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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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*
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* libpng 1.0.1
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* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
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* Copyright (c) 1998, Glenn Randers-Pehrson
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* March 9, 1998
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*/
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#define PNG_INTERNAL
#include "png.h"
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#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
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void
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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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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
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png_process_some_data(png_structp png_ptr, png_infop info_ptr)
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{
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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;
}
case PNG_READ_CHUNK_MODE:
{
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png_push_read_chunk(png_ptr, info_ptr);
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break;
}
case PNG_READ_IDAT_MODE:
{
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png_push_read_IDAT(png_ptr);
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break;
}
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#if defined(PNG_READ_tEXt_SUPPORTED)
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case PNG_READ_tEXt_MODE:
{
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png_push_read_tEXt(png_ptr, info_ptr);
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break;
}
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#endif
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#if defined(PNG_READ_zTXt_SUPPORTED)
case PNG_READ_zTXt_MODE:
{
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png_push_read_zTXt(png_ptr, info_ptr);
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break;
}
#endif
case PNG_SKIP_MODE:
{
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png_push_crc_finish(png_ptr);
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break;
}
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
* with bytes already read from the signature, whether because they have been
* checked by the calling application, or from multiple calls to this routine.
*/
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void
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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 += 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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}
void
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png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
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{
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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->flags & PNG_FLAG_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);
png_ptr->push_length = png_get_uint_32(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_ptr->flags |= PNG_FLAG_HAVE_CHUNK_HEADER;
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}
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if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 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_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_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_IDAT)
{
if (png_ptr->push_length == 0)
return;
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_ptr->irowbytes;
png_ptr->zstream.next_out = png_ptr->row_buf;
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return;
}
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else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 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;
}
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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}
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#if defined(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
#if defined(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
#if defined(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
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#if defined(PNG_READ_sRGB_SUPPORTED)
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;
}
png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
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#if defined(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
#if defined(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
#if defined(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
#if defined(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
#if defined(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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#if defined(PNG_READ_pCAL_SUPPORTED)
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;
}
png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
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#if defined(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
#if defined(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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png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length);
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}
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#endif
#if defined(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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png_push_handle_zTXt(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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png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
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}
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png_ptr->flags &= ~PNG_FLAG_HAVE_CHUNK_HEADER;
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}
void
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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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}
void
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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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}
void
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png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
