michael@0: /* vim: set ts=8 sw=8 noexpandtab: */
michael@0: //  qcms
michael@0: //  Copyright (C) 2009 Mozilla Foundation
michael@0: //  Copyright (C) 1998-2007 Marti Maria
michael@0: //
michael@0: // Permission is hereby granted, free of charge, to any person obtaining 
michael@0: // a copy of this software and associated documentation files (the "Software"), 
michael@0: // to deal in the Software without restriction, including without limitation 
michael@0: // the rights to use, copy, modify, merge, publish, distribute, sublicense, 
michael@0: // and/or sell copies of the Software, and to permit persons to whom the Software 
michael@0: // is furnished to do so, subject to the following conditions:
michael@0: //
michael@0: // The above copyright notice and this permission notice shall be included in 
michael@0: // all copies or substantial portions of the Software.
michael@0: //
michael@0: // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
michael@0: // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO 
michael@0: // THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
michael@0: // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
michael@0: // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 
michael@0: // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 
michael@0: // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
michael@0: 
michael@0: #include <math.h>
michael@0: #include <assert.h>
michael@0: #include <stdlib.h>
michael@0: #include <string.h> //memset
michael@0: #include "qcmsint.h"
michael@0: 
michael@0: /* It might be worth having a unified limit on content controlled
michael@0:  * allocation per profile. This would remove the need for many
michael@0:  * of the arbitrary limits that we used */
michael@0: 
michael@0: typedef uint32_t be32;
michael@0: typedef uint16_t be16;
michael@0: 
michael@0: static be32 cpu_to_be32(uint32_t v)
michael@0: {
michael@0: #ifdef IS_LITTLE_ENDIAN
michael@0: 	return ((v & 0xff) << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | ((v & 0xff000000) >> 24);
michael@0: #else
michael@0: 	return v;
michael@0: #endif
michael@0: }
michael@0: 
michael@0: static be16 cpu_to_be16(uint16_t v)
michael@0: {
michael@0: #ifdef IS_LITTLE_ENDIAN
michael@0: 	return ((v & 0xff) << 8) | ((v & 0xff00) >> 8);
michael@0: #else
michael@0: 	return v;
michael@0: #endif
michael@0: }
michael@0: 
michael@0: static uint32_t be32_to_cpu(be32 v)
michael@0: {
michael@0: #ifdef IS_LITTLE_ENDIAN
michael@0: 	return ((v & 0xff) << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | ((v & 0xff000000) >> 24);
michael@0: 	//return __builtin_bswap32(v);
michael@0: #else
michael@0: 	return v;
michael@0: #endif
michael@0: }
michael@0: 
michael@0: static uint16_t be16_to_cpu(be16 v)
michael@0: {
michael@0: #ifdef IS_LITTLE_ENDIAN
michael@0: 	return ((v & 0xff) << 8) | ((v & 0xff00) >> 8);
michael@0: #else
michael@0: 	return v;
michael@0: #endif
michael@0: }
michael@0: 
michael@0: /* a wrapper around the memory that we are going to parse
michael@0:  * into a qcms_profile */
michael@0: struct mem_source
michael@0: {
michael@0: 	const unsigned char *buf;
michael@0: 	size_t size;
michael@0: 	qcms_bool valid;
michael@0: 	const char *invalid_reason;
michael@0: };
michael@0: 
michael@0: static void invalid_source(struct mem_source *mem, const char *reason)
michael@0: {
michael@0: 	mem->valid = false;
michael@0: 	mem->invalid_reason = reason;
michael@0: }
michael@0: 
michael@0: static uint32_t read_u32(struct mem_source *mem, size_t offset)
michael@0: {
michael@0: 	/* Subtract from mem->size instead of the more intuitive adding to offset.
michael@0: 	 * This avoids overflowing offset. The subtraction is safe because
michael@0: 	 * mem->size is guaranteed to be > 4 */
michael@0: 	if (offset > mem->size - 4) {
michael@0: 		invalid_source(mem, "Invalid offset");
michael@0: 		return 0;
michael@0: 	} else {
michael@0: 		be32 k;
michael@0: 		memcpy(&k, mem->buf + offset, sizeof(k));
michael@0: 		return be32_to_cpu(k);
michael@0: 	}
michael@0: }
michael@0: 
michael@0: static uint16_t read_u16(struct mem_source *mem, size_t offset)
michael@0: {
michael@0: 	if (offset > mem->size - 2) {
michael@0: 		invalid_source(mem, "Invalid offset");
michael@0: 		return 0;
michael@0: 	} else {
michael@0: 		be16 k;
michael@0: 		memcpy(&k, mem->buf + offset, sizeof(k));
michael@0: 		return be16_to_cpu(k);
michael@0: 	}
michael@0: }
michael@0: 
michael@0: static uint8_t read_u8(struct mem_source *mem, size_t offset)
michael@0: {
michael@0: 	if (offset > mem->size - 1) {
michael@0: 		invalid_source(mem, "Invalid offset");
michael@0: 		return 0;
michael@0: 	} else {
michael@0: 		return *(uint8_t*)(mem->buf + offset);
michael@0: 	}
michael@0: }
michael@0: 
michael@0: static s15Fixed16Number read_s15Fixed16Number(struct mem_source *mem, size_t offset)
michael@0: {
michael@0: 	return read_u32(mem, offset);
michael@0: }
michael@0: 
michael@0: static uInt8Number read_uInt8Number(struct mem_source *mem, size_t offset)
michael@0: {
michael@0: 	return read_u8(mem, offset);
michael@0: }
michael@0: 
michael@0: static uInt16Number read_uInt16Number(struct mem_source *mem, size_t offset)
michael@0: {
michael@0: 	return read_u16(mem, offset);
michael@0: }
michael@0: 
michael@0: static void write_u32(void *mem, size_t offset, uint32_t value)
michael@0: {
michael@0:     *((uint32_t *)((unsigned char*)mem + offset)) = cpu_to_be32(value);
michael@0: }
michael@0: 
michael@0: static void write_u16(void *mem, size_t offset, uint16_t value)
michael@0: {
michael@0:     *((uint16_t *)((unsigned char*)mem + offset)) = cpu_to_be16(value);
michael@0: }
michael@0: 
michael@0: #define BAD_VALUE_PROFILE NULL
michael@0: #define INVALID_PROFILE NULL
michael@0: #define NO_MEM_PROFILE NULL
michael@0: 
michael@0: /* An arbitrary 4MB limit on profile size */
michael@0: #define MAX_PROFILE_SIZE 1024*1024*4
michael@0: #define MAX_TAG_COUNT 1024
michael@0: 
michael@0: static void check_CMM_type_signature(struct mem_source *src)
michael@0: {
michael@0: 	//uint32_t CMM_type_signature = read_u32(src, 4);
michael@0: 	//TODO: do the check?
