#include "pngpriv.h"
#ifdef PNG_READ_SUPPORTED
png_uint_32 PNGAPI
png_get_uint_31(png_const_structrp png_ptr, png_const_bytep buf)
{
png_uint_32 uval = png_get_uint_32(buf);
if (uval > PNG_UINT_31_MAX)
png_error(png_ptr, "PNG unsigned integer out of range");
return (uval);
}
#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_READ_cHRM_SUPPORTED)
#define PNG_FIXED_ERROR (-1)
static png_fixed_point
png_get_fixed_point(png_structrp png_ptr, png_const_bytep buf)
{
png_uint_32 uval = png_get_uint_32(buf);
if (uval <= PNG_UINT_31_MAX)
return (png_fixed_point)uval;
if (png_ptr != NULL)
png_warning(png_ptr, "PNG fixed point integer out of range");
return PNG_FIXED_ERROR;
}
#endif
#ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED
png_uint_32 (PNGAPI
png_get_uint_32)(png_const_bytep buf)
{
png_uint_32 uval =
((png_uint_32)(*(buf )) << 24) +
((png_uint_32)(*(buf + 1)) << 16) +
((png_uint_32)(*(buf + 2)) << 8) +
((png_uint_32)(*(buf + 3)) ) ;
return uval;
}
png_int_32 (PNGAPI
png_get_int_32)(png_const_bytep buf)
{
png_uint_32 uval = png_get_uint_32(buf);
if ((uval & 0x80000000) == 0)
return uval;
uval = (uval ^ 0xffffffff) + 1;
if ((uval & 0x80000000) == 0)
return -(png_int_32)uval;
return 0;
}
png_uint_16 (PNGAPI
png_get_uint_16)(png_const_bytep buf)
{
unsigned int val =
((unsigned int)(*buf) << 8) +
((unsigned int)(*(buf + 1)));
return (png_uint_16)val;
}
#endif
void
png_read_sig(png_structrp png_ptr, png_inforp info_ptr)
{
png_size_t num_checked, num_to_check;
if (png_ptr->sig_bytes >= 8)
return;
num_checked = png_ptr->sig_bytes;
num_to_check = 8 - num_checked;
#ifdef PNG_IO_STATE_SUPPORTED
png_ptr->io_state = PNG_IO_READING | PNG_IO_SIGNATURE;
#endif
png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
png_ptr->sig_bytes = 8;
if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check) != 0)
{
if (num_checked < 4 &&
png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
png_error(png_ptr, "Not a PNG file");
else
png_error(png_ptr, "PNG file corrupted by ASCII conversion");
}
if (num_checked < 3)
png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
}
png_uint_32
png_read_chunk_header(png_structrp png_ptr)
{
png_byte buf[8];
png_uint_32 length;
#ifdef PNG_IO_STATE_SUPPORTED
png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_HDR;
#endif
png_read_data(png_ptr, buf, 8);
length = png_get_uint_31(png_ptr, buf);
png_ptr->chunk_name = PNG_CHUNK_FROM_STRING(buf+4);
png_debug2(0, "Reading %lx chunk, length = %lu",
(unsigned long)png_ptr->chunk_name, (unsigned long)length);
png_reset_crc(png_ptr);
png_calculate_crc(png_ptr, buf + 4, 4);
png_check_chunk_name(png_ptr, png_ptr->chunk_name);
#ifdef PNG_IO_STATE_SUPPORTED
png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_DATA;
#endif
return length;
}
void
png_crc_read(png_structrp png_ptr, png_bytep buf, png_uint_32 length)
{
if (png_ptr == NULL)
return;
png_read_data(png_ptr, buf, length);
png_calculate_crc(png_ptr, buf, length);
}
int
png_crc_finish(png_structrp png_ptr, png_uint_32 skip)
{
while (skip > 0)
{
png_uint_32 len;
png_byte tmpbuf[PNG_INFLATE_BUF_SIZE];
len = (sizeof tmpbuf);
if (len > skip)
len = skip;
skip -= len;
png_crc_read(png_ptr, tmpbuf, len);
}
if (png_crc_error(png_ptr) != 0)
{
if (PNG_CHUNK_ANCILLARY(png_ptr->chunk_name) != 0 ?
(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN) == 0 :
(png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE) != 0)
{
png_chunk_warning(png_ptr, "CRC error");
}
else
png_chunk_error(png_ptr, "CRC error");
return (1);
}
return (0);
}
int
png_crc_error(png_structrp png_ptr)
{
png_byte crc_bytes[4];
png_uint_32 crc;
int need_crc = 1;
if (PNG_CHUNK_ANCILLARY(png_ptr->chunk_name) != 0)
{
if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
(PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
need_crc = 0;
}
else
{
if ((png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) != 0)
need_crc = 0;
}
#ifdef PNG_IO_STATE_SUPPORTED
png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_CRC;
#endif
png_read_data(png_ptr, crc_bytes, 4);
if (need_crc != 0)
{
crc = png_get_uint_32(crc_bytes);
return ((int)(crc != png_ptr->crc));
}
else
return (0);
}
#if defined(PNG_READ_iCCP_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) ||\
defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_READ_sCAL_SUPPORTED) ||\
defined(PNG_READ_sPLT_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) ||\
defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_SEQUENTIAL_READ_SUPPORTED)
static png_bytep
png_read_buffer(png_structrp png_ptr, png_alloc_size_t new_size, int warn)
{
png_bytep buffer = png_ptr->read_buffer;
if (buffer != NULL && new_size > png_ptr->read_buffer_size)
{
png_ptr->read_buffer = NULL;
png_ptr->read_buffer = NULL;
png_ptr->read_buffer_size = 0;
png_free(png_ptr, buffer);
buffer = NULL;
}
if (buffer == NULL)
{
buffer = png_voidcast(png_bytep, png_malloc_base(png_ptr, new_size));
if (buffer != NULL)
{
png_ptr->read_buffer = buffer;
png_ptr->read_buffer_size = new_size;
}
else if (warn < 2)
{
if (warn != 0)
png_chunk_warning(png_ptr, "insufficient memory to read chunk");
else
png_chunk_error(png_ptr, "insufficient memory to read chunk");
}
}
return buffer;
}
#endif
static int
png_inflate_claim(png_structrp png_ptr, png_uint_32 owner)
{
if (png_ptr->zowner != 0)
{
char msg[64];
PNG_STRING_FROM_CHUNK(msg, png_ptr->zowner);
(void)png_safecat(msg, (sizeof msg), 4, " using zstream");
#if PNG_RELEASE_BUILD
png_chunk_warning(png_ptr, msg);
png_ptr->zowner = 0;
#else
png_chunk_error(png_ptr, msg);
#endif
}
{
int ret;
#if PNG_ZLIB_VERNUM >= 0x1240
# if defined(PNG_SET_OPTION_SUPPORTED) && defined(PNG_MAXIMUM_INFLATE_WINDOW)
int window_bits;
if (((png_ptr->options >> PNG_MAXIMUM_INFLATE_WINDOW) & 3) ==
PNG_OPTION_ON)
{
window_bits = 15;
png_ptr->zstream_start = 0;
}
else
{
window_bits = 0;
png_ptr->zstream_start = 1;
}
# else
# define window_bits 0
# endif
#endif
png_ptr->zstream.next_in = NULL;
png_ptr->zstream.avail_in = 0;
png_ptr->zstream.next_out = NULL;
png_ptr->zstream.avail_out = 0;
if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) != 0)
{
#if PNG_ZLIB_VERNUM < 0x1240
ret = inflateReset(&png_ptr->zstream);
#else
ret = inflateReset2(&png_ptr->zstream, window_bits);
#endif
}
else
{
#if PNG_ZLIB_VERNUM < 0x1240
ret = inflateInit(&png_ptr->zstream);
#else
ret = inflateInit2(&png_ptr->zstream, window_bits);
#endif
if (ret == Z_OK)
png_ptr->flags |= PNG_FLAG_ZSTREAM_INITIALIZED;
}
if (ret == Z_OK)
png_ptr->zowner = owner;
else
png_zstream_error(png_ptr, ret);
return ret;
}
#ifdef window_bits
# undef window_bits
#endif
}
#if PNG_ZLIB_VERNUM >= 0x1240
int
png_zlib_inflate(png_structrp png_ptr, int flush)
{
if (png_ptr->zstream_start && png_ptr->zstream.avail_in > 0)
{
if ((*png_ptr->zstream.next_in >> 4) > 7)
{
png_ptr->zstream.msg = "invalid window size (libpng)";
return Z_DATA_ERROR;
}
png_ptr->zstream_start = 0;
}
return inflate(&png_ptr->zstream, flush);
}
#endif
#ifdef PNG_READ_COMPRESSED_TEXT_SUPPORTED
static int
png_inflate(png_structrp png_ptr, png_uint_32 owner, int finish,
png_const_bytep input, png_uint_32p input_size_ptr,
png_bytep output, png_alloc_size_t *output_size_ptr)
{
if (png_ptr->zowner == owner)
{
int ret;
png_alloc_size_t avail_out = *output_size_ptr;
png_uint_32 avail_in = *input_size_ptr;
png_ptr->zstream.next_in = PNGZ_INPUT_CAST(input);
png_ptr->zstream.avail_in = 0;
png_ptr->zstream.avail_out = 0;
if (output != NULL)
png_ptr->zstream.next_out = output;
do
{
uInt avail;
Byte local_buffer[PNG_INFLATE_BUF_SIZE];
avail_in += png_ptr->zstream.avail_in;
avail = ZLIB_IO_MAX;
if (avail_in < avail)
avail = (uInt)avail_in;
avail_in -= avail;
png_ptr->zstream.avail_in = avail;
avail_out += png_ptr->zstream.avail_out;
avail = ZLIB_IO_MAX;
if (output == NULL)
{
png_ptr->zstream.next_out = local_buffer;
if ((sizeof local_buffer) < avail)
avail = (sizeof local_buffer);
}
if (avail_out < avail)
avail = (uInt)avail_out;
png_ptr->zstream.avail_out = avail;
avail_out -= avail;
ret = PNG_INFLATE(png_ptr, avail_out > 0 ? Z_NO_FLUSH :
(finish ? Z_FINISH : Z_SYNC_FLUSH));
} while (ret == Z_OK);
if (output == NULL)
png_ptr->zstream.next_out = NULL;
avail_in += png_ptr->zstream.avail_in;
avail_out += png_ptr->zstream.avail_out;
if (avail_out > 0)
*output_size_ptr -= avail_out;
if (avail_in > 0)
*input_size_ptr -= avail_in;
png_zstream_error(png_ptr, ret);
return ret;
}
else
{
png_ptr->zstream.msg = PNGZ_MSG_CAST("zstream unclaimed");
return Z_STREAM_ERROR;
}
}
static int
png_decompress_chunk(png_structrp png_ptr,
png_uint_32 chunklength, png_uint_32 prefix_size,
png_alloc_size_t *newlength ,
int terminate )
{
png_alloc_size_t limit = PNG_SIZE_MAX;
# ifdef PNG_SET_USER_LIMITS_SUPPORTED
if (png_ptr->user_chunk_malloc_max > 0 &&
png_ptr->user_chunk_malloc_max < limit)
limit = png_ptr->user_chunk_malloc_max;
# elif PNG_USER_CHUNK_MALLOC_MAX > 0
if (PNG_USER_CHUNK_MALLOC_MAX < limit)
limit = PNG_USER_CHUNK_MALLOC_MAX;
# endif
if (limit >= prefix_size + (terminate != 0))
