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|
/* Copyright (C) 2019-2021 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 the license contained in the file LICENSE in this distribution.
Refer to licensing information at http://www.artifex.com or contact
Artifex Software, Inc., 1305 Grant Avenue - Suite 200, Novato,
CA 94945, U.S.A., +1(415)492-9861, for further information.
*/
/* code for TrueType font handling */
#include "pdf_int.h"
#include "pdf_font.h"
#include "pdf_fontTT.h"
#include "pdf_font1C.h" /* OTTO support */
#include "pdf_font_types.h"
#include "pdf_stack.h"
#include "pdf_file.h"
#include "pdf_dict.h"
#include "pdf_array.h"
#include "pdf_deref.h"
#include "gxfont42.h"
#include "gscencs.h"
#include "gsagl.h"
#include "gsutil.h" /* For gs_next_ids() */
enum {
CMAP_TABLE_NONE = 0,
CMAP_TABLE_10_PRESENT = 1,
CMAP_TABLE_30_PRESENT = 2,
CMAP_TABLE_31_PRESENT = 4,
CMAP_TABLE_310_PRESENT = 8
};
static int
pdfi_ttf_string_proc(gs_font_type42 * pfont, ulong offset, uint length, const byte ** pdata)
{
pdf_font_truetype *ttfont = (pdf_font_truetype *)pfont->client_data;
int code = 0;
if ((uint64_t)offset + length > ttfont->sfnt.size) {
*pdata = NULL;
code = gs_note_error(gs_error_invalidfont);
}
else {
*pdata = ttfont->sfnt.data + offset;
}
return code;
}
static gs_glyph pdfi_ttf_encode_char(gs_font *pfont, gs_char chr, gs_glyph_space_t sp)
{
pdf_font_truetype *ttfont = (pdf_font_truetype *)pfont->client_data;
gs_glyph g = GS_NO_GLYPH;
uint ID;
int code;
if ((ttfont->descflags & 4) != 0) {
int code = pdfi_fapi_check_cmap_for_GID(pfont, (uint)chr, &ID);
if (code < 0 || ID == 0)
code = pdfi_fapi_check_cmap_for_GID(pfont, (uint)(chr | 0xf0 << 8), &ID);
g = (gs_glyph)ID;
}
else {
pdf_context *ctx = (pdf_context *)ttfont->ctx;
if (ttfont->Encoding != NULL) { /* safety */
pdf_name *GlyphName = NULL;
code = pdfi_array_get(ctx, ttfont->Encoding, (uint64_t)chr, (pdf_obj **)&GlyphName);
if (code >= 0) {
code = (*ctx->get_glyph_index)(pfont, (byte *)GlyphName->data, GlyphName->length, &ID);
pdfi_countdown(GlyphName);
if (code >= 0)
g = (gs_glyph)ID;
}
}
}
return g;
}
extern single_glyph_list_t SingleGlyphList[];
static uint pdfi_type42_get_glyph_index(gs_font_type42 *pfont, gs_glyph glyph)
{
pdf_font_truetype *ttfont = (pdf_font_truetype *)pfont->client_data;
uint gind = 0;
uint cc = 0;
int i, code = 0;
if (glyph >= GS_MIN_GLYPH_INDEX)
glyph -= GS_MIN_GLYPH_INDEX;
if ((ttfont->descflags & 4) != 0) {
gind = (uint)glyph;
}
else {
pdf_context *ctx = (pdf_context *)ttfont->ctx;
gs_const_string gname;
code = (*ctx->get_glyph_name)((gs_font *)pfont, glyph, &gname);
if (code < 0 || gname.data == NULL) {
return (uint)glyph;
}
if (gname.size == 7 && gname.data[0] == '.' && strncmp((char *)gname.data, ".notdef", 7) == 0) {
return 0; /* .notdef is GID 0, so short cut the rest of the function */
}
if (ttfont->cmap == pdfi_truetype_cmap_10) {
gs_string postname = {0};
gs_glyph g;
g = gs_c_name_glyph((const byte *)gname.data, gname.size);
if (g != GS_NO_GLYPH) {
g = (gs_glyph)gs_c_decode(g, ENCODING_INDEX_MACROMAN);
}
else {
g = GS_NO_CHAR;
}
if (g != GS_NO_CHAR) {
code = pdfi_fapi_check_cmap_for_GID((gs_font *)pfont, (uint)g, &cc);
}
if (code < 0 || cc == 0) {
/* This is a very slow implementation, we may benefit from creating a
* a reverse post table upfront */
for (i = 0; i < pfont->data.numGlyphs; i++) {
code = gs_type42_find_post_name(pfont, (gs_glyph)i, &postname);
if (code >= 0) {
if (gname.data[0] == postname.data[0]
&& gname.size == postname.size
&& !strncmp((char *)gname.data, (char *)postname.data, postname.size))
{
cc = i;
break;
}
}
}
}
}
else {
/* In theory, this should be 3,1 cmap, but we have examples that use 0,1 or other
Unicode "platform" cmap tables, so "hail mary" just try it
*/
single_glyph_list_t *sgl = (single_glyph_list_t *)&(SingleGlyphList);
/* Not to spec, but... if we get a "uni..." formatted name, use
the hex value from that.
