/* pngwutil.c - utilities to write a PNG file
*
- * Last changed in libpng 1.6.21 [January 15, 2016]
- * Copyright (c) 1998-2002,2004,2006-2015 Glenn Randers-Pehrson
+ * Last changed in libpng 1.6.24 [August 4, 2016]
+ * Copyright (c) 1998-2002,2004,2006-2016 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.)
*
void PNGAPI
png_save_uint_32(png_bytep buf, png_uint_32 i)
{
- buf[0] = (png_byte)(i >> 24);
- buf[1] = (png_byte)(i >> 16);
- buf[2] = (png_byte)(i >> 8);
- buf[3] = (png_byte)(i );
+ buf[0] = (png_byte)((i >> 24) & 0xffU);
+ buf[1] = (png_byte)((i >> 16) & 0xffU);
+ buf[2] = (png_byte)((i >> 8) & 0xffU);
+ buf[3] = (png_byte)( i & 0xffU);
}
/* Place a 16-bit number into a buffer in PNG byte order.
void PNGAPI
png_save_uint_16(png_bytep buf, unsigned int i)
{
- buf[0] = (png_byte)(i >> 8);
- buf[1] = (png_byte)(i );
+ buf[0] = (png_byte)((i >> 8) & 0xffU);
+ buf[1] = (png_byte)( i & 0xffU);
}
#endif
/* Write the rest of the 8 byte signature */
png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes],
- (png_size_t)(8 - png_ptr->sig_bytes));
+ (png_size_t)(8 - png_ptr->sig_bytes));
if (png_ptr->sig_bytes < 3)
png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
*/
static void
png_write_complete_chunk(png_structrp png_ptr, png_uint_32 chunk_name,
- png_const_bytep data, png_size_t length)
+ png_const_bytep data, png_size_t length)
{
if (png_ptr == NULL)
return;
/* This is the API that calls the internal function above. */
void PNGAPI
png_write_chunk(png_structrp png_ptr, png_const_bytep chunk_string,
- png_const_bytep data, png_size_t length)
+ png_const_bytep data, png_size_t length)
{
png_write_complete_chunk(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), data,
- length);
+ length);
}
/* This is used below to find the size of an image to pass to png_deflate_claim,
/* Initialize the compressor for the appropriate type of compression. */
static int
png_deflate_claim(png_structrp png_ptr, png_uint_32 owner,
- png_alloc_size_t data_size)
+ png_alloc_size_t data_size)
{
if (png_ptr->zowner != 0)
{
else
{
ret = deflateInit2(&png_ptr->zstream, level, method, windowBits,
- memLevel, strategy);
+ memLevel, strategy);
if (ret == Z_OK)
png_ptr->flags |= PNG_FLAG_ZSTREAM_INITIALIZED;
static void
png_text_compress_init(compression_state *comp, png_const_bytep input,
- png_alloc_size_t input_len)
+ png_alloc_size_t input_len)
{
comp->input = input;
comp->input_len = input_len;
/* Compress the data in the compression state input */
static int
png_text_compress(png_structrp png_ptr, png_uint_32 chunk_name,
- compression_state *comp, png_uint_32 prefix_len)
+ compression_state *comp, png_uint_32 prefix_len)
{
int ret;
/* Compress the data */
ret = deflate(&png_ptr->zstream,
- input_len > 0 ? Z_NO_FLUSH : Z_FINISH);
+ input_len > 0 ? Z_NO_FLUSH : Z_FINISH);
/* Claw back input data that was not consumed (because avail_in is
* reset above every time round the loop).