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{
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png_bytep ptr;
ptr = buffer;
if (png_ptr->save_buffer_size)
{
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png_size_t save_size;
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if (length < png_ptr->save_buffer_size)
save_size = length;
else
save_size = png_ptr->save_buffer_size;
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png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size);
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length -= save_size;
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ptr += save_size;
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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 (length && png_ptr->current_buffer_size)
{
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png_size_t save_size;
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if (length < png_ptr->current_buffer_size)
save_size = length;
else
save_size = png_ptr->current_buffer_size;
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png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size);
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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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}
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}
void
png_push_save_buffer(png_structp png_ptr)
{
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if (png_ptr->save_buffer_size)
{
if (png_ptr->save_buffer_ptr != png_ptr->save_buffer)
{
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png_size_t i;
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png_bytep sp;
png_bytep dp;
for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer;
i < png_ptr->save_buffer_size;
i++, sp++, dp++)
{
*dp = *sp;
}
}
}
if (png_ptr->save_buffer_size + png_ptr->current_buffer_size >
png_ptr->save_buffer_max)
{
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png_size_t new_max;
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png_bytep old_buffer;
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new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
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old_buffer = png_ptr->save_buffer;
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png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr,
(png_uint_32)new_max);
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png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size);
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png_free(png_ptr, old_buffer);
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png_ptr->save_buffer_max = new_max;
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}
if (png_ptr->current_buffer_size)
{
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png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size,
png_ptr->current_buffer_ptr, png_ptr->current_buffer_size);
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png_ptr->save_buffer_size += png_ptr->current_buffer_size;
png_ptr->current_buffer_size = 0;
}
png_ptr->save_buffer_ptr = png_ptr->save_buffer;
png_ptr->buffer_size = 0;
1995-12-19 09:22:19 +00:00
}
void
png_push_restore_buffer(png_structp png_ptr, png_bytep buffer,
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png_size_t buffer_length)
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{
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png_ptr->current_buffer = buffer;
png_ptr->current_buffer_size = buffer_length;
png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size;
png_ptr->current_buffer_ptr = png_ptr->current_buffer;
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}
void
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png_push_read_IDAT(png_structp png_ptr)
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{
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if (!(png_ptr->flags & PNG_FLAG_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);
png_ptr->push_length = png_get_uint_32(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_ptr->flags |= PNG_FLAG_HAVE_CHUNK_HEADER;
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
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{
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png_ptr->process_mode = PNG_READ_CHUNK_MODE;
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if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
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png_error(png_ptr, "Not enough compressed data");
return;
}
png_ptr->idat_size = png_ptr->push_length;
}
if (png_ptr->idat_size && png_ptr->save_buffer_size)
{
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png_size_t save_size;
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1997-05-16 07:46:07 +00:00
if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size)
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{
save_size = (png_size_t)png_ptr->idat_size;
/* check for overflow */
if((png_uint_32)save_size != png_ptr->idat_size)
png_error(png_ptr, "save_size overflowed in pngpread");
}
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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_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
png_ptr->idat_size -= 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->idat_size && png_ptr->current_buffer_size)
{
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png_size_t save_size;
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1997-05-16 07:46:07 +00:00
if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size)
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{
save_size = (png_size_t)png_ptr->idat_size;
/* check for overflow */
if((png_uint_32)save_size != png_ptr->idat_size)
png_error(png_ptr, "save_size overflowed in pngpread");
}
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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_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size);
png_ptr->idat_size -= 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->idat_size)
{
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->flags &= ~PNG_FLAG_HAVE_CHUNK_HEADER;
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}
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}
void
png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
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png_size_t buffer_length)
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{
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int ret;
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if ((png_ptr->flags & PNG_FLAG_ZLIB_FINISHED) && buffer_length)
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png_error(png_ptr, "Extra compression data");
