/* pngpread.c - read a png file in push mode
*
- * Last changed in libpng 1.5.11 [June 14, 2012]
- * Copyright (c) 1998-2012 Glenn Randers-Pehrson
+ * Last changed in libpng 1.6.0 [February 14, 2013]
+ * Copyright (c) 1998-2013 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.)
*
#define PNG_ERROR_MODE 8
void PNGAPI
-png_process_data(png_structp png_ptr, png_infop info_ptr,
+png_process_data(png_structrp png_ptr, png_inforp info_ptr,
png_bytep buffer, png_size_t buffer_size)
{
if (png_ptr == NULL || info_ptr == NULL)
}
png_size_t PNGAPI
-png_process_data_pause(png_structp png_ptr, int save)
+png_process_data_pause(png_structrp png_ptr, int save)
{
if (png_ptr != NULL)
{
}
png_uint_32 PNGAPI
-png_process_data_skip(png_structp png_ptr)
+png_process_data_skip(png_structrp png_ptr)
{
png_uint_32 remaining = 0;
* doing before we ran out of data...
*/
void /* PRIVATE */
-png_process_some_data(png_structp png_ptr, png_infop info_ptr)
+png_process_some_data(png_structrp png_ptr, png_inforp info_ptr)
{
if (png_ptr == NULL)
return;
* routine.
*/
void /* PRIVATE */
-png_push_read_sig(png_structp png_ptr, png_infop info_ptr)
+png_push_read_sig(png_structrp png_ptr, png_inforp info_ptr)
{
png_size_t num_checked = png_ptr->sig_bytes,
- num_to_check = 8 - num_checked;
+ num_to_check = 8 - num_checked;
if (png_ptr->buffer_size < num_to_check)
{
else
png_error(png_ptr, "PNG file corrupted by ASCII conversion");
}
-
else
{
if (png_ptr->sig_bytes >= 8)
}
void /* PRIVATE */
-png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
+png_push_read_chunk(png_structrp png_ptr, png_inforp info_ptr)
{
png_uint_32 chunk_name;
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+ int keep; /* unknown handling method */
+#endif
/* First we make sure we have enough data for the 4 byte chunk name
* and the 4 byte chunk length before proceeding with decoding the
if (chunk_name == png_IDAT)
{
- /* This is here above the if/else case statement below because if the
- * unknown handling marks 'IDAT' as unknown then the IDAT handling case is
- * completely skipped.
- *
- * TODO: there must be a better way of doing this.
- */
if (png_ptr->mode & PNG_AFTER_IDAT)
png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
+
+ /* If we reach an IDAT chunk, this means we have read all of the
+ * header chunks, and we can start reading the image (or if this
+ * is called after the image has been read - we have an error).
+ */
+ if (!(png_ptr->mode & PNG_HAVE_IHDR))
+ png_error(png_ptr, "Missing IHDR before IDAT");
+
+ else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+ !(png_ptr->mode & PNG_HAVE_PLTE))
+ png_error(png_ptr, "Missing PLTE before IDAT");
+
+ png_ptr->mode |= PNG_HAVE_IDAT;
+
+ if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
+ if (png_ptr->push_length == 0)
+ return;
+
+ if (png_ptr->mode & PNG_AFTER_IDAT)
+ png_benign_error(png_ptr, "Too many IDATs found");
}
if (chunk_name == png_IHDR)
}
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
- else if (png_chunk_unknown_handling(png_ptr, chunk_name))
+ else if ((keep = png_chunk_unknown_handling(png_ptr, chunk_name)) != 0)
{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
return;
}
- if (chunk_name == png_IDAT)
- png_ptr->mode |= PNG_HAVE_IDAT;
-
- png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
+ png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length, keep);
if (chunk_name == png_PLTE)
png_ptr->mode |= PNG_HAVE_PLTE;
-
- else if (chunk_name == png_IDAT)
- {
- if (!(png_ptr->mode & PNG_HAVE_IHDR))
- png_error(png_ptr, "Missing IHDR before IDAT");
-
- else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
- !(png_ptr->mode & PNG_HAVE_PLTE))
- png_error(png_ptr, "Missing PLTE before IDAT");
- }
}
-#endif
+#endif
else if (chunk_name == png_PLTE)
{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
else if (chunk_name == png_IDAT)
{
- /* If we reach an IDAT chunk, this means we have read all of the
- * header chunks, and we can start reading the image (or if this
- * is called after the image has been read - we have an error).
