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[libpng15] Updated contrib/pngminus/pnm2png.c (Paul Stewart):

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Fixed whitespace handling
Added a call to png_set_packing()
Initialize dimension values so if sscanf fails at least we have known
invalid values.
This commit is contained in:
Glenn Randers-Pehrson
2013-05-09 12:43:25 -05:00
parent a5173354d2
commit dc7e768526
3 changed files with 73 additions and 42 deletions
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91
contrib/pngminus/pnm2png.c
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@@ -197,15 +197,16 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
char height_token[16];
char maxval_token[16];
int color_type;
png_uint_32 width, alpha_width;
png_uint_32 height, alpha_height;
png_uint_32 maxval;
png_uint_32 width = 0, alpha_width = 0;
png_uint_32 height = 0, alpha_height = 0;
png_uint_32 maxval = 0;
int bit_depth = 0;
int channels;
int alpha_depth = 0;
int alpha_present;
int row, col;
BOOL raw, alpha_raw = FALSE;
BOOL packed_bitmap = FALSE;
png_uint_32 tmp16;
int i;
@@ -220,7 +221,12 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
{
raw = (type_token[1] == '4');
color_type = PNG_COLOR_TYPE_GRAY;
get_token(pnm_file, width_token);
sscanf (width_token, "%lu", &width);
get_token(pnm_file, height_token);
sscanf (height_token, "%lu", &height);
bit_depth = 1;
packed_bitmap = TRUE;
}
else if ((type_token[1] == '2') || (type_token[1] == '5'))
{
@@ -329,8 +335,12 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
alpha_present = (channels - 1) % 2;
/* row_bytes is the width x number of channels x (bit-depth / 8) */
row_bytes = width * channels * ((bit_depth <= 8) ? 1 : 2);
if (packed_bitmap)
/* row data is as many bytes as can fit width x channels x bit_depth */
row_bytes = (width * channels * bit_depth + 7) / 8;
else
/* row_bytes is the width x number of channels x (bit-depth / 8) */
row_bytes = width * channels * ((bit_depth <= 8) ? 1 : 2);
if ((png_pixels = (png_byte *) malloc (row_bytes * height * sizeof (png_byte))) == NULL)
return FALSE;
@@ -340,40 +350,45 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
for (row = 0; row < height; row++)
{
for (col = 0; col < width; col++)
{
for (i = 0; i < (channels - alpha_present); i++)
if (packed_bitmap) {
for (i = 0; i < row_bytes; i++)
/* png supports this format natively so no conversion is needed */
*pix_ptr++ = get_data (pnm_file, 8);
} else {
for (col = 0; col < width; col++)
{
if (raw)
*pix_ptr++ = get_data (pnm_file, bit_depth);
else
if (bit_depth <= 8)
*pix_ptr++ = get_value (pnm_file, bit_depth);
for (i = 0; i < (channels - alpha_present); i++)
{
if (raw)
*pix_ptr++ = get_data (pnm_file, bit_depth);
else
{
tmp16 = get_value (pnm_file, bit_depth);
*pix_ptr = (png_byte) ((tmp16 >> 8) & 0xFF);
pix_ptr++;
*pix_ptr = (png_byte) (tmp16 & 0xFF);
pix_ptr++;
}
}
if (bit_depth <= 8)
*pix_ptr++ = get_value (pnm_file, bit_depth);
else
{
tmp16 = get_value (pnm_file, bit_depth);
*pix_ptr = (png_byte) ((tmp16 >> 8) & 0xFF);
pix_ptr++;
*pix_ptr = (png_byte) (tmp16 & 0xFF);
pix_ptr++;
}
}
if (alpha) /* read alpha-channel from pgm file */
{
if (alpha_raw)
*pix_ptr++ = get_data (alpha_file, alpha_depth);
else
if (alpha_depth <= 8)
*pix_ptr++ = get_value (alpha_file, bit_depth);
if (alpha) /* read alpha-channel from pgm file */
{
if (alpha_raw)
*pix_ptr++ = get_data (alpha_file, alpha_depth);
else
{
tmp16 = get_value (alpha_file, bit_depth);
*pix_ptr++ = (png_byte) ((tmp16 >> 8) & 0xFF);
*pix_ptr++ = (png_byte) (tmp16 & 0xFF);
}
} /* if alpha */
if (alpha_depth <= 8)
*pix_ptr++ = get_value (alpha_file, bit_depth);
else
{
tmp16 = get_value (alpha_file, bit_depth);
*pix_ptr++ = (png_byte) ((tmp16 >> 8) & 0xFF);
*pix_ptr++ = (png_byte) (tmp16 & 0xFF);
}
} /* if alpha */
} /* if packed_bitmap */
} /* end for col */
} /* end for row */
@@ -390,6 +405,12 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
return FALSE;
}
if (packed_bitmap == TRUE)
{
png_set_packing (png_ptr);
png_set_invert_mono (png_ptr);
}
/* setjmp() must be called in every function that calls a PNG-reading libpng function */
if (setjmp (png_jmpbuf(png_ptr)))
{