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Read user chunks

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This commit is contained in:
Jaime Passos 2019-09-11 20:18:04 -03:00
parent affff0a7e5
commit a5ff609873
4 changed files with 59 additions and 33 deletions
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1
libs/libpng-src/pngconf.h
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@ -62,7 +62,6 @@
#define PNG_NO_READ_iTXt
#define PNG_NO_READ_APNG
#define PNG_NO_READ_UNKNOWN_CHUNKS
#define PNG_NO_READ_USER_TRANSFORM
#define PNG_READ_BGR_SUPPORTED
#define PNG_NO_READ_SWAP_ALPHA

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libs/libpng-src/projects/libpng32.a
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libs/libpng-src/projects/libpng64.a
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69
src/r_data.c
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@ -2603,17 +2603,40 @@ typedef struct {
png_bytep buffer;
png_uint_32 bufsize;
png_uint_32 current_pos;
} png_ioread;
} png_io_t;
static void PNG_IOReader(png_structp png_ptr, png_bytep data, png_size_t length)
{
png_ioread *f = png_get_io_ptr(png_ptr);
png_io_t *f = png_get_io_ptr(png_ptr);
if (length > (f->bufsize - f->current_pos))
png_error(png_ptr, "PNG_IOReader: buffer overrun");
memcpy(data, f->buffer + f->current_pos, length);
f->current_pos += length;
}
typedef struct
{
char name[4];
void *data;
size_t size;
} png_chunk_t;
static png_byte *chunkname = NULL;
static png_chunk_t chunk;
static int PNG_ChunkReader(png_structp png_ptr, png_unknown_chunkp chonk)
{
if (!memcmp(chonk->name, chunkname, 4))
{
memcpy(chunk.name, chonk->name, 4);
chunk.size = chonk->size;
chunk.data = Z_Malloc(chunk.size, PU_STATIC, NULL);
memcpy(chunk.data, chonk->data, chunk.size);
return 1;
}
return 0;
}
static void PNG_error(png_structp PNG, png_const_charp pngtext)
{
CONS_Debug(DBG_RENDER, "libpng error at %p: %s", PNG, pngtext);
@ -2638,11 +2661,13 @@ static png_bytep *PNG_Read(UINT8 *png, UINT16 *w, UINT16 *h, INT16 *topoffset, I
#endif
#endif
png_ioread png_io;
png_io_t png_io;
png_bytep *row_pointers;
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL,
PNG_error, PNG_warn);
png_byte grAb_chunk[5] = {'g', 'r', 'A', 'b', (png_byte)'\0'};
png_voidp *user_chunk_ptr;
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, PNG_error, PNG_warn);
if (!png_ptr)
{
CONS_Debug(DBG_RENDER, "PNG_Load: Error on initialize libpng\n");
@ -2677,12 +2702,18 @@ static png_bytep *PNG_Read(UINT8 *png, UINT16 *w, UINT16 *h, INT16 *topoffset, I
png_io.current_pos = 0;
png_set_read_fn(png_ptr, &png_io, PNG_IOReader);
memset(&chunk, 0x00, sizeof(png_chunk_t));
chunkname = grAb_chunk; // I want to read a grAb chunk
user_chunk_ptr = png_get_user_chunk_ptr(png_ptr);
png_set_read_user_chunk_fn(png_ptr, user_chunk_ptr, PNG_ChunkReader);
png_set_keep_unknown_chunks(png_ptr, 2, chunkname, 1);
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
png_set_user_limits(png_ptr, 2048, 2048);
#endif
png_read_info(png_ptr, png_info_ptr);
png_get_IHDR(png_ptr, png_info_ptr, &width, &height, &bit_depth, &color_type, NULL, NULL, NULL);
if (bit_depth == 16)
@ -2715,35 +2746,31 @@ static png_bytep *PNG_Read(UINT8 *png, UINT16 *w, UINT16 *h, INT16 *topoffset, I
// Read grAB chunk
if (topoffset || leftoffset)
{
UINT8 *header = png;
while (size--)
{
if (!memcmp(header, "grAb", 4))
{
INT32 *offsets = (INT32 *)chunk.data;
// The grAb chunk stores offsets as big-endian numbers.
#ifdef SRB2_BIG_ENDIAN
#define ENDIANESS(x) (x)
#else
#define ENDIANESS(x) ((x>>24)&0xff)|((x<<8)&0xff0000)|((x>>8)&0xff00)|((x<<24)&0xff000000)
#endif
// skip name
header += 4;
// read left offset
if (leftoffset != NULL)
*leftoffset = (INT16)ENDIANESS(*(INT32 *)header);
*leftoffset = (INT16)ENDIANESS(*offsets);
offsets++;
// read top offset
header += 4;
if (topoffset != NULL)
*topoffset = (INT16)ENDIANESS(*(INT32 *)header);
*topoffset = (INT16)ENDIANESS(*offsets);
#undef ENDIANESS
break;
}
header++;
}
}
// bye
png_destroy_read_struct(&png_ptr, &png_info_ptr, NULL);
if (chunk.data)
Z_Free(chunk.data);
*w = (INT32)width;
*h = (INT32)height;
@ -2920,7 +2947,7 @@ boolean R_PNGDimensions(UINT8 *png, INT16 *width, INT16 *height, size_t size)
#endif
#endif
png_ioread png_io;
png_io_t png_io;
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL,
PNG_error, PNG_warn);