && r->x1 <= 1
&& r->x2 >= 0 && r->x2 <= 1
&& r->y1 >= 0 && r->y1 <= 1
&& r->y2 >= 0 && r->y2 <= 1);
}
/**
* Print a string properly escaped for a response.
*
* @param str The string to be printed.
* @param suffix_char Append a newline if NEWLINE, a colon if COLON.
*/
static void
print_response_string (const char *str, enum suffix_char suffix)
{
if (str)
{
while (*str)
{
switch (*str)
{
case '\n':
printf ("\\n");
break;
case '\\':
printf ("\\\\");
break;
case ':':
printf ("\\:");
break;
default:
putchar (*str);
}
++str;
}
}
switch (suffix)
{
case NEWLINE:
putchar ('\n');
break;
case COLON:
putchar (':');
break;
default: ;
}
}
/**
* Print a formatted error response.
*
* @param fmt The printf-like format string.
*/
static void
printf_error_response (const char *fmt, ...)
{
va_list va;
puts ("ERR");
va_start (va, fmt);
vprintf (fmt, va);
va_end (va);
puts ("\n.");
fflush (stdout);
}
/**
* Remove one trailing newline character. Does nothing, if str does
* not end with a newline.
*
* @param str The string.
*
* @return str with trailing newline removed.
*/
static char*
strchomp (char *str)
{
size_t length;
if (! str)
return str;
length = strlen (str);
if (str[length - 1] == '\n')
str[length - 1] = '\0';
return str;
}
/**
* Create a new, temporary file and returns its name.
*
* @return The filename.
*/
static char*
mktempfile()
{
char *filename = NULL;
int tries = 3;
while (! filename && tries-- > 0)
{
filename = tempnam(NULL, "epdfinfo");
if (filename)
{
int fd = open(filename, O_CREAT | O_EXCL | O_RDONLY, S_IRWXU);
if (fd > 0)
close (fd);
else
{
free (filename);
filename = NULL;
}
}
}
if (! filename)
fprintf (stderr, "Unable to create tempfile");
return filename;
}
static void
image_recolor (cairo_surface_t * surface, const PopplerColor * fg,
const PopplerColor * bg)
{
/* uses a representation of a rgb color as follows:
- a lightness scalar (between 0,1), which is a weighted average of r, g, b,
- a hue vector, which indicates a radian direction from the grey axis,
inside the equal lightness plane.
- a saturation scalar between 0,1. It is 0 when grey, 1 when the color is
in the boundary of the rgb cube.
*/
const unsigned int page_width = cairo_image_surface_get_width (surface);
const unsigned int page_height = cairo_image_surface_get_height (surface);
const int rowstride = cairo_image_surface_get_stride (surface);
unsigned char *image = cairo_image_surface_get_data (surface);
/* RGB weights for computing lightness. Must sum to one */
static const double a[] = { 0.30, 0.59, 0.11 };
const double f = 65535.;
const double rgb_fg[] = {
fg->red / f, fg->green / f, fg->blue / f
};
const double rgb_bg[] = {
bg->red / f, bg->green / f, bg->blue / f
};
const double rgb_diff[] = {
rgb_bg[0] - rgb_fg[0],
rgb_bg[1] - rgb_fg[1],
rgb_bg[2] - rgb_fg[2]
};
unsigned int y;
for (y = 0; y < page_height * rowstride; y += rowstride)
{
unsigned char *data = image + y;
unsigned int x;
for (x = 0; x < page_width; x++, data += 4)
{
/* Careful. data color components blue, green, red. */
const double rgb[3] = {
(double) data[2] / 256.,
(double) data[1] / 256.,
(double) data[0] / 256.
};
/* compute h, s, l data */
double l = a[0] * rgb[0] + a[1] * rgb[1] + a[2] * rgb[2];
/* linear interpolation between dark and light with color ligtness as
* a parameter */
data[2] =
(unsigned char) round (255. * (l * rgb_diff[0] + rgb_fg[0]));
data[1] =
(unsigned char) round (255. * (l * rgb_diff[1] + rgb_fg[1]));
data[0] =
(unsigned char) round (255. * (l * rgb_diff[2] + rgb_fg[2]));
}
}
}
/**
* Render a PDF page.
