Sets length and name and allocates the space for data and crc but does not set data or crc yet. Returns the start of the chunk in chunk. The start of

does not check memory out of bounds, do not use on untrusted data */

buffer must have at least 4 allocated bytes available*/

LSB of value is written first, and LSB of bytes is used first */

Must have enough bits available with ensureBits */

Safely check if adding two integers will overflow (no undefined behavior, compiler removing the code, etc...) and output result. */

Paeth predictor, used by PNG filter type 4 The parameters are of type short, but should come from unsigned chars, the shorts are only needed to make t

in an idat chunk, each scanline is a multiple of 8 bits, unlike the lodepng output buffer, and in addition has one extra byte per line: the filter byt

calculate bits per pixel out of colortype and bitdepth*/

NOTE: when realloc returns NULL, it leaves the original memory untouched */

returns 1 if success, 0 if failure ==> nothing done*/

free string pointer and set it to NULL*/

TODO: make this faster */

This one is to use for adding huffman symbol, the value bits are written MSB first */

compress using the default or custom zlib function */

given the code lengths (as stored in the PNG file), generate the tree as defined by Deflate. maxbitlen is the maximum bits that a code in the tree can

dynamically allocates a new string with a copy of the null terminated input text */

creates a new chain node with the given parameters, from the memory in the lists */

Safely check if multiplying two integers will overflow (no undefined behavior, compiler removing the code, etc...) and output result. */

expected_size is expected output size, to avoid intermediate allocations. Set to 0 if not known. */

Outputs various dimensions and positions in the image related to the Adam7 reduced images. passw: output containing the width of the 7 passes passh: o

Must have enough bits available with ensureBits */

Get RGBA16 color of pixel with index i (y * width + x) from the raw image with given color type, but the given color type must be 16-bit itself.*/

like lodepng_chunk_create but with custom allocsize */

Create the Huffman tree given the symbol frequencies*/

also appends null termination character*/

checks if the colortype is valid and the bitdepth bd is allowed for this colortype. Return value is a LodePNG error code.*/

color is not allowed to already exist. Index should be >= 0 (it's signed to be compatible with using -1 for "doesn't exist") Returns error code, or 0

See ensureBits documentation above. This one ensures up to 25 bits */

See ensureBits documentation above. This one ensures up to 9 bits */

Get RGBA8 color of pixel with index i (y * width + x) from the raw image with given color type.*/

returns the code. The bit reader must already have been ensured at least 15 bits */

Return the CRC of the bytes buf[0..len-1].*/

Get bits without advancing the bit pointer. Must have enough bits available with ensureBits. Max nbits is 31. */

returns 1 if success, 0 if failure ==> nothing done*/

returns 1 if success, 0 if failure ==> nothing done*/

Second step for the ...makeFromLengths and ...makeFromFrequencies functions. numcodes, lengths and maxbitlen must already be filled in correctly. retu

data size argument is in bytes. Returns error if size too large causing overflow */

only adds the chunk if needed (there is a key or palette with alpha) */

index: bitgroup index, bits: bitgroup size(1, 2 or 4), in: bitgroup value, out: octet array to add bits to*/

Return the adler32 of the bytes data[0..len-1]*/