michael@0: 
michael@0: }
michael@0: 
michael@0: static void check_profile_version(struct mem_source *src)
michael@0: {
michael@0: 
michael@0: 	/*
michael@0: 	uint8_t major_revision = read_u8(src, 8 + 0);
michael@0: 	uint8_t minor_revision = read_u8(src, 8 + 1);
michael@0: 	*/
michael@0: 	uint8_t reserved1      = read_u8(src, 8 + 2);
michael@0: 	uint8_t reserved2      = read_u8(src, 8 + 3);
michael@0: 	/* Checking the version doesn't buy us anything
michael@0: 	if (major_revision != 0x4) {
michael@0: 		if (major_revision > 0x2)
michael@0: 			invalid_source(src, "Unsupported major revision");
michael@0: 		if (minor_revision > 0x40)
michael@0: 			invalid_source(src, "Unsupported minor revision");
michael@0: 	}
michael@0: 	*/
michael@0: 	if (reserved1 != 0 || reserved2 != 0)
michael@0: 		invalid_source(src, "Invalid reserved bytes");
michael@0: }
michael@0: 
michael@0: #define INPUT_DEVICE_PROFILE   0x73636e72 // 'scnr'
michael@0: #define DISPLAY_DEVICE_PROFILE 0x6d6e7472 // 'mntr'
michael@0: #define OUTPUT_DEVICE_PROFILE  0x70727472 // 'prtr'
michael@0: #define DEVICE_LINK_PROFILE    0x6c696e6b // 'link'
michael@0: #define COLOR_SPACE_PROFILE    0x73706163 // 'spac'
michael@0: #define ABSTRACT_PROFILE       0x61627374 // 'abst'
michael@0: #define NAMED_COLOR_PROFILE    0x6e6d636c // 'nmcl'
michael@0: 
michael@0: static void read_class_signature(qcms_profile *profile, struct mem_source *mem)
michael@0: {
michael@0: 	profile->class = read_u32(mem, 12);
michael@0: 	switch (profile->class) {
michael@0: 		case DISPLAY_DEVICE_PROFILE:
michael@0: 		case INPUT_DEVICE_PROFILE:
michael@0: 		case OUTPUT_DEVICE_PROFILE:
michael@0: 		case COLOR_SPACE_PROFILE:
michael@0: 			break;
michael@0: 		default:
michael@0: 			invalid_source(mem, "Invalid  Profile/Device Class signature");
michael@0: 	}
michael@0: }
michael@0: 
michael@0: static void read_color_space(qcms_profile *profile, struct mem_source *mem)
michael@0: {
michael@0: 	profile->color_space = read_u32(mem, 16);
michael@0: 	switch (profile->color_space) {
michael@0: 		case RGB_SIGNATURE:
michael@0: 		case GRAY_SIGNATURE:
michael@0: 			break;
michael@0: 		default:
michael@0: 			invalid_source(mem, "Unsupported colorspace");
michael@0: 	}
michael@0: }
michael@0: 
michael@0: static void read_pcs(qcms_profile *profile, struct mem_source *mem)
michael@0: {
michael@0: 	profile->pcs = read_u32(mem, 20);
michael@0: 	switch (profile->pcs) {
michael@0: 		case XYZ_SIGNATURE:
michael@0: 		case LAB_SIGNATURE:
michael@0: 			break;
michael@0: 		default:
michael@0: 			invalid_source(mem, "Unsupported pcs");
michael@0: 	}
michael@0: }
michael@0: 
michael@0: struct tag
michael@0: {
michael@0: 	uint32_t signature;
michael@0: 	uint32_t offset;
michael@0: 	uint32_t size;
michael@0: };
michael@0: 
michael@0: struct tag_index {
michael@0: 	uint32_t count;
michael@0: 	struct tag *tags;
michael@0: };
michael@0: 
michael@0: static struct tag_index read_tag_table(qcms_profile *profile, struct mem_source *mem)
michael@0: {
michael@0: 	struct tag_index index = {0, NULL};
michael@0: 	unsigned int i;
michael@0: 
michael@0: 	index.count = read_u32(mem, 128);
michael@0: 	if (index.count > MAX_TAG_COUNT) {
michael@0: 		invalid_source(mem, "max number of tags exceeded");
michael@0: 		return index;
michael@0: 	}
michael@0: 
michael@0: 	index.tags = malloc(sizeof(struct tag)*index.count);
michael@0: 	if (index.tags) {
michael@0: 		for (i = 0; i < index.count; i++) {
michael@0: 			index.tags[i].signature = read_u32(mem, 128 + 4 + 4*i*3);
michael@0: 			index.tags[i].offset    = read_u32(mem, 128 + 4 + 4*i*3 + 4);
michael@0: 			index.tags[i].size      = read_u32(mem, 128 + 4 + 4*i*3 + 8);
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	return index;
michael@0: }
michael@0: 
michael@0: // Checks a profile for obvious inconsistencies and returns
michael@0: // true if the profile looks bogus and should probably be
michael@0: // ignored.
michael@0: qcms_bool qcms_profile_is_bogus(qcms_profile *profile)
michael@0: {
michael@0:        float sum[3], target[3], tolerance[3];
michael@0:        float rX, rY, rZ, gX, gY, gZ, bX, bY, bZ;
michael@0:        bool negative;
michael@0:        unsigned i;
michael@0: 
michael@0:        // We currently only check the bogosity of RGB profiles
michael@0:        if (profile->color_space != RGB_SIGNATURE)
michael@0: 	       return false;
michael@0: 
michael@0:        if (profile->A2B0 || profile->B2A0)
michael@0:                return false;
michael@0: 
michael@0:        rX = s15Fixed16Number_to_float(profile->redColorant.X);
michael@0:        rY = s15Fixed16Number_to_float(profile->redColorant.Y);
michael@0:        rZ = s15Fixed16Number_to_float(profile->redColorant.Z);
michael@0: 
michael@0:        gX = s15Fixed16Number_to_float(profile->greenColorant.X);
michael@0:        gY = s15Fixed16Number_to_float(profile->greenColorant.Y);
michael@0:        gZ = s15Fixed16Number_to_float(profile->greenColorant.Z);
michael@0: 
michael@0:        bX = s15Fixed16Number_to_float(profile->blueColorant.X);
michael@0:        bY = s15Fixed16Number_to_float(profile->blueColorant.Y);
michael@0:        bZ = s15Fixed16Number_to_float(profile->blueColorant.Z);
michael@0: 
michael@0:        // Check if any of the XYZ values are negative (see mozilla bug 498245)
michael@0:        // CIEXYZ tristimulus values cannot be negative according to the spec.
michael@0:        negative =
michael@0: 	       (rX < 0) || (rY < 0) || (rZ < 0) ||
michael@0: 	       (gX < 0) || (gY < 0) || (gZ < 0) ||
michael@0: 	       (bX < 0) || (bY < 0) || (bZ < 0);
michael@0: 
michael@0:        if (negative)
michael@0: 	       return true;
michael@0: 
michael@0: 
michael@0:        // Sum the values; they should add up to something close to white
michael@0:        sum[0] = rX + gX + bX;
michael@0:        sum[1] = rY + gY + bY;
michael@0:        sum[2] = rZ + gZ + bZ;
michael@0: 
michael@0:        // Build our target vector (see mozilla bug 460629)
michael@0:        target[0] = 0.96420;
michael@0:        target[1] = 1.00000;
michael@0:        target[2] = 0.82491;
michael@0: 
michael@0:        // Our tolerance vector - Recommended by Chris Murphy based on
michael@0:        // conversion from the LAB space criterion of no more than 3 in any one
michael@0:        // channel. This is similar to, but slightly more tolerant than Adobe's
michael@0:        // criterion.
michael@0:        tolerance[0] = 0.02;
michael@0:        tolerance[1] = 0.02;
michael@0:        tolerance[2] = 0.04;
michael@0: 
michael@0:        // Compare with our tolerance
michael@0:        for (i = 0; i < 3; ++i) {
michael@0:            if (!(((sum[i] - tolerance[i]) <= target[i]) &&
michael@0:                  ((sum[i] + tolerance[i]) >= target[i])))
michael@0:                return true;
michael@0:        }
michael@0: 
michael@0:        // All Good
michael@0:        return false;
michael@0: }
michael@0: 
michael@0: #define TAG_bXYZ 0x6258595a
michael@0: #define TAG_gXYZ 0x6758595a
michael@0: #define TAG_rXYZ 0x7258595a
michael@0: #define TAG_rTRC 0x72545243
michael@0: #define TAG_bTRC 0x62545243
michael@0: #define TAG_gTRC 0x67545243
michael@0: #define TAG_kTRC 0x6b545243
michael@0: #define TAG_A2B0 0x41324230
michael@0: #define TAG_B2A0 0x42324130
michael@0: #define TAG_CHAD 0x63686164
michael@0: 
michael@0: static struct tag *find_tag(struct tag_index index, uint32_t tag_id)
michael@0: {
michael@0: 	unsigned int i;
michael@0: 	struct tag *tag = NULL;
michael@0: 	for (i = 0; i < index.count; i++) {
michael@0: 		if (index.tags[i].signature == tag_id) {
michael@0: 			return &index.tags[i];
michael@0: 		}
michael@0: 	}
michael@0: 	return tag;
michael@0: }
michael@0: 
michael@0: #define XYZ_TYPE		0x58595a20 // 'XYZ '
michael@0: #define CURVE_TYPE		0x63757276 // 'curv'
michael@0: #define PARAMETRIC_CURVE_TYPE	0x70617261 // 'para'
michael@0: #define LUT16_TYPE		0x6d667432 // 'mft2'
michael@0: #define LUT8_TYPE		0x6d667431 // 'mft1'
michael@0: #define LUT_MAB_TYPE		0x6d414220 // 'mAB '
michael@0: #define LUT_MBA_TYPE		0x6d424120 // 'mBA '
michael@0: #define CHROMATIC_TYPE		0x73663332 // 'sf32'
michael@0: 
michael@0: static struct matrix read_tag_s15Fixed16ArrayType(struct mem_source *src, struct tag_index index, uint32_t tag_id)
michael@0: {
michael@0: 	struct tag *tag = find_tag(index, tag_id);
michael@0: 	struct matrix matrix;
michael@0: 	if (tag) {
michael@0: 		uint8_t i;
michael@0: 		uint32_t offset = tag->offset;
michael@0: 		uint32_t type = read_u32(src, offset);
michael@0: 
michael@0: 		// Check mandatory type signature for s16Fixed16ArrayType
michael@0: 		if (type != CHROMATIC_TYPE) {
michael@0: 			invalid_source(src, "unexpected type, expected 'sf32'");
michael@0: 		}
michael@0: 
michael@0: 		for (i = 0; i < 9; i++) {
michael@0: 			matrix.m[i/3][i%3] = s15Fixed16Number_to_float(read_s15Fixed16Number(src, offset+8+i*4));
michael@0: 		}
michael@0: 		matrix.invalid = false;
michael@0: 	} else {
michael@0: 		matrix.invalid = true;
michael@0: 		invalid_source(src, "missing sf32tag");
michael@0: 	}
michael@0: 	return matrix;
michael@0: }
michael@0: 
michael@0: static struct XYZNumber read_tag_XYZType(struct mem_source *src, struct tag_index index, uint32_t tag_id)
michael@0: {
michael@0: 	struct XYZNumber num = {0, 0, 0};
michael@0: 	struct tag *tag = find_tag(index, tag_id);
michael@0: 	if (tag) {
michael@0: 		uint32_t offset = tag->offset;
michael@0: 
michael@0: 		uint32_t type = read_u32(src, offset);
michael@0: 		if (type != XYZ_TYPE)
michael@0: 			invalid_source(src, "unexpected type, expected XYZ");
michael@0: 		num.X = read_s15Fixed16Number(src, offset+8);
michael@0: 		num.Y = read_s15Fixed16Number(src, offset+12);
michael@0: 		num.Z = read_s15Fixed16Number(src, offset+16);
michael@0: 	} else {
michael@0: 		invalid_source(src, "missing xyztag");
michael@0: 	}
michael@0: 	return num;
michael@0: }
michael@0: 
michael@0: // Read the tag at a given offset rather then the tag_index. 
