summaryrefslogtreecommitdiff
path: root/pdf/pdf_stream.c
diff options
context:
space:
mode:
Diffstat (limited to 'pdf/pdf_stream.c')
-rw-r--r--pdf/pdf_stream.c130
1 files changed, 117 insertions, 13 deletions
diff --git a/pdf/pdf_stream.c b/pdf/pdf_stream.c
index c66e703e..28fc616f 100644
--- a/pdf/pdf_stream.c
+++ b/pdf/pdf_stream.c
@@ -49,7 +49,7 @@ pdf_stream_has_crypt(fz_context *ctx, fz_obj *stm)
* Create a filter given a name and param dictionary.
*/
static fz_stream *
-build_filter(fz_stream *chain, pdf_document * xref, fz_obj * f, fz_obj * p, int num, int gen)
+build_filter(fz_stream *chain, pdf_document * xref, fz_obj * f, fz_obj * p, int num, int gen, pdf_image_params *params)
{
fz_context *ctx = chain->ctx;
char *s = fz_to_name(f);
@@ -79,6 +79,19 @@ build_filter(fz_stream *chain, pdf_document * xref, fz_obj * f, fz_obj * p, int
fz_obj *rows = fz_dict_gets(p, "Rows");
fz_obj *eob = fz_dict_gets(p, "EndOfBlock");
fz_obj *bi1 = fz_dict_gets(p, "BlackIs1");
+ if (params)
+ {
+ /* We will shortstop here */
+ params->type = PDF_IMAGE_FAX;
+ params->u.fax.k = (k ? fz_to_int(k) : 0);
+ params->u.fax.eol = (eol ? fz_to_bool(eol) : 0);
+ params->u.fax.eba = (eba ? fz_to_bool(eba) : 0);
+ params->u.fax.columns = (columns ? fz_to_int(columns) : 1728);
+ params->u.fax.rows = (rows ? fz_to_int(rows) : 0);
+ params->u.fax.eob = (eob ? fz_to_bool(eob) : 1);
+ params->u.fax.bi1 = (bi1 ? fz_to_bool(bi1) : 0);
+ return chain;
+ }
return fz_open_faxd(chain,
k ? fz_to_int(k) : 0,
eol ? fz_to_bool(eol) : 0,
@@ -92,14 +105,38 @@ build_filter(fz_stream *chain, pdf_document * xref, fz_obj * f, fz_obj * p, int
else if (!strcmp(s, "DCTDecode") || !strcmp(s, "DCT"))
{
fz_obj *ct = fz_dict_gets(p, "ColorTransform");
+ if (params)
+ {
+ /* We will shortstop here */
+ params->type = PDF_IMAGE_JPEG;
+ params->u.jpeg.ct = (ct ? fz_to_int(ct) : -1);
+ return chain;
+ }
return fz_open_dctd(chain, ct ? fz_to_int(ct) : -1);
}
else if (!strcmp(s, "RunLengthDecode") || !strcmp(s, "RL"))
+ {
+ if (params)
+ {
+ /* We will shortstop here */
+ params->type = PDF_IMAGE_RLD;
+ return chain;
+ }
return fz_open_rld(chain);
-
+ }
else if (!strcmp(s, "FlateDecode") || !strcmp(s, "Fl"))
{
+ if (params)
+ {
+ /* We will shortstop here */
+ params->type = PDF_IMAGE_FLATE;
+ params->u.flate.predictor = predictor;
+ params->u.flate.columns = columns;
+ params->u.flate.colors = colors;
+ params->u.flate.bpc = bpc;
+ return chain;
+ }
chain = fz_open_flated(chain);
if (predictor > 1)
chain = fz_open_predict(chain, predictor, columns, colors, bpc);
@@ -109,6 +146,17 @@ build_filter(fz_stream *chain, pdf_document * xref, fz_obj * f, fz_obj * p, int
else if (!strcmp(s, "LZWDecode") || !strcmp(s, "LZW"))
{
fz_obj *ec = fz_dict_gets(p, "EarlyChange");
+ if (params)
+ {
+ /* We will shortstop here */
+ params->type = PDF_IMAGE_LZW;
+ params->u.lzw.predictor = predictor;
+ params->u.lzw.columns = columns;
+ params->u.lzw.colors = colors;
+ params->u.lzw.bpc = bpc;
+ params->u.lzw.ec = (ec ? fz_to_int(ec) : 1);
+ return chain;
+ }
chain = fz_open_lzwd(chain, ec ? fz_to_int(ec) : 1);
if (predictor > 1)
chain = fz_open_predict(chain, predictor, columns, colors, bpc);
@@ -155,7 +203,7 @@ build_filter(fz_stream *chain, pdf_document * xref, fz_obj * f, fz_obj * p, int
* Assume ownership of head.