*/
if (gname.size > 5 && !strncmp((char *)gname.data, "uni", 3)) {
char gnbuf[64];
int l = (gname.size - 3) > 63 ? 63 : gname.size - 3;
memcpy(gnbuf, gname.data + 3, l);
gnbuf[l] = '\0';
l = sscanf(gnbuf, "%x", &gind);
if (l > 0)
(void)pdfi_fapi_check_cmap_for_GID((gs_font *)pfont, (uint)gind, &cc);
else
cc = 0;
}
else {
/* Slow linear search */
for (i = 0; sgl->Glyph != 0x00; i++) {
if (sgl->Glyph[0] == gname.data[0]
&& strlen(sgl->Glyph) == gname.size
&& !strncmp((char *)sgl->Glyph, (char *)gname.data, gname.size))
break;
sgl++;
}
if (sgl->Glyph != NULL) {
code = pdfi_fapi_check_cmap_for_GID((gs_font *)pfont, (uint)sgl->Unicode, &cc);
if (code < 0 || cc == 0)
cc = 0;
}
else
cc = 0;
if (cc == 0) {
gs_string postname = {0};
/* This is a very slow implementation, we may benefit from creating a
* a reverse post table upfront */
for (i = 0; i < pfont->data.numGlyphs; i++) {
code = gs_type42_find_post_name(pfont, (gs_glyph)i, &postname);
if (code >= 0) {
if (postname.data[0] == gname.data[0]
&& postname.size == gname.size
&& !strncmp((char *)postname.data, (char *)gname.data, gname.size))
{
cc = i;
break;
}
}
}
}
}
}
gind = cc;
}
return gind;
}
static int
pdfi_ttf_enumerate_glyph(gs_font *font, int *pindex, gs_glyph_space_t glyph_space, gs_glyph *pglyph)
{
if (glyph_space == GLYPH_SPACE_INDEX) {
return gs_type42_enumerate_glyph(font, pindex, glyph_space, pglyph);
}
else if (glyph_space == GLYPH_SPACE_NAME) {
pdf_font_truetype *ttfont = (pdf_font_truetype *)font->client_data;
if ((ttfont->descflags & 4) == 0) {
if (*pindex <= 0) {
*pindex = 0;
}
*pglyph = (*font->procs.encode_char)(font, (gs_char)*pindex, glyph_space);
if (*pglyph == GS_NO_GLYPH)
*pindex = 0;
else
(*pindex)++;
}
}
else
*pindex = 0;
return 0;
}
static int pdfi_ttf_glyph_name(gs_font *pfont, gs_glyph glyph, gs_const_string * pstr)
{
pdf_font_truetype *ttfont = (pdf_font_truetype *)pfont->client_data;
pdf_context *ctx = (pdf_context *)ttfont->ctx;
uint ID = 0;
int code = -1;
if (glyph >= GS_MIN_GLYPH_INDEX)
glyph -= GS_MIN_GLYPH_INDEX;
if ((ttfont->descflags & 4) != 0) {
code = gs_type42_find_post_name((gs_font_type42 *)pfont, glyph, (gs_string *)pstr);
if (code < 0) {
char buf[64];
int l;
l = gs_sprintf(buf, "~gs~gName~%04x", (uint)glyph);
code = (*ctx->get_glyph_index)(pfont, (byte *)buf, l, &ID);
}
else {
code = (*ctx->get_glyph_index)(pfont, (byte *)pstr->data, pstr->size, &ID);
}
if (code < 0)
return -1; /* No name, trigger pdfwrite Type 3 fallback */
code = (*ctx->get_glyph_name)(pfont, (gs_glyph)ID, pstr);
if (code < 0)
return -1; /* No name, trigger pdfwrite Type 3 fallback */
}
else {
code = (*ctx->get_glyph_name)(pfont, glyph, pstr);
if (code < 0)
return -1; /* No name, trigger pdfwrite Type 3 fallback */
}
return code;
}
static int
pdfi_alloc_tt_font(pdf_context *ctx, pdf_font_truetype **font, bool is_cid)
{
pdf_font_truetype *ttfont = NULL;
gs_font_type42 *pfont = NULL;
ttfont = (pdf_font_truetype *)gs_alloc_bytes(ctx->memory, sizeof(pdf_font_truetype), "pdfi (truetype pdf_font)");
if (ttfont == NULL)
return_error(gs_error_VMerror);
memset(ttfont, 0x00, sizeof(pdf_font_truetype));
ttfont->type = PDF_FONT;
ttfont->ctx = ctx;
ttfont->pdfi_font_type = e_pdf_font_truetype;
#if REFCNT_DEBUG
ttfont->UID = ctx->UID++;