{
int ret;
limit -= prefix_size + (terminate != 0);
if (limit < *newlength)
*newlength = limit;
ret = png_inflate_claim(png_ptr, png_ptr->chunk_name);
if (ret == Z_OK)
{
png_uint_32 lzsize = chunklength - prefix_size;
ret = png_inflate(png_ptr, png_ptr->chunk_name, 1,
png_ptr->read_buffer + prefix_size, &lzsize,
NULL, newlength);
if (ret == Z_STREAM_END)
{
if (inflateReset(&png_ptr->zstream) == Z_OK)
{
png_alloc_size_t new_size = *newlength;
png_alloc_size_t buffer_size = prefix_size + new_size +
(terminate != 0);
png_bytep text = png_voidcast(png_bytep, png_malloc_base(png_ptr,
buffer_size));
if (text != NULL)
{
ret = png_inflate(png_ptr, png_ptr->chunk_name, 1,
png_ptr->read_buffer + prefix_size, &lzsize,
text + prefix_size, newlength);
if (ret == Z_STREAM_END)
{
if (new_size == *newlength)
{
if (terminate != 0)
text[prefix_size + *newlength] = 0;
if (prefix_size > 0)
memcpy(text, png_ptr->read_buffer, prefix_size);
{
png_bytep old_ptr = png_ptr->read_buffer;
png_ptr->read_buffer = text;
png_ptr->read_buffer_size = buffer_size;
text = old_ptr;
}
}
else
{
ret = PNG_UNEXPECTED_ZLIB_RETURN;
}
}
else if (ret == Z_OK)
ret = PNG_UNEXPECTED_ZLIB_RETURN;
png_free(png_ptr, text);
if (ret == Z_STREAM_END &&
chunklength - prefix_size != lzsize)
png_chunk_benign_error(png_ptr, "extra compressed data");
}
else
{
ret = Z_MEM_ERROR;
png_zstream_error(png_ptr, Z_MEM_ERROR);
}
}
else
{
png_zstream_error(png_ptr, ret);
if (ret == Z_STREAM_END)
ret = PNG_UNEXPECTED_ZLIB_RETURN;
}
}
else if (ret == Z_OK)
ret = PNG_UNEXPECTED_ZLIB_RETURN;
png_ptr->zowner = 0;
}
else if (ret == Z_STREAM_END)
ret = PNG_UNEXPECTED_ZLIB_RETURN;
return ret;
}
else
{
png_zstream_error(png_ptr, Z_MEM_ERROR);
return Z_MEM_ERROR;
}
}
#endif
#ifdef PNG_READ_iCCP_SUPPORTED
static int
png_inflate_read(png_structrp png_ptr, png_bytep read_buffer, uInt read_size,
png_uint_32p chunk_bytes, png_bytep next_out, png_alloc_size_t *out_size,
int finish)
{
if (png_ptr->zowner == png_ptr->chunk_name)
{
int ret;
png_ptr->zstream.next_out = next_out;
png_ptr->zstream.avail_out = 0;
do
{
if (png_ptr->zstream.avail_in == 0)
{
if (read_size > *chunk_bytes)
read_size = (uInt)*chunk_bytes;
*chunk_bytes -= read_size;
if (read_size > 0)
png_crc_read(png_ptr, read_buffer, read_size);
png_ptr->zstream.next_in = read_buffer;
png_ptr->zstream.avail_in = read_size;
}
if (png_ptr->zstream.avail_out == 0)
{
uInt avail = ZLIB_IO_MAX;
if (avail > *out_size)
avail = (uInt)*out_size;
*out_size -= avail;
png_ptr->zstream.avail_out = avail;
}
ret = PNG_INFLATE(png_ptr,
*chunk_bytes > 0 ? Z_NO_FLUSH : (finish ? Z_FINISH : Z_SYNC_FLUSH));
}
while (ret == Z_OK && (*out_size > 0 || png_ptr->zstream.avail_out > 0));
*out_size += png_ptr->zstream.avail_out;
png_ptr->zstream.avail_out = 0;
png_zstream_error(png_ptr, ret);
return ret;
}
else
{
png_ptr->zstream.msg = PNGZ_MSG_CAST("zstream unclaimed");
return Z_STREAM_ERROR;
}
}
#endif
void
png_handle_IHDR(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_byte buf[13];
png_uint_32 width, height;
int bit_depth, color_type, compression_type, filter_type;
int interlace_type;
png_debug(1, "in png_handle_IHDR");
if ((png_ptr->mode & PNG_HAVE_IHDR) != 0)
png_chunk_error(png_ptr, "out of place");
if (length != 13)
png_chunk_error(png_ptr, "invalid");
png_ptr->mode |= PNG_HAVE_IHDR;
png_crc_read(png_ptr, buf, 13);
png_crc_finish(png_ptr, 0);
width = png_get_uint_31(png_ptr, buf);
height = png_get_uint_31(png_ptr, buf + 4);
bit_depth = buf[8];
color_type = buf[9];
compression_type = buf[10];
filter_type = buf[11];
interlace_type = buf[12];
png_ptr->width = width;
png_ptr->height = height;
png_ptr->bit_depth = (png_byte)bit_depth;
png_ptr->interlaced = (png_byte)interlace_type;
png_ptr->color_type = (png_byte)color_type;
#ifdef PNG_MNG_FEATURES_SUPPORTED
png_ptr->filter_type = (png_byte)filter_type;
#endif
png_ptr->compression_type = (png_byte)compression_type;
switch (png_ptr->color_type)
{
default:
case PNG_COLOR_TYPE_GRAY:
case PNG_COLOR_TYPE_PALETTE:
png_ptr->channels = 1;
break;
case PNG_COLOR_TYPE_RGB:
png_ptr->channels = 3;
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
png_ptr->channels = 2;
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
png_ptr->channels = 4;
break;
}
png_ptr->pixel_depth = (png_byte)(png_ptr->bit_depth * png_ptr->channels);
png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->width);
png_debug1(3, "bit_depth = %d", png_ptr->bit_depth);
png_debug1(3, "channels = %d", png_ptr->channels);
png_debug1(3, "rowbytes = %lu", (unsigned long)png_ptr->rowbytes);
png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
color_type, interlace_type, compression_type, filter_type);
}
void
png_handle_PLTE(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_color palette[PNG_MAX_PALETTE_LENGTH];
int max_palette_length, num, i;
#ifdef PNG_POINTER_INDEXING_SUPPORTED
png_colorp pal_ptr;
#endif
png_debug(1, "in png_handle_PLTE");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if ((png_ptr->mode & PNG_HAVE_PLTE) != 0)
png_chunk_error(png_ptr, "duplicate");
else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of place");
return;
}
png_ptr->mode |= PNG_HAVE_PLTE;
if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) == 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "ignored in grayscale PNG");
return;
}
#ifndef PNG_READ_OPT_PLTE_SUPPORTED
if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
{
png_crc_finish(png_ptr, length);
return;
}
#endif
if (length > 3*PNG_MAX_PALETTE_LENGTH || length % 3)
{
png_crc_finish(png_ptr, length);
if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
png_chunk_benign_error(png_ptr, "invalid");
else
png_chunk_error(png_ptr, "invalid");
return;
}
num = (int)length / 3;
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
max_palette_length = (1 << png_ptr->bit_depth);
else
max_palette_length = PNG_MAX_PALETTE_LENGTH;
if (num > max_palette_length)
num = max_palette_length;
#ifdef PNG_POINTER_INDEXING_SUPPORTED
for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++)
{
png_byte buf[3];
png_crc_read(png_ptr, buf, 3);
pal_ptr->red = buf[0];
pal_ptr->green = buf[1];
pal_ptr->blue = buf[2];
}
#else
for (i = 0; i < num; i++)
{
png_byte buf[3];
png_crc_read(png_ptr, buf, 3);
palette[i].red = buf[0];
palette[i].green = buf[1];
palette[i].blue = buf[2];
}
#endif
#ifndef PNG_READ_OPT_PLTE_SUPPORTED
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
#endif
{
png_crc_finish(png_ptr, (int) length - num * 3);
}
#ifndef PNG_READ_OPT_PLTE_SUPPORTED
else if (png_crc_error(png_ptr) != 0)
{
if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_USE) == 0)
{
if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN) != 0)
return;
else
png_chunk_error(png_ptr, "CRC error");
}
else if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN) == 0)
png_chunk_warning(png_ptr, "CRC error");
}
#endif
png_set_PLTE(png_ptr, info_ptr, palette, num);
#ifdef PNG_READ_tRNS_SUPPORTED
if (png_ptr->num_trans > 0 ||
(info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS) != 0))
{
png_ptr->num_trans = 0;
if (info_ptr != NULL)
info_ptr->num_trans = 0;
png_chunk_benign_error(png_ptr, "tRNS must be after");
}
#endif
#ifdef PNG_READ_hIST_SUPPORTED
if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST) != 0)
png_chunk_benign_error(png_ptr, "hIST must be after");
#endif
#ifdef PNG_READ_bKGD_SUPPORTED
if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD) != 0)
png_chunk_benign_error(png_ptr, "bKGD must be after");
#endif
}
void
png_handle_IEND(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_debug(1, "in png_handle_IEND");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0 ||
(png_ptr->mode & PNG_HAVE_IDAT) == 0)
png_chunk_error(png_ptr, "out of place");
png_ptr->mode |= (PNG_AFTER_IDAT | PNG_HAVE_IEND);
png_crc_finish(png_ptr, length);
if (length != 0)
png_chunk_benign_error(png_ptr, "invalid");
PNG_UNUSED(info_ptr)
}
#ifdef PNG_READ_gAMA_SUPPORTED
void
png_handle_gAMA(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_fixed_point igamma;
png_byte buf[4];
png_debug(1, "in png_handle_gAMA");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if ((png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of place");
return;
}
if (length != 4)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "invalid");
return;
}
png_crc_read(png_ptr, buf, 4);
if (png_crc_finish(png_ptr, 0) != 0)
return;
igamma = png_get_fixed_point(NULL, buf);
png_colorspace_set_gamma(png_ptr, &png_ptr->colorspace, igamma);
png_colorspace_sync(png_ptr, info_ptr);
}
#endif
#ifdef PNG_READ_sBIT_SUPPORTED
void
png_handle_sBIT(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
unsigned int truelen, i;
png_byte sample_depth;
png_byte buf[4];
png_debug(1, "in png_handle_sBIT");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if ((png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of place");
return;
}
if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "duplicate");