- */
-
- if (!(png_ptr->mode & PNG_HAVE_IHDR))
- png_error(png_ptr, "Missing IHDR before IDAT");
-
- else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
- !(png_ptr->mode & PNG_HAVE_PLTE))
- png_error(png_ptr, "Missing PLTE before IDAT");
-
- if (png_ptr->mode & PNG_HAVE_IDAT)
- {
- if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
- if (png_ptr->push_length == 0)
- return;
-
- if (png_ptr->mode & PNG_AFTER_IDAT)
- png_benign_error(png_ptr, "Too many IDATs found");
- }
-
png_ptr->idat_size = png_ptr->push_length;
- png_ptr->mode |= PNG_HAVE_IDAT;
png_ptr->process_mode = PNG_READ_IDAT_MODE;
png_push_have_info(png_ptr, info_ptr);
png_ptr->zstream.avail_out =
}
#endif
-
else
{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
png_push_save_buffer(png_ptr);
return;
}
- png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
+ png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length,
+ PNG_HANDLE_CHUNK_AS_DEFAULT);
}
png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
}
void /* PRIVATE */
-png_push_crc_skip(png_structp png_ptr, png_uint_32 skip)
+png_push_crc_skip(png_structrp png_ptr, png_uint_32 skip)
{
png_ptr->process_mode = PNG_SKIP_MODE;
png_ptr->skip_length = skip;
}
void /* PRIVATE */
-png_push_crc_finish(png_structp png_ptr)
+png_push_crc_finish(png_structrp png_ptr)
{
if (png_ptr->skip_length && png_ptr->save_buffer_size)
{
png_ptr->save_buffer_size -= save_size;
png_ptr->save_buffer_ptr += save_size;
}
-
if (png_ptr->skip_length && png_ptr->current_buffer_size)
{
png_size_t save_size = png_ptr->current_buffer_size;
png_ptr->current_buffer_size -= save_size;
png_ptr->current_buffer_ptr += save_size;
}
-
if (!png_ptr->skip_length)
{
if (png_ptr->buffer_size < 4)
return;
ptr = buffer;
-
if (png_ptr->save_buffer_size)
{
png_size_t save_size;
else
save_size = png_ptr->save_buffer_size;
- png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size);
+ memcpy(ptr, png_ptr->save_buffer_ptr, save_size);
length -= save_size;
ptr += save_size;
png_ptr->buffer_size -= save_size;
png_ptr->save_buffer_size -= save_size;
png_ptr->save_buffer_ptr += save_size;
}
-
if (length && png_ptr->current_buffer_size)
{
png_size_t save_size;
else
save_size = png_ptr->current_buffer_size;
- png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size);
+ memcpy(ptr, png_ptr->current_buffer_ptr, save_size);
png_ptr->buffer_size -= save_size;
png_ptr->current_buffer_size -= save_size;
png_ptr->current_buffer_ptr += save_size;
}
void /* PRIVATE */
-png_push_save_buffer(png_structp png_ptr)
+png_push_save_buffer(png_structrp png_ptr)
{
if (png_ptr->save_buffer_size)
{
png_bytep dp;
istop = png_ptr->save_buffer_size;
-
for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer;
i < istop; i++, sp++, dp++)
{
}
}
}
-
if (png_ptr->save_buffer_size + png_ptr->current_buffer_size >
png_ptr->save_buffer_max)
{
new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
old_buffer = png_ptr->save_buffer;
- png_ptr->save_buffer = (png_bytep)png_malloc_warn(png_ptr, new_max);
+ png_ptr->save_buffer = (png_bytep)png_malloc_warn(png_ptr,
+ (png_size_t)new_max);
if (png_ptr->save_buffer == NULL)
{
png_error(png_ptr, "Insufficient memory for save_buffer");
}
- png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size);
+ memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size);
png_free(png_ptr, old_buffer);
png_ptr->save_buffer_max = new_max;
}
-
if (png_ptr->current_buffer_size)
{
- png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size,
+ memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size,
png_ptr->current_buffer_ptr, png_ptr->current_buffer_size);
png_ptr->save_buffer_size += png_ptr->current_buffer_size;
png_ptr->current_buffer_size = 0;
}
-
png_ptr->save_buffer_ptr = png_ptr->save_buffer;
png_ptr->buffer_size = 0;
}
void /* PRIVATE */
-png_push_restore_buffer(png_structp png_ptr, png_bytep buffer,
+png_push_restore_buffer(png_structrp png_ptr, png_bytep buffer,
png_size_t buffer_length)
{
png_ptr->current_buffer = buffer;
}
void /* PRIVATE */
-png_push_read_IDAT(png_structp png_ptr)
+png_push_read_IDAT(png_structrp png_ptr)
{
if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
{
{
png_ptr->process_mode = PNG_READ_CHUNK_MODE;
- if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
+ if (!(png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED))
png_error(png_ptr, "Not enough compressed data");
return;
png_ptr->current_buffer_size -= save_size;
png_ptr->current_buffer_ptr += save_size;
}
-
if (!png_ptr->idat_size)
{
if (png_ptr->buffer_size < 4)
png_crc_finish(png_ptr, 0);
png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
png_ptr->mode |= PNG_AFTER_IDAT;
+ png_ptr->zowner = 0;
}
}
void /* PRIVATE */
-png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
+png_process_IDAT_data(png_structrp png_ptr, png_bytep buffer,
png_size_t buffer_length)
{
/* The caller checks for a non-zero buffer length. */
* handle the uncompressed results.