*
* @param pdf The PDF document.
* @param page The page to be rendered.
* @param width The desired width of the image.
*
* @return A cairo_t context encapsulating the rendered image, or
* NULL, if rendering failed for some reason.
*/
static cairo_surface_t*
image_render_page(PopplerDocument *pdf, PopplerPage *page,
int width, gboolean do_render_annotaions,
const render_options_t *options)
{
cairo_t *cr = NULL;
cairo_surface_t *surface = NULL;
double pt_width, pt_height;
int height;
double scale = 1;
if (! page || ! pdf)
return NULL;
if (width < 1)
width = 1;
poppler_page_get_size (page, &pt_width, &pt_height);
scale = width / pt_width;
height = (int) ((scale * pt_height) + 0.5);
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
width, height);
if (cairo_surface_status (surface) != CAIRO_STATUS_SUCCESS)
{
fprintf (stderr, "Failed to create cairo surface\n");
goto error;
}
cr = cairo_create (surface);
if (cairo_status(cr) != CAIRO_STATUS_SUCCESS)
{
fprintf (stderr, "Failed to create cairo handle\n");
goto error;
}
cairo_translate (cr, 0, 0);
cairo_scale (cr, scale, scale);
/* Render w/o annotations. */
if (! do_render_annotaions || (options && options->printed))
poppler_page_render_for_printing_with_options
(page, cr, POPPLER_PRINT_DOCUMENT);
else
poppler_page_render (page, cr) ;
if (cairo_status(cr) != CAIRO_STATUS_SUCCESS)
{
fprintf (stderr, "Failed to render page\n");
goto error;
}
/* This makes the colors look right. */
cairo_set_operator (cr, CAIRO_OPERATOR_DEST_OVER);
cairo_set_source_rgb (cr, 1., 1., 1.);
cairo_paint (cr);
if (options && options->usecolors)
image_recolor (surface, &options->fg, &options->bg);
cairo_destroy (cr);
return surface;
error:
if (surface != NULL)
cairo_surface_destroy (surface);
if (cr != NULL)
cairo_destroy (cr);
return NULL;
}
/**
* Write an image to a filename.
*
* @param cr The cairo context encapsulating the image.
* @param filename The filename to be written to.
* @param type The desired image type.
*
* @return 1 if the image was written successfully, else 0.
*/
static gboolean
image_write (cairo_surface_t *surface, const char *filename, enum image_type type)
{
int i, j;
unsigned char *data;
int width, height;
FILE *file = NULL;
gboolean success = 0;
if (! surface ||
cairo_surface_status(surface) != CAIRO_STATUS_SUCCESS)
{
fprintf (stderr, "Invalid cairo surface\n");
return 0;
}
if (! (file = fopen (filename, "wb")))
{
fprintf (stderr, "Can not open file: %s\n", filename);
return 0;
}
cairo_surface_flush (surface);
width = cairo_image_surface_get_width (surface);
height = cairo_image_surface_get_height (surface);
data = cairo_image_surface_get_data (surface);
switch (type)
{
case PPM:
{
unsigned char *buffer = g_malloc (width * height * 3);
unsigned char *buffer_p = buffer;
fprintf (file, "P6\n%d %d\n255\n", width, height);
for (i = 0; i < width * height; ++i, data += 4, buffer_p += 3)
ARGB_TO_RGB (buffer_p, data);
fwrite (buffer, 1, width * height * 3, file);