return;
}
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
truelen = 3;
sample_depth = 8;
}
else
{
truelen = png_ptr->channels;
sample_depth = png_ptr->bit_depth;
}
if (length != truelen || length > 4)
{
png_chunk_benign_error(png_ptr, "invalid");
png_crc_finish(png_ptr, length);
return;
}
buf[0] = buf[1] = buf[2] = buf[3] = sample_depth;
png_crc_read(png_ptr, buf, truelen);
if (png_crc_finish(png_ptr, 0) != 0)
return;
for (i=0; i<truelen; ++i)
{
if (buf[i] == 0 || buf[i] > sample_depth)
{
png_chunk_benign_error(png_ptr, "invalid");
return;
}
}
if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
{
png_ptr->sig_bit.red = buf[0];
png_ptr->sig_bit.green = buf[1];
png_ptr->sig_bit.blue = buf[2];
png_ptr->sig_bit.alpha = buf[3];
}
else
{
png_ptr->sig_bit.gray = buf[0];
png_ptr->sig_bit.red = buf[0];
png_ptr->sig_bit.green = buf[0];
png_ptr->sig_bit.blue = buf[0];
png_ptr->sig_bit.alpha = buf[1];
}
png_set_sBIT(png_ptr, info_ptr, &(png_ptr->sig_bit));
}
#endif
#ifdef PNG_READ_cHRM_SUPPORTED
void
png_handle_cHRM(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_byte buf[32];
png_xy xy;
png_debug(1, "in png_handle_cHRM");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if ((png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of place");
return;
}
if (length != 32)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "invalid");
return;
}
png_crc_read(png_ptr, buf, 32);
if (png_crc_finish(png_ptr, 0) != 0)
return;
xy.whitex = png_get_fixed_point(NULL, buf);
xy.whitey = png_get_fixed_point(NULL, buf + 4);
xy.redx = png_get_fixed_point(NULL, buf + 8);
xy.redy = png_get_fixed_point(NULL, buf + 12);
xy.greenx = png_get_fixed_point(NULL, buf + 16);
xy.greeny = png_get_fixed_point(NULL, buf + 20);
xy.bluex = png_get_fixed_point(NULL, buf + 24);
xy.bluey = png_get_fixed_point(NULL, buf + 28);
if (xy.whitex == PNG_FIXED_ERROR ||
xy.whitey == PNG_FIXED_ERROR ||
xy.redx == PNG_FIXED_ERROR ||
xy.redy == PNG_FIXED_ERROR ||
xy.greenx == PNG_FIXED_ERROR ||
xy.greeny == PNG_FIXED_ERROR ||
xy.bluex == PNG_FIXED_ERROR ||
xy.bluey == PNG_FIXED_ERROR)
{
png_chunk_benign_error(png_ptr, "invalid values");
return;
}
if ((png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) != 0)
return;
if ((png_ptr->colorspace.flags & PNG_COLORSPACE_FROM_cHRM) != 0)
{
png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID;
png_colorspace_sync(png_ptr, info_ptr);
png_chunk_benign_error(png_ptr, "duplicate");
return;
}
png_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
(void)png_colorspace_set_chromaticities(png_ptr, &png_ptr->colorspace, &xy,
1);
png_colorspace_sync(png_ptr, info_ptr);
}
#endif
#ifdef PNG_READ_sRGB_SUPPORTED
void
png_handle_sRGB(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_byte intent;
png_debug(1, "in png_handle_sRGB");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if ((png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of place");
return;
}
if (length != 1)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "invalid");
return;
}
png_crc_read(png_ptr, &intent, 1);
if (png_crc_finish(png_ptr, 0) != 0)
return;
if ((png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) != 0)
return;
if ((png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_INTENT) != 0)
{
png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID;
png_colorspace_sync(png_ptr, info_ptr);
png_chunk_benign_error(png_ptr, "too many profiles");
return;
}
(void)png_colorspace_set_sRGB(png_ptr, &png_ptr->colorspace, intent);
png_colorspace_sync(png_ptr, info_ptr);
}
#endif
#ifdef PNG_READ_iCCP_SUPPORTED
void
png_handle_iCCP(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_const_charp errmsg = NULL;
int finished = 0;
png_debug(1, "in png_handle_iCCP");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if ((png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of place");
return;
}
if (length < 9)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "too short");
return;
}
if ((png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) != 0)
{
png_crc_finish(png_ptr, length);
return;
}
if ((png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_INTENT) == 0)
{
uInt read_length, keyword_length;
char keyword[81];
read_length = 81;
if (read_length > length)
read_length = (uInt)length;
png_crc_read(png_ptr, (png_bytep)keyword, read_length);
length -= read_length;
keyword_length = 0;
while (keyword_length < 80 && keyword_length < read_length &&
keyword[keyword_length] != 0)
++keyword_length;
if (keyword_length >= 1 && keyword_length <= 79)
{
if (keyword_length+1 < read_length &&
keyword[keyword_length+1] == PNG_COMPRESSION_TYPE_BASE)
{
read_length -= keyword_length+2;
if (png_inflate_claim(png_ptr, png_iCCP) == Z_OK)
{
Byte profile_header[132];
Byte local_buffer[PNG_INFLATE_BUF_SIZE];
png_alloc_size_t size = (sizeof profile_header);
png_ptr->zstream.next_in = (Bytef*)keyword + (keyword_length+2);
png_ptr->zstream.avail_in = read_length;
(void)png_inflate_read(png_ptr, local_buffer,
(sizeof local_buffer), &length, profile_header, &size,
0);
if (size == 0)
{
const png_uint_32 profile_length =
png_get_uint_32(profile_header);
if (png_icc_check_length(png_ptr, &png_ptr->colorspace,
keyword, profile_length) != 0)
{
if (png_icc_check_header(png_ptr, &png_ptr->colorspace,
keyword, profile_length, profile_header,
png_ptr->color_type) != 0)
{
const png_uint_32 tag_count = png_get_uint_32(
profile_header+128);
png_bytep profile = png_read_buffer(png_ptr,
profile_length, 2);
if (profile != NULL)
{
memcpy(profile, profile_header,
(sizeof profile_header));
size = 12 * tag_count;
(void)png_inflate_read(png_ptr, local_buffer,
(sizeof local_buffer), &length,
profile + (sizeof profile_header), &size, 0);
if (size == 0)
{
if (png_icc_check_tag_table(png_ptr,
&png_ptr->colorspace, keyword, profile_length,
profile) != 0)
{
size = profile_length - (sizeof profile_header)
- 12 * tag_count;
(void)png_inflate_read(png_ptr, local_buffer,
(sizeof local_buffer), &length,
profile + (sizeof profile_header) +
12 * tag_count, &size, 1);
if (length > 0 && !(png_ptr->flags &
PNG_FLAG_BENIGN_ERRORS_WARN))
errmsg = "extra compressed data";
else if (size == 0)
{
if (length > 0)
{
png_chunk_warning(png_ptr,
"extra compressed data");
}
png_crc_finish(png_ptr, length);
finished = 1;
# ifdef PNG_sRGB_SUPPORTED
png_icc_set_sRGB(png_ptr,
&png_ptr->colorspace, profile,
png_ptr->zstream.adler);
# endif
if (info_ptr != NULL)
{
png_free_data(png_ptr, info_ptr,
PNG_FREE_ICCP, 0);
info_ptr->iccp_name = png_voidcast(char*,
png_malloc_base(png_ptr,
keyword_length+1));
if (info_ptr->iccp_name != NULL)
{
memcpy(info_ptr->iccp_name, keyword,
keyword_length+1);
info_ptr->iccp_proflen =
profile_length;
info_ptr->iccp_profile = profile;
png_ptr->read_buffer = NULL;
info_ptr->free_me |= PNG_FREE_ICCP;
info_ptr->valid |= PNG_INFO_iCCP;
}
else
{
png_ptr->colorspace.flags |=
PNG_COLORSPACE_INVALID;
errmsg = "out of memory";
}
}
if (info_ptr != NULL)
png_colorspace_sync(png_ptr, info_ptr);
if (errmsg == NULL)
{
png_ptr->zowner = 0;
return;
}
}
else if (size > 0)
errmsg = "truncated";
#ifndef __COVERITY__
else
errmsg = png_ptr->zstream.msg;
#endif
}
}
else
errmsg = png_ptr->zstream.msg;
}
else
errmsg = "out of memory";
}
}
}
else
errmsg = png_ptr->zstream.msg;
png_ptr->zowner = 0;
}
else
errmsg = png_ptr->zstream.msg;
}
else
errmsg = "bad compression method";
}
else
errmsg = "bad keyword";
}
else
errmsg = "too many profiles";
if (finished == 0)
png_crc_finish(png_ptr, length);
png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID;
png_colorspace_sync(png_ptr, info_ptr);
if (errmsg != NULL)
png_chunk_benign_error(png_ptr, errmsg);
}
#endif
#ifdef PNG_READ_sPLT_SUPPORTED
void
png_handle_sPLT(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_bytep entry_start, buffer;
png_sPLT_t new_palette;
png_sPLT_entryp pp;
png_uint_32 data_length;
int entry_size, i;
png_uint_32 skip = 0;
png_uint_32 dl;
png_size_t max_dl;
png_debug(1, "in png_handle_sPLT");
#ifdef PNG_USER_LIMITS_SUPPORTED
if (png_ptr->user_chunk_cache_max != 0)
{
if (png_ptr->user_chunk_cache_max == 1)
{
png_crc_finish(png_ptr, length);
return;
}
if (--png_ptr->user_chunk_cache_max == 1)
{
png_warning(png_ptr, "No space in chunk cache for sPLT");
png_crc_finish(png_ptr, length);
return;
}
}
#endif
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of place");
return;
}
#ifdef PNG_MAX_MALLOC_64K
if (length > 65535U)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "too large to fit in memory");
return;
}
#endif
buffer = png_read_buffer(png_ptr, length+1, 2);
if (buffer == NULL)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of memory");
return;
}
png_crc_read(png_ptr, buffer, length);
if (png_crc_finish(png_ptr, skip) != 0)
return;
buffer[length] = 0;
for (entry_start = buffer; *entry_start; entry_start++)
;
++entry_start;
if (length < 2U || entry_start > buffer + (length - 2U))
{
png_warning(png_ptr, "malformed sPLT chunk");
return;
}
new_palette.depth = *entry_start++;
