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Diffstat (limited to 'xicc/iccjpeg.c')
-rw-r--r-- | xicc/iccjpeg.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/xicc/iccjpeg.c b/xicc/iccjpeg.c new file mode 100644 index 0000000..13d4e25 --- /dev/null +++ b/xicc/iccjpeg.c @@ -0,0 +1,271 @@ + +/* + +Little CMS +Copyright (c) 1998-2010 Marti Maria Saguer + +Permission is hereby granted, free of charge, to any person obtaining a copy of this software and as +sociated documentation files (the "Software"), to deal in the Software without restriction, includin +g without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or + sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subj +ect to the following conditions: + +The above copyright notice and this permission notice shall be included in all copies or substantial + portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NO +T LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT +. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABI +LITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WIT +H THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + +*/ + +/* + * iccjpeg.c + * + * This file provides code to read and write International Color Consortium + * (ICC) device profiles embedded in JFIF JPEG image files. The ICC has + * defined a standard format for including such data in JPEG "APP2" markers. + * The code given here does not know anything about the internal structure + * of the ICC profile data; it just knows how to put the profile data into + * a JPEG file being written, or get it back out when reading. + * + * This code depends on new features added to the IJG JPEG library as of + * IJG release 6b; it will not compile or work with older IJG versions. + * + * NOTE: this code would need surgery to work on 16-bit-int machines + * with ICC profiles exceeding 64K bytes in size. If you need to do that, + * change all the "unsigned int" variables to "INT32". You'll also need + * to find a malloc() replacement that can allocate more than 64K. + */ + +#include "iccjpeg.h" +#include <stdlib.h> /* define malloc() */ + + +/* + * Since an ICC profile can be larger than the maximum size of a JPEG marker + * (64K), we need provisions to split it into multiple markers. The format + * defined by the ICC specifies one or more APP2 markers containing the + * following data: + * Identifying string ASCII "ICC_PROFILE\0" (12 bytes) + * Marker sequence number 1 for first APP2, 2 for next, etc (1 byte) + * Number of markers Total number of APP2's used (1 byte) + * Profile data (remainder of APP2 data) + * Decoders should use the marker sequence numbers to reassemble the profile, + * rather than assuming that the APP2 markers appear in the correct sequence. + */ + +#define ICC_MARKER (JPEG_APP0 + 2) /* JPEG marker code for ICC */ +#define ICC_OVERHEAD_LEN 14 /* size of non-profile data in APP2 */ +#define MAX_BYTES_IN_MARKER 65533 /* maximum data len of a JPEG marker */ +#define MAX_DATA_BYTES_IN_MARKER (MAX_BYTES_IN_MARKER - ICC_OVERHEAD_LEN) + + +/* + * This routine writes the given ICC profile data into a JPEG file. + * It *must* be called AFTER calling jpeg_start_compress() and BEFORE + * the first call to jpeg_write_scanlines(). + * (This ordering ensures that the APP2 marker(s) will appear after the + * SOI and JFIF or Adobe markers, but before all else.) + */ + +void +write_icc_profile (j_compress_ptr cinfo, + const JOCTET *icc_data_ptr, + unsigned int icc_data_len) +{ + unsigned int num_markers; /* total number of markers we'll write */ + int cur_marker = 1; /* per spec, counting starts at 1 */ + unsigned int length; /* number of bytes to write in this marker */ + + /* Calculate the number of markers we'll need, rounding up of course */ + num_markers = icc_data_len / MAX_DATA_BYTES_IN_MARKER; + if (num_markers * MAX_DATA_BYTES_IN_MARKER != icc_data_len) + num_markers++; + + while (icc_data_len > 0) { + /* length of profile to put in this marker */ + length = icc_data_len; + if (length > MAX_DATA_BYTES_IN_MARKER) + length = MAX_DATA_BYTES_IN_MARKER; + icc_data_len -= length; + + /* Write the JPEG marker header (APP2 code and marker length) */ + jpeg_write_m_header(cinfo, ICC_MARKER, + (unsigned int) (length + ICC_OVERHEAD_LEN)); + + /* Write the marker identifying string "ICC_PROFILE" (null-terminated). + * We code it in this less-than-transparent way so that the code works + * even if the local character set is not ASCII. + */ + jpeg_write_m_byte(cinfo, 0x49); + jpeg_write_m_byte(cinfo, 0x43); + jpeg_write_m_byte(cinfo, 0x43); + jpeg_write_m_byte(cinfo, 0x5F); + jpeg_write_m_byte(cinfo, 0x50); + jpeg_write_m_byte(cinfo, 0x52); + jpeg_write_m_byte(cinfo, 0x4F); + jpeg_write_m_byte(cinfo, 0x46); + jpeg_write_m_byte(cinfo, 0x49); + jpeg_write_m_byte(cinfo, 