Leptonica
1.54
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Макросы | |
#define | DEBUG_IHDR 0 |
Функции | |
l_int32 | readHeaderJp2k (const char *filename, l_int32 *pw, l_int32 *ph, l_int32 *pbps, l_int32 *pspp) |
l_int32 | freadHeaderJp2k (FILE *fp, l_int32 *pw, l_int32 *ph, l_int32 *pbps, l_int32 *pspp) |
l_int32 | readHeaderMemJp2k (const l_uint8 *data, size_t size, l_int32 *pw, l_int32 *ph, l_int32 *pbps, l_int32 *pspp) |
l_int32 | fgetJp2kResolution (FILE *fp, l_int32 *pxres, l_int32 *pyres) |
Переменные | |
static const l_int32 | MAX_JP2K_WIDTH = 100000 |
static const l_int32 | MAX_JP2K_HEIGHT = 100000 |
#define DEBUG_IHDR 0 |
l_int32 fgetJp2kResolution | ( | FILE * | fp, |
l_int32 * | pxres, | ||
l_int32 * | pyres | ||
) |
Input: stream opened for read &w (<optional return>="">) &h (<optional return>="">) &bps (<optional return>="">, bits/sample) &spp (<optional return>="">, samples/pixel) Return: 0 if OK, 1 on error
l_int32 readHeaderJp2k | ( | const char * | filename, |
l_int32 * | pw, | ||
l_int32 * | ph, | ||
l_int32 * | pbps, | ||
l_int32 * | pspp | ||
) |
Input: filename &w (<optional return>="">) &h (<optional return>="">) &bps (<optional return>="">, bits/sample) &spp (<optional return>="">, samples/pixel) Return: 0 if OK, 1 on error
l_int32 readHeaderMemJp2k | ( | const l_uint8 * | data, |
size_t | size, | ||
l_int32 * | pw, | ||
l_int32 * | ph, | ||
l_int32 * | pbps, | ||
l_int32 * | pspp | ||
) |
Input: data size (at least 80) &w (<optional return>="">) &h (<optional return>="">) &bps (<optional return>="">, bits/sample) &spp (<optional return>="">, samples/pixel) Return: 0 if OK, 1 on error
Notes: (1) The ISO/IEC reference for jpeg2000 is http://www.jpeg.org/public/15444-1annexi.pdf and the file format syntax begins at page 127. (2) The Image Header Box begins with 'ihdr' = 0x69686472 in big-endian order. This typically, but not always, starts byte 44, with the big-endian data fields beginning at byte 48: h: 4 bytes w: 4 bytes spp: 2 bytes bps: 1 byte (contains bps - 1)
const l_int32 MAX_JP2K_HEIGHT = 100000 [static] |
const l_int32 MAX_JP2K_WIDTH = 100000 [static] |