*/
static fz_stream *
-build_filter_chain(fz_stream *chain, pdf_document *xref, fz_obj *fs, fz_obj *ps, int num, int gen)
+build_filter_chain(fz_stream *chain, pdf_document *xref, fz_obj *fs, fz_obj *ps, int num, int gen, pdf_image_params *params)
{
fz_obj *f;
fz_obj *p;
@@ -166,7 +214,7 @@ build_filter_chain(fz_stream *chain, pdf_document *xref, fz_obj *fs, fz_obj *ps,
{
f = fz_array_get(fs, i);
p = fz_array_get(ps, i);
- chain = build_filter(chain, xref, f, p, num, gen);
+ chain = build_filter(chain, xref, f, p, num, gen, (i == n-1 ? params : NULL));
}
return chain;
@@ -210,7 +258,7 @@ pdf_open_raw_filter(fz_stream *chain, pdf_document *xref, fz_obj *stmobj, int nu
* to stream length and decrypting.
*/
static fz_stream *
-pdf_open_filter(fz_stream *chain, pdf_document *xref, fz_obj *stmobj, int num, int gen)
+pdf_open_filter(fz_stream *chain, pdf_document *xref, fz_obj *stmobj, int num, int gen, pdf_image_params *imparams)
{
fz_obj *filters;
fz_obj *params;
@@ -221,9 +269,9 @@ pdf_open_filter(fz_stream *chain, pdf_document *xref, fz_obj *stmobj, int num, i
chain = pdf_open_raw_filter(chain, xref, stmobj, num, gen);
if (fz_is_name(filters))
- chain = build_filter(chain, xref, filters, params, num, gen);
+ chain = build_filter(chain, xref, filters, params, num, gen, imparams);
else if (fz_array_len(filters) > 0)
- chain = build_filter_chain(chain, xref, filters, params, num, gen);
+ chain = build_filter_chain(chain, xref, filters, params, num, gen, imparams);
fz_lock_stream(chain);
return chain;
@@ -234,7 +282,7 @@ pdf_open_filter(fz_stream *chain, pdf_document *xref, fz_obj *stmobj, int num, i
* constraining to stream length, and without decryption.