*/
void /* PRIVATE */
png_compress_IDAT(png_structrp png_ptr, png_const_bytep input,
- png_alloc_size_t input_len, int flush)
+ png_alloc_size_t input_len, int flush)
{
if (png_ptr->zowner != png_IDAT)
{
if (png_ptr->zbuffer_list == NULL)
{
png_ptr->zbuffer_list = png_voidcast(png_compression_bufferp,
- png_malloc(png_ptr, PNG_COMPRESSION_BUFFER_SIZE(png_ptr)));
+ png_malloc(png_ptr, PNG_COMPRESSION_BUFFER_SIZE(png_ptr)));
png_ptr->zbuffer_list->next = NULL;
}
/* Write the chunk out as it is */
png_write_complete_chunk(png_ptr, png_tRNS, trans_alpha,
- (png_size_t)num_trans);
+ (png_size_t)num_trans);
}
else if (color_type == PNG_COLOR_TYPE_GRAY)
#endif
{
png_app_warning(png_ptr,
- "Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8");
+ "Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8");
return;
}
#endif
{
png_warning(png_ptr,
- "Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8");
+ "Ignoring attempt to write 16-bit bKGD chunk "
+ "when bit_depth is 8");
return;
}
/* Compute the compressed data; do it now for the length */
png_text_compress_init(&comp, (png_const_bytep)text,
- text == NULL ? 0 : strlen(text));
+ text == NULL ? 0 : strlen(text));
if (png_text_compress(png_ptr, png_zTXt, &comp, key_len) != Z_OK)
png_error(png_ptr, png_ptr->zstream.msg);
*/
if ((filters & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH)) != 0)
png_ptr->prev_row = png_voidcast(png_bytep,
- png_calloc(png_ptr, buf_size));
+ png_calloc(png_ptr, buf_size));
#endif /* WRITE_FILTER */
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
*/
static void /* PRIVATE */
png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row,
- png_size_t row_bytes);
+ png_size_t row_bytes);
#ifdef PNG_WRITE_FILTER_SUPPORTED
static png_size_t /* PRIVATE */
i++, rp++, dp++)
{
v = *dp = *rp;
+#ifdef PNG_USE_ABS
+ sum += 128 - abs(v - 128);
+#else
sum += (v < 128) ? v : 256 - v;
+#endif
}
for (lp = png_ptr->row_buf + 1; i < row_bytes;
i++, rp++, lp++, dp++)
{
v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
+#ifdef PNG_USE_ABS
+ sum += 128 - abs(v - 128);
+#else
sum += (v < 128) ? v : 256 - v;
+#endif
if (sum > lmins) /* We are already worse, don't continue. */
break;
return (sum);
}
+static void /* PRIVATE */
+png_setup_sub_row_only(png_structrp png_ptr, const png_uint_32 bpp,
+ const png_size_t row_bytes)
+{
+ png_bytep rp, dp, lp;
+ png_size_t i;
+
+ png_ptr->try_row[0] = PNG_FILTER_VALUE_SUB;
+
+ for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1; i < bpp;
+ i++, rp++, dp++)
+ {
+ *dp = *rp;
+ }
+
+ for (lp = png_ptr->row_buf + 1; i < row_bytes;
+ i++, rp++, lp++, dp++)
+ {
+ *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
+ }
+}
+
static png_size_t /* PRIVATE */
png_setup_up_row(png_structrp png_ptr, const png_size_t row_bytes,
const png_size_t lmins)
i++, rp++, pp++, dp++)
{
v = *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
+#ifdef PNG_USE_ABS
+ sum += 128 - abs(v - 128);
+#else
sum += (v < 128) ? v : 256 - v;
+#endif
if (sum > lmins) /* We are already worse, don't continue. */
break;
return (sum);
}
+static void /* PRIVATE */
+png_setup_up_row_only(png_structrp png_ptr, const png_size_t row_bytes)
+{
+ png_bytep rp, dp, pp;
+ png_size_t i;
+
+ png_ptr->try_row[0] = PNG_FILTER_VALUE_UP;
+
+ for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1,
+ pp = png_ptr->prev_row + 1; i < row_bytes;
+ i++, rp++, pp++, dp++)
+ {
+ *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
+ }
+}
static png_size_t /* PRIVATE */
png_setup_avg_row(png_structrp png_ptr, const png_uint_32 bpp,
- const png_size_t row_bytes, const png_size_t lmins)
+ const png_size_t row_bytes, const png_size_t lmins)
{
png_bytep rp, dp, pp, lp;
png_uint_32 i;
png_ptr->try_row[0] = PNG_FILTER_VALUE_AVG;
for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1,
- pp = png_ptr->prev_row + 1; i < bpp; i++)
+ pp = png_ptr->prev_row + 1; i < bpp; i++)
{
v = *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);
+#ifdef PNG_USE_ABS
+ sum += 128 - abs(v - 128);
+#else
sum += (v < 128) ? v : 256 - v;
+#endif
}
for (lp = png_ptr->row_buf + 1; i < row_bytes; i++)
v = *dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2))
& 0xff);
+#ifdef PNG_USE_ABS
+ sum += 128 - abs(v - 128);
+#else
sum += (v < 128) ? v : 256 - v;
+#endif
if (sum > lmins) /* We are already worse, don't continue. */