g_free (buffer);
success = 1;
}
break;
case PNG:
{
png_infop info_ptr = NULL;
png_structp png_ptr = NULL;
unsigned char *row = NULL;
png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr)
goto finalize;
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
goto finalize;
if (setjmp(png_jmpbuf(png_ptr)))
goto finalize;
png_init_io (png_ptr, file);
png_set_compression_level (png_ptr, 1);
png_set_IHDR (png_ptr, info_ptr, width, height,
8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_BASE,
PNG_FILTER_TYPE_DEFAULT);
png_set_filter (png_ptr, PNG_FILTER_TYPE_BASE,
PNG_FILTER_NONE);
png_write_info (png_ptr, info_ptr);
row = g_malloc (3 * width);
for (i = 0; i < height; ++i)
{
unsigned char *row_p = row;
for (j = 0; j < width; ++j, data += 4, row_p += 3)
{
ARGB_TO_RGB (row_p, data);
}
png_write_row (png_ptr, row);
}
png_write_end (png_ptr, NULL);
success = 1;
finalize:
if (png_ptr)
png_destroy_write_struct (&png_ptr, &info_ptr);
if (row)
g_free (row);
if (! success)
fprintf (stderr, "Error writing png data\n");
}
break;
default:
internal_error ("switch fell through");
}
fclose (file);
return success;
}
static void
image_write_print_response(cairo_surface_t *surface, enum image_type type)
{
char *filename = mktempfile ();
perror_if_not (filename, "Unable to create temporary file");
if (image_write (surface, filename, type))
{
OK_BEGIN ();
print_response_string (filename, NEWLINE);
OK_END ();
}
else
{
printf_error_response ("Unable to write image");
}
free (filename);
error:
return;
}
static void
region_print (cairo_region_t *region, double width, double height)
{
int i;
for (i = 0; i < cairo_region_num_rectangles (region); ++i)
{
cairo_rectangle_int_t r;
cairo_region_get_rectangle (region, i, &r);
printf ("%f %f %f %f",
r.x / width,
r.y / height,
(r.x + r.width) / width,
(r.y + r.height) / height);
if (i < cairo_region_num_rectangles (region) - 1)
putchar (':');
}
if (0 == cairo_region_num_rectangles (region))
printf ("0.0 0.0 0.0 0.0");
}
/**
* Return a string representation of a PopplerActionType.
*
* @param type The PopplerActionType.
*
* @return Its string representation.
*/
static const char *
xpoppler_action_type_string(PopplerActionType type)
{
switch (type)
{
case POPPLER_ACTION_UNKNOWN: return "unknown";
case POPPLER_ACTION_NONE: return "none";
case POPPLER_ACTION_GOTO_DEST: return "goto-dest";
case POPPLER_ACTION_GOTO_REMOTE: return "goto-remote";
case POPPLER_ACTION_LAUNCH: return "launch";
case POPPLER_ACTION_URI: return "uri";
case POPPLER_ACTION_NAMED: return "goto-dest"; /* actually "named" */
case POPPLER_ACTION_MOVIE: return "movie";
case POPPLER_ACTION_RENDITION: return "rendition";
case POPPLER_ACTION_OCG_STATE: return "ocg-state";
case POPPLER_ACTION_JAVASCRIPT: return "javascript";
default: return "invalid";
}
}
/**
* Return a string representation of a PopplerAnnotType.
*
* @param type The PopplerAnnotType.
*
* @return Its string representation.