michael@0: // This method is used when reading mAB tags where nested curveType are
michael@0: // present that are not part of the tag_index.
michael@0: static struct curveType *read_curveType(struct mem_source *src, uint32_t offset, uint32_t *len)
michael@0: {
michael@0: 	static const uint32_t COUNT_TO_LENGTH[5] = {1, 3, 4, 5, 7};
michael@0: 	struct curveType *curve = NULL;
michael@0: 	uint32_t type = read_u32(src, offset);
michael@0: 	uint32_t count;
michael@0: 	uint32_t i;
michael@0: 
michael@0: 	if (type != CURVE_TYPE && type != PARAMETRIC_CURVE_TYPE) {
michael@0: 		invalid_source(src, "unexpected type, expected CURV or PARA");
michael@0: 		return NULL;
michael@0: 	}
michael@0: 
michael@0: 	if (type == CURVE_TYPE) {
michael@0: 		count = read_u32(src, offset+8);
michael@0: 
michael@0: #define MAX_CURVE_ENTRIES 40000 //arbitrary
michael@0: 		if (count > MAX_CURVE_ENTRIES) {
michael@0: 			invalid_source(src, "curve size too large");
michael@0: 			return NULL;
michael@0: 		}
michael@0: 		curve = malloc(sizeof(struct curveType) + sizeof(uInt16Number)*count);
michael@0: 		if (!curve)
michael@0: 			return NULL;
michael@0: 
michael@0: 		curve->count = count;
michael@0: 		curve->type = CURVE_TYPE;
michael@0: 
michael@0: 		for (i=0; i<count; i++) {
michael@0: 			curve->data[i] = read_u16(src, offset + 12 + i*2);
michael@0: 		}
michael@0: 		*len = 12 + count * 2;
michael@0: 	} else { //PARAMETRIC_CURVE_TYPE
michael@0: 		count = read_u16(src, offset+8);
michael@0: 
michael@0: 		if (count > 4) {
michael@0: 			invalid_source(src, "parametric function type not supported.");
michael@0: 			return NULL;
michael@0: 		}
michael@0: 
michael@0: 		curve = malloc(sizeof(struct curveType));
michael@0: 		if (!curve)
michael@0: 			return NULL;
michael@0: 
michael@0: 		curve->count = count;
michael@0: 		curve->type = PARAMETRIC_CURVE_TYPE;
michael@0: 
michael@0: 		for (i=0; i < COUNT_TO_LENGTH[count]; i++) {
michael@0: 			curve->parameter[i] = s15Fixed16Number_to_float(read_s15Fixed16Number(src, offset + 12 + i*4));	
michael@0: 		}
michael@0: 		*len = 12 + COUNT_TO_LENGTH[count] * 4;
michael@0: 
michael@0: 		if ((count == 1 || count == 2)) {
michael@0: 			/* we have a type 1 or type 2 function that has a division by 'a' */
michael@0: 			float a = curve->parameter[1];
michael@0: 			if (a == 0.f)
michael@0: 				invalid_source(src, "parametricCurve definition causes division by zero.");
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	return curve;
michael@0: }
michael@0: 
michael@0: static struct curveType *read_tag_curveType(struct mem_source *src, struct tag_index index, uint32_t tag_id)
michael@0: {
michael@0: 	struct tag *tag = find_tag(index, tag_id);
michael@0: 	struct curveType *curve = NULL;
michael@0: 	if (tag) {
michael@0: 		uint32_t len;
michael@0: 		return read_curveType(src, tag->offset, &len);
michael@0: 	} else {
michael@0: 		invalid_source(src, "missing curvetag");
michael@0: 	}
michael@0: 
michael@0: 	return curve;
michael@0: }
michael@0: 
michael@0: #define MAX_CLUT_SIZE 500000 // arbitrary
michael@0: #define MAX_CHANNELS 10 // arbitrary
michael@0: static void read_nested_curveType(struct mem_source *src, struct curveType *(*curveArray)[MAX_CHANNELS], uint8_t num_channels, uint32_t curve_offset)
michael@0: {
michael@0: 	uint32_t channel_offset = 0;
michael@0: 	int i;
michael@0: 	for (i = 0; i < num_channels; i++) {
michael@0: 		uint32_t tag_len;
michael@0: 
michael@0: 		(*curveArray)[i] = read_curveType(src, curve_offset + channel_offset, &tag_len);
michael@0: 		if (!(*curveArray)[i]) {
michael@0: 			invalid_source(src, "invalid nested curveType curve");
michael@0: 		}
michael@0: 
michael@0: 		channel_offset += tag_len;
michael@0: 		// 4 byte aligned
michael@0: 		if ((tag_len % 4) != 0)
michael@0: 			channel_offset += 4 - (tag_len % 4);
michael@0: 	}
michael@0: 
michael@0: }
michael@0: 
michael@0: static void mAB_release(struct lutmABType *lut)
michael@0: {
michael@0: 	uint8_t i;
michael@0: 
michael@0: 	for (i = 0; i < lut->num_in_channels; i++){
michael@0: 		free(lut->a_curves[i]);
michael@0: 	}
michael@0: 	for (i = 0; i < lut->num_out_channels; i++){
michael@0: 		free(lut->b_curves[i]);
michael@0: 		free(lut->m_curves[i]);
michael@0: 	}
michael@0: 	free(lut);
michael@0: }
michael@0: 
michael@0: /* See section 10.10 for specs */
michael@0: static struct lutmABType *read_tag_lutmABType(struct mem_source *src, struct tag_index index, uint32_t tag_id)
michael@0: {
michael@0: 	struct tag *tag = find_tag(index, tag_id);
michael@0: 	uint32_t offset = tag->offset;
michael@0: 	uint32_t a_curve_offset, b_curve_offset, m_curve_offset;
michael@0: 	uint32_t matrix_offset;
michael@0: 	uint32_t clut_offset;
michael@0: 	uint32_t clut_size = 1;
michael@0: 	uint8_t clut_precision;
michael@0: 	uint32_t type = read_u32(src, offset);
michael@0: 	uint8_t num_in_channels, num_out_channels;
michael@0: 	struct lutmABType *lut;
michael@0: 	uint32_t i;
michael@0: 
michael@0: 	if (type != LUT_MAB_TYPE && type != LUT_MBA_TYPE) {
michael@0: 		return NULL;
michael@0: 	}
michael@0: 
michael@0: 	num_in_channels = read_u8(src, offset + 8);
michael@0: 	num_out_channels = read_u8(src, offset + 8);
michael@0: 	if (num_in_channels > MAX_CHANNELS || num_out_channels > MAX_CHANNELS)
michael@0: 		return NULL;
michael@0: 
michael@0: 	// We require 3in/out channels since we only support RGB->XYZ (or RGB->LAB)
michael@0: 	// XXX: If we remove this restriction make sure that the number of channels
michael@0: 	//      is less or equal to the maximum number of mAB curves in qcmsint.h
michael@0: 	//      also check for clut_size overflow.
