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#include "mupdf/pdf.h"
/*
* CMap parser
*/
static int
pdf_code_from_string(char *buf, int len)
{
int a = 0;
while (len--)
a = (a << 8) | *(unsigned char *)buf++;
return a;
}
static void
pdf_parse_cmap_name(fz_context *ctx, pdf_cmap *cmap, fz_stream *file, pdf_lexbuf *buf)
{
pdf_token tok;
tok = pdf_lex(ctx, file, buf);
if (tok == PDF_TOK_NAME)
fz_strlcpy(cmap->cmap_name, buf->scratch, sizeof(cmap->cmap_name));
else
fz_warn(ctx, "expected name after CMapName in cmap");
}
static void
pdf_parse_wmode(fz_context *ctx, pdf_cmap *cmap, fz_stream *file, pdf_lexbuf *buf)
{
pdf_token tok;
tok = pdf_lex(ctx, file, buf);
if (tok == PDF_TOK_INT)
pdf_set_cmap_wmode(ctx, cmap, buf->i);
else
fz_warn(ctx, "expected integer after WMode in cmap");
}
static void
pdf_parse_codespace_range(fz_context *ctx, pdf_cmap *cmap, fz_stream *file, pdf_lexbuf *buf)
{
pdf_token tok;
int lo, hi;
while (1)
{
tok = pdf_lex(ctx, file, buf);
if (tok == PDF_TOK_KEYWORD && !strcmp(buf->scratch, "endcodespacerange"))
return;
else if (tok == PDF_TOK_STRING)
{
lo = pdf_code_from_string(buf->scratch, buf->len);
tok = pdf_lex(ctx, file, buf);
if (tok == PDF_TOK_STRING)
{
hi = pdf_code_from_string(buf->scratch, buf->len);
pdf_add_codespace(ctx, cmap, lo, hi, buf->len);
}
else break;
}
else break;
}
fz_throw(ctx, FZ_ERROR_GENERIC, "expected string or endcodespacerange");
}
static void
pdf_parse_cid_range(fz_context *ctx, pdf_cmap *cmap, fz_stream *file, pdf_lexbuf *buf)
{
pdf_token tok;
int lo, hi, dst;
while (1)
{
tok = pdf_lex(ctx, file, buf);
if (tok == PDF_TOK_KEYWORD && !strcmp(buf->scratch, "endcidrange"))
return;
else if (tok != PDF_TOK_STRING)
fz_throw(ctx, FZ_ERROR_GENERIC, "expected string or endcidrange");
lo = pdf_code_from_string(buf->scratch, buf->len);
tok = pdf_lex(ctx, file, buf);
if (tok != PDF_TOK_STRING)
fz_throw(ctx, FZ_ERROR_GENERIC, "expected string");
hi = pdf_code_from_string(buf->scratch, buf->len);
tok = pdf_lex(ctx, file, buf);
if (tok != PDF_TOK_INT)
fz_throw(ctx, FZ_ERROR_GENERIC, "expected integer");
dst = buf->i;
pdf_map_range_to_range(ctx, cmap, lo, hi, dst);
}
}
static void
pdf_parse_cid_char(fz_context *ctx, pdf_cmap *cmap, fz_stream *file, pdf_lexbuf *buf)
{
pdf_token tok;
int src, dst;
while (1)
{
tok = pdf_lex(ctx, file, buf);
if (tok == PDF_TOK_KEYWORD && !strcmp(buf->scratch, "endcidchar"))
return;
else if (tok != PDF_TOK_STRING)
fz_throw(ctx, FZ_ERROR_GENERIC, "expected string or endcidchar");
src = pdf_code_from_string(buf->scratch, buf->len);
tok = pdf_lex(ctx, file, buf);
if (tok != PDF_TOK_INT)
fz_throw(ctx, FZ_ERROR_GENERIC, "expected integer");
dst = buf->i;
pdf_map_range_to_range(ctx, cmap, src, src, dst);
}
}
static void
pdf_parse_bf_range_array(fz_context *ctx, pdf_cmap *cmap, fz_stream *file, pdf_lexbuf *buf, int lo, int hi)
{
pdf_token tok;
int dst[256];
int i;
while (1)
{
tok = pdf_lex(ctx, file, buf);
if (tok == PDF_TOK_CLOSE_ARRAY)
return;
/* Note: does not handle [ /Name /Name ... ] */
else if (tok != PDF_TOK_STRING)
fz_throw(ctx, FZ_ERROR_GENERIC, "expected string or ]");
if (buf->len / 2)
{
int len = fz_mini(buf->len / 2, nelem(dst));
for (i = 0; i < len; i++)
dst[i] = pdf_code_from_string(&buf->scratch[i * 2], 2);
pdf_map_one_to_many(ctx, cmap, lo, dst, buf->len / 2);
}
lo ++;
}
}
static void
pdf_parse_bf_range(fz_context *ctx, pdf_cmap *cmap, fz_stream *file, pdf_lexbuf *buf)
{
pdf_token tok;
int lo, hi, dst;
while (1)
{
tok = pdf_lex(ctx, file, buf);
if (tok == PDF_TOK_KEYWORD && !strcmp(buf->scratch, "endbfrange"))
return;
else if (tok != PDF_TOK_STRING)
fz_throw(ctx, FZ_ERROR_GENERIC, "expected string or endbfrange");
lo = pdf_code_from_string(buf->scratch, buf->len);
tok = pdf_lex(ctx, file, buf);
if (tok != PDF_TOK_STRING)
fz_throw(ctx, FZ_ERROR_GENERIC, "expected string");
hi = pdf_code_from_string(buf->scratch, buf->len);
if (lo < 0 || lo > 65535 || hi < 0 || hi > 65535 || lo > hi)
{
fz_warn(ctx, "bf_range limits out of range in cmap %s", cmap->cmap_name);
return;
}
tok = pdf_lex(ctx, file, buf);
if (tok == PDF_TOK_STRING)
{
if (buf->len == 2)
{
dst = pdf_code_from_string(buf->scratch, buf->len);
pdf_map_range_to_range(ctx, cmap, lo, hi, dst);
}
else
{
int dststr[256];
int i;
if (buf->len / 2)
{
int len = fz_mini(buf->len / 2, nelem(dststr));
for (i = 0; i < len; i++)
dststr[i] = pdf_code_from_string(&buf->scratch[i * 2], 2);
while (lo <= hi)
{
dststr[i-1] ++;
pdf_map_one_to_many(ctx, cmap, lo, dststr, i);
lo ++;
}
}
}
}
else if (tok == PDF_TOK_OPEN_ARRAY)
{
pdf_parse_bf_range_array(ctx, cmap, file, buf, lo, hi);
}
else
{
fz_throw(ctx, FZ_ERROR_GENERIC, "expected string or array or endbfrange");
}
}
}
static void
pdf_parse_bf_char(fz_context *ctx, pdf_cmap *cmap, fz_stream *file, pdf_lexbuf *buf)
{
pdf_token tok;
int dst[256];
int src;
int i;
while (1)
{
tok = pdf_lex(ctx, file, buf);
if (tok == PDF_TOK_KEYWORD && !strcmp(buf->scratch, "endbfchar"))
return;
else if (tok != PDF_TOK_STRING)
fz_throw(ctx, FZ_ERROR_GENERIC, "expected string or endbfchar");
src = pdf_code_from_string(buf->scratch, buf->len);
tok = pdf_lex(ctx, file, buf);
/* Note: does not handle /dstName */
if (tok != PDF_TOK_STRING)
fz_throw(ctx, FZ_ERROR_GENERIC, "expected string");
if (buf->len / 2)
{
int len = fz_mini(buf->len / 2, nelem(dst));
for (i = 0; i < len; i++)
dst[i] = pdf_code_from_string(&buf->scratch[i * 2], 2);
pdf_map_one_to_many(ctx, cmap, src, dst, i);
}
}
}
pdf_cmap *
pdf_load_cmap(fz_context *ctx, fz_stream *file)
{
pdf_cmap *cmap;
char key[64];
pdf_lexbuf buf;
pdf_token tok;
pdf_lexbuf_init(ctx, &buf, PDF_LEXBUF_SMALL);
cmap = pdf_new_cmap(ctx);
strcpy(key, ".notdef");
fz_try(ctx)
{
while (1)
{
tok = pdf_lex(ctx, file, &buf);
if (tok == PDF_TOK_EOF)
break;
else if (tok == PDF_TOK_NAME)
{
if (!strcmp(buf.scratch, "CMapName"))
pdf_parse_cmap_name(ctx, cmap, file, &buf);
else if (!strcmp(buf.scratch, "WMode"))
pdf_parse_wmode(ctx, cmap, file, &buf);
else
fz_strlcpy(key, buf.scratch, sizeof key);
}
else if (tok == PDF_TOK_KEYWORD)
{
if (!strcmp(buf.scratch, "endcmap"))
break;
else if (!strcmp(buf.scratch, "usecmap"))
fz_strlcpy(cmap->usecmap_name, key, sizeof(cmap->usecmap_name));
else if (!strcmp(buf.scratch, "begincodespacerange"))
pdf_parse_codespace_range(ctx, cmap, file, &buf);
else if (!strcmp(buf.scratch, "beginbfchar"))
pdf_parse_bf_char(ctx, cmap, file, &buf);
else if (!strcmp(buf.scratch, "begincidchar"))
pdf_parse_cid_char(ctx, cmap, file, &buf);
else if (!strcmp(buf.scratch, "beginbfrange"))
pdf_parse_bf_range(ctx, cmap, file, &buf);
else if (!strcmp(buf.scratch, "begincidrange"))
pdf_parse_cid_range(ctx, cmap, file, &buf);
}
/* ignore everything else */
}
pdf_sort_cmap(ctx, cmap);
}
fz_always(ctx)
{
pdf_lexbuf_fin(ctx, &buf);
}
fz_catch(ctx)
{
pdf_drop_cmap(ctx, cmap);
fz_rethrow_message(ctx, "syntaxerror in cmap");
}
return cmap;
}
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