*/
png_ptr->zstream.next_in = buffer;
+ /* TODO: WARNING: TRUNCATION ERROR: DANGER WILL ROBINSON: */
png_ptr->zstream.avail_in = (uInt)buffer_length;
/* 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))
+ !(png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED))
{
int ret;
*/
if (!(png_ptr->zstream.avail_out > 0))
{
- png_ptr->zstream.avail_out =
- (uInt) PNG_ROWBYTES(png_ptr->pixel_depth,
- png_ptr->iwidth) + 1;
+ /* TODO: WARNING: TRUNCATION ERROR: DANGER WILL ROBINSON: */
+ 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;
}
if (ret != Z_OK && ret != Z_STREAM_END)
{
/* Terminate the decompression. */
- png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+ png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED;
+ png_ptr->zowner = 0;
/* This may be a truncated stream (missing or
* damaged end code). Treat that as a warning.
{
/* Extra data. */
png_warning(png_ptr, "Extra compressed data in IDAT");
- png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+ png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED;
+ png_ptr->zowner = 0;
/* Do no more processing; skip the unprocessed
* input check below.
/* And check for the end of the stream. */
if (ret == Z_STREAM_END)
- png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+ png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED;
}
/* All the data should have been processed, if anything
}
void /* PRIVATE */
-png_push_process_row(png_structp png_ptr)
+png_push_process_row(png_structrp png_ptr)
{
/* 1.5.6: row_info moved out of png_struct to a local here. */
png_row_info row_info;
* it may not be in the future, so this was changed just to copy the
* interlaced row count:
*/
- png_memcpy(png_ptr->prev_row, png_ptr->row_buf, row_info.rowbytes + 1);
+ memcpy(png_ptr->prev_row, png_ptr->row_buf, row_info.rowbytes + 1);
#ifdef PNG_READ_TRANSFORMS_SUPPORTED
if (png_ptr->transformations)
}
void /* PRIVATE */
-png_read_push_finish_row(png_structp png_ptr)
+png_read_push_finish_row(png_structrp png_ptr)
{
#ifdef PNG_READ_INTERLACING_SUPPORTED
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Start of interlace block */
- static PNG_CONST png_byte FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+ static PNG_CONST png_byte png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
/* Offset to next interlace block */
- static PNG_CONST png_byte FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+ static PNG_CONST png_byte png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
/* Start of interlace block in the y direction */
- static PNG_CONST png_byte FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+ static PNG_CONST png_byte png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
/* Offset to next interlace block in the y direction */
- static PNG_CONST png_byte FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
+ static PNG_CONST png_byte png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
/* Height of interlace block. This is not currently used - if you need
* it, uncomment it here and in png.h
- static PNG_CONST png_byte FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
+ static PNG_CONST png_byte png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
*/
#endif
if (png_ptr->interlaced)
{
png_ptr->row_number = 0;
- png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
+ memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
do
{
}
void /* PRIVATE */
-png_push_have_info(png_structp png_ptr, png_infop info_ptr)
+png_push_have_info(png_structrp png_ptr, png_inforp info_ptr)
{
if (png_ptr->info_fn != NULL)
(*(png_ptr->info_fn))(png_ptr, info_ptr);
}
void /* PRIVATE */
-png_push_have_end(png_structp png_ptr, png_infop info_ptr)
+png_push_have_end(png_structrp png_ptr, png_inforp info_ptr)
{
if (png_ptr->end_fn != NULL)
(*(png_ptr->end_fn))(png_ptr, info_ptr);
}
void /* PRIVATE */
-png_push_have_row(png_structp png_ptr, png_bytep row)
+png_push_have_row(png_structrp png_ptr, png_bytep row)
{
if (png_ptr->row_fn != NULL)
(*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number,
#ifdef PNG_READ_INTERLACING_SUPPORTED
void PNGAPI
-png_progressive_combine_row (png_structp png_ptr, png_bytep old_row,
+png_progressive_combine_row(png_const_structrp png_ptr, png_bytep old_row,
png_const_bytep new_row)
{
if (png_ptr == NULL)
#endif /* PNG_READ_INTERLACING_SUPPORTED */
void PNGAPI
-png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
+png_set_progressive_read_fn(png_structrp png_ptr, png_voidp progressive_ptr,
png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
png_progressive_end_ptr end_fn)
{
}
png_voidp PNGAPI
-png_get_progressive_ptr(png_const_structp png_ptr)
+png_get_progressive_ptr(png_const_structrp png_ptr)
{
if (png_ptr == NULL)
return (NULL);
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