entry_size = (new_palette.depth == 8 ? 6 : 10);
data_length = length - (png_uint_32)(entry_start - buffer);
if ((data_length % entry_size) != 0)
{
png_warning(png_ptr, "sPLT chunk has bad length");
return;
}
dl = (png_int_32)(data_length / entry_size);
max_dl = PNG_SIZE_MAX / (sizeof (png_sPLT_entry));
if (dl > max_dl)
{
png_warning(png_ptr, "sPLT chunk too long");
return;
}
new_palette.nentries = (png_int_32)(data_length / entry_size);
new_palette.entries = (png_sPLT_entryp)png_malloc_warn(
png_ptr, new_palette.nentries * (sizeof (png_sPLT_entry)));
if (new_palette.entries == NULL)
{
png_warning(png_ptr, "sPLT chunk requires too much memory");
return;
}
#ifdef PNG_POINTER_INDEXING_SUPPORTED
for (i = 0; i < new_palette.nentries; i++)
{
pp = new_palette.entries + i;
if (new_palette.depth == 8)
{
pp->red = *entry_start++;
pp->green = *entry_start++;
pp->blue = *entry_start++;
pp->alpha = *entry_start++;
}
else
{
pp->red = png_get_uint_16(entry_start); entry_start += 2;
pp->green = png_get_uint_16(entry_start); entry_start += 2;
pp->blue = png_get_uint_16(entry_start); entry_start += 2;
pp->alpha = png_get_uint_16(entry_start); entry_start += 2;
}
pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
}
#else
pp = new_palette.entries;
for (i = 0; i < new_palette.nentries; i++)
{
if (new_palette.depth == 8)
{
pp[i].red = *entry_start++;
pp[i].green = *entry_start++;
pp[i].blue = *entry_start++;
pp[i].alpha = *entry_start++;
}
else
{
pp[i].red = png_get_uint_16(entry_start); entry_start += 2;
pp[i].green = png_get_uint_16(entry_start); entry_start += 2;
pp[i].blue = png_get_uint_16(entry_start); entry_start += 2;
pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2;
}
pp[i].frequency = png_get_uint_16(entry_start); entry_start += 2;
}
#endif
new_palette.name = (png_charp)buffer;
png_set_sPLT(png_ptr, info_ptr, &new_palette, 1);
png_free(png_ptr, new_palette.entries);
}
#endif
#ifdef PNG_READ_tRNS_SUPPORTED
void
png_handle_tRNS(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_byte readbuf[PNG_MAX_PALETTE_LENGTH];
png_debug(1, "in png_handle_tRNS");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of place");
return;
}
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "duplicate");
return;
}
if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
{
png_byte buf[2];
if (length != 2)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "invalid");
return;
}
png_crc_read(png_ptr, buf, 2);
png_ptr->num_trans = 1;
png_ptr->trans_color.gray = png_get_uint_16(buf);
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
{
png_byte buf[6];
if (length != 6)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "invalid");
return;
}
png_crc_read(png_ptr, buf, length);
png_ptr->num_trans = 1;
png_ptr->trans_color.red = png_get_uint_16(buf);
png_ptr->trans_color.green = png_get_uint_16(buf + 2);
png_ptr->trans_color.blue = png_get_uint_16(buf + 4);
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
if ((png_ptr->mode & PNG_HAVE_PLTE) == 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of place");
return;
}
if (length > (unsigned int) png_ptr->num_palette ||
length > (unsigned int) PNG_MAX_PALETTE_LENGTH ||
length == 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "invalid");
return;
}
png_crc_read(png_ptr, readbuf, length);
png_ptr->num_trans = (png_uint_16)length;
}
else
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "invalid with alpha channel");
return;
}
if (png_crc_finish(png_ptr, 0) != 0)
{
png_ptr->num_trans = 0;
return;
}
png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans,
&(png_ptr->trans_color));
}
#endif
#ifdef PNG_READ_bKGD_SUPPORTED
void
png_handle_bKGD(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
unsigned int truelen;
png_byte buf[6];
png_color_16 background;
png_debug(1, "in png_handle_bKGD");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0 ||
(png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
(png_ptr->mode & PNG_HAVE_PLTE) == 0))
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of place");
return;
}
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "duplicate");
return;
}
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
truelen = 1;
else if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
truelen = 6;
else
truelen = 2;
if (length != truelen)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "invalid");
return;
}
png_crc_read(png_ptr, buf, truelen);
if (png_crc_finish(png_ptr, 0) != 0)
return;
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
background.index = buf[0];
if (info_ptr != NULL && info_ptr->num_palette != 0)
{
if (buf[0] >= info_ptr->num_palette)
{
png_chunk_benign_error(png_ptr, "invalid index");
return;
}
background.red = (png_uint_16)png_ptr->palette[buf[0]].red;
background.green = (png_uint_16)png_ptr->palette[buf[0]].green;
background.blue = (png_uint_16)png_ptr->palette[buf[0]].blue;
}
else
background.red = background.green = background.blue = 0;
background.gray = 0;
}
else if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) == 0)
{
background.index = 0;
background.red =
background.green =
background.blue =
background.gray = png_get_uint_16(buf);
}
else
{
background.index = 0;
background.red = png_get_uint_16(buf);
background.green = png_get_uint_16(buf + 2);
background.blue = png_get_uint_16(buf + 4);
background.gray = 0;
}
png_set_bKGD(png_ptr, info_ptr, &background);
}
#endif
#ifdef PNG_READ_hIST_SUPPORTED
void
png_handle_hIST(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
unsigned int num, i;
png_uint_16 readbuf[PNG_MAX_PALETTE_LENGTH];
png_debug(1, "in png_handle_hIST");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0 ||
(png_ptr->mode & PNG_HAVE_PLTE) == 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of place");
return;
}
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "duplicate");
return;
}
num = length / 2 ;
if (num != (unsigned int) png_ptr->num_palette ||
num > (unsigned int) PNG_MAX_PALETTE_LENGTH)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "invalid");
return;
}
for (i = 0; i < num; i++)
{
png_byte buf[2];
png_crc_read(png_ptr, buf, 2);
readbuf[i] = png_get_uint_16(buf);
}
if (png_crc_finish(png_ptr, 0) != 0)
return;
png_set_hIST(png_ptr, info_ptr, readbuf);
}
#endif
#ifdef PNG_READ_pHYs_SUPPORTED
void
png_handle_pHYs(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_byte buf[9];
png_uint_32 res_x, res_y;
int unit_type;
png_debug(1, "in png_handle_pHYs");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of place");
return;
}
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "duplicate");
return;
}
if (length != 9)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "invalid");
return;
}
png_crc_read(png_ptr, buf, 9);
if (png_crc_finish(png_ptr, 0) != 0)
return;
res_x = png_get_uint_32(buf);
res_y = png_get_uint_32(buf + 4);
unit_type = buf[8];
png_set_pHYs(png_ptr, info_ptr, res_x, res_y, unit_type);
}
#endif
#ifdef PNG_READ_oFFs_SUPPORTED
void
png_handle_oFFs(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_byte buf[9];
png_int_32 offset_x, offset_y;
int unit_type;
png_debug(1, "in png_handle_oFFs");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of place");
return;
}
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "duplicate");
return;
}
if (length != 9)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "invalid");
return;
}
png_crc_read(png_ptr, buf, 9);
if (png_crc_finish(png_ptr, 0) != 0)
return;
offset_x = png_get_int_32(buf);
offset_y = png_get_int_32(buf + 4);
unit_type = buf[8];
png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y, unit_type);
}
#endif
#ifdef PNG_READ_pCAL_SUPPORTED
void
png_handle_pCAL(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_int_32 X0, X1;
png_byte type, nparams;
png_bytep buffer, buf, units, endptr;
png_charpp params;
int i;
png_debug(1, "in png_handle_pCAL");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of place");
return;
}
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "duplicate");
return;
}
png_debug1(2, "Allocating and reading pCAL chunk data (%u bytes)",
length + 1);
buffer = png_read_buffer(png_ptr, length+1, 2);
if (buffer == NULL)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of memory");
return;
}
png_crc_read(png_ptr, buffer, length);
if (png_crc_finish(png_ptr, 0) != 0)
return;
buffer[length] = 0;
png_debug(3, "Finding end of pCAL purpose string");
for (buf = buffer; *buf; buf++)
;
endptr = buffer + length;
if (endptr - buf <= 12)
{
png_chunk_benign_error(png_ptr, "invalid");
return;
}
png_debug(3, "Reading pCAL X0, X1, type, nparams, and units");
X0 = png_get_int_32((png_bytep)buf+1);
X1 = png_get_int_32((png_bytep)buf+5);
type = buf[9];
nparams = buf[10];
units = buf + 11;
png_debug(3, "Checking pCAL equation type and number of parameters");
if ((type == PNG_EQUATION_LINEAR && nparams != 2) ||
(type == PNG_EQUATION_BASE_E && nparams != 3) ||
(type == PNG_EQUATION_ARBITRARY && nparams != 3) ||