dmprintf2(ctx->memory, "Allocated object of type %c with UID %"PRIi64"\n", ttfont->type, ttfont->UID);
#endif
pdfi_countup(ttfont);
pfont = (gs_font_type42 *)gs_alloc_struct(ctx->memory, gs_font_type42, &st_gs_font_type42,
"pdfi (truetype pfont)");
if (pfont == NULL) {
pdfi_countdown(ttfont);
return_error(gs_error_VMerror);
}
memset(pfont, 0x00, sizeof(gs_font_type42));
ttfont->pfont = (gs_font_base *)pfont;
gs_make_identity(&pfont->orig_FontMatrix);
gs_make_identity(&pfont->FontMatrix);
pfont->next = pfont->prev = 0;
pfont->memory = ctx->memory;
pfont->dir = ctx->font_dir;
pfont->is_resource = false;
gs_notify_init(&pfont->notify_list, ctx->memory);
pfont->base = (gs_font *) ttfont->pfont;
pfont->client_data = ttfont;
pfont->WMode = 0;
pfont->PaintType = 0;
pfont->StrokeWidth = 0;
pfont->is_cached = 0;
pfont->FAPI = NULL;
pfont->FAPI_font_data = NULL;
pfont->procs.init_fstack = gs_default_init_fstack;
pfont->procs.next_char_glyph = gs_default_next_char_glyph;
pfont->FontType = ft_TrueType;
pfont->ExactSize = fbit_use_outlines;
pfont->InBetweenSize = fbit_use_outlines;
pfont->TransformedChar = fbit_use_outlines;
/* We may want to do something clever with an XUID here */
pfont->id = gs_next_ids(ctx->memory, 1);
uid_set_UniqueID(&pfont->UID, pfont->id);
/* The buildchar proc will be filled in by FAPI -
we won't worry about working without FAPI */
pfont->procs.encode_char = pdfi_ttf_encode_char;
pfont->data.string_proc = pdfi_ttf_string_proc;
pfont->procs.glyph_name = pdfi_ttf_glyph_name;
pfont->procs.decode_glyph = pdfi_decode_glyph;
pfont->procs.define_font = gs_no_define_font;
pfont->procs.make_font = gs_no_make_font;
pfont->procs.font_info = gs_default_font_info;
pfont->procs.glyph_info = gs_default_glyph_info;
pfont->procs.glyph_outline = gs_no_glyph_outline;
pfont->procs.build_char = NULL;
pfont->procs.same_font = gs_default_same_font;
pfont->procs.enumerate_glyph = gs_no_enumerate_glyph;
pfont->encoding_index = -1; /****** WRONG ******/
pfont->nearest_encoding_index = -1; /****** WRONG ******/
pfont->client_data = (void *)ttfont;
*font = ttfont;
return 0;
}
static int pdfi_set_type42_data_procs(gs_font_type42 *pfont)
{
pfont->data.get_glyph_index = pdfi_type42_get_glyph_index;
pfont->procs.enumerate_glyph = pdfi_ttf_enumerate_glyph;
return 0;
}
int pdfi_read_truetype_font(pdf_context *ctx, pdf_dict *font_dict, pdf_dict *stream_dict, pdf_dict *page_dict, byte *buf, int64_t buflen, pdf_font **ppdffont)
{
pdf_font_truetype *font = NULL;
int code = 0, num_chars = 0, i;
pdf_obj *fontdesc = NULL;
pdf_obj *obj = NULL;
pdf_obj *basefont = NULL;
double f;
int64_t descflags;
bool encoding_known = false;
bool forced_symbolic = false;
if (ppdffont == NULL)
return_error(gs_error_invalidaccess);
*ppdffont = NULL;
code = pdfi_dict_knownget_type(ctx, font_dict, "FontDescriptor", PDF_DICT, &fontdesc);
if (code <= 0) {
code = gs_note_error(gs_error_invalidfont);
goto error;
}
if ((code = pdfi_alloc_tt_font(ctx, &font, false)) < 0) {
code = gs_note_error(gs_error_invalidfont);
goto error;
}
font->FontDescriptor = (pdf_dict *)fontdesc;
fontdesc = NULL;
code = pdfi_dict_get_number(ctx, font_dict, "FirstChar", &f);
if (code < 0) {
goto error;
}
font->FirstChar = (int)f;
code = pdfi_dict_get_number(ctx, font_dict, "LastChar", &f);
if (code < 0) {
goto error;