michael@0: 	if (num_in_channels != 3 || num_out_channels != 3)
michael@0: 		return NULL;
michael@0: 
michael@0: 	// some of this data is optional and is denoted by a zero offset
michael@0: 	// we also use this to track their existance
michael@0: 	a_curve_offset = read_u32(src, offset + 28);
michael@0: 	clut_offset = read_u32(src, offset + 24);
michael@0: 	m_curve_offset = read_u32(src, offset + 20);
michael@0: 	matrix_offset = read_u32(src, offset + 16);
michael@0: 	b_curve_offset = read_u32(src, offset + 12);
michael@0: 
michael@0: 	// Convert offsets relative to the tag to relative to the profile
michael@0: 	// preserve zero for optional fields
michael@0: 	if (a_curve_offset)
michael@0: 		a_curve_offset += offset;
michael@0: 	if (clut_offset)
michael@0: 		clut_offset += offset;
michael@0: 	if (m_curve_offset)
michael@0: 		m_curve_offset += offset;
michael@0: 	if (matrix_offset)
michael@0: 		matrix_offset += offset;
michael@0: 	if (b_curve_offset)
michael@0: 		b_curve_offset += offset;
michael@0: 
michael@0: 	if (clut_offset) {
michael@0: 		assert (num_in_channels == 3);
michael@0: 		// clut_size can not overflow since lg(256^num_in_channels) = 24 bits.
michael@0: 		for (i = 0; i < num_in_channels; i++) {
michael@0: 			clut_size *= read_u8(src, clut_offset + i);
michael@0: 		}
michael@0: 	} else {
michael@0: 		clut_size = 0;
michael@0: 	}
michael@0: 
michael@0: 	// 24bits * 3 won't overflow either
michael@0: 	clut_size = clut_size * num_out_channels;
michael@0: 
michael@0: 	if (clut_size > MAX_CLUT_SIZE)
michael@0: 		return NULL;
michael@0: 
michael@0: 	lut = malloc(sizeof(struct lutmABType) + (clut_size) * sizeof(float));
michael@0: 	if (!lut)
michael@0: 		return NULL;
michael@0: 	// we'll fill in the rest below
michael@0: 	memset(lut, 0, sizeof(struct lutmABType));
michael@0: 	lut->clut_table   = &lut->clut_table_data[0];
michael@0: 
michael@0: 	for (i = 0; i < num_in_channels; i++) {
michael@0: 		lut->num_grid_points[i] = read_u8(src, clut_offset + i);
michael@0: 	}
michael@0: 
michael@0: 	// Reverse the processing of transformation elements for mBA type.
michael@0: 	lut->reversed = (type == LUT_MBA_TYPE);
michael@0: 
michael@0: 	lut->num_in_channels = num_in_channels;
michael@0: 	lut->num_out_channels = num_out_channels;
michael@0: 
michael@0: 	if (matrix_offset) {
michael@0: 		// read the matrix if we have it
michael@0: 		lut->e00 = read_s15Fixed16Number(src, matrix_offset+4*0);
michael@0: 		lut->e01 = read_s15Fixed16Number(src, matrix_offset+4*1);
michael@0: 		lut->e02 = read_s15Fixed16Number(src, matrix_offset+4*2);
michael@0: 		lut->e10 = read_s15Fixed16Number(src, matrix_offset+4*3);
michael@0: 		lut->e11 = read_s15Fixed16Number(src, matrix_offset+4*4);
michael@0: 		lut->e12 = read_s15Fixed16Number(src, matrix_offset+4*5);
michael@0: 		lut->e20 = read_s15Fixed16Number(src, matrix_offset+4*6);
michael@0: 		lut->e21 = read_s15Fixed16Number(src, matrix_offset+4*7);
michael@0: 		lut->e22 = read_s15Fixed16Number(src, matrix_offset+4*8);
michael@0: 		lut->e03 = read_s15Fixed16Number(src, matrix_offset+4*9);
michael@0: 		lut->e13 = read_s15Fixed16Number(src, matrix_offset+4*10);
michael@0: 		lut->e23 = read_s15Fixed16Number(src, matrix_offset+4*11);
michael@0: 	}
michael@0: 
michael@0: 	if (a_curve_offset) {
michael@0: 		read_nested_curveType(src, &lut->a_curves, num_in_channels, a_curve_offset);
michael@0: 	}
michael@0: 	if (m_curve_offset) {
michael@0: 		read_nested_curveType(src, &lut->m_curves, num_out_channels, m_curve_offset);
michael@0: 	}
michael@0: 	if (b_curve_offset) {
michael@0: 		read_nested_curveType(src, &lut->b_curves, num_out_channels, b_curve_offset);
michael@0: 	} else {
michael@0: 		invalid_source(src, "B curves required");
michael@0: 	}
michael@0: 
michael@0: 	if (clut_offset) {
michael@0: 		clut_precision = read_u8(src, clut_offset + 16);
michael@0: 		if (clut_precision == 1) {
michael@0: 			for (i = 0; i < clut_size; i++) {
michael@0: 				lut->clut_table[i] = uInt8Number_to_float(read_uInt8Number(src, clut_offset + 20 + i*1));
michael@0: 			}
michael@0: 		} else if (clut_precision == 2) {
michael@0: 			for (i = 0; i < clut_size; i++) {
michael@0: 				lut->clut_table[i] = uInt16Number_to_float(read_uInt16Number(src, clut_offset + 20 + i*2));
michael@0: 			}
michael@0: 		} else {
michael@0: 			invalid_source(src, "Invalid clut precision");
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	if (!src->valid) {
michael@0: 		mAB_release(lut);
michael@0: 		return NULL;
michael@0: 	}
michael@0: 
michael@0: 	return lut;
michael@0: }
michael@0: 
michael@0: static struct lutType *read_tag_lutType(struct mem_source *src, struct tag_index index, uint32_t tag_id)
michael@0: {
michael@0: 	struct tag *tag = find_tag(index, tag_id);
michael@0: 	uint32_t offset = tag->offset;
michael@0: 	uint32_t type = read_u32(src, offset);
michael@0: 	uint16_t num_input_table_entries;
michael@0: 	uint16_t num_output_table_entries;
michael@0: 	uint8_t in_chan, grid_points, out_chan;
michael@0: 	uint32_t clut_offset, output_offset;
michael@0: 	uint32_t clut_size;
michael@0: 	size_t entry_size;
michael@0: 	struct lutType *lut;
michael@0: 	uint32_t i;
michael@0: 
michael@0: 	/* I'm not sure why the spec specifies a fixed number of entries for LUT8 tables even though
michael@0: 	 * they have room for the num_entries fields */
michael@0: 	if (type == LUT8_TYPE) {
michael@0: 		num_input_table_entries = 256;
michael@0: 		num_output_table_entries = 256;
michael@0: 		entry_size = 1;
michael@0: 	} else if (type == LUT16_TYPE) {
michael@0: 		num_input_table_entries  = read_u16(src, offset + 48);
michael@0: 		num_output_table_entries = read_u16(src, offset + 50);
michael@0: 		entry_size = 2;
michael@0: 	} else {
michael@0: 		assert(0); // the caller checks that this doesn't happen
michael@0: 		invalid_source(src, "Unexpected lut type");
michael@0: 		return NULL;
michael@0: 	}
michael@0: 
michael@0: 	in_chan     = read_u8(src, offset + 8);
michael@0: 	out_chan    = read_u8(src, offset + 9);
michael@0: 	grid_points = read_u8(src, offset + 10);
michael@0: 
michael@0: 	clut_size = pow(grid_points, in_chan);
michael@0: 	if (clut_size > MAX_CLUT_SIZE) {
michael@0: 		return NULL;
michael@0: 	}
michael@0: 
michael@0: 	if (in_chan != 3 || out_chan != 3) {
michael@0: 		return NULL;
michael@0: 	}
michael@0: 
michael@0: 	lut = malloc(sizeof(struct lutType) + (num_input_table_entries * in_chan + clut_size*out_chan + num_output_table_entries * out_chan)*sizeof(float));
michael@0: 	if (!lut) {
michael@0: 		return NULL;
michael@0: 	}
michael@0: 
michael@0: 	/* compute the offsets of tables */
michael@0: 	lut->input_table  = &lut->table_data[0];
