jof_png_internal.h

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#pragma once
 
#include <stddef.h>
#include <stdint.h>
 
#include "jof_internal.h"
#include "miniz.h"
#include "ra8_attributes.h"
#include "ra8_err.h"

typedef enum : uint32_t {
  k_ra8_png_sig_bytes   = 8U,          
  k_ra8_png_chunk_hdr   = 8U,          
  k_ra8_png_crc_bytes   = 4U,          
  k_ra8_png_ihdr_len    = 13U,         
  k_ra8_png_max_chunks  = 4096U,       
  k_ra8_png_max_len     = 0x7FFFFFFFU, 
  k_ra8_png_ring_bytes  = 65536U,      
  k_ra8_png_inbuf_bytes = 4096U,       
  k_ra8_png_plte_max    = 768U,        
  k_ra8_png_trns_max    = 256U,        
  k_ra8_png_skip_chunk  = 256U,        
  k_ra8_png_type_ihdr   = 0x49484452U, 
  k_ra8_png_type_plte   = 0x504C5445U, 
  k_ra8_png_type_idat   = 0x49444154U, 
  k_ra8_png_type_iend   = 0x49454E44U, 
  k_ra8_png_type_trns   = 0x74524E53U, 
} ra8_png_const_t;

typedef enum : uint8_t {
  k_ra8_png_sig_high = 0x89U, 
  k_ra8_png_sig_cr   = 0x0DU, 
  k_ra8_png_sig_lf   = 0x0AU, 
  k_ra8_png_sig_sub  = 0x1AU, 
} ra8_png_signature_t;

typedef enum : uint8_t {
  k_ra8_png_ihdr_ofs_depth     = 8U,   
  k_ra8_png_ihdr_ofs_color     = 9U,   
  k_ra8_png_ihdr_ofs_compress  = 10U,  
  k_ra8_png_ihdr_ofs_filter    = 11U,  
  k_ra8_png_ihdr_ofs_interlace = 12U,  
  k_ra8_png_depth_8            = 8U,   
  k_ra8_png_color_gray         = 0U,   
  k_ra8_png_color_rgb          = 2U,   
  k_ra8_png_color_pal          = 3U,   
  k_ra8_png_color_ga           = 4U,   
  k_ra8_png_color_rgba         = 6U,   
  k_ra8_png_filter_none        = 0U,   
  k_ra8_png_filter_sub         = 1U,   
  k_ra8_png_filter_up          = 2U,   
  k_ra8_png_filter_avg         = 3U,   
  k_ra8_png_filter_paeth       = 4U,   
  k_ra8_png_ch_1               = 1U,   
  k_ra8_png_ch_2               = 2U,   
  k_ra8_png_ch_3               = 3U,   
  k_ra8_png_ch_4               = 4U,   
  k_ra8_png_be_sh24            = 24U,  
  k_ra8_png_be_sh16            = 16U,  
  k_ra8_png_be_sh8             = 8U,   
  k_ra8_png_opaque             = 255U, 
} ra8_png_field_t;

typedef struct {
  jof_pull_fn pull;     
  void*       pull_ctx; 
  jof_geom_fn on_geom;  
  jof_rows_fn on_rows;  
  void*       cb_ctx;   
 
  uint16_t w;          
  uint16_t h;          
  uint8_t  color_type; 
  uint8_t  src_ch;     
  uint8_t  dst_ch;     
 
  uint8_t  palette[k_ra8_png_plte_max]; 
  uint8_t  trns[k_ra8_png_trns_max];    
  uint16_t plte_count;                  
  uint16_t trns_count;                  
  uint8_t  has_plte;                    
  uint8_t  has_trns;                    
 
  tinfl_decompressor* inflator; 
  uint8_t*            ring;     
  uint8_t*            inbuf;    
  uint8_t*            rowbuf;   
  uint8_t*            prevrow;  
  uint8_t*            xlat;     
 
  uint32_t ring_wr;   
  uint32_t rowlen;    
  uint32_t rowfill;   
  uint16_t rows_done; 
 
  uint32_t idat_rem;      
  uint8_t  source_done;   
  uint8_t  pending_valid; 
  uint32_t pending_len;   
  uint32_t pending_type;  
} ra8_png_state_t;
 
/* ---------------------------------------------------------------------------
 * Chunk-layer primitives (defined in jof_png_chunk.c, driven by
 * the pixel layer in jof_png.c).
 * ---------------------------------------------------------------------------
 */

RA8_PRIV ra8_err_t priv_jof_png_pull_exact(ra8_png_state_t* st, uint8_t* buf, uint32_t len);

RA8_PRIV ra8_err_t priv_jof_png_skip(ra8_png_state_t* st, uint32_t len);

RA8_PRIV ra8_err_t priv_jof_png_chunk_hdr(ra8_png_state_t* st,
                                          uint32_t*        out_len,
                                          uint32_t*        out_type);

RA8_PRIV ra8_err_t priv_jof_png_prologue(ra8_png_state_t* st, uint16_t max_w, uint16_t max_h);

RA8_PRIV ra8_err_t priv_jof_png_pre_idat(ra8_png_state_t* st, uint32_t len, uint32_t type);

RA8_PRIV ra8_err_t priv_jof_png_finish(ra8_png_state_t* st);