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Imported from libpng-0.82.tar

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This commit is contained in:
Guy Schalnat
1995-11-28 11:22:13 -06:00
committed by Glenn Randers-Pehrson
parent 51f0eb4584
commit 0f71645dfe
16 changed files with 1233 additions and 475 deletions
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33
pngwutil.c
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@@ -39,7 +39,7 @@ png_write_uint_32(png_struct *png_ptr, png_uint_32 i)
buf[1] = (png_byte)((i >> 16) & 0xff);
buf[2] = (png_byte)((i >> 8) & 0xff);
buf[3] = (png_byte)(i & 0xff);
png_write_data(png_ptr, buf, 4);
(*(png_ptr->write_data_fn))(png_ptr, buf, 4);
}
/* write a 16 bit number */
@@ -50,7 +50,7 @@ png_write_uint_16(png_struct *png_ptr, png_uint_16 i)
buf[0] = (png_byte)((i >> 8) & 0xff);
buf[1] = (png_byte)(i & 0xff);
png_write_data(png_ptr, buf, 2);
(*(png_ptr->write_data_fn))(png_ptr, buf, 2);
}
/* Write a png chunk all at once. The type is an array of ASCII characters
@@ -68,7 +68,7 @@ png_write_chunk(png_struct *png_ptr, png_byte *type,
/* write length */
png_write_uint_32(png_ptr, length);
/* write chunk name */
png_write_data(png_ptr, type, (png_uint_32)4);
(*(png_ptr->write_data_fn))(png_ptr, type, (png_uint_32)4);
/* reset the crc and run the chunk name over it */
png_reset_crc(png_ptr);
png_calculate_crc(png_ptr, type, (png_uint_32)4);
@@ -76,7 +76,7 @@ png_write_chunk(png_struct *png_ptr, png_byte *type,
if (length)
{
png_calculate_crc(png_ptr, data, length);
png_write_data(png_ptr, data, length);
(*(png_ptr->write_data_fn))(png_ptr, data, length);
}
/* write the crc */
png_write_uint_32(png_ptr, ~png_ptr->crc);
@@ -92,7 +92,7 @@ png_write_chunk_start(png_struct *png_ptr, png_byte *type,
/* write the length */
png_write_uint_32(png_ptr, total_length);
/* write the chunk name */
png_write_data(png_ptr, type, (png_uint_32)4);
(*(png_ptr->write_data_fn))(png_ptr, type, (png_uint_32)4);
/* reset the crc and run it over the chunk name */
png_reset_crc(png_ptr);
png_calculate_crc(png_ptr, type, (png_uint_32)4);
@@ -109,7 +109,7 @@ png_write_chunk_data(png_struct *png_ptr, png_bytef *data, png_uint_32 length)
if (length)
{
png_calculate_crc(png_ptr, data, length);
png_write_data(png_ptr, data, length);
(*(png_ptr->write_data_fn))(png_ptr, data, length);
}
}
@@ -126,7 +126,7 @@ void
png_write_sig(png_struct *png_ptr)
{
/* write the 8 byte signature */
png_write_data(png_ptr, png_sig, (png_uint_32)8);
(*(png_ptr->write_data_fn))(png_ptr, png_sig, (png_uint_32)8);
}
/* Write the IHDR chunk, and update the png_struct with the necessary
@@ -175,10 +175,10 @@ png_write_IHDR(png_struct *png_ptr, png_uint_32 width, png_uint_32 height,
/* set the usr info, so any transformations can modify it */
png_ptr->usr_width = png_ptr->width;
png_ptr->usr_bit_depth = png_ptr->bit_depth;
png_ptr->usr_channels = png_ptr->channels;
png_ptr->usr_channels = png_ptr->channels;
/* write the chunk */
png_write_chunk(png_ptr, png_IHDR, buf, (png_uint_32)13);
png_write_chunk(png_ptr, png_IHDR, buf, (png_uint_32)13);
/* initialize zlib with png info */
png_ptr->zstream = &(png_ptr->zstream_struct);
@@ -462,9 +462,9 @@ png_write_zTXt(png_struct *png_ptr, charf *key, charf *text,
{
/* error */
if (png_ptr->zstream->msg)
png_error(png_ptr, png_ptr->zstream->msg);
(*(png_ptr->error_fn))(png_ptr, png_ptr->zstream->msg);
else
png_error(png_ptr, "zlib error");
(*(png_ptr->error_fn))(png_ptr, "zlib error");
}
/* check to see if we need more room */
if (!png_ptr->zstream->avail_out && png_ptr->zstream->avail_in)
@@ -508,9 +508,9 @@ png_write_zTXt(png_struct *png_ptr, charf *key, charf *text,
{
/* we got an error */
if (png_ptr->zstream->msg)
png_error(png_ptr, png_ptr->zstream->msg);
(*(png_ptr->error_fn))(png_ptr, png_ptr->zstream->msg);
else
png_error(png_ptr, "zlib error");
(*(png_ptr->error_fn))(png_ptr, "zlib error");
}
/* check to see if we need more room */
@@ -689,7 +689,7 @@ png_write_finish_row(png_struct *png_ptr)
/* next row */
png_ptr->row_number++;
/* see if we are done */
if (png_ptr->row_number < png_ptr->num_rows)
if (png_ptr->row_number < png_ptr->num_rows || png_ptr->mode > PNG_HAVE_IDAT)
return;
/* if interlaced, go to next pass */
@@ -740,9 +740,9 @@ png_write_finish_row(png_struct *png_ptr)
if (ret != Z_OK && ret != Z_STREAM_END)
{
if (png_ptr->zstream->msg)
png_error(png_ptr, png_ptr->zstream->msg);
(*(png_ptr->error_fn))(png_ptr, png_ptr->zstream->msg);
else
png_error(png_ptr, "zlib error");
(*(png_ptr->error_fn))(png_ptr, "zlib error");
}
/* check to see if we need more room */
if (!png_ptr->zstream->avail_out && ret == Z_OK)
@@ -761,6 +761,7 @@ png_write_finish_row(png_struct *png_ptr)
}
deflateReset(png_ptr->zstream);
png_ptr->mode = PNG_AFTER_IDAT;
}
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)