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[master] Imported from libpng-1.4.3.tar

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This commit is contained in:
Glenn Randers-Pehrson
2010-06-25 19:32:34 -05:00
parent 5316f66005
commit a582b8f840
49 changed files with 465 additions and 174 deletions
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158
pngpread.c
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@@ -1,7 +1,7 @@
/* pngpread.c - read a png file in push mode
*
* Last changed in libpng 1.4.1 [February 25, 2010]
* Last changed in libpng 1.4.3 [June 26, 2010]
* Copyright (c) 1998-2010 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -779,8 +779,7 @@ png_push_read_IDAT(png_structp png_ptr)
png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
png_ptr->idat_size -= save_size;
png_ptr->buffer_size -= save_size;
@@ -803,8 +802,8 @@ png_push_read_IDAT(png_structp png_ptr)
save_size = png_ptr->current_buffer_size;
png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size);
png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size);
png_ptr->idat_size -= save_size;
png_ptr->buffer_size -= save_size;
@@ -829,62 +828,101 @@ void /* PRIVATE */
png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
png_size_t buffer_length)
{
int ret;
if ((png_ptr->flags & PNG_FLAG_ZLIB_FINISHED) && buffer_length)
png_benign_error(png_ptr, "Extra compression data");
/* The caller checks for a non-zero buffer length. */
if (!(buffer_length > 0) || buffer == NULL)
png_error(png_ptr, "No IDAT data (internal error)");
/* This routine must process all the data it has been given
* before returning, calling the row callback as required to
* handle the uncompressed results.
*/
png_ptr->zstream.next_in = buffer;
png_ptr->zstream.avail_in = (uInt)buffer_length;
for (;;)
/* Keep going until the decompressed data is all processed
* or the stream marked as finished.
*/
while (png_ptr->zstream.avail_in > 0 &&
!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
{
ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
if (ret != Z_OK)
int ret;
/* We have data for zlib, but we must check that zlib
* has somewhere to put the results. It doesn't matter
* if we don't expect any results -- it may be the input
* data is just the LZ end code.
*/
if (!(png_ptr->zstream.avail_out > 0))
{
if (ret == Z_STREAM_END)
{
if (png_ptr->zstream.avail_in)
png_benign_error(png_ptr, "Extra compressed data");
if (!(png_ptr->zstream.avail_out))
{
png_push_process_row(png_ptr);
}
png_ptr->mode |= PNG_AFTER_IDAT;
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
break;
}
else if (ret == Z_BUF_ERROR)
break;
else
png_error(png_ptr, "Decompression Error");
}
if (!(png_ptr->zstream.avail_out))
{
if ((
#ifdef PNG_READ_INTERLACING_SUPPORTED
png_ptr->interlaced && png_ptr->pass > 6) ||
(!png_ptr->interlaced &&
#endif
png_ptr->row_number == png_ptr->num_rows))
{
if (png_ptr->zstream.avail_in)
png_warning(png_ptr, "Too much data in IDAT chunks");
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
break;
}
png_push_process_row(png_ptr);
png_ptr->zstream.avail_out =
(uInt) PNG_ROWBYTES(png_ptr->pixel_depth,
png_ptr->iwidth) + 1;
png_ptr->zstream.next_out = png_ptr->row_buf;
}
else
break;
/* Using Z_SYNC_FLUSH here means that an unterminated
* LZ stream can still be handled (a stream with a missing
* end code), otherwise (Z_NO_FLUSH) a future zlib
* implementation might defer output and, therefore,
* change the current behavior. (See comments in inflate.c
* for why this doesn't happen at present with zlib 1.2.5.)
*/
ret = inflate(&png_ptr->zstream, Z_SYNC_FLUSH);
/* Check for any failure before proceeding. */
if (ret != Z_OK && ret != Z_STREAM_END)
{
/* Terminate the decompression. */
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
/* This may be a truncated stream (missing or
* damaged end code). Treat that as a warning.
