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eBookReaderSwitch/mupdf/source/pdf/pdf-interpret.c

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#include "mupdf/fitz.h"
#include "mupdf/pdf.h"
#include <string.h>
#include <math.h>
/* Maximum number of errors before aborting */
#define MAX_SYNTAX_ERRORS 100
void *
pdf_new_processor(fz_context *ctx, int size)
{
return Memento_label(fz_calloc(ctx, 1, size), "pdf_processor");
}
void
pdf_close_processor(fz_context *ctx, pdf_processor *proc)
{
if (proc && proc->close_processor)
{
proc->close_processor(ctx, proc);
proc->close_processor = NULL;
}
}
void
pdf_drop_processor(fz_context *ctx, pdf_processor *proc)
{
if (proc)
{
if (proc->close_processor)
fz_warn(ctx, "dropping unclosed PDF processor");
if (proc->drop_processor)
proc->drop_processor(ctx, proc);
}
fz_free(ctx, proc);
}
static void
pdf_init_csi(fz_context *ctx, pdf_csi *csi, pdf_document *doc, pdf_obj *rdb, pdf_lexbuf *buf, fz_cookie *cookie)
{
memset(csi, 0, sizeof *csi);
csi->doc = doc;
csi->rdb = rdb;
csi->buf = buf;
csi->cookie = cookie;
}
static void
pdf_clear_stack(fz_context *ctx, pdf_csi *csi)
{
int i;
pdf_drop_obj(ctx, csi->obj);
csi->obj = NULL;
csi->name[0] = 0;
csi->string_len = 0;
for (i = 0; i < csi->top; i++)
csi->stack[i] = 0;
csi->top = 0;
}
static pdf_font_desc *
pdf_try_load_font(fz_context *ctx, pdf_document *doc, pdf_obj *rdb, pdf_obj *font, fz_cookie *cookie)
{
pdf_font_desc *desc = NULL;
fz_try(ctx)
desc = pdf_load_font(ctx, doc, rdb, font);
fz_catch(ctx)
{
if (fz_caught(ctx) == FZ_ERROR_TRYLATER)
if (cookie)
cookie->incomplete++;
}
if (desc == NULL)
desc = pdf_load_hail_mary_font(ctx, doc);
return desc;
}
static fz_image *
parse_inline_image(fz_context *ctx, pdf_csi *csi, fz_stream *stm, char *csname, int cslen)
{
pdf_document *doc = csi->doc;
pdf_obj *rdb = csi->rdb;
pdf_obj *obj = NULL;
pdf_obj *cs;
fz_image *img = NULL;
int ch, found;
fz_var(obj);
fz_var(img);
fz_try(ctx)
{
obj = pdf_parse_dict(ctx, doc, stm, &doc->lexbuf.base);
if (csname)
{
cs = pdf_dict_get(ctx, obj, PDF_NAME(CS));
if (!pdf_is_indirect(ctx, cs) && pdf_is_name(ctx, cs))
fz_strlcpy(csname, pdf_to_name(ctx, cs), cslen);
else
csname[0] = 0;
}
/* read whitespace after ID keyword */
ch = fz_read_byte(ctx, stm);
if (ch == '\r')
if (fz_peek_byte(ctx, stm) == '\n')
fz_read_byte(ctx, stm);
img = pdf_load_inline_image(ctx, doc, rdb, obj, stm);
/* find EI */
found = 0;
ch = fz_read_byte(ctx, stm);
do
{
while (ch != 'E' && ch != EOF)
ch = fz_read_byte(ctx, stm);
if (ch == 'E')
{
ch = fz_read_byte(ctx, stm);
if (ch == 'I')
{
ch = fz_peek_byte(ctx, stm);
if (ch == ' ' || ch <= 32 || ch == EOF || ch == '<' || ch == '/')
{
found = 1;
break;
}
}
}
} while (ch != EOF);
if (!found)
fz_throw(ctx, FZ_ERROR_SYNTAX, "syntax error after inline image");
}
fz_always(ctx)
{
pdf_drop_obj(ctx, obj);
}
fz_catch(ctx)
{
fz_drop_image(ctx, img);
fz_rethrow(ctx);
}
return img;
}
static void
pdf_process_extgstate(fz_context *ctx, pdf_processor *proc, pdf_csi *csi, pdf_obj *dict)
{
pdf_obj *obj;
obj = pdf_dict_get(ctx, dict, PDF_NAME(LW));
if (pdf_is_number(ctx, obj) && proc->op_w)
proc->op_w(ctx, proc, pdf_to_real(ctx, obj));
obj = pdf_dict_get(ctx, dict, PDF_NAME(LC));
if (pdf_is_int(ctx, obj) && proc->op_J)
proc->op_J(ctx, proc, fz_clampi(pdf_to_int(ctx, obj), 0, 2));
obj = pdf_dict_get(ctx, dict, PDF_NAME(LJ));
if (pdf_is_int(ctx, obj) && proc->op_j)
proc->op_j(ctx, proc, fz_clampi(pdf_to_int(ctx, obj), 0, 2));
obj = pdf_dict_get(ctx, dict, PDF_NAME(ML));
if (pdf_is_number(ctx, obj) && proc->op_M)
proc->op_M(ctx, proc, pdf_to_real(ctx, obj));
obj = pdf_dict_get(ctx, dict, PDF_NAME(D));
if (pdf_is_array(ctx, obj) && proc->op_d)
{
pdf_obj *dash_array = pdf_array_get(ctx, obj, 0);
