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libpng/pngpread.c

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1995-12-19 09:22:19 +00:00
/* pngpread.c - read a png file in push mode
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*
* Last changed in libpng 1.2.58 [August 24, 2017]
* Copyright (c) 1998-2002,2004,2006-2015,2017 Glenn Randers-Pehrson
2000-06-04 19:29:29 +00:00
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
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*/
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#define PNG_INTERNAL
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#define PNG_NO_PEDANTIC_WARNINGS
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#include "png.h"
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#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
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/* Push model modes */
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#define PNG_READ_SIG_MODE 0
#define PNG_READ_CHUNK_MODE 1
#define PNG_READ_IDAT_MODE 2
#define PNG_SKIP_MODE 3
#define PNG_READ_tEXt_MODE 4
#define PNG_READ_zTXt_MODE 5
#define PNG_READ_DONE_MODE 6
#define PNG_READ_iTXt_MODE 7
#define PNG_ERROR_MODE 8
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void PNGAPI
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png_process_data(png_structp png_ptr, png_infop info_ptr,
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png_bytep buffer, png_size_t buffer_size)
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{
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if (png_ptr == NULL || info_ptr == NULL)
return;
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png_push_restore_buffer(png_ptr, buffer, buffer_size);
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while (png_ptr->buffer_size)
{
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png_process_some_data(png_ptr, info_ptr);
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}
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}
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/* What we do with the incoming data depends on what we were previously
* doing before we ran out of data...
*/
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void /* PRIVATE */
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png_process_some_data(png_structp png_ptr, png_infop info_ptr)
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{
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if (png_ptr == NULL)
return;
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switch (png_ptr->process_mode)
{
case PNG_READ_SIG_MODE:
{
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png_push_read_sig(png_ptr, info_ptr);
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break;
}
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case PNG_READ_CHUNK_MODE:
{
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png_push_read_chunk(png_ptr, info_ptr);
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break;
}
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case PNG_READ_IDAT_MODE:
{
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png_push_read_IDAT(png_ptr);
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break;
}
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case PNG_SKIP_MODE:
{
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png_push_crc_finish(png_ptr);
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break;
}
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default:
{
png_ptr->buffer_size = 0;
break;
}
}
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}
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/* Read any remaining signature bytes from the stream and compare them with
* the correct PNG signature. It is possible that this routine is called
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* with bytes already read from the signature, either because they have been
* checked by the calling application, or because of multiple calls to this
* routine.
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*/
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void /* PRIVATE */
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png_push_read_sig(png_structp png_ptr, png_infop info_ptr)
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{
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png_size_t num_checked = png_ptr->sig_bytes,
num_to_check = 8 - num_checked;
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if (png_ptr->buffer_size < num_to_check)
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{
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num_to_check = png_ptr->buffer_size;
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}
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png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]),
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num_to_check);
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png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes + num_to_check);
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if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
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{
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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");
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}
else
{
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if (png_ptr->sig_bytes >= 8)
{
png_ptr->process_mode = PNG_READ_CHUNK_MODE;
}
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}
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}
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void /* PRIVATE */
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png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
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{
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#ifdef PNG_USE_LOCAL_ARRAYS
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PNG_CONST PNG_IHDR;
PNG_CONST PNG_IDAT;
PNG_CONST PNG_IEND;
PNG_CONST PNG_PLTE;
#ifdef PNG_READ_bKGD_SUPPORTED
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PNG_CONST PNG_bKGD;
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#endif
#ifdef PNG_READ_cHRM_SUPPORTED
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PNG_CONST PNG_cHRM;
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#endif
#ifdef PNG_READ_gAMA_SUPPORTED
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PNG_CONST PNG_gAMA;
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#endif
#ifdef PNG_READ_hIST_SUPPORTED
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PNG_CONST PNG_hIST;
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#endif
#ifdef PNG_READ_iCCP_SUPPORTED
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PNG_CONST PNG_iCCP;
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#endif
#ifdef PNG_READ_iTXt_SUPPORTED
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PNG_CONST PNG_iTXt;
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#endif
#ifdef PNG_READ_oFFs_SUPPORTED
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PNG_CONST PNG_oFFs;
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#endif
#ifdef PNG_READ_pCAL_SUPPORTED
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PNG_CONST PNG_pCAL;
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#endif
#ifdef PNG_READ_pHYs_SUPPORTED
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PNG_CONST PNG_pHYs;
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#endif
#ifdef PNG_READ_sBIT_SUPPORTED
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PNG_CONST PNG_sBIT;
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#endif
#ifdef PNG_READ_sCAL_SUPPORTED
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PNG_CONST PNG_sCAL;
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#endif
#ifdef PNG_READ_sRGB_SUPPORTED
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PNG_CONST PNG_sRGB;
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#endif
#ifdef PNG_READ_sPLT_SUPPORTED
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PNG_CONST PNG_sPLT;
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#endif
#ifdef PNG_READ_tEXt_SUPPORTED
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PNG_CONST PNG_tEXt;
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#endif
#ifdef PNG_READ_tIME_SUPPORTED
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PNG_CONST PNG_tIME;
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#endif
#ifdef PNG_READ_tRNS_SUPPORTED
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PNG_CONST PNG_tRNS;
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#endif
#ifdef PNG_READ_zTXt_SUPPORTED
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PNG_CONST PNG_zTXt;
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#endif
#endif /* PNG_USE_LOCAL_ARRAYS */
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/* First we make sure we have enough data for the 4 byte chunk name
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* and the 4 byte chunk length before proceeding with decoding the
* chunk data. To fully decode each of these chunks, we also make
* sure we have enough data in the buffer for the 4 byte CRC at the
* end of every chunk (except IDAT, which is handled separately).