michael@0: 	lut->clut_table   = &lut->table_data[in_chan*num_input_table_entries];
michael@0: 	lut->output_table = &lut->table_data[in_chan*num_input_table_entries + clut_size*out_chan];
michael@0: 
michael@0: 	lut->num_input_table_entries  = num_input_table_entries;
michael@0: 	lut->num_output_table_entries = num_output_table_entries;
michael@0: 	lut->num_input_channels   = read_u8(src, offset + 8);
michael@0: 	lut->num_output_channels  = read_u8(src, offset + 9);
michael@0: 	lut->num_clut_grid_points = read_u8(src, offset + 10);
michael@0: 	lut->e00 = read_s15Fixed16Number(src, offset+12);
michael@0: 	lut->e01 = read_s15Fixed16Number(src, offset+16);
michael@0: 	lut->e02 = read_s15Fixed16Number(src, offset+20);
michael@0: 	lut->e10 = read_s15Fixed16Number(src, offset+24);
michael@0: 	lut->e11 = read_s15Fixed16Number(src, offset+28);
michael@0: 	lut->e12 = read_s15Fixed16Number(src, offset+32);
michael@0: 	lut->e20 = read_s15Fixed16Number(src, offset+36);
michael@0: 	lut->e21 = read_s15Fixed16Number(src, offset+40);
michael@0: 	lut->e22 = read_s15Fixed16Number(src, offset+44);
michael@0: 
michael@0: 	for (i = 0; i < lut->num_input_table_entries * in_chan; i++) {
michael@0: 		if (type == LUT8_TYPE) {
michael@0: 			lut->input_table[i] = uInt8Number_to_float(read_uInt8Number(src, offset + 52 + i * entry_size));
michael@0: 		} else {
michael@0: 			lut->input_table[i] = uInt16Number_to_float(read_uInt16Number(src, offset + 52 + i * entry_size));
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	clut_offset = offset + 52 + lut->num_input_table_entries * in_chan * entry_size;
michael@0: 	for (i = 0; i < clut_size * out_chan; i+=3) {
michael@0: 		if (type == LUT8_TYPE) {
michael@0: 			lut->clut_table[i+0] = uInt8Number_to_float(read_uInt8Number(src, clut_offset + i*entry_size + 0));
michael@0: 			lut->clut_table[i+1] = uInt8Number_to_float(read_uInt8Number(src, clut_offset + i*entry_size + 1));
michael@0: 			lut->clut_table[i+2] = uInt8Number_to_float(read_uInt8Number(src, clut_offset + i*entry_size + 2));
michael@0: 		} else {
michael@0: 			lut->clut_table[i+0] = uInt16Number_to_float(read_uInt16Number(src, clut_offset + i*entry_size + 0));
michael@0: 			lut->clut_table[i+1] = uInt16Number_to_float(read_uInt16Number(src, clut_offset + i*entry_size + 2));
michael@0: 			lut->clut_table[i+2] = uInt16Number_to_float(read_uInt16Number(src, clut_offset + i*entry_size + 4));
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	output_offset = clut_offset + clut_size * out_chan * entry_size;
michael@0: 	for (i = 0; i < lut->num_output_table_entries * out_chan; i++) {
michael@0: 		if (type == LUT8_TYPE) {
michael@0: 			lut->output_table[i] = uInt8Number_to_float(read_uInt8Number(src, output_offset + i*entry_size));
michael@0: 		} else {
michael@0: 			lut->output_table[i] = uInt16Number_to_float(read_uInt16Number(src, output_offset + i*entry_size));
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	return lut;
michael@0: }
michael@0: 
michael@0: static void read_rendering_intent(qcms_profile *profile, struct mem_source *src)
michael@0: {
michael@0: 	profile->rendering_intent = read_u32(src, 64);
michael@0: 	switch (profile->rendering_intent) {
michael@0: 		case QCMS_INTENT_PERCEPTUAL:
michael@0: 		case QCMS_INTENT_SATURATION:
michael@0: 		case QCMS_INTENT_RELATIVE_COLORIMETRIC:
michael@0: 		case QCMS_INTENT_ABSOLUTE_COLORIMETRIC:
michael@0: 			break;
michael@0: 		default:
michael@0: 			invalid_source(src, "unknown rendering intent");
michael@0: 	}
michael@0: }
michael@0: 
michael@0: qcms_profile *qcms_profile_create(void)
michael@0: {
michael@0: 	return calloc(sizeof(qcms_profile), 1);
michael@0: }
michael@0: 
michael@0: 
michael@0: 
michael@0: /* build sRGB gamma table */
michael@0: /* based on cmsBuildParametricGamma() */
michael@0: static uint16_t *build_sRGB_gamma_table(int num_entries)
michael@0: {
michael@0: 	int i;
michael@0: 	/* taken from lcms: Build_sRGBGamma() */
michael@0: 	double gamma = 2.4;
michael@0: 	double a = 1./1.055;
michael@0: 	double b = 0.055/1.055;
michael@0: 	double c = 1./12.92;
michael@0: 	double d = 0.04045;
michael@0: 
michael@0: 	uint16_t *table = malloc(sizeof(uint16_t) * num_entries);
michael@0: 	if (!table)
michael@0: 		return NULL;
michael@0: 
michael@0: 	for (i=0; i<num_entries; i++) {
michael@0: 		double x = (double)i / (num_entries-1);
michael@0: 		double y, output;
michael@0: 		// IEC 61966-2.1 (sRGB)
michael@0: 		// Y = (aX + b)^Gamma | X >= d
michael@0: 		// Y = cX             | X < d
michael@0: 		if (x >= d) {
michael@0: 			double e = (a*x + b);
michael@0: 			if (e > 0)
michael@0: 				y = pow(e, gamma);
michael@0: 			else
michael@0: 				y = 0;
michael@0: 		} else {
michael@0: 			y = c*x;
michael@0: 		}
michael@0: 
michael@0: 		// Saturate -- this could likely move to a separate function
michael@0: 		output = y * 65535. + .5;
michael@0: 		if (output > 65535.)
michael@0: 			output = 65535;
michael@0: 		if (output < 0)
michael@0: 			output = 0;
michael@0: 		table[i] = (uint16_t)floor(output);
michael@0: 	}
michael@0: 	return table;
michael@0: }
michael@0: 
michael@0: static struct curveType *curve_from_table(uint16_t *table, int num_entries)
michael@0: {
michael@0: 	struct curveType *curve;
michael@0: 	int i;
michael@0: 	curve = malloc(sizeof(struct curveType) + sizeof(uInt16Number)*num_entries);
michael@0: 	if (!curve)
michael@0: 		return NULL;
michael@0: 	curve->type = CURVE_TYPE;
michael@0: 	curve->count = num_entries;
michael@0: 	for (i = 0; i < num_entries; i++) {
michael@0: 		curve->data[i] = table[i];
michael@0: 	}
michael@0: 	return curve;
michael@0: }
michael@0: 
michael@0: static uint16_t float_to_u8Fixed8Number(float a)
michael@0: {
michael@0: 	if (a > (255.f + 255.f/256))
michael@0: 		return 0xffff;
michael@0: 	else if (a < 0.f)
michael@0: 		return 0;
michael@0: 	else
michael@0: 		return floorf(a*256.f + .5f);
michael@0: }
michael@0: 
michael@0: static struct curveType *curve_from_gamma(float gamma)
michael@0: {
michael@0: 	struct curveType *curve;
michael@0: 	int num_entries = 1;
michael@0: 	curve = malloc(sizeof(struct curveType) + sizeof(uInt16Number)*num_entries);
michael@0: 	if (!curve)
michael@0: 		return NULL;
michael@0: 	curve->count = num_entries;
michael@0: 	curve->data[0] = float_to_u8Fixed8Number(gamma);
michael@0:   	curve->type = CURVE_TYPE;
michael@0: 	return curve;
michael@0: }
michael@0: 
michael@0: //XXX: it would be nice if we had a way of ensuring
michael@0: // everything in a profile was initialized regardless of how it was created
michael@0: 
michael@0: //XXX: should this also be taking a black_point?