pdf_obj *dash_phase = pdf_array_get(ctx, obj, 1);
proc->op_d(ctx, proc, dash_array, pdf_to_real(ctx, dash_phase));
}
obj = pdf_dict_get(ctx, dict, PDF_NAME(RI));
if (pdf_is_name(ctx, obj) && proc->op_ri)
proc->op_ri(ctx, proc, pdf_to_name(ctx, obj));
obj = pdf_dict_get(ctx, dict, PDF_NAME(FL));
if (pdf_is_number(ctx, obj) && proc->op_i)
proc->op_i(ctx, proc, pdf_to_real(ctx, obj));
obj = pdf_dict_get(ctx, dict, PDF_NAME(Font));
if (pdf_is_array(ctx, obj) && proc->op_Tf)
{
pdf_obj *font_ref = pdf_array_get(ctx, obj, 0);
pdf_obj *font_size = pdf_array_get(ctx, obj, 1);
pdf_font_desc *font;
if (pdf_is_dict(ctx, font_ref))
font = pdf_try_load_font(ctx, csi->doc, csi->rdb, font_ref, csi->cookie);
else
font = pdf_load_hail_mary_font(ctx, csi->doc);
fz_try(ctx)
proc->op_Tf(ctx, proc, "ExtGState", font, pdf_to_real(ctx, font_size));
fz_always(ctx)
pdf_drop_font(ctx, font);
fz_catch(ctx)
fz_rethrow(ctx);
}
/* overprint and color management */
obj = pdf_dict_get(ctx, dict, PDF_NAME(OP));
if (pdf_is_bool(ctx, obj) && proc->op_gs_OP)
proc->op_gs_OP(ctx, proc, pdf_to_bool(ctx, obj));
obj = pdf_dict_get(ctx, dict, PDF_NAME(op));
if (pdf_is_bool(ctx, obj) && proc->op_gs_op)
proc->op_gs_op(ctx, proc, pdf_to_bool(ctx, obj));
obj = pdf_dict_get(ctx, dict, PDF_NAME(OPM));
if (pdf_is_int(ctx, obj) && proc->op_gs_OPM)
proc->op_gs_OPM(ctx, proc, pdf_to_int(ctx, obj));
obj = pdf_dict_get(ctx, dict, PDF_NAME(UseBlackPtComp));
if (pdf_is_name(ctx, obj) && proc->op_gs_UseBlackPtComp)
proc->op_gs_UseBlackPtComp(ctx, proc, obj);
/* transfer functions */
obj = pdf_dict_get(ctx, dict, PDF_NAME(TR2));
if (pdf_is_name(ctx, obj))
if (!pdf_name_eq(ctx, obj, PDF_NAME(Identity)) && !pdf_name_eq(ctx, obj, PDF_NAME(Default)))
fz_warn(ctx, "ignoring transfer function");
if (!obj) /* TR is ignored in the presence of TR2 */
{
pdf_obj *tr = pdf_dict_get(ctx, dict, PDF_NAME(TR));
if (pdf_is_name(ctx, tr))
if (!pdf_name_eq(ctx, tr, PDF_NAME(Identity)))
fz_warn(ctx, "ignoring transfer function");
}
/* transparency state */
obj = pdf_dict_get(ctx, dict, PDF_NAME(CA));
if (pdf_is_number(ctx, obj) && proc->op_gs_CA)
proc->op_gs_CA(ctx, proc, pdf_to_real(ctx, obj));
obj = pdf_dict_get(ctx, dict, PDF_NAME(ca));
if (pdf_is_number(ctx, obj) && proc->op_gs_ca)
proc->op_gs_ca(ctx, proc, pdf_to_real(ctx, obj));
obj = pdf_dict_get(ctx, dict, PDF_NAME(BM));
if (pdf_is_array(ctx, obj))
obj = pdf_array_get(ctx, obj, 0);
if (pdf_is_name(ctx, obj) && proc->op_gs_BM)
proc->op_gs_BM(ctx, proc, pdf_to_name(ctx, obj));
obj = pdf_dict_get(ctx, dict, PDF_NAME(SMask));
if (proc->op_gs_SMask)
{
if (pdf_is_dict(ctx, obj))
{
pdf_obj *xobj, *s, *bc, *tr;
float softmask_bc[FZ_MAX_COLORS];
fz_colorspace *colorspace;
int colorspace_n = 1;
int k, luminosity;
xobj = pdf_dict_get(ctx, obj, PDF_NAME(G));
colorspace = pdf_xobject_colorspace(ctx, xobj);
if (colorspace)
colorspace_n = fz_colorspace_n(ctx, colorspace);
/* Default background color is black. */
for (k = 0; k < colorspace_n; k++)
softmask_bc[k] = 0;
/* Which in CMYK means not all zeros! This should really be
* a test for subtractive color spaces, but this will have
* to do for now. */
if (fz_colorspace_is_cmyk(ctx, colorspace))
softmask_bc[3] = 1.0f;
fz_drop_colorspace(ctx, colorspace);
bc = pdf_dict_get(ctx, obj, PDF_NAME(BC));
if (pdf_is_array(ctx, bc))
{
for (k = 0; k < colorspace_n; k++)
softmask_bc[k] = pdf_array_get_real(ctx, bc, k);
}
s = pdf_dict_get(ctx, obj, PDF_NAME(S));
if (pdf_name_eq(ctx, s, PDF_NAME(Luminosity)))
luminosity = 1;
else
luminosity = 0;
tr = pdf_dict_get(ctx, obj, PDF_NAME(TR));
if (tr && !pdf_name_eq(ctx, tr, PDF_NAME(Identity)))
fz_warn(ctx, "ignoring transfer function");