(type == PNG_EQUATION_HYPERBOLIC && nparams != 4))
{
png_chunk_benign_error(png_ptr, "invalid parameter count");
return;
}
else if (type >= PNG_EQUATION_LAST)
{
png_chunk_benign_error(png_ptr, "unrecognized equation type");
}
for (buf = units; *buf; buf++)
;
png_debug(3, "Allocating pCAL parameters array");
params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
nparams * (sizeof (png_charp))));
if (params == NULL)
{
png_chunk_benign_error(png_ptr, "out of memory");
return;
}
for (i = 0; i < nparams; i++)
{
buf++;
png_debug1(3, "Reading pCAL parameter %d", i);
for (params[i] = (png_charp)buf; buf <= endptr && *buf != 0; buf++)
;
if (buf > endptr)
{
png_free(png_ptr, params);
png_chunk_benign_error(png_ptr, "invalid data");
return;
}
}
png_set_pCAL(png_ptr, info_ptr, (png_charp)buffer, X0, X1, type, nparams,
(png_charp)units, params);
png_free(png_ptr, params);
}
#endif
#ifdef PNG_READ_sCAL_SUPPORTED
void
png_handle_sCAL(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_bytep buffer;
png_size_t i;
int state;
png_debug(1, "in png_handle_sCAL");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of place");
return;
}
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "duplicate");
return;
}
else if (length < 4)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "invalid");
return;
}
png_debug1(2, "Allocating and reading sCAL chunk data (%u bytes)",
length + 1);
buffer = png_read_buffer(png_ptr, length+1, 2);
if (buffer == NULL)
{
png_chunk_benign_error(png_ptr, "out of memory");
png_crc_finish(png_ptr, length);
return;
}
png_crc_read(png_ptr, buffer, length);
buffer[length] = 0;
if (png_crc_finish(png_ptr, 0) != 0)
return;
if (buffer[0] != 1 && buffer[0] != 2)
{
png_chunk_benign_error(png_ptr, "invalid unit");
return;
}
i = 1;
state = 0;
if (png_check_fp_number((png_const_charp)buffer, length, &state, &i) == 0 ||
i >= length || buffer[i++] != 0)
png_chunk_benign_error(png_ptr, "bad width format");
else if (PNG_FP_IS_POSITIVE(state) == 0)
png_chunk_benign_error(png_ptr, "non-positive width");
else
{
png_size_t heighti = i;
state = 0;
if (png_check_fp_number((png_const_charp)buffer, length,
&state, &i) == 0 || i != length)
png_chunk_benign_error(png_ptr, "bad height format");
else if (PNG_FP_IS_POSITIVE(state) == 0)
png_chunk_benign_error(png_ptr, "non-positive height");
else
png_set_sCAL_s(png_ptr, info_ptr, buffer[0],
(png_charp)buffer+1, (png_charp)buffer+heighti);
}
}
#endif
#ifdef PNG_READ_tIME_SUPPORTED
void
png_handle_tIME(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_byte buf[7];
png_time mod_time;
png_debug(1, "in png_handle_tIME");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "duplicate");
return;
}
if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
png_ptr->mode |= PNG_AFTER_IDAT;
if (length != 7)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "invalid");
return;
}
png_crc_read(png_ptr, buf, 7);
if (png_crc_finish(png_ptr, 0) != 0)
return;
mod_time.second = buf[6];
mod_time.minute = buf[5];
mod_time.hour = buf[4];
mod_time.day = buf[3];
mod_time.month = buf[2];
mod_time.year = png_get_uint_16(buf);
png_set_tIME(png_ptr, info_ptr, &mod_time);
}
#endif
#ifdef PNG_READ_tEXt_SUPPORTED
void
png_handle_tEXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_text text_info;
png_bytep buffer;
png_charp key;
png_charp text;
png_uint_32 skip = 0;
png_debug(1, "in png_handle_tEXt");
#ifdef PNG_USER_LIMITS_SUPPORTED
if (png_ptr->user_chunk_cache_max != 0)
{
if (png_ptr->user_chunk_cache_max == 1)
{
png_crc_finish(png_ptr, length);
return;
}
if (--png_ptr->user_chunk_cache_max == 1)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "no space in chunk cache");
return;
}
}
#endif
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
png_ptr->mode |= PNG_AFTER_IDAT;
#ifdef PNG_MAX_MALLOC_64K
if (length > 65535U)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "too large to fit in memory");
return;
}
#endif
buffer = png_read_buffer(png_ptr, length+1, 1);
if (buffer == NULL)
{
png_chunk_benign_error(png_ptr, "out of memory");
return;
}
png_crc_read(png_ptr, buffer, length);
if (png_crc_finish(png_ptr, skip) != 0)
return;
key = (png_charp)buffer;
key[length] = 0;
for (text = key; *text; text++)
;
if (text != key + length)
text++;
text_info.compression = PNG_TEXT_COMPRESSION_NONE;
text_info.key = key;
text_info.lang = NULL;
text_info.lang_key = NULL;
text_info.itxt_length = 0;
text_info.text = text;
text_info.text_length = strlen(text);
if (png_set_text_2(png_ptr, info_ptr, &text_info, 1) != 0)
png_warning(png_ptr, "Insufficient memory to process text chunk");
}
#endif
#ifdef PNG_READ_zTXt_SUPPORTED
void
png_handle_zTXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_const_charp errmsg = NULL;
png_bytep buffer;
png_uint_32 keyword_length;
png_debug(1, "in png_handle_zTXt");
#ifdef PNG_USER_LIMITS_SUPPORTED
if (png_ptr->user_chunk_cache_max != 0)
{
if (png_ptr->user_chunk_cache_max == 1)
{
png_crc_finish(png_ptr, length);
return;
}
if (--png_ptr->user_chunk_cache_max == 1)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "no space in chunk cache");
return;
}
}
#endif
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
png_ptr->mode |= PNG_AFTER_IDAT;
buffer = png_read_buffer(png_ptr, length, 2);
if (buffer == NULL)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of memory");
return;
}
png_crc_read(png_ptr, buffer, length);
if (png_crc_finish(png_ptr, 0) != 0)
return;
for (keyword_length = 0;
keyword_length < length && buffer[keyword_length] != 0;
++keyword_length)
;
if (keyword_length > 79 || keyword_length < 1)
errmsg = "bad keyword";
else if (keyword_length + 3 > length)
errmsg = "truncated";
else if (buffer[keyword_length+1] != PNG_COMPRESSION_TYPE_BASE)
errmsg = "unknown compression type";
else
{
png_alloc_size_t uncompressed_length = PNG_SIZE_MAX;
if (png_decompress_chunk(png_ptr, length, keyword_length+2,
&uncompressed_length, 1) == Z_STREAM_END)
{
png_text text;
buffer = png_ptr->read_buffer;
buffer[uncompressed_length+(keyword_length+2)] = 0;
text.compression = PNG_TEXT_COMPRESSION_zTXt;
text.key = (png_charp)buffer;
text.text = (png_charp)(buffer + keyword_length+2);
text.text_length = uncompressed_length;
text.itxt_length = 0;
text.lang = NULL;
text.lang_key = NULL;
if (png_set_text_2(png_ptr, info_ptr, &text, 1) != 0)
errmsg = "insufficient memory";
}
else
errmsg = png_ptr->zstream.msg;
}
if (errmsg != NULL)
png_chunk_benign_error(png_ptr, errmsg);
}
#endif
#ifdef PNG_READ_iTXt_SUPPORTED
void
png_handle_iTXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_const_charp errmsg = NULL;
png_bytep buffer;
png_uint_32 prefix_length;
png_debug(1, "in png_handle_iTXt");
#ifdef PNG_USER_LIMITS_SUPPORTED
if (png_ptr->user_chunk_cache_max != 0)
{
if (png_ptr->user_chunk_cache_max == 1)
{
png_crc_finish(png_ptr, length);
return;
}
if (--png_ptr->user_chunk_cache_max == 1)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "no space in chunk cache");
return;
}
}
#endif
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
png_ptr->mode |= PNG_AFTER_IDAT;
buffer = png_read_buffer(png_ptr, length+1, 1);
if (buffer == NULL)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "out of memory");
return;
}
png_crc_read(png_ptr, buffer, length);
if (png_crc_finish(png_ptr, 0) != 0)
return;
for (prefix_length=0;
prefix_length < length && buffer[prefix_length] != 0;
++prefix_length)
;
if (prefix_length > 79 || prefix_length < 1)
errmsg = "bad keyword";
else if (prefix_length + 5 > length)
errmsg = "truncated";
else if (buffer[prefix_length+1] == 0 ||
(buffer[prefix_length+1] == 1 &&
buffer[prefix_length+2] == PNG_COMPRESSION_TYPE_BASE))
{
int compressed = buffer[prefix_length+1] != 0;
png_uint_32 language_offset, translated_keyword_offset;
png_alloc_size_t uncompressed_length = 0;
prefix_length += 3;
language_offset = prefix_length;
for (; prefix_length < length && buffer[prefix_length] != 0;
++prefix_length)
;
translated_keyword_offset = ++prefix_length;
for (; prefix_length < length && buffer[prefix_length] != 0;
++prefix_length)
;
++prefix_length;
if (compressed == 0 && prefix_length <= length)
uncompressed_length = length - prefix_length;
else if (compressed != 0 && prefix_length < length)
{
uncompressed_length = PNG_SIZE_MAX;
if (png_decompress_chunk(png_ptr, length, prefix_length,
&uncompressed_length, 1) == Z_STREAM_END)
buffer = png_ptr->read_buffer;
else
errmsg = png_ptr->zstream.msg;
}
else
errmsg = "truncated";
if (errmsg == NULL)
{
png_text text;
buffer[uncompressed_length+prefix_length] = 0;
if (compressed == 0)
text.compression = PNG_ITXT_COMPRESSION_NONE;
else
text.compression = PNG_ITXT_COMPRESSION_zTXt;
text.key = (png_charp)buffer;
text.lang = (png_charp)buffer + language_offset;
text.lang_key = (png_charp)buffer + translated_keyword_offset;
text.text = (png_charp)buffer + prefix_length;
text.text_length = 0;
text.itxt_length = uncompressed_length;
if (png_set_text_2(png_ptr, info_ptr, &text, 1) != 0)
errmsg = "insufficient memory";
}
}
else