michael@0: /* similar to CGColorSpaceCreateCalibratedRGB */
michael@0: qcms_profile* qcms_profile_create_rgb_with_gamma(
michael@0: 		qcms_CIE_xyY white_point,
michael@0: 		qcms_CIE_xyYTRIPLE primaries,
michael@0: 		float gamma)
michael@0: {
michael@0: 	qcms_profile* profile = qcms_profile_create();
michael@0: 	if (!profile)
michael@0: 		return NO_MEM_PROFILE;
michael@0: 
michael@0: 	//XXX: should store the whitepoint
michael@0: 	if (!set_rgb_colorants(profile, white_point, primaries)) {
michael@0: 		qcms_profile_release(profile);
michael@0: 		return INVALID_PROFILE;
michael@0: 	}
michael@0: 
michael@0: 	profile->redTRC = curve_from_gamma(gamma);
michael@0: 	profile->blueTRC = curve_from_gamma(gamma);
michael@0: 	profile->greenTRC = curve_from_gamma(gamma);
michael@0: 
michael@0: 	if (!profile->redTRC || !profile->blueTRC || !profile->greenTRC) {
michael@0: 		qcms_profile_release(profile);
michael@0: 		return NO_MEM_PROFILE;
michael@0: 	}
michael@0: 	profile->class = DISPLAY_DEVICE_PROFILE;
michael@0: 	profile->rendering_intent = QCMS_INTENT_PERCEPTUAL;
michael@0: 	profile->color_space = RGB_SIGNATURE;
michael@0: 	return profile;
michael@0: }
michael@0: 
michael@0: qcms_profile* qcms_profile_create_rgb_with_table(
michael@0: 		qcms_CIE_xyY white_point,
michael@0: 		qcms_CIE_xyYTRIPLE primaries,
michael@0: 		uint16_t *table, int num_entries)
michael@0: {
michael@0: 	qcms_profile* profile = qcms_profile_create();
michael@0: 	if (!profile)
michael@0: 		return NO_MEM_PROFILE;
michael@0: 
michael@0: 	//XXX: should store the whitepoint
michael@0: 	if (!set_rgb_colorants(profile, white_point, primaries)) {
michael@0: 		qcms_profile_release(profile);
michael@0: 		return INVALID_PROFILE;
michael@0: 	}
michael@0: 
michael@0: 	profile->redTRC = curve_from_table(table, num_entries);
michael@0: 	profile->blueTRC = curve_from_table(table, num_entries);
michael@0: 	profile->greenTRC = curve_from_table(table, num_entries);
michael@0: 
michael@0: 	if (!profile->redTRC || !profile->blueTRC || !profile->greenTRC) {
michael@0: 		qcms_profile_release(profile);
michael@0: 		return NO_MEM_PROFILE;
michael@0: 	}
michael@0: 	profile->class = DISPLAY_DEVICE_PROFILE;
michael@0: 	profile->rendering_intent = QCMS_INTENT_PERCEPTUAL;
michael@0: 	profile->color_space = RGB_SIGNATURE;
michael@0: 	return profile;
michael@0: }
michael@0: 
michael@0: /* from lcms: cmsWhitePointFromTemp */
michael@0: /* tempK must be >= 4000. and <= 25000.
michael@0:  * Invalid values of tempK will return
michael@0:  * (x,y,Y) = (-1.0, -1.0, -1.0)
michael@0:  * similar to argyll: icx_DTEMP2XYZ() */
michael@0: static qcms_CIE_xyY white_point_from_temp(int temp_K)
michael@0: {
michael@0: 	qcms_CIE_xyY white_point;
michael@0: 	double x, y;
michael@0: 	double T, T2, T3;
michael@0: 	// double M1, M2;
michael@0: 
michael@0: 	// No optimization provided.
michael@0: 	T = temp_K;
michael@0: 	T2 = T*T;            // Square
michael@0: 	T3 = T2*T;           // Cube
michael@0: 
michael@0: 	// For correlated color temperature (T) between 4000K and 7000K:
michael@0: 	if (T >= 4000. && T <= 7000.) {
michael@0: 		x = -4.6070*(1E9/T3) + 2.9678*(1E6/T2) + 0.09911*(1E3/T) + 0.244063;
michael@0: 	} else {
michael@0: 		// or for correlated color temperature (T) between 7000K and 25000K:
michael@0: 		if (T > 7000.0 && T <= 25000.0) {
michael@0: 			x = -2.0064*(1E9/T3) + 1.9018*(1E6/T2) + 0.24748*(1E3/T) + 0.237040;
michael@0: 		} else {
michael@0: 			// Invalid tempK
michael@0: 			white_point.x = -1.0;
michael@0: 			white_point.y = -1.0;
michael@0: 			white_point.Y = -1.0;
michael@0: 
michael@0: 			assert(0 && "invalid temp");
michael@0: 
michael@0: 			return white_point;
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	// Obtain y(x)
michael@0: 
michael@0: 	y = -3.000*(x*x) + 2.870*x - 0.275;
michael@0: 
michael@0: 	// wave factors (not used, but here for futures extensions)
michael@0: 
michael@0: 	// M1 = (-1.3515 - 1.7703*x + 5.9114 *y)/(0.0241 + 0.2562*x - 0.7341*y);
michael@0: 	// M2 = (0.0300 - 31.4424*x + 30.0717*y)/(0.0241 + 0.2562*x - 0.7341*y);
michael@0: 
michael@0: 	// Fill white_point struct
michael@0: 	white_point.x = x;
michael@0: 	white_point.y = y;
michael@0: 	white_point.Y = 1.0;
michael@0: 
michael@0: 	return white_point;
michael@0: }
michael@0: 
michael@0: qcms_profile* qcms_profile_sRGB(void)
michael@0: {
michael@0: 	qcms_profile *profile;
michael@0: 	uint16_t *table;
michael@0: 
michael@0: 	qcms_CIE_xyYTRIPLE Rec709Primaries = {
michael@0: 		{0.6400, 0.3300, 1.0},
michael@0: 		{0.3000, 0.6000, 1.0},
michael@0: 		{0.1500, 0.0600, 1.0}
michael@0: 	};
michael@0: 	qcms_CIE_xyY D65;
michael@0: 
michael@0: 	D65 = white_point_from_temp(6504);
michael@0: 
michael@0: 	table = build_sRGB_gamma_table(1024);
michael@0: 
michael@0: 	if (!table)
michael@0: 		return NO_MEM_PROFILE;
michael@0: 
michael@0: 	profile = qcms_profile_create_rgb_with_table(D65, Rec709Primaries, table, 1024);
michael@0: 	free(table);
michael@0: 	return profile;
michael@0: }
michael@0: 
michael@0: 
michael@0: /* qcms_profile_from_memory does not hold a reference to the memory passed in */
michael@0: qcms_profile* qcms_profile_from_memory(const void *mem, size_t size)
michael@0: {
michael@0: 	uint32_t length;
michael@0: 	struct mem_source source;
michael@0: 	struct mem_source *src = &source;
michael@0: 	struct tag_index index;
michael@0: 	qcms_profile *profile;
michael@0: 
michael@0: 	source.buf = mem;
michael@0: 	source.size = size;
michael@0: 	source.valid = true;
michael@0: 
michael@0: 	if (size < 4)
michael@0: 		return INVALID_PROFILE;
michael@0: 
michael@0: 	length = read_u32(src, 0);
michael@0: 	if (length <= size) {
michael@0: 		// shrink the area that we can read if appropriate
michael@0: 		source.size = length;
michael@0: 	} else {
michael@0: 		return INVALID_PROFILE;
michael@0: 	}
michael@0: 
michael@0: 	/* ensure that the profile size is sane so it's easier to reason about */
michael@0: 	if (source.size <= 64 || source.size >= MAX_PROFILE_SIZE)
michael@0: 		return INVALID_PROFILE;
michael@0: 
michael@0: 	profile = qcms_profile_create();
michael@0: 	if (!profile)
michael@0: 		return NO_MEM_PROFILE;
michael@0: 
michael@0: 	check_CMM_type_signature(src);
michael@0: 	check_profile_version(src);
michael@0: 	read_class_signature(profile, src);
michael@0: 	read_rendering_intent(profile, src);
michael@0: 	read_color_space(profile, src);
michael@0: 	read_pcs(profile, src);
michael@0: 	//TODO read rest of profile stuff
michael@0: 
michael@0: 	if (!src->valid)
michael@0: 		goto invalid_profile;
michael@0: 
michael@0: 	index = read_tag_table(profile, src);
michael@0: 	if (!src->valid || !index.tags)
michael@0: 		goto invalid_tag_table;
michael@0: 
michael@0: 	if (find_tag(index, TAG_CHAD)) {
michael@0: 		profile->chromaticAdaption = read_tag_s15Fixed16ArrayType(src, index, TAG_CHAD);
michael@0: 	} else {
michael@0: 		profile->chromaticAdaption.invalid = true; //Signal the data is not present
michael@0: 	}
michael@0: 
michael@0: 	if (profile->class == DISPLAY_DEVICE_PROFILE || profile->class == INPUT_DEVICE_PROFILE ||
michael@0:             profile->class == OUTPUT_DEVICE_PROFILE  || profile->class == COLOR_SPACE_PROFILE) {
michael@0: 		if (profile->color_space == RGB_SIGNATURE) {
michael@0: 			if (find_tag(index, TAG_A2B0)) {
michael@0: 				if (read_u32(src, find_tag(index, TAG_A2B0)->offset) == LUT8_TYPE ||
michael@0: 				    read_u32(src, find_tag(index, TAG_A2B0)->offset) == LUT16_TYPE) {