proc->op_gs_SMask(ctx, proc, xobj, csi->rdb, softmask_bc, luminosity);
}
else if (pdf_is_name(ctx, obj) && pdf_name_eq(ctx, obj, PDF_NAME(None)))
{
proc->op_gs_SMask(ctx, proc, NULL, NULL, NULL, 0);
}
}
}
static void
pdf_process_Do(fz_context *ctx, pdf_processor *proc, pdf_csi *csi)
{
pdf_obj *xres, *xobj, *subtype;
xres = pdf_dict_get(ctx, csi->rdb, PDF_NAME(XObject));
xobj = pdf_dict_gets(ctx, xres, csi->name);
if (!xobj)
fz_throw(ctx, FZ_ERROR_MINOR, "cannot find XObject resource '%s'", csi->name);
subtype = pdf_dict_get(ctx, xobj, PDF_NAME(Subtype));
if (pdf_name_eq(ctx, subtype, PDF_NAME(Form)))
{
pdf_obj *st = pdf_dict_get(ctx, xobj, PDF_NAME(Subtype2));
if (st)
subtype = st;
}
if (!pdf_is_name(ctx, subtype))
fz_throw(ctx, FZ_ERROR_MINOR, "no XObject subtype specified");
if (pdf_is_hidden_ocg(ctx, csi->doc->ocg, csi->rdb, proc->usage, pdf_dict_get(ctx, xobj, PDF_NAME(OC))))
return;
if (pdf_name_eq(ctx, subtype, PDF_NAME(Form)))
{
if (proc->op_Do_form)
proc->op_Do_form(ctx, proc, csi->name, xobj, csi->rdb);
}
else if (pdf_name_eq(ctx, subtype, PDF_NAME(Image)))
{
if (proc->op_Do_image)
{
fz_image *image = pdf_load_image(ctx, csi->doc, xobj);
fz_try(ctx)
proc->op_Do_image(ctx, proc, csi->name, image);
fz_always(ctx)
fz_drop_image(ctx, image);
fz_catch(ctx)
fz_rethrow(ctx);
}
}
else if (!strcmp(pdf_to_name(ctx, subtype), "PS"))
fz_warn(ctx, "ignoring XObject with subtype PS");
else
fz_warn(ctx, "ignoring XObject with unknown subtype: '%s'", pdf_to_name(ctx, subtype));
}
static void
pdf_process_CS(fz_context *ctx, pdf_processor *proc, pdf_csi *csi, int stroke)
{
if (!proc->op_CS || !proc->op_cs)
return;
if (!strcmp(csi->name, "Pattern"))
{
if (stroke)
proc->op_CS(ctx, proc, "Pattern", NULL);
else
proc->op_cs(ctx, proc, "Pattern", NULL);
}
else
{
fz_colorspace *cs;
if (!strcmp(csi->name, "DeviceGray"))
cs = fz_keep_colorspace(ctx, fz_device_gray(ctx));
else if (!strcmp(csi->name, "DeviceRGB"))
cs = fz_keep_colorspace(ctx, fz_device_rgb(ctx));
else if (!strcmp(csi->name, "DeviceCMYK"))
cs = fz_keep_colorspace(ctx, fz_device_cmyk(ctx));
else
{
pdf_obj *csres, *csobj;
csres = pdf_dict_get(ctx, csi->rdb, PDF_NAME(ColorSpace));
csobj = pdf_dict_gets(ctx, csres, csi->name);
if (!csobj)
fz_throw(ctx, FZ_ERROR_MINOR, "cannot find ColorSpace resource '%s'", csi->name);
cs = pdf_load_colorspace(ctx, csobj);
}
fz_try(ctx)
{
if (stroke)
proc->op_CS(ctx, proc, csi->name, cs);
else
proc->op_cs(ctx, proc, csi->name, cs);
}
fz_always(ctx)
fz_drop_colorspace(ctx, cs);
fz_catch(ctx)
fz_rethrow(ctx);
}
}
static void
pdf_process_SC(fz_context *ctx, pdf_processor *proc, pdf_csi *csi, int stroke)
{
if (csi->name[0])
{
pdf_obj *patres, *patobj, *type;
patres = pdf_dict_get(ctx, csi->rdb, PDF_NAME(Pattern));
patobj = pdf_dict_gets(ctx, patres, csi->name);
if (!patobj)
fz_throw(ctx, FZ_ERROR_MINOR, "cannot find Pattern resource '%s'", csi->name);
type = pdf_dict_get(ctx, patobj, PDF_NAME(PatternType));
if (pdf_to_int(ctx, type) == 1)
{
if (proc->op_SC_pattern && proc->op_sc_pattern)
{
pdf_pattern *pat = pdf_load_pattern(ctx, csi->doc, patobj);
fz_try(ctx)
{
if (stroke)
proc->op_SC_pattern(ctx, proc, csi->name, pat, csi->top, csi->stack);
else
proc->op_sc_pattern(ctx, proc, csi->name, pat, csi->top, csi->stack);
}
fz_always(ctx)
pdf_drop_pattern(ctx, pat);
fz_catch(ctx)
fz_rethrow(ctx);
}
}
else if (pdf_to_int(ctx, type) == 2)
{
if (proc->op_SC_shade && proc->op_sc_shade)
{
fz_shade *shade = pdf_load_shading(ctx, csi->doc, patobj);
fz_try(ctx)
{
if (stroke)
proc->op_SC_shade(ctx, proc, csi->name, shade);
else
proc->op_sc_shade(ctx, proc, csi->name, shade);
}
fz_always(ctx)
fz_drop_shade(ctx, shade);
fz_catch(ctx)
fz_rethrow(ctx);
}
}
else
{
fz_throw(ctx, FZ_ERROR_MINOR, "unknown pattern type: %d", pdf_to_int(ctx, type));
