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Increase padding to 8 zero-bytes

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This commit is contained in:
Dominic Szablewski 2021-12-08 15:29:46 +01:00
parent 947941fbd0
commit 6c83cf2e0c
1 changed files with 7 additions and 4 deletions
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11
qoi.h
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@ -80,7 +80,8 @@ you can define QOI_MALLOC and QOI_FREE before including this library.
-- Data Format -- Data Format
A QOI file has a 14 byte header, followed by any number of data "chunks". A QOI file has a 14 byte header, followed by any number of data "chunks" and 8
zero bytes to mark the end of the data stream.
struct qoi_header_t { struct qoi_header_t {
char magic[4]; // magic bytes "qoif" char magic[4]; // magic bytes "qoif"
@ -196,9 +197,11 @@ are occupied by the QOI_OP_RGB and QOI_OP_RGBA tags.
8-bit alpha channel value 8-bit alpha channel value
The byte stream is padded at the end with 4 zero bytes. Size the longest legal The byte stream is padded at the end with 8 zero bytes. Since the longest legal
chunk is 5 bytes (QOI_OP_RGBA), with this padding it is possible to check for an chunk is 5 bytes (QOI_OP_RGBA), with this padding it is possible to check for an
overrun only once per decode loop iteration. overrun only once per decode loop iteration. These 0x00 bytes also mark the end
of the data stream, as an encoder should never produce 8 consecutive zero bytes
within the stream.
*/ */
@ -314,7 +317,7 @@ void *qoi_decode(const void *data, int size, qoi_desc *desc, int channels);
(((unsigned int)'q') << 24 | ((unsigned int)'o') << 16 | \ (((unsigned int)'q') << 24 | ((unsigned int)'o') << 16 | \
((unsigned int)'i') << 8 | ((unsigned int)'f')) ((unsigned int)'i') << 8 | ((unsigned int)'f'))
#define QOI_HEADER_SIZE 14 #define QOI_HEADER_SIZE 14
#define QOI_PADDING 4 #define QOI_PADDING 8
typedef union { typedef union {
struct { unsigned char r, g, b, a; } rgba; struct { unsigned char r, g, b, a; } rgba;