michael@0: 					profile->A2B0 = read_tag_lutType(src, index, TAG_A2B0);
michael@0: 				} else if (read_u32(src, find_tag(index, TAG_A2B0)->offset) == LUT_MAB_TYPE) {
michael@0: 					profile->mAB = read_tag_lutmABType(src, index, TAG_A2B0);
michael@0: 				}
michael@0: 			}
michael@0: 			if (find_tag(index, TAG_B2A0)) {
michael@0: 				if (read_u32(src, find_tag(index, TAG_B2A0)->offset) == LUT8_TYPE ||
michael@0: 				    read_u32(src, find_tag(index, TAG_B2A0)->offset) == LUT16_TYPE) {
michael@0: 					profile->B2A0 = read_tag_lutType(src, index, TAG_B2A0);
michael@0: 				} else if (read_u32(src, find_tag(index, TAG_B2A0)->offset) == LUT_MBA_TYPE) {
michael@0: 					profile->mBA = read_tag_lutmABType(src, index, TAG_B2A0);
michael@0: 				}
michael@0: 			}
michael@0: 			if (find_tag(index, TAG_rXYZ) || !qcms_supports_iccv4) {
michael@0: 				profile->redColorant = read_tag_XYZType(src, index, TAG_rXYZ);
michael@0: 				profile->greenColorant = read_tag_XYZType(src, index, TAG_gXYZ);
michael@0: 				profile->blueColorant = read_tag_XYZType(src, index, TAG_bXYZ);
michael@0: 			}
michael@0: 
michael@0: 			if (!src->valid)
michael@0: 				goto invalid_tag_table;
michael@0: 
michael@0: 			if (find_tag(index, TAG_rTRC) || !qcms_supports_iccv4) {
michael@0: 				profile->redTRC = read_tag_curveType(src, index, TAG_rTRC);
michael@0: 				profile->greenTRC = read_tag_curveType(src, index, TAG_gTRC);
michael@0: 				profile->blueTRC = read_tag_curveType(src, index, TAG_bTRC);
michael@0: 
michael@0: 				if (!profile->redTRC || !profile->blueTRC || !profile->greenTRC)
michael@0: 					goto invalid_tag_table;
michael@0: 			}
michael@0: 		} else if (profile->color_space == GRAY_SIGNATURE) {
michael@0: 
michael@0: 			profile->grayTRC = read_tag_curveType(src, index, TAG_kTRC);
michael@0: 			if (!profile->grayTRC)
michael@0: 				goto invalid_tag_table;
michael@0: 
michael@0: 		} else {
michael@0: 			assert(0 && "read_color_space protects against entering here");
michael@0: 			goto invalid_tag_table;
michael@0: 		}
michael@0: 	} else {
michael@0: 		goto invalid_tag_table;
michael@0: 	}
michael@0: 
michael@0: 	if (!src->valid)
michael@0: 		goto invalid_tag_table;
michael@0: 
michael@0: 	free(index.tags);
michael@0: 
michael@0: 	return profile;
michael@0: 
michael@0: invalid_tag_table:
michael@0: 	free(index.tags);
michael@0: invalid_profile:
michael@0: 	qcms_profile_release(profile);
michael@0: 	return INVALID_PROFILE;
michael@0: }
michael@0: 
michael@0: qcms_intent qcms_profile_get_rendering_intent(qcms_profile *profile)
michael@0: {
michael@0: 	return profile->rendering_intent;
michael@0: }
michael@0: 
michael@0: icColorSpaceSignature
michael@0: qcms_profile_get_color_space(qcms_profile *profile)
michael@0: {
michael@0: 	return profile->color_space;
michael@0: }
michael@0: 
michael@0: static void lut_release(struct lutType *lut)
michael@0: {
michael@0: 	free(lut);
michael@0: }
michael@0: 
michael@0: void qcms_profile_release(qcms_profile *profile)
michael@0: {
michael@0: 	if (profile->output_table_r)
michael@0: 		precache_release(profile->output_table_r);
michael@0: 	if (profile->output_table_g)
michael@0: 		precache_release(profile->output_table_g);
michael@0: 	if (profile->output_table_b)
michael@0: 		precache_release(profile->output_table_b);
michael@0: 
michael@0: 	if (profile->A2B0)
michael@0: 		lut_release(profile->A2B0);
michael@0: 	if (profile->B2A0)
michael@0: 		lut_release(profile->B2A0);
michael@0: 
michael@0: 	if (profile->mAB)
michael@0: 		mAB_release(profile->mAB);
michael@0: 	if (profile->mBA)
michael@0: 		mAB_release(profile->mBA);
michael@0: 
michael@0: 	free(profile->redTRC);
michael@0: 	free(profile->blueTRC);
michael@0: 	free(profile->greenTRC);
michael@0: 	free(profile->grayTRC);
michael@0: 	free(profile);
michael@0: }
michael@0: 
michael@0: 
michael@0: #include <stdio.h>
michael@0: static void qcms_data_from_file(FILE *file, void **mem, size_t *size)
michael@0: {
michael@0: 	uint32_t length, remaining_length;
michael@0: 	size_t read_length;
michael@0: 	be32 length_be;
michael@0: 	void *data;
michael@0: 
michael@0: 	*mem = NULL;
michael@0: 	*size = 0;
michael@0: 
michael@0: 	if (fread(&length_be, 1, sizeof(length_be), file) != sizeof(length_be))
michael@0: 		return;
michael@0: 
michael@0: 	length = be32_to_cpu(length_be);
michael@0: 	if (length > MAX_PROFILE_SIZE || length < sizeof(length_be))
michael@0: 		return;
michael@0: 
michael@0: 	/* allocate room for the entire profile */
michael@0: 	data = malloc(length);
michael@0: 	if (!data)
michael@0: 		return;
michael@0: 
michael@0: 	/* copy in length to the front so that the buffer will contain the entire profile */
michael@0: 	*((be32*)data) = length_be;
michael@0: 	remaining_length = length - sizeof(length_be);
michael@0: 
michael@0: 	/* read the rest profile */
michael@0: 	read_length = fread((unsigned char*)data + sizeof(length_be), 1, remaining_length, file);
michael@0: 	if (read_length != remaining_length) {
michael@0: 		free(data);
michael@0: 		return;
michael@0: 	}
michael@0: 
michael@0: 	/* successfully get the profile.*/
michael@0: 	*mem = data;
michael@0: 	*size = length;
michael@0: }
michael@0: 
michael@0: qcms_profile* qcms_profile_from_file(FILE *file)
michael@0: {
michael@0: 	size_t length;
michael@0: 	qcms_profile *profile;
michael@0: 	void *data;
michael@0: 
michael@0: 	qcms_data_from_file(file, &data, &length);
michael@0: 	if ((data == NULL) || (length == 0))
michael@0: 		return INVALID_PROFILE;
michael@0: 
michael@0: 	profile = qcms_profile_from_memory(data, length);
michael@0: 	free(data);
michael@0: 	return profile;
michael@0: }
michael@0: 
michael@0: qcms_profile* qcms_profile_from_path(const char *path)
michael@0: {
michael@0: 	qcms_profile *profile = NULL;
michael@0: 	FILE *file = fopen(path, "rb");
michael@0: 	if (file) {
michael@0: 		profile = qcms_profile_from_file(file);
michael@0: 		fclose(file);
michael@0: 	}
michael@0: 	return profile;
michael@0: }
michael@0: 
michael@0: void qcms_data_from_path(const char *path, void **mem, size_t *size)
michael@0: {
michael@0: 	FILE *file = NULL;
michael@0: 	*mem = NULL;
michael@0: 	*size  = 0;
michael@0: 	
michael@0: 	file = fopen(path, "rb");
michael@0: 	if (file) {
michael@0: 		qcms_data_from_file(file, mem, size);
michael@0: 		fclose(file);
michael@0: 	}
michael@0: }
michael@0: 
michael@0: #ifdef _WIN32
michael@0: /* Unicode path version */
michael@0: qcms_profile* qcms_profile_from_unicode_path(const wchar_t *path)
michael@0: {
michael@0: 	qcms_profile *profile = NULL;
michael@0: 	FILE *file = _wfopen(path, L"rb");
michael@0: 	if (file) {
michael@0: 		profile = qcms_profile_from_file(file);
michael@0: 		fclose(file);
michael@0: 	}
michael@0: 	return profile;
michael@0: }
michael@0: 
michael@0: void qcms_data_from_unicode_path(const wchar_t *path, void **mem, size_t *size)
michael@0: {
michael@0: 	FILE *file = NULL;
michael@0: 	*mem = NULL;
michael@0: 	*size  = 0;
michael@0: 	
michael@0: 	file = _wfopen(path, L"rb");
michael@0: 	if (file) {
michael@0: 		qcms_data_from_file(file, mem, size);
michael@0: 		fclose(file);
michael@0: 	}
michael@0: }
michael@0: #endif
michael@0: 
michael@0: /*
michael@0: * This function constructs an ICC profile memory with given header and tag data,
michael@0: * which can be read via qcms_profile_from_memory(). that means, we must satisfy
michael@0: * the profiler header type check (which seems not complete till now) and proper
michael@0: * information to read data from the tag table and tag data elements memory.