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png_ptr->zstream.next_in = buffer;
png_ptr->zstream.avail_in = (uInt)buffer_length;
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for(;;)
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{
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ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
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if (ret == Z_STREAM_END)
{
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if (png_ptr->zstream.avail_in)
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png_error(png_ptr, "Extra compressed data");
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if (!(png_ptr->zstream.avail_out))
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{
png_push_process_row(png_ptr);
}
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png_ptr->mode |= PNG_AFTER_IDAT;
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png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
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break;
}
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else if (ret == Z_BUF_ERROR)
break;
else if (ret != Z_OK)
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png_error(png_ptr, "Decompression Error");
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if (!(png_ptr->zstream.avail_out))
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{
png_push_process_row(png_ptr);
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png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
png_ptr->zstream.next_out = png_ptr->row_buf;
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}
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else
break;
}
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}
void
png_push_process_row(png_structp png_ptr)
{
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png_ptr->row_info.color_type = png_ptr->color_type;
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png_ptr->row_info.width = png_ptr->iwidth;
png_ptr->row_info.channels = png_ptr->channels;
png_ptr->row_info.bit_depth = png_ptr->bit_depth;
png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
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1995-12-19 09:22:19 +00:00
png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
(png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
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png_read_filter_row(png_ptr, &(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->prev_row + 1,
(int)(png_ptr->row_buf[0]));
1995-12-19 09:22:19 +00:00
1998-02-09 02:56:40 +00:00
png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
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png_ptr->rowbytes + 1);
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if (png_ptr->transformations)
png_do_read_transformations(png_ptr);
#if defined(PNG_READ_INTERLACING_SUPPORTED)
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/* blow up interlaced rows to full size */
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if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
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{
if (png_ptr->pass < 6)
png_do_read_interlace(&(png_ptr->row_info),
1997-05-16 07:46:07 +00:00
png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
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switch (png_ptr->pass)
{
case 0:
{
int i;
for (i = 0; i < 8 && png_ptr->pass == 0; i++)
{
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
}
break;
}
case 1:
{
int i;
for (i = 0; i < 8 && png_ptr->pass == 1; i++)
{
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
}
if (png_ptr->pass == 2)
{
for (i = 0; i < 4 && png_ptr->pass == 2; i++)
{
png_push_have_row(png_ptr, NULL);
png_read_push_finish_row(png_ptr);
}
}
break;
}
case 2:
{
int i;
for (i = 0; i < 4 && png_ptr->pass == 2; i++)
{
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
}
for (i = 0; i < 4 && png_ptr->pass == 2; i++)
{
png_push_have_row(png_ptr, NULL);
png_read_push_finish_row(png_ptr);
}
break;
}
case 3:
{
int i;
for (i = 0; i < 4 && png_ptr->pass == 3; i++)
{
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
}
if (png_ptr->pass == 4)
{
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
{
png_push_have_row(png_ptr, NULL);
png_read_push_finish_row(png_ptr);
}
}
break;
}
case 4:
{
int i;
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
{
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
}
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
{
png_push_have_row(png_ptr, NULL);
png_read_push_finish_row(png_ptr);
}
break;
}
case 5:
{
int i;
for (i = 0; i < 2 && png_ptr->pass == 5; i++)
{
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
}
if (png_ptr->pass == 6)
{
png_push_have_row(png_ptr, NULL);
png_read_push_finish_row(png_ptr);
}
break;
}
case 6:
{
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
if (png_ptr->pass != 6)
break;
png_push_have_row(png_ptr, NULL);
png_read_push_finish_row(png_ptr);
}
}
}
else
1995-12-19 09:22:19 +00:00
#endif
1996-01-26 07:38:47 +00:00
{
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
}
1995-12-19 09:22:19 +00:00
}
void
png_read_push_finish_row(png_structp png_ptr)
{
png_ptr->row_number++;
if (png_ptr->row_number < png_ptr->num_rows)
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return;
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if (png_ptr->interlaced)
{
png_ptr->row_number = 0;
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png_memset_check(png_ptr, png_ptr->prev_row, 0,
png_ptr->rowbytes + 1);
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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];
1998-03-07 12:06:55 +00:00
png_ptr->irowbytes = ((png_ptr->iwidth *
png_ptr->pixel_depth + 7) >> 3) + 1;
1995-12-19 09:22:19 +00:00
if (!(png_ptr->transformations & PNG_INTERLACE))
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{
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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];
if (!(png_ptr->num_rows))
continue;
}
if (png_ptr->transformations & PNG_INTERLACE)
break;
} while (png_ptr->iwidth == 0);
}
}
#if defined(PNG_READ_tEXt_SUPPORTED)
void
1997-01-17 07:34:35 +00:00
png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
1995-12-19 09:22:19 +00:00
{
1997-01-17 07:34:35 +00:00
if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND)
1998-02-09 02:56:40 +00:00
{
png_error(png_ptr, "Out of place tEXt");
/* to quiet some compiler warnings */
if(info_ptr == NULL) return;
}
1997-01-17 07:34:35 +00:00
1997-05-16 07:46:07 +00:00
#ifdef PNG_MAX_MALLOC_64K
png_ptr->skip_length = 0; /* This may not be necessary */
1998-01-01 13:13:13 +00:00