}
}
else
{
if (proc->op_SC_color && proc->op_sc_color)
{
if (stroke)
proc->op_SC_color(ctx, proc, csi->top, csi->stack);
else
proc->op_sc_color(ctx, proc, csi->top, csi->stack);
}
}
}
static pdf_obj *
resolve_properties(fz_context *ctx, pdf_csi *csi, pdf_obj *obj)
{
if (pdf_is_name(ctx, obj))
return pdf_dict_get(ctx, pdf_dict_get(ctx, csi->rdb, PDF_NAME(Properties)), obj);
else
return obj;
}
static void
pdf_process_BDC(fz_context *ctx, pdf_processor *proc, pdf_csi *csi)
{
if (proc->op_BDC)
proc->op_BDC(ctx, proc, csi->name, csi->obj, resolve_properties(ctx, csi, csi->obj));
/* Already hidden, no need to look further */
if (proc->hidden > 0)
{
++proc->hidden;
return;
}
/* We only look at OC groups here */
if (strcmp(csi->name, "OC"))
return;
if (pdf_is_hidden_ocg(ctx, csi->doc->ocg, csi->rdb, proc->usage, csi->obj))
++proc->hidden;
}
static void
pdf_process_BMC(fz_context *ctx, pdf_processor *proc, pdf_csi *csi, const char *name)
{
if (proc->op_BMC)
proc->op_BMC(ctx, proc, name);
if (proc->hidden > 0)
++proc->hidden;
}
static void
pdf_process_EMC(fz_context *ctx, pdf_processor *proc, pdf_csi *csi)
{
if (proc->op_EMC)
proc->op_EMC(ctx, proc);
if (proc->hidden > 0)
--proc->hidden;
}
static void
pdf_process_gsave(fz_context *ctx, pdf_processor *proc, pdf_csi *csi)
{
if (proc->op_q)
proc->op_q(ctx, proc);
++csi->gstate;
}
static void
pdf_process_grestore(fz_context *ctx, pdf_processor *proc, pdf_csi *csi)
{
if (csi->gstate > 0)
{
if (proc->op_Q)
proc->op_Q(ctx, proc);
--csi->gstate;
}
}
static void
pdf_process_end(fz_context *ctx, pdf_processor *proc, pdf_csi *csi)
{
while (csi->gstate > 0)
pdf_process_grestore(ctx, proc, csi);
if (proc->op_END)
proc->op_END(ctx, proc);
}
#define A(a) (a)
#define B(a,b) (a | b << 8)
#define C(a,b,c) (a | b << 8 | c << 16)
static void
pdf_process_keyword(fz_context *ctx, pdf_processor *proc, pdf_csi *csi, fz_stream *stm, char *word)
{
float *s = csi->stack;
char csname[40];
int key;
key = word[0];
if (word[1])
{
key |= word[1] << 8;
if (word[2])
{
key |= word[2] << 16;
if (word[3])
key = 0;
}
}
switch (key)
{
default:
if (!csi->xbalance)
fz_throw(ctx, FZ_ERROR_SYNTAX, "unknown keyword: '%s'", word);
break;
/* general graphics state */
case A('w'): if (proc->op_w) proc->op_w(ctx, proc, s[0]); break;
case A('j'): if (proc->op_j) proc->op_j(ctx, proc, fz_clampi(s[0], 0, 2)); break;
case A('J'): if (proc->op_J) proc->op_J(ctx, proc, fz_clampi(s[0], 0, 2)); break;
case A('M'): if (proc->op_M) proc->op_M(ctx, proc, s[0]); break;
case A('d'): if (proc->op_d) proc->op_d(ctx, proc, csi->obj, s[0]); break;
case B('r','i'): if (proc->op_ri) proc->op_ri(ctx, proc, csi->name); break;
case A('i'): if (proc->op_i) proc->op_i(ctx, proc, s[0]); break;
case B('g','s'):
{
pdf_obj *gsres, *gsobj;
gsres = pdf_dict_get(ctx, csi->rdb, PDF_NAME(ExtGState));
gsobj = pdf_dict_gets(ctx, gsres, csi->name);
if (!gsobj)
fz_throw(ctx, FZ_ERROR_MINOR, "cannot find ExtGState resource '%s'", csi->name);
if (proc->op_gs_begin)
proc->op_gs_begin(ctx, proc, csi->name, gsobj);
pdf_process_extgstate(ctx, proc, csi, gsobj);
if (proc->op_gs_end)
proc->op_gs_end(ctx, proc);
}
break;
/* special graphics state */
case A('q'): pdf_process_gsave(ctx, proc, csi); break;
case A('Q'): pdf_process_grestore(ctx, proc, csi); break;
case B('c','m'): if (proc->op_cm) proc->op_cm(ctx, proc, s[0], s[1], s[2], s[3], s[4], s[5]); break;
/* path construction */
case A('m'): if (proc->op_m) proc->op_m(ctx, proc, s[0], s[1]); break;
case A('l'): if (proc->op_l) proc->op_l(ctx, proc, s[0], s[1]); break;
case A('c'): if (proc->op_c) proc->op_c(ctx, proc, s[0], s[1], s[2], s[3], s[4], s[5]); break;