michael@0: * 
michael@0: * To construct a valid ICC profile, its divided into three steps :
michael@0: *	(1) construct the r/g/bXYZ part
michael@0: *	(2) construct the r/g/bTRC part
michael@0: *	(3) construct the profile header
michael@0: * this is a hardcode step just for "create_rgb_with_gamma", it is the only
michael@0: * requirement till now, maybe we can make this method more general in future,
michael@0: *
michael@0: * NOTE : some of the parameters below are hardcode, please refer to the ICC documentation.
michael@0: */
michael@0: #define ICC_PROFILE_HEADER_LENGTH 128
michael@0: void qcms_data_create_rgb_with_gamma(qcms_CIE_xyY white_point, qcms_CIE_xyYTRIPLE primaries, float gamma, void **mem, size_t *size)
michael@0: {
michael@0: 	uint32_t length, offset, index, xyz_count, trc_count;
michael@0: 	size_t tag_table_offset, tag_data_offset;
michael@0: 	void *data;
michael@0: 	struct matrix colorants;
michael@0: 
michael@0: 	uint32_t TAG_XYZ[3] = {TAG_rXYZ, TAG_gXYZ, TAG_bXYZ};
michael@0: 	uint32_t TAG_TRC[3] = {TAG_rTRC, TAG_gTRC, TAG_bTRC};
michael@0: 
michael@0: 	if ((mem == NULL) || (size == NULL))
michael@0: 		return;
michael@0: 
michael@0: 	*mem = NULL;
michael@0: 	*size = 0;
michael@0: 
michael@0: 	/* 
michael@0: 	* total length = icc profile header(128) + tag count(4) + 
michael@0: 	* (tag table item (12) * total tag (6 = 3 rTRC + 3 rXYZ)) + rTRC elements data (3 * 20)
michael@0: 	* + rXYZ elements data (3*16), and all tag data elements must start at the 4-byte boundary.
michael@0: 	*/
michael@0: 	xyz_count = 3; // rXYZ, gXYZ, bXYZ
michael@0: 	trc_count = 3; // rTRC, gTRC, bTRC
michael@0: 	length =  ICC_PROFILE_HEADER_LENGTH + 4 + (12 * (xyz_count + trc_count)) + (xyz_count * 20) + (trc_count * 16);
michael@0: 	
michael@0: 	// reserve the total memory.
michael@0: 	data = malloc(length);
michael@0: 	if (!data)
michael@0: 		return;
michael@0: 	memset(data, 0, length);
michael@0: 
michael@0: 	// Part1 : write rXYZ, gXYZ and bXYZ
michael@0: 	if (!get_rgb_colorants(&colorants, white_point, primaries)) {
michael@0: 		free(data);
michael@0: 		return;
michael@0: 	}
michael@0: 
michael@0: 	 // the position of first tag's signature in tag table
michael@0: 	tag_table_offset = ICC_PROFILE_HEADER_LENGTH + 4;
michael@0: 	tag_data_offset = ICC_PROFILE_HEADER_LENGTH + 4 +
michael@0: 	   (12 * (xyz_count + trc_count)); // the start of tag data elements.
michael@0: 
michael@0: 	for (index = 0; index < xyz_count; ++index) {
michael@0: 		// tag table
michael@0: 		write_u32(data, tag_table_offset, TAG_XYZ[index]);
michael@0: 		write_u32(data, tag_table_offset+4, tag_data_offset);
michael@0: 		write_u32(data, tag_table_offset+8, 20); // 20 bytes per TAG_(r/g/b)XYZ tag element
michael@0: 
michael@0: 		// tag data element
michael@0: 		write_u32(data, tag_data_offset, XYZ_TYPE);
michael@0: 		// reserved 4 bytes.
michael@0: 		write_u32(data, tag_data_offset+8, double_to_s15Fixed16Number(colorants.m[0][index]));
michael@0: 		write_u32(data, tag_data_offset+12, double_to_s15Fixed16Number(colorants.m[1][index]));
michael@0: 		write_u32(data, tag_data_offset+16, double_to_s15Fixed16Number(colorants.m[2][index]));
michael@0: 
michael@0: 		tag_table_offset += 12;
michael@0: 		tag_data_offset += 20;
michael@0: 	}
michael@0: 
michael@0: 	// Part2 : write rTRC, gTRC and bTRC
michael@0: 	for (index = 0; index < trc_count; ++index) {
michael@0: 		// tag table
michael@0: 		write_u32(data, tag_table_offset, TAG_TRC[index]);
michael@0: 		write_u32(data, tag_table_offset+4, tag_data_offset);
michael@0: 		write_u32(data, tag_table_offset+8, 14); // 14 bytes per TAG_(r/g/b)TRC element
michael@0: 
michael@0: 		// tag data element
michael@0: 		write_u32(data, tag_data_offset, CURVE_TYPE);
michael@0: 		// reserved 4 bytes.
michael@0: 		write_u32(data, tag_data_offset+8, 1); // count
michael@0: 		write_u16(data, tag_data_offset+12, float_to_u8Fixed8Number(gamma));
michael@0: 
michael@0: 		tag_table_offset += 12;
michael@0: 		tag_data_offset += 16;
michael@0: 	}
michael@0: 
michael@0: 	/* Part3 : write profile header
michael@0: 	 *
michael@0: 	 * Important header fields are left empty. This generates a profile for internal use only.
michael@0: 	 * We should be generating: Profile version (04300000h), Profile signature (acsp), 
michael@0: 	 * PCS illumiant field. Likewise mandatory profile tags are omitted.
michael@0: 	 */
michael@0: 	write_u32(data, 0, length); // the total length of this memory
michael@0: 	write_u32(data, 12, DISPLAY_DEVICE_PROFILE); // profile->class
michael@0: 	write_u32(data, 16, RGB_SIGNATURE); // profile->color_space
michael@0: 	write_u32(data, 20, XYZ_SIGNATURE); // profile->pcs
michael@0: 	write_u32(data, 64, QCMS_INTENT_PERCEPTUAL); // profile->rendering_intent
michael@0: 
michael@0: 	write_u32(data, ICC_PROFILE_HEADER_LENGTH, 6); // total tag count
michael@0: 
michael@0: 	// prepare the result
michael@0: 	*mem = data;
michael@0: 	*size = length;
michael@0: }