0x4C); + jpeg_write_m_byte(cinfo, 0x45); + jpeg_write_m_byte(cinfo, 0x0); + + /* Add the sequencing info */ + jpeg_write_m_byte(cinfo, cur_marker); + jpeg_write_m_byte(cinfo, (int) num_markers); + + /* Add the profile data */ + while (length--) { + jpeg_write_m_byte(cinfo, *icc_data_ptr); + icc_data_ptr++; + } + cur_marker++; + } +} + + +/* + * Prepare for reading an ICC profile + */ + +void +setup_read_icc_profile (j_decompress_ptr cinfo) +{ + /* Tell the library to keep any APP2 data it may find */ + jpeg_save_markers(cinfo, ICC_MARKER, 0xFFFF); +} + + +/* + * Handy subroutine to test whether a saved marker is an ICC profile marker. + */ + +static boolean +marker_is_icc (jpeg_saved_marker_ptr marker) +{ + return + marker->marker == ICC_MARKER && + marker->data_length >= ICC_OVERHEAD_LEN && + /* verify the identifying string */ + GETJOCTET(marker->data[0]) == 0x49 && + GETJOCTET(marker->data[1]) == 0x43 && + GETJOCTET(marker->data[2]) == 0x43 && + GETJOCTET(marker->data[3]) == 0x5F && + GETJOCTET(marker->data[4]) == 0x50 && + GETJOCTET(marker->data[5]) == 0x52 && + GETJOCTET(marker->data[6]) == 0x4F && + GETJOCTET(marker->data[7]) == 0x46 && + GETJOCTET(marker->data[8]) == 0x49 && + GETJOCTET(marker->data[9]) == 0x4C && + GETJOCTET(marker->data[10]) == 0x45 && + GETJOCTET(marker->data[11]) == 0x0; +} + + +/* + * See if there was an ICC profile in the JPEG file being read; + * if so, reassemble and return the profile data. + * + * TRUE is returned if an ICC profile was found, FALSE if not. + * If TRUE is returned, *icc_data_ptr is set to point to the + * returned data, and *icc_data_len is set to its length. + * + * IMPORTANT: the data at **icc_data_ptr has been allocated with malloc() + * and must be freed by the caller with free() when the caller no longer + * needs it. (Alternatively, we could write this routine to use the + * IJG library's memory allocator, so that the data would be freed implicitly + * at jpeg_finish_decompress() time. But it seems likely that many apps + * will prefer to have the data stick around after decompression finishes.) + * + * NOTE: if the file contains invalid ICC APP2 markers, we just silently + * return FALSE. You might want to issue an error message instead. + */ + +boolean +read_icc_profile (j_decompress_ptr cinfo, + JOCTET **icc_data_ptr, + unsigned int *icc_data_len) +{ + jpeg_saved_marker_ptr marker; + int num_markers = 0; + int seq_no; + JOCTET *icc_data; + unsigned int total_length; +#define MAX_SEQ_NO 255 /* sufficient since marker numbers are bytes */ + char marker_present[MAX_SEQ_NO+1]; /* 1 if marker found */ + unsigned int data_length[MAX_SEQ_NO+1]; /* size of profile data in marker */ + unsigned int data_offset[MAX_SEQ_NO+1]; /* offset for data in marker */ + + *icc_data_ptr = NULL; /* avoid confusion if FALSE return */ + *icc_data_len = 0; + + /* This first pass over the saved markers discovers whether there are + * any ICC markers and verifies the consistency of the marker numbering. + */ + + for (seq_no = 1; seq_no <= MAX_SEQ_NO; seq_no++) + marker_present[seq_no] = 0; + + for (marker = cinfo->marker_list; marker != NULL; marker = marker->next) { + if (marker_is_icc(marker)) { + if (num_markers == 0) + num_markers = GETJOCTET(marker->data[13]); + else if (num_markers != GETJOCTET(marker->data[13])) + return FALSE; /* inconsistent num_markers fields */ + seq_no = GETJOCTET(marker->data[12]); + if (seq_no <= 0 || seq_no > num_markers) + return FALSE; /* bogus sequence number */ + if (marker_present[seq_no]) + return FALSE; /* duplicate sequence numbers */ + marker_present[seq_no] = 1; + data_length[seq_no] = marker->data_length - ICC_OVERHEAD_LEN; + } + } + + if (num_markers == 0) + return FALSE; + + /* Check for missing markers, count total space needed, + * compute offset of each marker's part of the data. + */ + + total_length = 0; + for (seq_no = 1; seq_no <= num_markers; seq_no++) { + if (marker_present[seq_no] == 0) + return FALSE; /* missing sequence number */ + data_offset[seq_no] = total_length; + total_length += data_length[seq_no]; + } + + if (total_length <= 0) + return FALSE; /* found only empty markers? */ + + /* Allocate space for assembled data */ + icc_data = (JOCTET *) malloc(total_length * sizeof(JOCTET)); + if (icc_data == NULL) + return FALSE; /* oops, out of memory */ + + /* and fill it in */ + for (marker = cinfo->marker_list; marker != NULL; marker = marker->next) { + if (marker_is_icc(marker)) { + JOCTET FAR *src_ptr; + JOCTET *dst_ptr; + unsigned int length; + seq_no = GETJOCTET(marker->data[12]); + dst_ptr = icc_data + data_offset[seq_no]; + src_ptr = marker->data + ICC_OVERHEAD_LEN; + length = data_length[seq_no]; + while (length--) { + *dst_ptr++ = *src_ptr++; + } + } + } + + *icc_data_ptr = icc_data; + *icc_data_len = total_length; + + return TRUE; +} |