case A('v'): if (proc->op_v) proc->op_v(ctx, proc, s[0], s[1], s[2], s[3]); break;
case A('y'): if (proc->op_y) proc->op_y(ctx, proc, s[0], s[1], s[2], s[3]); break;
case A('h'): if (proc->op_h) proc->op_h(ctx, proc); break;
case B('r','e'): if (proc->op_re) proc->op_re(ctx, proc, s[0], s[1], s[2], s[3]); break;
/* path painting */
case A('S'): if (proc->op_S) proc->op_S(ctx, proc); break;
case A('s'): if (proc->op_s) proc->op_s(ctx, proc); break;
case A('F'): if (proc->op_F) proc->op_F(ctx, proc); break;
case A('f'): if (proc->op_f) proc->op_f(ctx, proc); break;
case B('f','*'): if (proc->op_fstar) proc->op_fstar(ctx, proc); break;
case A('B'): if (proc->op_B) proc->op_B(ctx, proc); break;
case B('B','*'): if (proc->op_Bstar) proc->op_Bstar(ctx, proc); break;
case A('b'): if (proc->op_b) proc->op_b(ctx, proc); break;
case B('b','*'): if (proc->op_bstar) proc->op_bstar(ctx, proc); break;
case A('n'): if (proc->op_n) proc->op_n(ctx, proc); break;
/* path clipping */
case A('W'): if (proc->op_W) proc->op_W(ctx, proc); break;
case B('W','*'): if (proc->op_Wstar) proc->op_Wstar(ctx, proc); break;
/* text objects */
case B('B','T'): csi->in_text = 1; if (proc->op_BT) proc->op_BT(ctx, proc); break;
case B('E','T'): csi->in_text = 0; if (proc->op_ET) proc->op_ET(ctx, proc); break;
/* text state */
case B('T','c'): if (proc->op_Tc) proc->op_Tc(ctx, proc, s[0]); break;
case B('T','w'): if (proc->op_Tw) proc->op_Tw(ctx, proc, s[0]); break;
case B('T','z'): if (proc->op_Tz) proc->op_Tz(ctx, proc, s[0]); break;
case B('T','L'): if (proc->op_TL) proc->op_TL(ctx, proc, s[0]); break;
case B('T','r'): if (proc->op_Tr) proc->op_Tr(ctx, proc, s[0]); break;
case B('T','s'): if (proc->op_Ts) proc->op_Ts(ctx, proc, s[0]); break;
case B('T','f'):
if (proc->op_Tf)
{
pdf_obj *fontres, *fontobj;
pdf_font_desc *font;
fontres = pdf_dict_get(ctx, csi->rdb, PDF_NAME(Font));
fontobj = pdf_dict_gets(ctx, fontres, csi->name);
if (pdf_is_dict(ctx, fontobj))
font = pdf_try_load_font(ctx, csi->doc, csi->rdb, fontobj, csi->cookie);
else
font = pdf_load_hail_mary_font(ctx, csi->doc);
fz_try(ctx)
proc->op_Tf(ctx, proc, csi->name, font, s[0]);
fz_always(ctx)
pdf_drop_font(ctx, font);
fz_catch(ctx)
fz_rethrow(ctx);
}
break;
/* text positioning */
case B('T','d'): if (proc->op_Td) proc->op_Td(ctx, proc, s[0], s[1]); break;
case B('T','D'): if (proc->op_TD) proc->op_TD(ctx, proc, s[0], s[1]); break;
case B('T','m'): if (proc->op_Tm) proc->op_Tm(ctx, proc, s[0], s[1], s[2], s[3], s[4], s[5]); break;
case B('T','*'): if (proc->op_Tstar) proc->op_Tstar(ctx, proc); break;
/* text showing */
case B('T','J'): if (proc->op_TJ) proc->op_TJ(ctx, proc, csi->obj); break;
case B('T','j'):
if (proc->op_Tj)
{
if (csi->string_len > 0)
proc->op_Tj(ctx, proc, csi->string, csi->string_len);
else
proc->op_Tj(ctx, proc, pdf_to_str_buf(ctx, csi->obj), pdf_to_str_len(ctx, csi->obj));
}
break;
case A('\''):
if (proc->op_squote)
{
if (csi->string_len > 0)
proc->op_squote(ctx, proc, csi->string, csi->string_len);
else
proc->op_squote(ctx, proc, pdf_to_str_buf(ctx, csi->obj), pdf_to_str_len(ctx, csi->obj));
}
break;
case A('"'):
if (proc->op_dquote)
{
if (csi->string_len > 0)
proc->op_dquote(ctx, proc, s[0], s[1], csi->string, csi->string_len);
else
proc->op_dquote(ctx, proc, s[0], s[1], pdf_to_str_buf(ctx, csi->obj), pdf_to_str_len(ctx, csi->obj));
}
break;
/* type 3 fonts */
case B('d','0'): if (proc->op_d0) proc->op_d0(ctx, proc, s[0], s[1]); break;
case B('d','1'): if (proc->op_d1) proc->op_d1(ctx, proc, s[0], s[1], s[2], s[3], s[4], s[5]); break;
/* color */
case B('C','S'): pdf_process_CS(ctx, proc, csi, 1); break;
case B('c','s'): pdf_process_CS(ctx, proc, csi, 0); break;
case B('S','C'): pdf_process_SC(ctx, proc, csi, 1); break;