if (length > (png_uint_32)65535L) /* Can't hold the entire string in memory */
1997-05-16 07:46:07 +00:00
{
png_warning(png_ptr, "tEXt chunk too large to fit in memory");
1998-01-01 13:13:13 +00:00
png_ptr->skip_length = length - (png_uint_32)65535L;
length = (png_uint_32)65535L;
1997-05-16 07:46:07 +00:00
}
#endif
1998-02-07 16:20:57 +00:00
png_ptr->current_text = (png_charp)png_malloc(png_ptr,
(png_uint_32)(length+1));
1997-05-16 07:46:07 +00:00
png_ptr->current_text[length] = '\0';
1996-01-26 07:38:47 +00:00
png_ptr->current_text_ptr = png_ptr->current_text;
1998-02-07 16:20:57 +00:00
png_ptr->current_text_size = (png_size_t)length;
png_ptr->current_text_left = (png_size_t)length;
1996-01-26 07:38:47 +00:00
png_ptr->process_mode = PNG_READ_tEXt_MODE;
1995-12-19 09:22:19 +00:00
}
void
1997-01-17 07:34:35 +00:00
png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
1995-12-19 09:22:19 +00:00
{
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if (png_ptr->buffer_size && png_ptr->current_text_left)
{
1997-05-16 07:46:07 +00:00
png_size_t text_size;
1996-01-26 07:38:47 +00:00
if (png_ptr->buffer_size < png_ptr->current_text_left)
text_size = png_ptr->buffer_size;
else
text_size = png_ptr->current_text_left;
1997-05-16 07:46:07 +00:00
png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
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png_ptr->current_text_left -= text_size;
1997-05-16 07:46:07 +00:00
png_ptr->current_text_ptr += text_size;
1996-01-26 07:38:47 +00:00
}
if (!(png_ptr->current_text_left))
{
1997-05-16 07:46:07 +00:00
png_textp text_ptr;
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png_charp text;
png_charp key;
if (png_ptr->buffer_size < 4)
{
png_push_save_buffer(png_ptr);
return;
}
1997-05-16 07:46:07 +00:00
png_push_crc_finish(png_ptr);
#if defined(PNG_MAX_MALLOC_64K)
if (png_ptr->skip_length)
return;
#endif
1996-01-26 07:38:47 +00:00
key = png_ptr->current_text;
png_ptr->current_text = 0;
for (text = key; *text; text++)
/* empty loop */ ;
1997-05-16 07:46:07 +00:00
if (text != key + png_ptr->current_text_size)
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text++;
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text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
1997-05-16 07:46:07 +00:00
text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
text_ptr->key = key;
text_ptr->text = text;
1996-01-26 07:38:47 +00:00
1997-05-16 07:46:07 +00:00
png_set_text(png_ptr, info_ptr, text_ptr, 1);
png_free(png_ptr, text_ptr);
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}
1995-12-19 09:22:19 +00:00
}
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
void
1997-01-17 07:34:35 +00:00
png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
1995-12-19 09:22:19 +00:00
{
1997-01-17 07:34:35 +00:00
if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND)
1998-02-09 02:56:40 +00:00
{
png_error(png_ptr, "Out of place zTXt");
/* to quiet some compiler warnings */
if(info_ptr == NULL) return;
}
1997-01-17 07:34:35 +00:00
1997-05-16 07:46:07 +00:00
#ifdef PNG_MAX_MALLOC_64K
/* We can't handle zTXt chunks > 64K, since we don't have enough space
* to be able to store the uncompressed data. Actually, the threshold
* is probably around 32K, but it isn't as definite as 64K is.
*/
1998-01-01 13:13:13 +00:00
if (length > (png_uint_32)65535L)
1997-05-16 07:46:07 +00:00
{
png_warning(png_ptr, "zTXt chunk too large to fit in memory");
png_push_crc_skip(png_ptr, length);
return;
}
#endif
1998-02-07 16:20:57 +00:00
png_ptr->current_text = (png_charp)png_malloc(png_ptr,
(png_uint_32)(length+1));
1997-05-16 07:46:07 +00:00
png_ptr->current_text[length] = '\0';
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png_ptr->current_text_ptr = png_ptr->current_text;
1998-02-07 16:20:57 +00:00
png_ptr->current_text_size = (png_size_t)length;
png_ptr->current_text_left = (png_size_t)length;
1996-01-26 07:38:47 +00:00
png_ptr->process_mode = PNG_READ_zTXt_MODE;
1995-12-19 09:22:19 +00:00
}
void
1997-01-17 07:34:35 +00:00
png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
1995-12-19 09:22:19 +00:00
{
1996-01-26 07:38:47 +00:00
if (png_ptr->buffer_size && png_ptr->current_text_left)
{
1997-05-16 07:46:07 +00:00
png_size_t text_size;
1996-01-26 07:38:47 +00:00
1997-05-16 07:46:07 +00:00
if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left)
1996-01-26 07:38:47 +00:00
text_size = png_ptr->buffer_size;
else
text_size = png_ptr->current_text_left;
1997-05-16 07:46:07 +00:00
png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
1996-01-26 07:38:47 +00:00
png_ptr->current_text_left -= text_size;
1997-05-16 07:46:07 +00:00
png_ptr->current_text_ptr += text_size;
1996-01-26 07:38:47 +00:00
}
if (!(png_ptr->current_text_left))
{
1997-05-16 07:46:07 +00:00
png_textp text_ptr;
1996-01-26 07:38:47 +00:00
png_charp text;
png_charp key;
int ret;
1997-05-16 07:46:07 +00:00
png_size_t text_size, key_size;
1996-01-26 07:38:47 +00:00
if (png_ptr->buffer_size < 4)
{
png_push_save_buffer(png_ptr);
return;
}
1997-05-16 07:46:07 +00:00
png_push_crc_finish(png_ptr);
1996-01-26 07:38:47 +00:00
key = png_ptr->current_text;
png_ptr->current_text = 0;
for (text = key; *text; text++)
/* empty loop */ ;
/* zTXt can't have zero text */
1997-05-16 07:46:07 +00:00
if (text == key + png_ptr->current_text_size)
1996-01-26 07:38:47 +00:00
{
1997-01-17 07:34:35 +00:00
png_free(png_ptr, key);
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return;
}
text++;
1997-05-16 07:46:07 +00:00
if (*text != PNG_TEXT_COMPRESSION_zTXt) /* check compression byte */
1996-01-26 07:38:47 +00:00
{
1997-01-17 07:34:35 +00:00
png_free(png_ptr, key);
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return;
}
text++;
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png_ptr->zstream.next_in = (png_bytep )text;
png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size -
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(text - key));
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png_ptr->zstream.next_out = png_ptr->zbuf;
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png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
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key_size = text - key;
text_size = 0;
text = NULL;
ret = Z_STREAM_END;
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while (png_ptr->zstream.avail_in)
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{
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ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
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if (ret != Z_OK && ret != Z_STREAM_END)
{
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inflateReset(&png_ptr->zstream);
png_ptr->zstream.avail_in = 0;
png_free(png_ptr, key);