}
font->LastChar = (int)f;
num_chars = font->LastChar - font->FirstChar + 1;
font->sfnt.data = buf;
font->sfnt.size = buflen;
buf = NULL;
/* Strictly speaking BaseFont is required, but we can continue without one */
code = pdfi_dict_knownget_type(ctx, font_dict, "BaseFont", PDF_NAME, (pdf_obj **)&basefont);
if (code > 0) {
pdf_name *nobj = (pdf_name *)basefont;
int nlen = nobj->length > gs_font_name_max ? gs_font_name_max : nobj->length;
memcpy(font->pfont->key_name.chars, nobj->data, nlen);
font->pfont->key_name.chars[nlen] = 0;
font->pfont->key_name.size = nlen;
memcpy(font->pfont->font_name.chars, nobj->data, nlen);
font->pfont->font_name.chars[nlen] = 0;
font->pfont->font_name.size = nlen;
pdfi_countdown(obj);
obj = NULL;
}
font->BaseFont = basefont;
basefont = NULL;
font->PDF_font = font_dict;
pdfi_countup(font_dict);
code = pdfi_dict_knownget_type(ctx, font_dict, "Widths", PDF_ARRAY, (pdf_obj **)&obj);
if (code < 0)
goto error;
if (code > 0) {
if (num_chars != pdfi_array_size((pdf_array *)obj)) {
code = gs_note_error(gs_error_rangecheck);
goto error;
}
font->Widths = (double *)gs_alloc_bytes(ctx->memory, sizeof(double) * num_chars, "truetype font Widths array");
if (font->Widths == NULL) {
code = gs_note_error(gs_error_VMerror);
goto error;
}
memset(font->Widths, 0x00, sizeof(double) * num_chars);
for (i = 0; i < num_chars; i++) {
code = pdfi_array_get_number(ctx, (pdf_array *)obj, (uint64_t)i, &font->Widths[i]);
if (code < 0)
goto error;
font->Widths[i] /= 1000;
}
}
pdfi_countdown(obj);
obj = NULL;
code = pdfi_dict_get_int(ctx, font->FontDescriptor, "Flags", &descflags);
if (code < 0)
descflags = 0;
code = pdfi_dict_get(ctx, font_dict, "Encoding", &obj);
if (code < 0) {
static const char encstr[] = "WinAnsiEncoding";
code = pdfi_name_alloc(ctx, (byte *)encstr, strlen(encstr), (pdf_obj **)&obj);
if (code >= 0)
pdfi_countup(obj);
else
goto error;
}
else {
encoding_known = true;
/* If we have and encoding, and both the symbolic and non-symbolic flag are set,
believe that latter.
*/
if ((descflags & 32) != 0)
descflags = (descflags & ~4);
}
if ((forced_symbolic = pdfi_font_known_symbolic(font->BaseFont)) == true) {
descflags |= 4;
}
code = pdfi_create_Encoding(ctx, obj, NULL, (pdf_obj **)&font->Encoding);
/* If we get an error, and the font is non-symbolic, return the error */
if (code < 0 && (descflags & 4) == 0)
goto error;
/* If we get an error, and the font is symbolic, pretend we never saw an /Encoding */
if (code < 0)
encoding_known = false;
pdfi_countdown(obj);
obj = NULL;
font->fake_glyph_names = (gs_string *)gs_alloc_bytes(OBJ_MEMORY(font), font->LastChar * sizeof(gs_string), "pdfi_read_truetype_font: fake_glyph_names");
if (!font->fake_glyph_names) {
code = gs_note_error(gs_error_VMerror);
goto error;
}
memset(font->fake_glyph_names, 0x00, font->LastChar * sizeof(gs_string));
code = gs_type42_font_init((gs_font_type42 *)font->pfont, 0);
if (code < 0) {
goto error;
}
code = pdfi_set_type42_data_procs((gs_font_type42 *)font->pfont);
if (code < 0) {
goto error;
}
/* We're probably dead in the water without cmap tables, but make sure, for safety */
/* This is a horrendous morass of guesses at what Acrobat does with files that contravene
what the spec says about symbolic fonts, cmap tables and encodings.