*/
static const char *
xpoppler_annot_type_string (PopplerAnnotType type)
{
switch (type)
{
case POPPLER_ANNOT_UNKNOWN: return "unknown";
case POPPLER_ANNOT_TEXT: return "text";
case POPPLER_ANNOT_LINK: return "link";
case POPPLER_ANNOT_FREE_TEXT: return "free-text";
case POPPLER_ANNOT_LINE: return "line";
case POPPLER_ANNOT_SQUARE: return "square";
case POPPLER_ANNOT_CIRCLE: return "circle";
case POPPLER_ANNOT_POLYGON: return "polygon";
case POPPLER_ANNOT_POLY_LINE: return "poly-line";
case POPPLER_ANNOT_HIGHLIGHT: return "highlight";
case POPPLER_ANNOT_UNDERLINE: return "underline";
case POPPLER_ANNOT_SQUIGGLY: return "squiggly";
case POPPLER_ANNOT_STRIKE_OUT: return "strike-out";
case POPPLER_ANNOT_STAMP: return "stamp";
case POPPLER_ANNOT_CARET: return "caret";
case POPPLER_ANNOT_INK: return "ink";
case POPPLER_ANNOT_POPUP: return "popup";
case POPPLER_ANNOT_FILE_ATTACHMENT: return "file";
case POPPLER_ANNOT_SOUND: return "sound";
case POPPLER_ANNOT_MOVIE: return "movie";
case POPPLER_ANNOT_WIDGET: return "widget";
case POPPLER_ANNOT_SCREEN: return "screen";
case POPPLER_ANNOT_PRINTER_MARK: return "printer-mark";
case POPPLER_ANNOT_TRAP_NET: return "trap-net";
case POPPLER_ANNOT_WATERMARK: return "watermark";
case POPPLER_ANNOT_3D: return "3d";
default: return "invalid";
}
}
/**
* Return a string representation of a PopplerAnnotTextState.
*
* @param type The PopplerAnnotTextState.
*
* @return Its string representation.
*/
static const char *
xpoppler_annot_text_state_string (PopplerAnnotTextState state)
{
switch (state)
{
case POPPLER_ANNOT_TEXT_STATE_MARKED: return "marked";
case POPPLER_ANNOT_TEXT_STATE_UNMARKED: return "unmarked";
case POPPLER_ANNOT_TEXT_STATE_ACCEPTED: return "accepted";
case POPPLER_ANNOT_TEXT_STATE_REJECTED: return "rejected";
case POPPLER_ANNOT_TEXT_STATE_CANCELLED: return "cancelled";
case POPPLER_ANNOT_TEXT_STATE_COMPLETED: return "completed";
case POPPLER_ANNOT_TEXT_STATE_NONE: return "none";
case POPPLER_ANNOT_TEXT_STATE_UNKNOWN:
default: return "unknown";
}
};
static document_t*
document_open (const epdfinfo_t *ctx, const char *filename,
const char *passwd, GError **gerror)
{
char *uri;
document_t *doc = g_hash_table_lookup (ctx->documents, filename);
if (NULL != doc)
return doc;
doc = g_malloc0(sizeof (document_t));
uri = g_filename_to_uri (filename, NULL, gerror);
if (uri != NULL)
doc->pdf = poppler_document_new_from_file(uri, passwd, gerror);
if (NULL == doc->pdf)
{
g_free (doc);
doc = NULL;
}
else
{
doc->filename = g_strdup (filename);
doc->passwd = g_strdup (passwd);
g_hash_table_insert (ctx->documents, doc->filename, doc);
}
g_free (uri);
return doc;
}
/**
* Split command args into a list of strings.
*
* @param args The colon separated list of arguments.
* @param nargs[out] The number of returned arguments.
*
* @return The list of arguments, which should be freed by the caller.