break;
return (sum);
}
+static void /* PRIVATE */
+png_setup_avg_row_only(png_structrp png_ptr, const png_uint_32 bpp,
+ const png_size_t row_bytes)
+{
+ png_bytep rp, dp, pp, lp;
+ png_uint_32 i;
+
+ png_ptr->try_row[0] = PNG_FILTER_VALUE_AVG;
+
+ for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1,
+ pp = png_ptr->prev_row + 1; i < bpp; i++)
+ {
+ *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);
+ }
+
+ for (lp = png_ptr->row_buf + 1; i < row_bytes; i++)
+ {
+ *dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2))
+ & 0xff);
+ }
+}
static png_size_t /* PRIVATE */
png_setup_paeth_row(png_structrp png_ptr, const png_uint_32 bpp,
{
v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
+#ifdef PNG_USE_ABS
+ sum += 128 - abs(v - 128);
+#else
sum += (v < 128) ? v : 256 - v;
+#endif
}
for (lp = png_ptr->row_buf + 1, cp = png_ptr->prev_row + 1; i < row_bytes;
v = *dp++ = (png_byte)(((int)*rp++ - p) & 0xff);
+#ifdef PNG_USE_ABS
+ sum += 128 - abs(v - 128);
+#else
sum += (v < 128) ? v : 256 - v;
+#endif
if (sum > lmins) /* We are already worse, don't continue. */
break;
return (sum);
}
+static void /* PRIVATE */
+png_setup_paeth_row_only(png_structrp png_ptr, const png_uint_32 bpp,
+ const png_size_t row_bytes)
+{
+ png_bytep rp, dp, pp, cp, lp;
+ png_size_t i;
+
+ png_ptr->try_row[0] = PNG_FILTER_VALUE_PAETH;
+
+ for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1,
+ pp = png_ptr->prev_row + 1; i < bpp; i++)
+ {
+ *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
+ }
+
+ for (lp = png_ptr->row_buf + 1, cp = png_ptr->prev_row + 1; i < row_bytes;
+ i++)
+ {
+ int a, b, c, pa, pb, pc, p;
+
+ b = *pp++;
+ c = *cp++;
+ a = *lp++;
+
+ 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
+
+ p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;
+
+ *dp++ = (png_byte)(((int)*rp++ - p) & 0xff);
+ }
+}
#endif /* WRITE_FILTER */
void /* PRIVATE */
#ifndef PNG_WRITE_FILTER_SUPPORTED
png_write_filtered_row(png_ptr, png_ptr->row_buf, row_info->rowbytes+1);
#else
- png_byte filter_to_do = png_ptr->do_filter;
+ unsigned int filter_to_do = png_ptr->do_filter;
png_bytep row_buf;
png_bytep best_row;
png_uint_32 bpp;
*/
best_row = png_ptr->row_buf;
-
- if ((filter_to_do & PNG_FILTER_NONE) != 0 && filter_to_do != PNG_FILTER_NONE)
+ if (PNG_SIZE_MAX/128 <= row_bytes)
{
+ /* Overflow can occur in the calculation, just select the lowest set
+ * filter.
+ */
+ filter_to_do &= 0U-filter_to_do;
+ }
+ else if ((filter_to_do & PNG_FILTER_NONE) != 0 &&
+ filter_to_do != PNG_FILTER_NONE)
+ {
+ /* Overflow not possible and multiple filters in the list, including the
+ * 'none' filter.
+ */
png_bytep rp;
png_size_t sum = 0;
png_size_t i;
int v;
- if (PNG_SIZE_MAX/128 <= row_bytes)
- {
- for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++)
- {
- /* Check for overflow */
- if (sum > PNG_SIZE_MAX/128 - 256)
- break;
-
- v = *rp;
- sum += (v < 128) ? v : 256 - v;
- }
- }
- else /* Overflow is not possible */
{
for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++)
{
v = *rp;
+#ifdef PNG_USE_ABS
+ sum += 128 - abs(v - 128);
+#else
sum += (v < 128) ? v : 256 - v;
+#endif
}
}
if (filter_to_do == PNG_FILTER_SUB)
/* It's the only filter so no testing is needed */
{
- (void) png_setup_sub_row(png_ptr, bpp, row_bytes, mins);
+ png_setup_sub_row_only(png_ptr, bpp, row_bytes);
best_row = png_ptr->try_row;
}
/* Up filter */
if (filter_to_do == PNG_FILTER_UP)
{
- (void) png_setup_up_row(png_ptr, row_bytes, mins);
+ png_setup_up_row_only(png_ptr, row_bytes);
best_row = png_ptr->try_row;
}
/* Avg filter */
if (filter_to_do == PNG_FILTER_AVG)
{
- (void) png_setup_avg_row(png_ptr, bpp, row_bytes, mins);
+ png_setup_avg_row_only(png_ptr, bpp, row_bytes);
best_row = png_ptr->try_row;
}
}
/* Paeth filter */
- if ((filter_to_do == PNG_FILTER_PAETH) != 0)
+ if (filter_to_do == PNG_FILTER_PAETH)
{
- (void) png_setup_paeth_row(png_ptr, bpp, row_bytes, mins);
+ png_setup_paeth_row_only(png_ptr, bpp, row_bytes);
best_row = png_ptr->try_row;
}
/* Do the actual writing of a previously filtered row. */
static void
png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row,
- png_size_t full_row_length/*includes filter byte*/)
+ png_size_t full_row_length/*includes filter byte*/)
{
png_debug(1, "in png_write_filtered_row");
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