*/
if (forced_symbolic != true && (descflags & 4) != 0 && ((gs_font_type42 *)font->pfont)->data.cmap != 0) {
gs_font_type42 *t42f = (gs_font_type42 *)font->pfont;
int numcmaps;
int cmaps_available = CMAP_TABLE_NONE;
const byte *d;
code = (*t42f->data.string_proc)(t42f, t42f->data.cmap + 2, 2, &d);
if (code < 0)
goto error;
numcmaps = d[1] | d[0] << 8;
for (i = 0; i < numcmaps; i++) {
code = (*t42f->data.string_proc)(t42f, t42f->data.cmap + 4 + i * 8, 4, &d);
if (code < 0)
goto error;
#define CMAP_PLAT_ENC_ID(a,b,c,d) (a << 24 | b << 16 | c << 8 | d)
switch(CMAP_PLAT_ENC_ID(d[0], d[1], d[2], d[3])) {
case CMAP_PLAT_ENC_ID(0, 1, 0, 0):
cmaps_available |= CMAP_TABLE_10_PRESENT;
break;
case CMAP_PLAT_ENC_ID(0, 3, 0, 0):
cmaps_available |= CMAP_TABLE_30_PRESENT;
break;
case CMAP_PLAT_ENC_ID(0, 3, 0, 1):
cmaps_available |= CMAP_TABLE_31_PRESENT;
break;
case CMAP_PLAT_ENC_ID(0, 3, 1, 0):
cmaps_available |= CMAP_TABLE_310_PRESENT;
break;
default: /* Not one we're interested in */
break;
}
}
#undef CMAP_PLAT_ENC_ID
if ((cmaps_available & CMAP_TABLE_30_PRESENT) == CMAP_TABLE_30_PRESENT) {
font->descflags = descflags;
}
else if (encoding_known == true) {
static const char encstr[] = "WinAnsiEncoding";
font->descflags = descflags & ~4;
code = pdfi_name_alloc(ctx, (byte *)encstr, strlen(encstr), (pdf_obj **)&obj);
if (code >= 0)
pdfi_countup(obj);
else
goto error;
pdfi_countdown(font->Encoding);
code = pdfi_create_Encoding(ctx, obj, NULL, (pdf_obj **)&font->Encoding);
if (code < 0)
goto error;
pdfi_countdown(obj);
obj = NULL;
}
else
font->descflags = descflags;
}
else {
font->descflags = descflags;
}
code = gs_definefont(ctx->font_dir, (gs_font *)font->pfont);
if (code < 0) {
goto error;
}
code = pdfi_fapi_passfont((pdf_font *)font, 0, NULL, NULL, font->sfnt.data, font->sfnt.size);
if (code < 0) {
goto error;
}
/* object_num can be zero if the dictionary was defined inline */
if (font->object_num != 0) {
code = replace_cache_entry(ctx, (pdf_obj *)font);
if (code < 0)
goto error;
}
*ppdffont = (pdf_font *)font;
return code;
error:
if (buf != NULL)
gs_free_object(ctx->memory, buf, "pdfi_read_truetype_font(buf)");
pdfi_countdown(fontdesc);
pdfi_countdown(basefont);
pdfi_countdown(obj);
pdfi_countdown(font);
return code;
}
int pdfi_free_font_truetype(pdf_obj *font)
{
pdf_font_truetype *ttfont = (pdf_font_truetype *)font;
int i;
if (ttfont->pfont)
gs_free_object(OBJ_MEMORY(ttfont), ttfont->pfont, "Free TrueType gs_font");
if (ttfont->Widths)
gs_free_object(OBJ_MEMORY(ttfont), ttfont->Widths, "Free TrueType font Widths array");
if (ttfont->fake_glyph_names != NULL) {
for (i = 0; i < ttfont->LastChar; i++) {
if (ttfont->fake_glyph_names[i].data != NULL)
gs_free_object(OBJ_MEMORY(ttfont), ttfont->fake_glyph_names[i].data, "Free TrueType fake_glyph_name");
}
}
gs_free_object(OBJ_MEMORY(ttfont), ttfont->fake_glyph_names, "Free TrueType fake_glyph_names");
gs_free_object(OBJ_MEMORY(ttfont), ttfont->sfnt.data, "Free TrueType font sfnt buffer");
pdfi_countdown(ttfont->FontDescriptor);
pdfi_countdown(ttfont->Encoding);
pdfi_countdown(ttfont->BaseFont);
gs_free_object(OBJ_MEMORY(ttfont), ttfont, "Free TrueType font");
return 0;
}
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