errmsg = "bad compression info";
if (errmsg != NULL)
png_chunk_benign_error(png_ptr, errmsg);
}
#endif
#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
static int
png_cache_unknown_chunk(png_structrp png_ptr, png_uint_32 length)
{
png_alloc_size_t limit = PNG_SIZE_MAX;
if (png_ptr->unknown_chunk.data != NULL)
{
png_free(png_ptr, png_ptr->unknown_chunk.data);
png_ptr->unknown_chunk.data = NULL;
}
# ifdef PNG_SET_USER_LIMITS_SUPPORTED
if (png_ptr->user_chunk_malloc_max > 0 &&
png_ptr->user_chunk_malloc_max < limit)
limit = png_ptr->user_chunk_malloc_max;
# elif PNG_USER_CHUNK_MALLOC_MAX > 0
if (PNG_USER_CHUNK_MALLOC_MAX < limit)
limit = PNG_USER_CHUNK_MALLOC_MAX;
# endif
if (length <= limit)
{
PNG_CSTRING_FROM_CHUNK(png_ptr->unknown_chunk.name, png_ptr->chunk_name);
png_ptr->unknown_chunk.size = (png_size_t)length;
png_ptr->unknown_chunk.location = (png_byte)png_ptr->mode;
if (length == 0)
png_ptr->unknown_chunk.data = NULL;
else
{
png_ptr->unknown_chunk.data = png_voidcast(png_bytep,
png_malloc_warn(png_ptr, length));
}
}
if (png_ptr->unknown_chunk.data == NULL && length > 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "unknown chunk exceeds memory limits");
return 0;
}
else
{
if (length > 0)
png_crc_read(png_ptr, png_ptr->unknown_chunk.data, length);
png_crc_finish(png_ptr, 0);
return 1;
}
}
#endif
void
png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr,
png_uint_32 length, int keep)
{
int handled = 0;
png_debug(1, "in png_handle_unknown");
#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
# ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
# ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
keep = png_chunk_unknown_handling(png_ptr, png_ptr->chunk_name);
# endif
# endif
# ifdef PNG_READ_USER_CHUNKS_SUPPORTED
if (png_ptr->read_user_chunk_fn != NULL)
{
if (png_cache_unknown_chunk(png_ptr, length) != 0)
{
int ret = (*(png_ptr->read_user_chunk_fn))(png_ptr,
&png_ptr->unknown_chunk);
if (ret < 0)
png_chunk_error(png_ptr, "error in user chunk");
else if (ret == 0)
{
if (keep < PNG_HANDLE_CHUNK_IF_SAFE)
{
# ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
if (png_ptr->unknown_default < PNG_HANDLE_CHUNK_IF_SAFE)
{
png_chunk_warning(png_ptr, "Saving unknown chunk:");
png_app_warning(png_ptr,
"forcing save of an unhandled chunk;"
" please call png_set_keep_unknown_chunks");
}
# endif
keep = PNG_HANDLE_CHUNK_IF_SAFE;
}
}
else
{
handled = 1;
keep = PNG_HANDLE_CHUNK_NEVER;
}
}
else
keep = PNG_HANDLE_CHUNK_NEVER;
}
else
# endif
# ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
{
if (keep == PNG_HANDLE_CHUNK_AS_DEFAULT)
keep = png_ptr->unknown_default;
if (keep == PNG_HANDLE_CHUNK_ALWAYS ||
(keep == PNG_HANDLE_CHUNK_IF_SAFE &&
PNG_CHUNK_ANCILLARY(png_ptr->chunk_name)))
{
if (png_cache_unknown_chunk(png_ptr, length) == 0)
keep = PNG_HANDLE_CHUNK_NEVER;
}
else
png_crc_finish(png_ptr, length);
}
# else
# ifndef PNG_READ_USER_CHUNKS_SUPPORTED
# error no method to support READ_UNKNOWN_CHUNKS
# endif
{
if (keep > PNG_HANDLE_CHUNK_NEVER)
png_app_error(png_ptr, "no unknown chunk support available");
png_crc_finish(png_ptr, length);
}
# endif
# ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
if (keep == PNG_HANDLE_CHUNK_ALWAYS ||
(keep == PNG_HANDLE_CHUNK_IF_SAFE &&
PNG_CHUNK_ANCILLARY(png_ptr->chunk_name)))
{
# ifdef PNG_USER_LIMITS_SUPPORTED
switch (png_ptr->user_chunk_cache_max)
{
case 2:
png_ptr->user_chunk_cache_max = 1;
png_chunk_benign_error(png_ptr, "no space in chunk cache");
case 1:
break;
default:
--(png_ptr->user_chunk_cache_max);
case 0:
# endif
png_set_unknown_chunks(png_ptr, info_ptr,
&png_ptr->unknown_chunk, 1);
handled = 1;
# ifdef PNG_USER_LIMITS_SUPPORTED
break;
}
# endif
}
# else
PNG_UNUSED(info_ptr)
# endif
if (png_ptr->unknown_chunk.data != NULL)
png_free(png_ptr, png_ptr->unknown_chunk.data);
png_ptr->unknown_chunk.data = NULL;
#else
png_crc_finish(png_ptr, length);
PNG_UNUSED(info_ptr)
PNG_UNUSED(keep)
#endif
if (handled == 0 && PNG_CHUNK_CRITICAL(png_ptr->chunk_name))
png_chunk_error(png_ptr, "unhandled critical chunk");
}
void
png_check_chunk_name(png_structrp png_ptr, png_uint_32 chunk_name)
{
int i;
png_debug(1, "in png_check_chunk_name");
for (i=1; i<=4; ++i)
{
int c = chunk_name & 0xff;
if (c < 65 || c > 122 || (c > 90 && c < 97))
png_chunk_error(png_ptr, "invalid chunk type");
chunk_name >>= 8;
}
}
void
png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display)
{
unsigned int pixel_depth = png_ptr->transformed_pixel_depth;
png_const_bytep sp = png_ptr->row_buf + 1;
png_alloc_size_t row_width = png_ptr->width;
unsigned int pass = png_ptr->pass;
png_bytep end_ptr = 0;
png_byte end_byte = 0;
unsigned int end_mask;
png_debug(1, "in png_combine_row");
if (pixel_depth == 0)
png_error(png_ptr, "internal row logic error");
if (png_ptr->info_rowbytes != 0 && png_ptr->info_rowbytes !=
PNG_ROWBYTES(pixel_depth, row_width))
png_error(png_ptr, "internal row size calculation error");
if (row_width == 0)
png_error(png_ptr, "internal row width error");
end_mask = (pixel_depth * row_width) & 7;
if (end_mask != 0)
{
end_ptr = dp + PNG_ROWBYTES(pixel_depth, row_width) - 1;
end_byte = *end_ptr;
# ifdef PNG_READ_PACKSWAP_SUPPORTED
if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
end_mask = 0xff << end_mask;
else
# endif
end_mask = 0xff >> end_mask;
}
#ifdef PNG_READ_INTERLACING_SUPPORTED
if (png_ptr->interlaced != 0 &&
(png_ptr->transformations & PNG_INTERLACE) != 0 &&
pass < 6 && (display == 0 ||
(display == 1 && (pass & 1) != 0)))
{
if (row_width <= PNG_PASS_START_COL(pass))
return;
if (pixel_depth < 8)
{
# if PNG_USE_COMPILE_TIME_MASKS
# define PNG_LSR(x,s) ((x)>>((s) & 0x1f))
# define PNG_LSL(x,s) ((x)<<((s) & 0x1f))
# else
# define PNG_LSR(x,s) ((x)>>(s))
# define PNG_LSL(x,s) ((x)<<(s))
# endif
# define S_COPY(p,x) (((p)<4 ? PNG_LSR(0x80088822,(3-(p))*8+(7-(x))) :\
PNG_LSR(0xaa55ff00,(7-(p))*8+(7-(x)))) & 1)
# define B_COPY(p,x) (((p)<4 ? PNG_LSR(0xff0fff33,(3-(p))*8+(7-(x))) :\
PNG_LSR(0xff55ff00,(7-(p))*8+(7-(x)))) & 1)
# define PIXEL_MASK(p,x,d,s) \
(PNG_LSL(((PNG_LSL(1U,(d)))-1),(((x)*(d))^((s)?8-(d):0))))
# define S_MASKx(p,x,d,s) (S_COPY(p,x)?PIXEL_MASK(p,x,d,s):0)
# define B_MASKx(p,x,d,s) (B_COPY(p,x)?PIXEL_MASK(p,x,d,s):0)
# define MASK_EXPAND(m,d) ((m)*((d)==1?0x01010101:((d)==2?0x00010001:1)))
# define S_MASK(p,d,s) MASK_EXPAND(S_MASKx(p,0,d,s) + S_MASKx(p,1,d,s) +\
S_MASKx(p,2,d,s) + S_MASKx(p,3,d,s) + S_MASKx(p,4,d,s) +\
S_MASKx(p,5,d,s) + S_MASKx(p,6,d,s) + S_MASKx(p,7,d,s), d)
# define B_MASK(p,d,s) MASK_EXPAND(B_MASKx(p,0,d,s) + B_MASKx(p,1,d,s) +\
B_MASKx(p,2,d,s) + B_MASKx(p,3,d,s) + B_MASKx(p,4,d,s) +\
B_MASKx(p,5,d,s) + B_MASKx(p,6,d,s) + B_MASKx(p,7,d,s), d)
#if PNG_USE_COMPILE_TIME_MASKS
# define S_MASKS(d,s) { S_MASK(0,d,s), S_MASK(1,d,s), S_MASK(2,d,s),\
S_MASK(3,d,s), S_MASK(4,d,s), S_MASK(5,d,s) }
# define B_MASKS(d,s) { B_MASK(1,d,s), B_MASK(3,d,s), B_MASK(5,d,s) }
# define DEPTH_INDEX(d) ((d)==1?0:((d)==2?1:2))
static PNG_CONST png_uint_32 row_mask[2][3][6] =
{
{ S_MASKS(1,0), S_MASKS(2,0), S_MASKS(4,0) },
{ S_MASKS(1,1), S_MASKS(2,1), S_MASKS(4,1) }
};
static PNG_CONST png_uint_32 display_mask[2][3][3] =
{
{ B_MASKS(1,0), B_MASKS(2,0), B_MASKS(4,0) },
{ B_MASKS(1,1), B_MASKS(2,1), B_MASKS(4,1) }
};
# define MASK(pass,depth,display,png)\
((display)?display_mask[png][DEPTH_INDEX(depth)][pass>>1]:\
row_mask[png][DEPTH_INDEX(depth)][pass])
#else
# define MASK(pass,depth,display,png)\
((display)?B_MASK(pass,depth,png):S_MASK(pass,depth,png))
#endif
png_uint_32 pixels_per_byte = 8 / pixel_depth;
png_uint_32 mask;
# ifdef PNG_READ_PACKSWAP_SUPPORTED
if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
mask = MASK(pass, pixel_depth, display, 0);
else
# endif
mask = MASK(pass, pixel_depth, display, 1);
for (;;)
{
png_uint_32 m;
m = mask;
mask = (m >> 8) | (m << 24);
m &= 0xff;
if (m != 0)
{
if (m != 0xff)
*dp = (png_byte)((*dp & ~m) | (*sp & m));
else
*dp = *sp;
}
if (row_width <= pixels_per_byte)
break;
row_width -= pixels_per_byte;
++dp;
++sp;
}
}
else
{
unsigned int bytes_to_copy, bytes_to_jump;
if (pixel_depth & 7)
png_error(png_ptr, "invalid user transform pixel depth");
pixel_depth >>= 3;
row_width *= pixel_depth;
{
unsigned int offset = PNG_PASS_START_COL(pass) * pixel_depth;
row_width -= offset;
dp += offset;
sp += offset;
}
if (display != 0)
{
bytes_to_copy = (1<<((6-pass)>>1)) * pixel_depth;
if (bytes_to_copy > row_width)
bytes_to_copy = (unsigned int)row_width;
}
else
bytes_to_copy = pixel_depth;
bytes_to_jump = PNG_PASS_COL_OFFSET(pass) * pixel_depth;
switch (bytes_to_copy)
{
case 1:
for (;;)
{
*dp = *sp;
if (row_width <= bytes_to_jump)
return;
dp += bytes_to_jump;
sp += bytes_to_jump;
row_width -= bytes_to_jump;
}
case 2:
do
{
dp[0] = sp[0], dp[1] = sp[1];
if (row_width <= bytes_to_jump)
return;
sp += bytes_to_jump;
dp += bytes_to_jump;
row_width -= bytes_to_jump;
}
while (row_width > 1);
*dp = *sp;
return;
case 3:
for (;;)
{
dp[0] = sp[0], dp[1] = sp[1], dp[2] = sp[2];
if (row_width <= bytes_to_jump)
return;
sp += bytes_to_jump;
dp += bytes_to_jump;
row_width -= bytes_to_jump;
}
default:
#if PNG_ALIGN_TYPE != PNG_ALIGN_NONE
if (bytes_to_copy < 16 &&
png_isaligned(dp, png_uint_16) &&
png_isaligned(sp, png_uint_16) &&
bytes_to_copy % (sizeof (png_uint_16)) == 0 &&
bytes_to_jump % (sizeof (png_uint_16)) == 0)
{
if (png_isaligned(dp, png_uint_32) != 0 &&
png_isaligned(sp, png_uint_32) != 0 &&
bytes_to_copy % (sizeof (png_uint_32)) == 0 &&
bytes_to_jump % (sizeof (png_uint_32)) == 0)
{
png_uint_32p dp32 = png_aligncast(png_uint_32p,dp);
png_const_uint_32p sp32 = png_aligncastconst(
png_const_uint_32p, sp);
size_t skip = (bytes_to_jump-bytes_to_copy) /
(sizeof (png_uint_32));
do
{
size_t c = bytes_to_copy;
do
{
*dp32++ = *sp32++;
c -= (sizeof (png_uint_32));
}
while (c > 0);
if (row_width <= bytes_to_jump)
return;
dp32 += skip;
sp32 += skip;
row_width -= bytes_to_jump;
}
while (bytes_to_copy <= row_width);
dp = (png_bytep)dp32;
sp = (png_const_bytep)sp32;
do
*dp++ = *sp++;
while (--row_width > 0);
return;
}
else
{
png_uint_16p dp16 = png_aligncast(png_uint_16p, dp);
png_const_uint_16p sp16 = png_aligncastconst(
png_const_uint_16p, sp);
size_t skip = (bytes_to_jump-bytes_to_copy) /
(sizeof (png_uint_16));
do
{
size_t c = bytes_to_copy;
do
{
*dp16++ = *sp16++;
c -= (sizeof (png_uint_16));
}
while (c > 0);
if (row_width <= bytes_to_jump)
return;
dp16 += skip;
sp16 += skip;
row_width -= bytes_to_jump;
}
while (bytes_to_copy <= row_width);
dp = (png_bytep)dp16;
sp = (png_const_bytep)sp16;
do
*dp++ = *sp++;
while (--row_width > 0);
return;
}
}
#endif
for (;;)
{
memcpy(dp, sp, bytes_to_copy);
if (row_width <= bytes_to_jump)
return;
sp += bytes_to_jump;
dp += bytes_to_jump;
row_width -= bytes_to_jump;
if (bytes_to_copy > row_width)
bytes_to_copy = (unsigned int)row_width;
}
}
}
}
else
#endif
memcpy(dp, sp, PNG_ROWBYTES(pixel_depth, row_width));
if (end_ptr != NULL)
*end_ptr = (png_byte)((end_byte & end_mask) | (*end_ptr & ~end_mask));
}
#ifdef PNG_READ_INTERLACING_SUPPORTED
void
png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
png_uint_32 transformations )
{
static PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
png_debug(1, "in png_do_read_interlace");
if (row != NULL && row_info != NULL)
{
png_uint_32 final_width;
final_width = row_info->width * png_pass_inc[pass];
switch (row_info->pixel_depth)
{
case 1:
{
png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 3);
png_bytep dp = row + (png_size_t)((final_width - 1) >> 3);
int sshift, dshift;
int s_start, s_end, s_inc;
int jstop = png_pass_inc[pass];
png_byte v;
png_uint_32 i;
int j;
#ifdef PNG_READ_PACKSWAP_SUPPORTED
if ((transformations & PNG_PACKSWAP) != 0)
{
sshift = (int)((row_info->width + 7) & 0x07);
dshift = (int)((final_width + 7) & 0x07);
s_start = 7;
s_end = 0;
s_inc = -1;
}
else
#endif
{
sshift = 7 - (int)((row_info->width + 7) & 0x07);
dshift = 7 - (int)((final_width + 7) & 0x07);
s_start = 0;
s_end = 7;
s_inc = 1;
}
for (i = 0; i < row_info->width; i++)
{
v = (png_byte)((*sp >> sshift) & 0x01);
for (j = 0; j < jstop; j++)
{
unsigned int tmp = *dp & (0x7f7f >> (7 - dshift));
tmp |= v << dshift;
*dp = (png_byte)(tmp & 0xff);
if (dshift == s_end)
{
dshift = s_start;
dp--;
}
else
dshift += s_inc;
}
if (sshift == s_end)
{
sshift = s_start;
sp--;
}
else
sshift += s_inc;
}
break;
}
case 2:
{
png_bytep sp = row + (png_uint_32)((row_info->width - 1) >> 2);
png_bytep dp = row + (png_uint_32)((final_width - 1) >> 2);
int sshift, dshift;
int s_start, s_end, s_inc;
int jstop = png_pass_inc[pass];
png_uint_32 i;
#ifdef PNG_READ_PACKSWAP_SUPPORTED
if ((transformations & PNG_PACKSWAP) != 0)
{
sshift = (int)(((row_info->width + 3) & 0x03) << 1);
dshift = (int)(((final_width + 3) & 0x03) << 1);
s_start = 6;
s_end = 0;
s_inc = -2;
}
else
#endif
{
sshift = (int)((3 - ((row_info->width + 3) & 0x03)) << 1);
dshift = (int)((3 - ((final_width + 3) & 0x03)) << 1);
s_start = 0;
s_end = 6;
s_inc = 2;
}
for (i = 0; i < row_info->width; i++)
{
png_byte v;
int j;
v = (png_byte)((*sp >> sshift) & 0x03);
for (j = 0; j < jstop; j++)
{
unsigned int tmp = *dp & (0x3f3f >> (6 - dshift));
tmp |= v << dshift;
*dp = (png_byte)(tmp & 0xff);
if (dshift == s_end)
{
dshift = s_start;
dp--;
}
else
dshift += s_inc;
}
if (sshift == s_end)
{
sshift = s_start;
sp--;
}
else
sshift += s_inc;
}
break;
}
case 4:
{
png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 1);
png_bytep dp = row + (png_size_t)((final_width - 1) >> 1);
int sshift, dshift;
int s_start, s_end, s_inc;
png_uint_32 i;
int jstop = png_pass_inc[pass];
#ifdef PNG_READ_PACKSWAP_SUPPORTED
if ((transformations & PNG_PACKSWAP) != 0)
{
sshift = (int)(((row_info->width + 1) & 0x01) << 2);
dshift = (int)(((final_width + 1) & 0x01) << 2);
s_start = 4;
s_end = 0;
s_inc = -4;
}
else
#endif
{
sshift = (int)((1 - ((row_info->width + 1) & 0x01)) << 2);
dshift = (int)((1 - ((final_width + 1) & 0x01)) << 2);
s_start = 0;
s_end = 4;
s_inc = 4;
}
for (i = 0; i < row_info->width; i++)
{
png_byte v = (png_byte)((*sp >> sshift) & 0x0f);
int j;
for (j = 0; j < jstop; j++)
{
unsigned int tmp = *dp & (0xf0f >> (4 - dshift));
tmp |= v << dshift;
*dp = (png_byte)(tmp & 0xff);
if (dshift == s_end)
{
dshift = s_start;
dp--;
}
else
dshift += s_inc;
}
if (sshift == s_end)
{
sshift = s_start;
sp--;
}
else
sshift += s_inc;
}
break;
}
default:
{
png_size_t pixel_bytes = (row_info->pixel_depth >> 3);
png_bytep sp = row + (png_size_t)(row_info->width - 1)
* pixel_bytes;
png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes;
int jstop = png_pass_inc[pass];
png_uint_32 i;
for (i = 0; i < row_info->width; i++)
{
png_byte v[8];
int j;
memcpy(v, sp, pixel_bytes);
for (j = 0; j < jstop; j++)
{
memcpy(dp, v, pixel_bytes);
dp -= pixel_bytes;
}
sp -= pixel_bytes;
}
break;
}
}
row_info->width = final_width;
row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, final_width);
}
#ifndef PNG_READ_PACKSWAP_SUPPORTED
PNG_UNUSED(transformations)
#endif
}
#endif
static void
png_read_filter_row_sub(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_size_t i;
png_size_t istop = row_info->rowbytes;
unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
png_bytep rp = row + bpp;
PNG_UNUSED(prev_row)
for (i = bpp; i < istop; i++)
{
*rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff);
rp++;
}
}
static void
png_read_filter_row_up(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_size_t i;
png_size_t istop = row_info->rowbytes;
png_bytep rp = row;
png_const_bytep pp = prev_row;
for (i = 0; i < istop; i++)
{
*rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
rp++;
}
}
static void
png_read_filter_row_avg(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_size_t i;
png_bytep rp = row;
png_const_bytep pp = prev_row;
unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
png_size_t istop = row_info->rowbytes - bpp;
for (i = 0; i < bpp; i++)
{
*rp = (png_byte)(((int)(*rp) +
((int)(*pp++) / 2 )) & 0xff);
rp++;
}
for (i = 0; i < istop; i++)
{
*rp = (png_byte)(((int)(*rp) +
(int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
rp++;
}
}
static void
png_read_filter_row_paeth_1byte_pixel(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_bytep rp_end = row + row_info->rowbytes;
int a, c;
c = *prev_row++;
a = *row + c;
*row++ = (png_byte)a;
while (row < rp_end)
{
int b, pa, pb, pc, p;
a &= 0xff;
b = *prev_row++;
p = b - c;
pc = a - c;
#ifdef PNG_USE_ABS
pa = abs(p);
pb = abs(pc);
pc = abs(p + pc);
#else
pa = p < 0 ? -p : p;
pb = pc < 0 ? -pc : pc;
pc = (p + pc) < 0 ? -(p + pc) : p + pc;
#endif
if (pb < pa) pa = pb, a = b;
if (pc < pa) a = c;
c = b;
a += *row;
*row++ = (png_byte)a;
}
}
static void
png_read_filter_row_paeth_multibyte_pixel(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
int bpp = (row_info->pixel_depth + 7) >> 3;
png_bytep rp_end = row + bpp;
while (row < rp_end)
{
int a = *row + *prev_row++;
*row++ = (png_byte)a;
}
rp_end += row_info->rowbytes - bpp;
while (row < rp_end)
{
int a, b, c, pa, pb, pc, p;
c = *(prev_row - bpp);
a = *(row - bpp);
b = *prev_row++;
p = b - c;
pc = a - c;
#ifdef PNG_USE_ABS
pa = abs(p);
pb = abs(pc);
pc = abs(p + pc);
#else
pa = p < 0 ? -p : p;
pb = pc < 0 ? -pc : pc;
pc = (p + pc) < 0 ? -(p + pc) : p + pc;
#endif
if (pb < pa) pa = pb, a = b;
if (pc < pa) a = c;
a += *row;
*row++ = (png_byte)a;
}
}
static void
png_init_filter_functions(png_structrp pp)
{
unsigned int bpp = (pp->pixel_depth + 7) >> 3;
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub;
pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up;
pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg;
if (bpp == 1)
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
png_read_filter_row_paeth_1byte_pixel;
else
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
png_read_filter_row_paeth_multibyte_pixel;
#ifdef PNG_FILTER_OPTIMIZATIONS
PNG_FILTER_OPTIMIZATIONS(pp, bpp);
#endif
}
void
png_read_filter_row(png_structrp pp, png_row_infop row_info, png_bytep row,