*/
if (png_ptr->row_number >= png_ptr->num_rows ||
png_ptr->pass > 6)
png_warning(png_ptr, "Truncated compressed data in IDAT");
else
png_error(png_ptr, "Decompression error in IDAT");
/* Skip the check on unprocessed input */
return;
}
/* Did inflate output any data? */
if (png_ptr->zstream.next_out != png_ptr->row_buf)
{
/* Is this unexpected data after the last row?
* If it is, artificially terminate the LZ output
* here.
*/
if (png_ptr->row_number >= png_ptr->num_rows ||
png_ptr->pass > 6)
{
/* Extra data. */
png_warning(png_ptr, "Extra compressed data in IDAT");
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
/* Do no more processing; skip the unprocessed
* input check below.
*/
return;
}
/* Do we have a complete row? */
if (png_ptr->zstream.avail_out == 0)
png_push_process_row(png_ptr);
}
/* And check for the end of the stream. */
if (ret == Z_STREAM_END)
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
}
/* All the data should have been processed, if anything
* is left at this point we have bytes of IDAT data
* after the zlib end code.
*/
if (png_ptr->zstream.avail_in > 0)
png_warning(png_ptr, "Extra compression data");
}
void /* PRIVATE */
@@ -900,8 +938,8 @@ png_push_process_row(png_structp png_ptr)
png_ptr->row_info.width);
png_read_filter_row(png_ptr, &(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->prev_row + 1,
(int)(png_ptr->row_buf[0]));
png_ptr->row_buf + 1, png_ptr->prev_row + 1,
(int)(png_ptr->row_buf[0]));
png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1);
@@ -915,7 +953,7 @@ png_push_process_row(png_structp png_ptr)
if (png_ptr->pass < 6)
/* old interface (pre-1.0.9):
png_do_read_interlace(&(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
*/
png_do_read_interlace(png_ptr);
@@ -950,7 +988,7 @@ png_push_process_row(png_structp png_ptr)
if (png_ptr->pass == 6 && png_ptr->height <= 4)
{
png_push_have_row(png_ptr, NULL);
png_push_have_row(png_ptr, NULL);
png_read_push_finish_row(png_ptr);
}
@@ -990,7 +1028,7 @@ png_push_process_row(png_structp png_ptr)
for (i = 0; i < 4 && png_ptr->pass == 2; i++)
{
png_push_have_row(png_ptr, NULL);
png_push_have_row(png_ptr, NULL);
png_read_push_finish_row(png_ptr);
}
@@ -1040,13 +1078,13 @@ png_push_process_row(png_structp png_ptr)
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
{
png_push_have_row(png_ptr, NULL);
png_push_have_row(png_ptr, NULL);
png_read_push_finish_row(png_ptr);
}
if (png_ptr->pass == 6) /* Pass 5 might be empty */
{
png_push_have_row(png_ptr, NULL);
png_push_have_row(png_ptr, NULL);
png_read_push_finish_row(png_ptr);
}
@@ -1065,7 +1103,7 @@ png_push_process_row(png_structp png_ptr)
if (png_ptr->pass == 6) /* Skip top generated row */
{
png_push_have_row(png_ptr, NULL);
png_push_have_row(png_ptr, NULL);
png_read_push_finish_row(png_ptr);
}
@@ -1079,7 +1117,7 @@ png_push_process_row(png_structp png_ptr)
if (png_ptr->pass != 6)
break;
png_push_have_row(png_ptr, NULL);
png_push_have_row(png_ptr, NULL);
png_read_push_finish_row(png_ptr);
}
}
@@ -1391,7 +1429,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
tmp = text;
text = (png_charp)png_malloc(png_ptr, text_size +
(png_ptr->zbuf_size
(png_ptr->zbuf_size
- png_ptr->zstream.avail_out + 1));
png_memcpy(text, tmp, text_size);
@@ -1613,7 +1651,7 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
}
#endif
png_memcpy((png_charp)png_ptr->unknown_chunk.name,
(png_charp)png_ptr->chunk_name,
(png_charp)png_ptr->chunk_name,
png_sizeof(png_ptr->unknown_chunk.name));
png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name) - 1]
= '\0';