*/
static char **
command_arg_split (const char *args, int *nargs)
{
char **list = g_malloc (sizeof (char*) * 16);
int i = 0;
size_t allocated = 16;
char *buffer = NULL;
gboolean last = FALSE;
if (! args)
goto theend;
buffer = g_malloc (strlen (args) + 1);
while (*args || last)
{
gboolean esc = FALSE;
char *buffer_p = buffer;
while (*args && (*args != ':' || esc))
{
if (esc)
{
if (*args == 'n')
{
++args;
*buffer_p++ = '\n';
}
else
{
*buffer_p++ = *args++;
}
esc = FALSE;
}
else if (*args == '\\')
{
++args;
esc = TRUE;
}
else
{
*buffer_p++ = *args++;
}
}
*buffer_p = '\0';
if (i >= allocated)
{
allocated = 2 * allocated + 1;
list = g_realloc (list, sizeof (char*) * allocated);
}
list[i++] = g_strdup (buffer);
last = FALSE;
if (*args)
{
++args;
if (! *args)
last = TRUE;
}
}
theend:
g_free (buffer);
*nargs = i;
return list;
}
static gboolean
command_arg_parse_arg (const epdfinfo_t *ctx, const char *arg,
command_arg_t *cmd_arg, command_arg_type_t type,
gchar **error_msg)
{
GError *gerror = NULL;
if (! arg || !cmd_arg)
return FALSE;
switch (type)
{
case ARG_DOC:
{
document_t *doc = document_open (ctx, arg, NULL, &gerror);
cerror_if_not (doc, error_msg,
"Error opening %s:%s", arg,
gerror ? gerror->message : "Unknown reason");
cmd_arg->value.doc = doc;
break;
}
case ARG_BOOL:
cerror_if_not (! strcmp (arg, "0") || ! strcmp (arg, "1"),
error_msg, "Expected 0 or 1:%s", arg);
cmd_arg->value.flag = *arg == '1';
break;
case ARG_NONEMPTY_STRING:
cerror_if_not (*arg, error_msg, "Non-empty string expected");
/* fall through */
case ARG_STRING:
cmd_arg->value.string = arg;
break;
case ARG_NATNUM:
{
char *endptr;
long n = strtol (arg, &endptr, 0);
cerror_if_not (! (*endptr || (n < 0)), error_msg,
"Expected natural number:%s", arg);
cmd_arg->value.natnum = n;
}
break;
case ARG_EDGES_OR_POSITION:
{
PopplerRectangle *r = &cmd_arg->value.rectangle;
cerror_if_not (parse_edges_or_position (arg, r),
error_msg,
"Expected a relative position or rectangle: %s", arg);
}
break;
case ARG_EDGES:
{
PopplerRectangle *r = &cmd_arg->value.rectangle;
cerror_if_not (parse_edges (arg, r),
error_msg,
"Expected a relative rectangle: %s", arg);
}
break;
case ARG_EDGE_OR_NEGATIVE:
case ARG_EDGE:
{
char *endptr;
double n = strtod (arg, &endptr);
cerror_if_not (! (*endptr || (type != ARG_EDGE_OR_NEGATIVE && n < 0.0) || n > 1.0),
error_msg, "Expected a relative edge: %s", arg);
cmd_arg->value.edge = n;
}
break;
case ARG_COLOR:
{
guint r,g,b;
cerror_if_not ((strlen (arg) == 7
&& 3 == sscanf (arg, "#%2x%2x%2x", &r, &g, &b)),
error_msg, "Invalid color: %s", arg);
cmd_arg->value.color.red = r << 8;
cmd_arg->value.color.green = g << 8;
cmd_arg->value.color.blue = b << 8;
}
break;
case ARG_INVALID:
default:
internal_error ("switch fell through");
}
cmd_arg->type = type;
return TRUE;
error:
if (gerror)
{
g_error_free (gerror);
gerror = NULL;
}
return FALSE;
}
/**
* Parse arguments for a command.
*
* @param ctx The epdfinfo context.
* @param args A string holding the arguments. This is either empty
* or the suffix of the command starting at the first
* colon after the command name.
* @param len The length of args.
* @param cmd The command for which the arguments should be parsed.
*
* @return
*/
static command_arg_t*
command_arg_parse(epdfinfo_t *ctx, char **args, int nargs,
const command_t *cmd, gchar **error_msg)
{
command_arg_t *cmd_args = g_malloc0 (cmd->nargs * sizeof (command_arg_t));
int i;
if (nargs < cmd->nargs - 1
|| (nargs == cmd->nargs - 1
&& cmd->args_spec[cmd->nargs - 1] != ARG_REST)
|| (nargs > cmd->nargs
&& (cmd->nargs == 0
|| cmd->args_spec[cmd->nargs - 1] != ARG_REST)))
{
if (error_msg)
{
*error_msg =
g_strdup_printf ("Command `%s' expects %d argument(s), %d given",
cmd->name, cmd->nargs, nargs);
}
goto failure;
}