* Decompress trailing data in a chunk. The assumption is that chunkdata * points at an allocated area holding the contents of a chunk with a * trai

This function frees the memory associated with a single info struct. * Normally, one would use either png_destroy_read_struct() or * png_destroy_wri

Easy access to info, added in libpng-0.99 */

This function returns a pointer to the io_ptr associated with the user * functions. The application should free any memory associated with this * p

Read and check the IDHR chunk */

Read and check the palette */

Read the pCAL chunk (described in the PNG Extensions document) */

Read the sCAL chunk */

This function is called when we haven't found a handler for a chunk. If there isn't a problem with the chunk itself (ie bad chunk name, CRC, or

This is an internal routine to free any memory that the info struct is * pointing to before re-using it or freeing the struct itself. Recall * that

Read the chunk header (length + type name). * Put the type name into png_ptr->chunk_name, and return the length. */

Read the entire image. If the image has an alpha channel or a tRNS * chunk, and you have called png_handle_alpha()[*], you will need to * initializ

Add a filler byte on read, or remove a filler or alpha byte on write. * The filler type has changed in v0.95 to allow future 2-byte fillers * for 48

This function allows the application to supply a new input function * for libpng if standard C streams aren't being used. * * This function takes a

Compress given text into storage in the png_ptr structure */

Ship the compressed text out via chunk writes */

Write the image. You only need to call this function once, even * if you are writing an interlaced image. */

Write a tEXt chunk */

=========================================================================== * Send a stored block */

========================================================================= */

=========================================================================== * Flush the bit buffer, keeping at most 7 bits in it. */

=========================================================================== * Reverse the first len bits of a code, using straightforward code (a fas

=========================================================================== * Flush the bit buffer and align the output on a byte boundary */