*/
fz_stream *
-pdf_open_inline_stream(pdf_document *xref, fz_obj *stmobj, int length, fz_stream *chain)
+pdf_open_inline_stream(pdf_document *xref, fz_obj *stmobj, int length, fz_stream *chain, pdf_image_params *imparams)
{
fz_obj *filters;
fz_obj *params;
@@ -246,9 +294,9 @@ pdf_open_inline_stream(pdf_document *xref, fz_obj *stmobj, int length, fz_stream
fz_keep_stream(chain);
if (fz_is_name(filters))
- return build_filter(chain, xref, filters, params, 0, 0);
+ return build_filter(chain, xref, filters, params, 0, 0, imparams);
if (fz_array_len(filters) > 0)
- return build_filter_chain(chain, xref, filters, params, 0, 0);
+ return build_filter_chain(chain, xref, filters, params, 0, 0, imparams);
return fz_open_null(chain, length);
}
@@ -290,6 +338,12 @@ pdf_open_raw_stream(pdf_document *xref, int num, int gen)
fz_stream *
pdf_open_stream(pdf_document *xref, int num, int gen)
{
+ return pdf_open_image_stream(xref, num, gen, NULL);
+}
+
+fz_stream *
+pdf_open_image_stream(pdf_document *xref, int num, int gen, pdf_image_params *params)
+{
pdf_xref_entry *x;
fz_stream *stm;
@@ -304,12 +358,56 @@ pdf_open_stream(pdf_document *xref, int num, int gen)
if (x->stm_ofs == 0)
fz_throw(xref->ctx, "object is not a stream");
- stm = pdf_open_filter(xref->file, xref, x->obj, num, gen);
+ stm = pdf_open_filter(xref->file, xref, x->obj, num, gen, params);
fz_seek(xref->file, x->stm_ofs, 0);
return stm;
}
fz_stream *
+pdf_open_image_decomp_stream(fz_context *ctx, fz_buffer *buffer, pdf_image_params *params, int *factor)
+{
+ fz_stream *chain = fz_open_buffer(ctx, buffer);
+
+ switch (params->type)
+ {
+ case PDF_IMAGE_FAX:
+ *factor = 1;
+ return fz_open_faxd(chain,
+ params->u.fax.k,
+ params->u.fax.eol,
+ params->u.fax.eba,
+ params->u.fax.columns,
+ params->u.fax.rows,
+ params->u.fax.eob,
+ params->u.fax.bi1);
+ case PDF_IMAGE_JPEG:
+ if (*factor > 8)
+ *factor = 8;
+ return fz_open_resized_dctd(chain, params->u.jpeg.ct, *factor);
+ case PDF_IMAGE_RLD:
+ *factor = 1;
+ return fz_open_rld(chain);
+ case PDF_IMAGE_FLATE:
+ *factor = 1;
+ chain = fz_open_flated(chain);
+ if (params->u.flate.predictor > 1)
+ chain = fz_open_predict(chain, params->u.flate.predictor, params->u.flate.columns, params->u.flate.colors, params->u.flate.bpc);
+ return chain;
+ case PDF_IMAGE_LZW:
+ *factor = 1;
+ chain = fz_open_lzwd(chain, params->u.lzw.ec);
+ if (params->u.lzw.predictor > 1)
+ chain = fz_open_predict(chain, params->u.lzw.predictor, params->u.lzw.columns, params->u.lzw.colors, params->u.lzw.bpc);
+ return chain;
+ default:
+ *factor = 1;
+ break;
+ }
+
+ return chain;
+}
+
+fz_stream *
pdf_open_stream_with_offset(pdf_document *xref, int num, int gen, fz_obj *dict, int stm_ofs)
{
fz_stream *stm;
@@ -317,7 +415,7 @@ pdf_open_stream_with_offset(pdf_document *xref, int num, int gen, fz_obj *dict,
if (stm_ofs == 0)
fz_throw(xref->ctx, "object is not a stream");
- stm = pdf_open_filter(xref->file, xref, dict, num, gen);
+ stm = pdf_open_filter(xref->file, xref, dict, num, gen, NULL);
fz_seek(xref->file, stm_ofs, 0);
return stm;
}
@@ -372,6 +470,12 @@ pdf_guess_filter_length(int len, char *filter)
fz_buffer *
pdf_load_stream(pdf_document *xref, int num, int gen)
{
+ return pdf_load_image_stream(xref, num, gen, NULL);
+}
+
+fz_buffer *
+pdf_load_image_stream(pdf_document *xref, int num, int gen, pdf_image_params *params)
+{
fz_context *ctx = xref->ctx;
fz_stream *stm = NULL;
fz_obj *dict, *obj;
@@ -392,7 +496,7 @@ pdf_load_stream(pdf_document *xref, int num, int gen)
fz_drop_obj(dict);
- stm = pdf_open_stream(xref, num, gen);
+ stm = pdf_open_image_stream(xref, num, gen, params);
/* RJW: "cannot open stream (%d %d R)", num, gen */
fz_try(ctx)
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-05 12:30:37 +0000