png_free(png_ptr, text);
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return;
}
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if (!(png_ptr->zstream.avail_out) || ret == Z_STREAM_END)
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{
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if (text == NULL)
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{
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text = (png_charp)png_malloc(png_ptr,
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(png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out +
key_size + 1));
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png_memcpy(text + key_size, png_ptr->zbuf,
png_ptr->zbuf_size - png_ptr->zstream.avail_out);
png_memcpy(text, key, key_size);
text_size = key_size + png_ptr->zbuf_size -
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png_ptr->zstream.avail_out;
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*(text + text_size) = '\0';
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}
else
{
png_charp tmp;
tmp = text;
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text = (png_charp)png_malloc(png_ptr, text_size +
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(png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out
+ 1));
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png_memcpy(text, tmp, text_size);
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png_free(png_ptr, tmp);
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png_memcpy(text + text_size, png_ptr->zbuf,
png_ptr->zbuf_size - png_ptr->zstream.avail_out);
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text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
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*(text + text_size) = '\0';
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}
if (ret != Z_STREAM_END)
{
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png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
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}
}
else
{
break;
}
if (ret == Z_STREAM_END)
break;
}
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inflateReset(&png_ptr->zstream);
png_ptr->zstream.avail_in = 0;
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if (ret != Z_STREAM_END)
{
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png_free(png_ptr, key);
png_free(png_ptr, text);
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return;
}
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png_free(png_ptr, key);
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key = text;
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text += key_size;
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text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
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text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
text_ptr->key = key;
text_ptr->text = text;
png_set_text(png_ptr, info_ptr, text_ptr, 1);
png_free(png_ptr, text_ptr);
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}
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}
#endif
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/* This function is called when we haven't found a handler for this
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* chunk. In the future we will have code here which can handle
* user-defined callback functions for unknown chunks before they are
* ignored or cause an error. If there isn't a problem with the
* chunk itself (ie a bad chunk name or a critical chunk), the chunk
* is (currently) silently ignored.
*/
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void
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png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_check_chunk_name(png_ptr, png_ptr->chunk_name);
if (!(png_ptr->chunk_name[0] & 0x20))
{
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png_chunk_error(png_ptr, "unknown critical chunk");
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/* to quiet some compiler warnings */
if(info_ptr == NULL) return;
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}
png_push_crc_skip(png_ptr, length);
}
void
png_push_have_info(png_structp png_ptr, png_infop info_ptr)
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{
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if (png_ptr->info_fn != NULL)
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(*(png_ptr->info_fn))(png_ptr, info_ptr);
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}
void
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png_push_have_end(png_structp png_ptr, png_infop info_ptr)
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{
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if (png_ptr->end_fn != NULL)
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(*(png_ptr->end_fn))(png_ptr, info_ptr);
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}
void
png_push_have_row(png_structp png_ptr, png_bytep row)
{
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if (png_ptr->row_fn != NULL)
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(*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number,
(int)png_ptr->pass);
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}
void
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png_progressive_combine_row (png_structp png_ptr,
png_bytep old_row, png_bytep new_row)
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{
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if (new_row != NULL)
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png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
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}
void
png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
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png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
png_progressive_end_ptr end_fn)
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{
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png_ptr->info_fn = info_fn;
png_ptr->row_fn = row_fn;
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png_ptr->end_fn = end_fn;
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png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer);
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}
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png_voidp
png_get_progressive_ptr(png_structp png_ptr)
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{
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return png_ptr->io_ptr;
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}
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#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */