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Imported from libpng-0.99d.tar

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This commit is contained in:
Glenn Randers-Pehrson
1998-02-08 20:56:40 -06:00
parent 0f881d62b3
commit a357b99113
24 changed files with 3267 additions and 1198 deletions
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61
pngrutil.c
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@@ -6,7 +6,7 @@
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* February 7, 1998
* February 8, 1998
*
* This file contains routines which are only called from within
* libpng itself during the course of reading an image.
@@ -345,6 +345,10 @@ png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
if (!(png_ptr->mode & PNG_HAVE_IHDR) || !(png_ptr->mode & PNG_HAVE_IDAT))
{
png_error(png_ptr, "No image in file");
/* to quiet compiler warnings about unused info_ptr */
if (info_ptr == NULL)
return;
}
png_ptr->mode |= PNG_AFTER_IDAT | PNG_HAVE_IEND;
@@ -722,7 +726,7 @@ png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
}
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
{
png_warning(png_ptr, "Duplcate tRNS chunk");
png_warning(png_ptr, "Duplicate tRNS chunk");
png_crc_finish(png_ptr, length);
return;
}
@@ -1022,6 +1026,7 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_byte type, nparams;
png_charp buf, units, endptr;
png_charpp params;
png_size_t slength;
int i;
png_debug(1, "in png_handle_pCAL\n");
@@ -1044,7 +1049,8 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_debug1(2, "Allocating and reading pCAL chunk data (%d bytes)\n",
length + 1);
purpose = (png_charp)png_malloc(png_ptr, length + 1);
png_crc_read(png_ptr, (png_bytep)purpose, (png_size_t)length);
slength = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)purpose, slength);
if (png_crc_finish(png_ptr, 0))
{
@@ -1052,13 +1058,13 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
return;
}
purpose[length] = '\0'; /* null terminate the last string */
purpose[slength] = 0x00; /* null terminate the last string */
png_debug(3, "Finding end of pCAL purpose string\n");
for (buf = purpose; *buf != '\0'; buf++)
/* empty loop */;
endptr = purpose + length;
endptr = purpose + slength;
/* We need to have at least 12 bytes after the purpose string
in order to get the parameter information. */
@@ -1094,7 +1100,7 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
}
/* Empty loop to move past the units string. */
for (buf = units; *buf != '\0'; buf++);
for (buf = units; *buf != 0x00; buf++);
png_debug(3, "Allocating pCAL parameters array\n");
params = (png_charpp)png_malloc(png_ptr, (png_uint_32)(nparams
@@ -1107,7 +1113,7 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_debug1(3, "Reading pCAL parameter %d\n", i);
/* Empty loop to move past each paramter string */
for (params[i] = buf; *buf != '\0' && buf <= endptr; buf++);
for (params[i] = buf; *buf != 0x00 && buf <= endptr; buf++);
/* Make sure we haven't run out of data yet */
if (buf > endptr)
@@ -1179,6 +1185,7 @@ png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_charp key;
png_charp text;
png_uint_32 skip = 0;
png_size_t slength;
png_debug(1, "in png_handle_tEXt\n");
@@ -1198,7 +1205,8 @@ png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#endif
key = (png_charp)png_malloc(png_ptr, length + 1);
png_crc_read(png_ptr, (png_bytep)key, (png_size_t)length);
slength = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)key, slength);
if (png_crc_finish(png_ptr, skip))
{
@@ -1206,12 +1214,12 @@ png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
return;
}
key[length] = '\0';
key[slength] = 0x00;
for (text = key; *text; text++)
/* empty loop to find end of key */ ;
if (text != key + (png_size_t)length)
if (text != key + slength)
text++;
text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
@@ -1235,6 +1243,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_charp key;
png_charp text;
int comp_type = PNG_TEXT_COMPRESSION_NONE;
png_size_t slength;
png_debug(1, "in png_handle_zTXt\n");
@@ -1256,20 +1265,21 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#endif
key = (png_charp)png_malloc(png_ptr, length + 1);
png_crc_read(png_ptr, (png_bytep)key, (png_size_t)length);
slength = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)key, slength);
if (png_crc_finish(png_ptr, 0))
{
png_free(png_ptr, key);
return;
}
key[length] = '\0';
key[slength] = 0x00;
for (text = key; *text; text++)
/* empty loop */ ;
/* zTXt must have some text after the keyword */
if (text == key + (png_size_t)length)
if (text == key + slength)
{
png_warning(png_ptr, "Zero length zTXt chunk");
}
@@ -1283,7 +1293,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = png_ptr->zbuf_size;
key_size = text - key;
key_size = (png_size_t)(text - key);
text_size = 0;
text = NULL;
@@ -1308,10 +1318,10 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_memcpy(text, key, key_size);
}
text[text_size - 1] = '\0';
text[text_size - 1] = 0x00;
/* Copy what we can of the error message into the text chunk */
text_size = (png_size_t)length - (text - key) - 1;
text_size = (png_size_t)(slength - (text - key) - 1);
text_size = sizeof(msg) > text_size ? text_size : sizeof(msg);
png_memcpy(text + key_size, msg, text_size + 1);
break;
@@ -1328,7 +1338,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_memcpy(text, key, key_size);
text_size = key_size + png_ptr->zbuf_size -
png_ptr->zstream.avail_out;
*(text + text_size) = '\0';
*(text + text_size) = 0x00;
}
else
{
@@ -1342,7 +1352,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_memcpy(text + text_size, png_ptr->zbuf,
(png_ptr->zbuf_size - png_ptr->zstream.avail_out));
text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
*(text + text_size) = '\0';
*(text + text_size) = 0x00;
}
if (ret != Z_STREAM_END)
{
@@ -1376,7 +1386,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#endif
/* Copy what we can of the error message into the text chunk */
text_size = (png_size_t)length - (text - key) - 1;
text_size = (png_size_t)(slength - (text - key) - 1);
text_size = sizeof(msg) > text_size ? text_size : sizeof(msg);
png_memcpy(text, msg, text_size + 1);
}
@@ -1409,12 +1419,17 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
if (!(png_ptr->chunk_name[0] & 0x20))
{
png_chunk_error(png_ptr, "unknown critical chunk");
/* to quiet compiler warnings about unused info_ptr */
if (info_ptr == NULL)
return;
}
if (png_ptr->mode & PNG_HAVE_IDAT)
png_ptr->mode |= PNG_AFTER_IDAT;
png_crc_finish(png_ptr, length);
}
/* This function is called to verify that a chunk name is valid.
@@ -1847,8 +1862,8 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
pixel_bytes = (row_info->pixel_depth >> 3);
sp = row + (row_info->width - 1) * pixel_bytes;
dp = row + (final_width - 1) * pixel_bytes;
sp = row + (png_size_t)(row_info->width - 1) * pixel_bytes;
dp = row + (png_size_t)(final_width - 1) * pixel_bytes;
for (i = row_info->width; i; i--)
{
png_byte v[8];
@@ -1993,7 +2008,7 @@ png_read_finish_row(png_structp png_ptr)
if (png_ptr->interlaced)
{
png_ptr->row_number = 0;
png_buffered_memset(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
png_memset_check(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
do
{
png_ptr->pass++;
@@ -2203,7 +2218,7 @@ png_read_start_row(png_structp png_ptr)
png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
png_ptr->rowbytes + 1));
png_buffered_memset(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
png_memset_check(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
png_debug1(3, "width = %d,\n", png_ptr->width);
png_debug1(3, "height = %d,\n", png_ptr->height);