case B('s','c'): pdf_process_SC(ctx, proc, csi, 0); break;
case C('S','C','N'): pdf_process_SC(ctx, proc, csi, 1); break;
case C('s','c','n'): pdf_process_SC(ctx, proc, csi, 0); break;
case A('G'): if (proc->op_G) proc->op_G(ctx, proc, s[0]); break;
case A('g'): if (proc->op_g) proc->op_g(ctx, proc, s[0]); break;
case B('R','G'): if (proc->op_RG) proc->op_RG(ctx, proc, s[0], s[1], s[2]); break;
case B('r','g'): if (proc->op_rg) proc->op_rg(ctx, proc, s[0], s[1], s[2]); break;
case A('K'): if (proc->op_K) proc->op_K(ctx, proc, s[0], s[1], s[2], s[3]); break;
case A('k'): if (proc->op_k) proc->op_k(ctx, proc, s[0], s[1], s[2], s[3]); break;
/* shadings, images, xobjects */
case B('B','I'):
{
fz_image *img = parse_inline_image(ctx, csi, stm, csname, sizeof csname);
fz_try(ctx)
{
if (proc->op_BI)
proc->op_BI(ctx, proc, img, csname[0] ? csname : NULL);
}
fz_always(ctx)
fz_drop_image(ctx, img);
fz_catch(ctx)
fz_rethrow(ctx);
}
break;
case B('s','h'):
if (proc->op_sh)
{
pdf_obj *shaderes, *shadeobj;
fz_shade *shade;
shaderes = pdf_dict_get(ctx, csi->rdb, PDF_NAME(Shading));
shadeobj = pdf_dict_gets(ctx, shaderes, csi->name);
if (!shadeobj)
fz_throw(ctx, FZ_ERROR_MINOR, "cannot find Shading resource '%s'", csi->name);
shade = pdf_load_shading(ctx, csi->doc, shadeobj);
fz_try(ctx)
proc->op_sh(ctx, proc, csi->name, shade);
fz_always(ctx)
fz_drop_shade(ctx, shade);
fz_catch(ctx)
fz_rethrow(ctx);
}
break;
case B('D','o'): pdf_process_Do(ctx, proc, csi); break;
/* marked content */
case B('M','P'): if (proc->op_MP) proc->op_MP(ctx, proc, csi->name); break;
case B('D','P'): if (proc->op_DP) proc->op_DP(ctx, proc, csi->name, csi->obj, resolve_properties(ctx, csi, csi->obj)); break;
case C('B','M','C'): pdf_process_BMC(ctx, proc, csi, csi->name); break;
case C('B','D','C'): pdf_process_BDC(ctx, proc, csi); break;
case C('E','M','C'): pdf_process_EMC(ctx, proc, csi); break;
/* compatibility */
case B('B','X'): ++csi->xbalance; if (proc->op_BX) proc->op_BX(ctx, proc); break;
case B('E','X'): --csi->xbalance; if (proc->op_EX) proc->op_EX(ctx, proc); break;
}
}
static void
pdf_process_stream(fz_context *ctx, pdf_processor *proc, pdf_csi *csi, fz_stream *stm)
{
pdf_document *doc = csi->doc;
pdf_lexbuf *buf = csi->buf;
fz_cookie *cookie = csi->cookie;
pdf_token tok = PDF_TOK_ERROR;
int in_text_array = 0;
int syntax_errors = 0;
/* make sure we have a clean slate if we come here from flush_text */
pdf_clear_stack(ctx, csi);
fz_var(in_text_array);
fz_var(tok);
if (cookie)
{
cookie->progress_max = -1;
cookie->progress = 0;
}
do
{
fz_try(ctx)
{
do
{
/* Check the cookie */
if (cookie)
{
if (cookie->abort)
{
tok = PDF_TOK_EOF;
break;
}
cookie->progress++;
}
tok = pdf_lex(ctx, stm, buf);
if (in_text_array)
{
switch(tok)
{
case PDF_TOK_CLOSE_ARRAY:
in_text_array = 0;
break;
case PDF_TOK_REAL:
pdf_array_push_real(ctx, csi->obj, buf->f);
break;
case PDF_TOK_INT:
pdf_array_push_int(ctx, csi->obj, buf->i);
break;
case PDF_TOK_STRING:
pdf_array_push_string(ctx, csi->obj, buf->scratch, buf->len);
break;
case PDF_TOK_EOF:
break;
case PDF_TOK_KEYWORD:
if (buf->scratch[0] == 'T' && (buf->scratch[1] == 'w' || buf->scratch[1] == 'c') && buf->scratch[2] == 0)
{
int n = pdf_array_len(ctx, csi->obj);
if (n > 0)
{
pdf_obj *o = pdf_array_get(ctx, csi->obj, n-1);
if (pdf_is_number(ctx, o))
{
csi->stack[0] = pdf_to_real(ctx, o);
pdf_array_delete(ctx, csi->obj, n-1);
pdf_process_keyword(ctx, proc, csi, stm, buf->scratch);
}
}
}
/* Deliberate Fallthrough! */
default:
fz_throw(ctx, FZ_ERROR_SYNTAX, "syntax error in array");
}
}
else switch (tok)
{
case PDF_TOK_ENDSTREAM:
case PDF_TOK_EOF:
tok = PDF_TOK_EOF;
break;
case PDF_TOK_OPEN_ARRAY:
if (csi->obj)
{
pdf_drop_obj(ctx, csi->obj);
csi->obj = NULL;
}
if (csi->in_text)
{
in_text_array = 1;
csi->obj = pdf_new_array(ctx, doc, 4);
}
else
{
csi->obj = pdf_parse_array(ctx, doc, stm, buf);
}
break;
case PDF_TOK_OPEN_DICT:
if (csi->obj)
{
pdf_drop_obj(ctx, csi->obj);
csi->obj = NULL;
}
csi->obj = pdf_parse_dict(ctx, doc, stm, buf);
break;
case PDF_TOK_NAME:
if (csi->name[0])
{
pdf_drop_obj(ctx, csi->obj);
csi->obj = NULL;
csi->obj = pdf_new_name(ctx, buf->scratch);
}
else
fz_strlcpy(csi->name, buf->scratch, sizeof(csi->name));
break;
case PDF_TOK_INT:
if (csi->top < (int)nelem(csi->stack)) {
csi->stack[csi->top] = buf->i;
csi->top ++;
}
else
fz_throw(ctx, FZ_ERROR_SYNTAX, "stack overflow");
break;
case PDF_TOK_REAL:
if (csi->top < (int)nelem(csi->stack)) {
csi->stack[csi->top] = buf->f;
csi->top ++;
}
else
fz_throw(ctx, FZ_ERROR_SYNTAX, "stack overflow");
break;
case PDF_TOK_STRING:
if (buf->len <= sizeof(csi->string))
{
memcpy(csi->string, buf->scratch, buf->len);
csi->string_len = buf->len;
}
else
{
if (csi->obj)
{
pdf_drop_obj(ctx, csi->obj);
csi->obj = NULL;
}
csi->obj = pdf_new_string(ctx, buf->scratch, buf->len);
}
break;
case PDF_TOK_KEYWORD:
pdf_process_keyword(ctx, proc, csi, stm, buf->scratch);
pdf_clear_stack(ctx, csi);
break;
default:
fz_throw(ctx, FZ_ERROR_SYNTAX, "syntax error in content stream");
}
}
while (tok != PDF_TOK_EOF);
}
fz_always(ctx)
{
pdf_clear_stack(ctx, csi);
}
fz_catch(ctx)
{
int caught = fz_caught(ctx);
if (cookie)
{
if (caught == FZ_ERROR_TRYLATER)
{
cookie->incomplete++;
tok = PDF_TOK_EOF;
}
else if (caught == FZ_ERROR_ABORT)
{
fz_rethrow(ctx);
}
else if (caught == FZ_ERROR_MINOR)
{
cookie->errors++;
}
else if (caught == FZ_ERROR_SYNTAX)
{
cookie->errors++;
if (++syntax_errors >= MAX_SYNTAX_ERRORS)
{
fz_warn(ctx, "too many syntax errors; ignoring rest of page");
tok = PDF_TOK_EOF;
}
}
else
{
fz_rethrow(ctx);
}
}
else
{
if (caught == FZ_ERROR_TRYLATER)
tok = PDF_TOK_EOF;
else if (caught == FZ_ERROR_ABORT)
fz_rethrow(ctx);
else if (caught == FZ_ERROR_MINOR)
/* ignore minor errors */ ;
else if (caught == FZ_ERROR_SYNTAX)
{
if (++syntax_errors >= MAX_SYNTAX_ERRORS)
{
fz_warn(ctx, "too many syntax errors; ignoring rest of page");
tok = PDF_TOK_EOF;
}
}
else
{
fz_rethrow(ctx);
}
}
/* If we do catch an error, then reset ourselves to a base lexing state */
in_text_array = 0;
}
}
while (tok != PDF_TOK_EOF);
}
/* Functions to actually process annotations, glyphs and general stream objects */
void
pdf_process_contents(fz_context *ctx, pdf_processor *proc, pdf_document *doc, pdf_obj *rdb, pdf_obj *stmobj, fz_cookie *cookie)
{
pdf_csi csi;
pdf_lexbuf buf;
fz_stream *stm = NULL;
if (!stmobj)
return;
fz_var(stm);
pdf_lexbuf_init(ctx, &buf, PDF_LEXBUF_SMALL);
pdf_init_csi(ctx, &csi, doc, rdb, &buf, cookie);
fz_try(ctx)
{
fz_defer_reap_start(ctx);
stm = pdf_open_contents_stream(ctx, doc, stmobj);
pdf_process_stream(ctx, proc, &csi, stm);
pdf_process_end(ctx, proc, &csi);
}
fz_always(ctx)
{
fz_defer_reap_end(ctx);
fz_drop_stream(ctx, stm);
pdf_clear_stack(ctx, &csi);
pdf_lexbuf_fin(ctx, &buf);
}
fz_catch(ctx)
{
proc->close_processor = NULL; /* aborted run, don't warn about unclosed processor */
fz_rethrow(ctx);
}
}
void
pdf_process_annot(fz_context *ctx, pdf_processor *proc, pdf_document *doc, pdf_page *page, pdf_annot *annot, fz_cookie *cookie)
{
int flags = pdf_dict_get_int(ctx, annot->obj, PDF_NAME(F));
if (flags & (PDF_ANNOT_IS_INVISIBLE | PDF_ANNOT_IS_HIDDEN))
return;
/* popup annotations should never be drawn */
if (pdf_annot_type(ctx, annot) == PDF_ANNOT_POPUP)
return;
if (proc->usage)
{
if (!strcmp(proc->usage, "Print") && !(flags & PDF_ANNOT_IS_PRINT))
return;
if (!strcmp(proc->usage, "View") && (flags & PDF_ANNOT_IS_NO_VIEW))
return;
}
/* TODO: NoZoom and NoRotate */
/* XXX what resources, if any, to use for this check? */
if (pdf_is_hidden_ocg(ctx, doc->ocg, NULL, proc->usage, pdf_dict_get(ctx, annot->obj, PDF_NAME(OC))))
return;
if (proc->op_q && proc->op_cm && proc->op_Do_form && proc->op_Q && annot->ap)
{
fz_matrix matrix = pdf_annot_transform(ctx, annot);
proc->op_q(ctx, proc);
proc->op_cm(ctx, proc,
matrix.a, matrix.b,
matrix.c, matrix.d,
matrix.e, matrix.f);
proc->op_Do_form(ctx, proc, NULL, annot->ap, pdf_page_resources(ctx, page));
proc->op_Q(ctx, proc);
}
}
void
pdf_process_glyph(fz_context *ctx, pdf_processor *proc, pdf_document *doc, pdf_obj *rdb, fz_buffer *contents)
{
pdf_csi csi;
pdf_lexbuf buf;
fz_stream *stm = NULL;
fz_var(stm);
if (!contents)
return;
pdf_lexbuf_init(ctx, &buf, PDF_LEXBUF_SMALL);
pdf_init_csi(ctx, &csi, doc, rdb, &buf, NULL);
fz_try(ctx)
{
stm = fz_open_buffer(ctx, contents);
pdf_process_stream(ctx, proc, &csi, stm);
pdf_process_end(ctx, proc, &csi);
}
fz_always(ctx)
{
fz_drop_stream(ctx, stm);
pdf_clear_stack(ctx, &csi);
pdf_lexbuf_fin(ctx, &buf);
}
fz_catch(ctx)
{
/* Note: Any SYNTAX errors should have been swallowed
* by pdf_process_stream, but in case any escape from other
* functions, recast the error type here to be safe. */
if (fz_caught(ctx) == FZ_ERROR_SYNTAX)
fz_throw(ctx, FZ_ERROR_GENERIC, "syntax error in content stream");
fz_rethrow(ctx);
}
}
void
pdf_tos_save(fz_context *ctx, pdf_text_object_state *tos, fz_matrix save[2])
{
save[0] = tos->tm;
save[1] = tos->tlm;
}
void
pdf_tos_restore(fz_context *ctx, pdf_text_object_state *tos, fz_matrix save[2])
{
tos->tm = save[0];
tos->tlm = save[1];
}
fz_text *
pdf_tos_get_text(fz_context *ctx, pdf_text_object_state *tos)
{
fz_text *text = tos->text;
tos->text = NULL;
return text;
}
void
pdf_tos_reset(fz_context *ctx, pdf_text_object_state *tos, int render)
{
tos->text = fz_new_text(ctx);
tos->text_mode = render;
tos->text_bbox = fz_empty_rect;
}
int
pdf_tos_make_trm(fz_context *ctx, pdf_text_object_state *tos, pdf_text_state *text, pdf_font_desc *fontdesc, int cid, fz_matrix *trm)
{
fz_matrix tsm;
tsm.a = text->size * text->scale;
tsm.b = 0;
tsm.c = 0;
tsm.d = text->size;
tsm.e = 0;
tsm.f = text->rise;
if (fontdesc->wmode == 0)
{
pdf_hmtx h = pdf_lookup_hmtx(ctx, fontdesc, cid);
float w0 = h.w * 0.001f;
tos->char_tx = (w0 * text->size + text->char_space) * text->scale;
tos->char_ty = 0;
}
if (fontdesc->wmode == 1)
{
pdf_vmtx v = pdf_lookup_vmtx(ctx, fontdesc, cid);
float w1 = v.w * 0.001f;
tsm.e -= v.x * fabsf(text->size) * 0.001f;
tsm.f -= v.y * text->size * 0.001f;
tos->char_tx = 0;
tos->char_ty = w1 * text->size + text->char_space;
}
*trm = fz_concat(tsm, tos->tm);
tos->cid = cid;
tos->gid = pdf_font_cid_to_gid(ctx, fontdesc, cid);
tos->fontdesc = fontdesc;
/* Compensate for the glyph cache limited positioning precision */
tos->char_bbox = fz_expand_rect(fz_bound_glyph(ctx, fontdesc->font, tos->gid, *trm), 1);
return tos->gid;
}
void
pdf_tos_move_after_char(fz_context *ctx, pdf_text_object_state *tos)
{
tos->text_bbox = fz_union_rect(tos->text_bbox, tos->char_bbox);
tos->tm = fz_pre_translate(tos->tm, tos->char_tx, tos->char_ty);
}
void
pdf_tos_translate(pdf_text_object_state *tos, float tx, float ty)
{
tos->tlm = fz_pre_translate(tos->tlm, tx, ty);
tos->tm = tos->tlm;
}
void
pdf_tos_set_matrix(pdf_text_object_state *tos, float a, float b, float c, float d, float e, float f)
{
tos->tm.a = a;
tos->tm.b = b;
tos->tm.c = c;
tos->tm.d = d;
tos->tm.e = e;
tos->tm.f = f;
tos->tlm = tos->tm;
}
void
pdf_tos_newline(pdf_text_object_state *tos, float leading)
{
tos->tlm = fz_pre_translate(tos->tlm, 0, -leading);
tos->tm = tos->tlm;
}
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