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