png_const_bytep prev_row, int filter)
{
if (filter > PNG_FILTER_VALUE_NONE && filter < PNG_FILTER_VALUE_LAST)
{
if (pp->read_filter[0] == NULL)
png_init_filter_functions(pp);
pp->read_filter[filter-1](row_info, row, prev_row);
}
}
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
void
png_read_IDAT_data(png_structrp png_ptr, png_bytep output,
png_alloc_size_t avail_out)
{
png_ptr->zstream.next_out = output;
png_ptr->zstream.avail_out = 0;
if (output == NULL)
avail_out = 0;
do
{
int ret;
png_byte tmpbuf[PNG_INFLATE_BUF_SIZE];
if (png_ptr->zstream.avail_in == 0)
{
uInt avail_in;
png_bytep buffer;
while (png_ptr->idat_size == 0)
{
png_crc_finish(png_ptr, 0);
png_ptr->idat_size = png_read_chunk_header(png_ptr);
if (png_ptr->chunk_name != png_IDAT)
png_error(png_ptr, "Not enough image data");
}
avail_in = png_ptr->IDAT_read_size;
if (avail_in > png_ptr->idat_size)
avail_in = (uInt)png_ptr->idat_size;
buffer = png_read_buffer(png_ptr, avail_in, 0);
png_crc_read(png_ptr, buffer, avail_in);
png_ptr->idat_size -= avail_in;
png_ptr->zstream.next_in = buffer;
png_ptr->zstream.avail_in = avail_in;
}
if (output != NULL)
{
uInt out = ZLIB_IO_MAX;
if (out > avail_out)
out = (uInt)avail_out;
avail_out -= out;
png_ptr->zstream.avail_out = out;
}
else
{
png_ptr->zstream.next_out = tmpbuf;
png_ptr->zstream.avail_out = (sizeof tmpbuf);
}
ret = PNG_INFLATE(png_ptr, Z_NO_FLUSH);
if (output != NULL)
avail_out += png_ptr->zstream.avail_out;
else
avail_out += (sizeof tmpbuf) - png_ptr->zstream.avail_out;
png_ptr->zstream.avail_out = 0;
if (ret == Z_STREAM_END)
{
png_ptr->zstream.next_out = NULL;
png_ptr->mode |= PNG_AFTER_IDAT;
png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED;
if (png_ptr->zstream.avail_in > 0 || png_ptr->idat_size > 0)
png_chunk_benign_error(png_ptr, "Extra compressed data");
break;
}
if (ret != Z_OK)
{
png_zstream_error(png_ptr, ret);
if (output != NULL)
png_chunk_error(png_ptr, png_ptr->zstream.msg);
else
{
png_chunk_benign_error(png_ptr, png_ptr->zstream.msg);
return;
}
}
} while (avail_out > 0);
if (avail_out > 0)
{
if (output != NULL)
png_error(png_ptr, "Not enough image data");
else
png_chunk_benign_error(png_ptr, "Too much image data");
}
}
void
png_read_finish_IDAT(png_structrp png_ptr)
{
if ((png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED) == 0)
{
png_read_IDAT_data(png_ptr, NULL, 0);
png_ptr->zstream.next_out = NULL;
if ((png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED) == 0)
{
png_ptr->mode |= PNG_AFTER_IDAT;
png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED;
}
}
if (png_ptr->zowner == png_IDAT)
{
png_ptr->zstream.next_in = NULL;
png_ptr->zstream.avail_in = 0;
png_ptr->zowner = 0;
(void)png_crc_finish(png_ptr, png_ptr->idat_size);
}
}
void
png_read_finish_row(png_structrp png_ptr)
{
static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
png_debug(1, "in png_read_finish_row");
png_ptr->row_number++;
if (png_ptr->row_number < png_ptr->num_rows)
return;
if (png_ptr->interlaced != 0)
{
png_ptr->row_number = 0;
memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
do
{
png_ptr->pass++;
if (png_ptr->pass >= 7)
break;
png_ptr->iwidth = (png_ptr->width +
png_pass_inc[png_ptr->pass] - 1 -
png_pass_start[png_ptr->pass]) /
png_pass_inc[png_ptr->pass];
if ((png_ptr->transformations & PNG_INTERLACE) == 0)
{
png_ptr->num_rows = (png_ptr->height +
png_pass_yinc[png_ptr->pass] - 1 -
png_pass_ystart[png_ptr->pass]) /
png_pass_yinc[png_ptr->pass];
}
else
break;
} while (png_ptr->num_rows == 0 || png_ptr->iwidth == 0);
if (png_ptr->pass < 7)
return;
}
png_read_finish_IDAT(png_ptr);
}
#endif
void
png_read_start_row(png_structrp png_ptr)
{
static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
int max_pixel_depth;
png_size_t row_bytes;
png_debug(1, "in png_read_start_row");
#ifdef PNG_READ_TRANSFORMS_SUPPORTED
png_init_read_transformations(png_ptr);
#endif
if (png_ptr->interlaced != 0)
{
if ((png_ptr->transformations & PNG_INTERLACE) == 0)
png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 -
png_pass_ystart[0]) / png_pass_yinc[0];
else
png_ptr->num_rows = png_ptr->height;
png_ptr->iwidth = (png_ptr->width +
png_pass_inc[png_ptr->pass] - 1 -
png_pass_start[png_ptr->pass]) /
png_pass_inc[png_ptr->pass];
}
else
{
png_ptr->num_rows = png_ptr->height;
png_ptr->iwidth = png_ptr->width;
}
max_pixel_depth = png_ptr->pixel_depth;
#ifdef PNG_READ_PACK_SUPPORTED
if ((png_ptr->transformations & PNG_PACK) != 0 && png_ptr->bit_depth < 8)
max_pixel_depth = 8;
#endif
#ifdef PNG_READ_EXPAND_SUPPORTED
if ((png_ptr->transformations & PNG_EXPAND) != 0)
{
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
if (png_ptr->num_trans != 0)
max_pixel_depth = 32;
else
max_pixel_depth = 24;
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
{
if (max_pixel_depth < 8)
max_pixel_depth = 8;
if (png_ptr->num_trans != 0)
max_pixel_depth *= 2;
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
{
if (png_ptr->num_trans != 0)
{
max_pixel_depth *= 4;
max_pixel_depth /= 3;
}
}
}
#endif
#ifdef PNG_READ_EXPAND_16_SUPPORTED
if ((png_ptr->transformations & PNG_EXPAND_16) != 0)
{
# ifdef PNG_READ_EXPAND_SUPPORTED
if ((png_ptr->transformations & PNG_EXPAND) != 0)
{
if (png_ptr->bit_depth < 16)
max_pixel_depth *= 2;
}
else
# endif
png_ptr->transformations &= ~PNG_EXPAND_16;
}
#endif
#ifdef PNG_READ_FILLER_SUPPORTED
if ((png_ptr->transformations & (PNG_FILLER)) != 0)
{
if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
{
if (max_pixel_depth <= 8)
max_pixel_depth = 16;
else
max_pixel_depth = 32;
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB ||
png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
if (max_pixel_depth <= 32)
max_pixel_depth = 32;
else
max_pixel_depth = 64;
}
}
#endif
#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
if ((png_ptr->transformations & PNG_GRAY_TO_RGB) != 0)
{
if (
#ifdef PNG_READ_EXPAND_SUPPORTED
(png_ptr->num_trans != 0 &&
(png_ptr->transformations & PNG_EXPAND) != 0) ||
#endif
#ifdef PNG_READ_FILLER_SUPPORTED
(png_ptr->transformations & (PNG_FILLER)) != 0 ||
#endif
png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
{
if (max_pixel_depth <= 16)
max_pixel_depth = 32;
else
max_pixel_depth = 64;
}
else
{
if (max_pixel_depth <= 8)
{
if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
max_pixel_depth = 32;
else
max_pixel_depth = 24;
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
max_pixel_depth = 64;
else
max_pixel_depth = 48;
}
}
#endif
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) && \
defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
if ((png_ptr->transformations & PNG_USER_TRANSFORM) != 0)
{
int user_pixel_depth = png_ptr->user_transform_depth *
png_ptr->user_transform_channels;
if (user_pixel_depth > max_pixel_depth)
max_pixel_depth = user_pixel_depth;
}
#endif
png_ptr->maximum_pixel_depth = (png_byte)max_pixel_depth;
png_ptr->transformed_pixel_depth = 0;
row_bytes = ((png_ptr->width + 7) & ~((png_uint_32)7));
row_bytes = PNG_ROWBYTES(max_pixel_depth, row_bytes) +
1 + ((max_pixel_depth + 7) >> 3);
#ifdef PNG_MAX_MALLOC_64K
if (row_bytes > (png_uint_32)65536L)
png_error(png_ptr, "This image requires a row greater than 64KB");
#endif
if (row_bytes + 48 > png_ptr->old_big_row_buf_size)
{
png_free(png_ptr, png_ptr->big_row_buf);
png_free(png_ptr, png_ptr->big_prev_row);
if (png_ptr->interlaced != 0)
png_ptr->big_row_buf = (png_bytep)png_calloc(png_ptr,
row_bytes + 48);
else
png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes + 48);
png_ptr->big_prev_row = (png_bytep)png_malloc(png_ptr, row_bytes + 48);
#ifdef PNG_ALIGNED_MEMORY_SUPPORTED
{
png_bytep temp = png_ptr->big_row_buf + 32;
int extra = (int)((temp - (png_bytep)0) & 0x0f);
png_ptr->row_buf = temp - extra - 1;
temp = png_ptr->big_prev_row + 32;
extra = (int)((temp - (png_bytep)0) & 0x0f);
png_ptr->prev_row = temp - extra - 1;
}
#else
png_ptr->row_buf = png_ptr->big_row_buf + 31;
png_ptr->prev_row = png_ptr->big_prev_row + 31;
#endif
png_ptr->old_big_row_buf_size = row_bytes + 48;
}
#ifdef PNG_MAX_MALLOC_64K
if (png_ptr->rowbytes > 65535)
png_error(png_ptr, "This image requires a row greater than 64KB");
#endif
if (png_ptr->rowbytes > (PNG_SIZE_MAX - 1))
png_error(png_ptr, "Row has too many bytes to allocate in memory");
memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
png_debug1(3, "width = %u,", png_ptr->width);
png_debug1(3, "height = %u,", png_ptr->height);
png_debug1(3, "iwidth = %u,", png_ptr->iwidth);
png_debug1(3, "num_rows = %u,", png_ptr->num_rows);
png_debug1(3, "rowbytes = %lu,", (unsigned long)png_ptr->rowbytes);
png_debug1(3, "irowbytes = %lu",
(unsigned long)PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1);
if (png_ptr->read_buffer != 0)
{
png_bytep buffer = png_ptr->read_buffer;
png_ptr->read_buffer_size = 0;
png_ptr->read_buffer = NULL;
png_free(png_ptr, buffer);
}
if (png_inflate_claim(png_ptr, png_IDAT) != Z_OK)
png_error(png_ptr, png_ptr->zstream.msg);
png_ptr->flags |= PNG_FLAG_ROW_INIT;
}
#endif