*/
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if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
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{
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png_byte chunk_length[4];
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if (png_ptr->buffer_size < 8)
{
png_push_save_buffer(png_ptr);
return;
}
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png_push_fill_buffer(png_ptr, chunk_length, 4);
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png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
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png_reset_crc(png_ptr);
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png_crc_read(png_ptr, png_ptr->chunk_name, 4);
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png_check_chunk_name(png_ptr, png_ptr->chunk_name);
png_check_chunk_length(png_ptr, png_ptr->push_length);
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png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
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}
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if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
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if (png_ptr->mode & PNG_AFTER_IDAT)
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png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
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if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
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{
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if (png_ptr->push_length != 13)
png_error(png_ptr, "Invalid IHDR length");
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if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length);
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}
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else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length);
png_ptr->process_mode = PNG_READ_DONE_MODE;
png_push_have_end(png_ptr, info_ptr);
}
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#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
png_ptr->mode |= PNG_HAVE_IDAT;
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png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
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if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
png_ptr->mode |= PNG_HAVE_PLTE;
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else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before IDAT");
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else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
!(png_ptr->mode & PNG_HAVE_PLTE))
png_error(png_ptr, "Missing PLTE before IDAT");
}
}
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#endif
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else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
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{
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if (png_ptr->push_length + 4 > png_ptr->buffer_size)
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{
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png_push_save_buffer(png_ptr);
return;
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}
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png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length);
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}
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else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
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{
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/* If we reach an IDAT chunk, this means we have read all of the
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* header chunks, and we can start reading the image (or if this
* is called after the image has been read - we have an error).
*/
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if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before IDAT");
else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
!(png_ptr->mode & PNG_HAVE_PLTE))
png_error(png_ptr, "Missing PLTE before IDAT");
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if (png_ptr->mode & PNG_HAVE_IDAT)
{
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if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
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if (png_ptr->push_length == 0)
return;
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if (png_ptr->mode & PNG_AFTER_IDAT)
png_error(png_ptr, "Too many IDAT's found");
}
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png_ptr->idat_size = png_ptr->push_length;
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png_ptr->mode |= PNG_HAVE_IDAT;
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png_ptr->process_mode = PNG_READ_IDAT_MODE;
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png_push_have_info(png_ptr, info_ptr);
png_ptr->zstream.avail_out =
(uInt) PNG_ROWBYTES(png_ptr->pixel_depth,
png_ptr->iwidth) + 1;
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png_ptr->zstream.next_out = png_ptr->row_buf;
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return;
}
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#ifdef PNG_READ_gAMA_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
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{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length);
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}
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#endif
#ifdef PNG_READ_sBIT_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
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{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length);
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}
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#endif
#ifdef PNG_READ_cHRM_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
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{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length);
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}
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#endif
#ifdef PNG_READ_sRGB_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
}
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#endif
#ifdef PNG_READ_iCCP_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
}
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#endif
#ifdef PNG_READ_sPLT_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
}
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#endif
#ifdef PNG_READ_tRNS_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
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{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length);
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}
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#endif
#ifdef PNG_READ_bKGD_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
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{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length);
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}
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#endif
#ifdef PNG_READ_hIST_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
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{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length);
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}
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#endif
#ifdef PNG_READ_pHYs_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
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{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length);
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}
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#endif
#ifdef PNG_READ_oFFs_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
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{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length);
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}
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#endif
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#ifdef PNG_READ_pCAL_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
}
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#endif
#ifdef PNG_READ_sCAL_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length);
}
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#endif
#ifdef PNG_READ_tIME_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
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{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length);
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}
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#endif
#ifdef PNG_READ_tEXt_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
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{
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if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length);
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}
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#endif
#ifdef PNG_READ_zTXt_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
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{
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if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length);
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}
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#endif
#ifdef PNG_READ_iTXt_SUPPORTED
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else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
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{
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if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
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png_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
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}
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#endif
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else
{
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if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
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}
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png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
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}
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void /* PRIVATE */
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png_push_crc_skip(png_structp png_ptr, png_uint_32 skip)
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{
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png_ptr->process_mode = PNG_SKIP_MODE;
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png_ptr->skip_length = skip;
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}
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void /* PRIVATE */
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png_push_crc_finish(png_structp png_ptr)
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{
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if (png_ptr->skip_length && png_ptr->save_buffer_size)
{
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png_size_t save_size;
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if (png_ptr->skip_length < (png_uint_32)png_ptr->save_buffer_size)
save_size = (png_size_t)png_ptr->skip_length;
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else
save_size = png_ptr->save_buffer_size;
png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
png_ptr->skip_length -= save_size;
png_ptr->buffer_size -= save_size;
png_ptr->save_buffer_size -= save_size;
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png_ptr->save_buffer_ptr += save_size;
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}
if (png_ptr->skip_length && png_ptr->current_buffer_size)
{
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png_size_t save_size;
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if (png_ptr->skip_length < (png_uint_32)png_ptr->current_buffer_size)
save_size = (png_size_t)png_ptr->skip_length;
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else
save_size = png_ptr->current_buffer_size;
png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
png_ptr->skip_length -= save_size;
png_ptr->buffer_size -= save_size;
png_ptr->current_buffer_size -= save_size;
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png_ptr->current_buffer_ptr += save_size;
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}
if (!png_ptr->skip_length)
{
if (png_ptr->buffer_size < 4)
{
png_push_save_buffer(png_ptr);
return;
}
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png_crc_finish(png_ptr, 0);
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png_ptr->process_mode = PNG_READ_CHUNK_MODE;
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}
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}
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void PNGAPI
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