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*/
// This file is available under and governed by the GNU General Public // License version 2 only, as published by the Free Software Foundation. // However, the following notice accompanied the original version of this // file: // //--------------------------------------------------------------------------------- // // Little Color Management System // Copyright (c) 1998-2022 Marti Maria Saguer // // Permission is hereby granted, free of charge, to any person obtaining // a copy of this software and associated documentation files (the "Software"), // to deal in the Software without restriction, including 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, subject 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 NOT 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 LIABILITY, WHETHER IN AN ACTION // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. // //--------------------------------------------------------------------------------- //
#include"lcms2_internal.h"
// Generic I/O, tag dictionary management, profile struct
// IOhandlers are abstractions used by littleCMS to read from whatever file, stream, // memory block or any storage. Each IOhandler provides implementations for read, // write, seek and tell functions. LittleCMS code deals with IO across those objects. // In this way, is easier to add support for new storage media.
// NULL stream, for taking care of used space -------------------------------------
// NULL IOhandler basically does nothing but keep track on how many bytes have been // written. This is handy when creating profiles, where the file size is needed in the // header. Then, whole profile is serialized across NULL IOhandler and a second pass // writes the bytes to the pertinent IOhandler.
typedefstruct {
cmsUInt32Number Pointer; // Points to current location
} FILENULL;
// Those functions implements an iohandler which takes a block of memory as storage medium.
typedefstruct {
cmsUInt8Number* Block; // Points to allocated memory
cmsUInt32Number Size; // Size of allocated memory
cmsUInt32Number Pointer; // Points to current location int FreeBlockOnClose; // As title
// Writes data to memory, also keeps used space for further reference. static
cmsBool MemoryWrite(struct _cms_io_handler* iohandler, cmsUInt32Number size, constvoid*Ptr)
{
FILEMEM* ResData = (FILEMEM*) iohandler ->stream;
if (ResData == NULL) returnFALSE; // Housekeeping
// Check for available space. Clip. if (ResData->Pointer + size > ResData->Size) {
size = ResData ->Size - ResData->Pointer;
}
if (size == 0) returnTRUE; // Write zero bytes is ok, but does nothing
// Create a iohandler for memory block. AccessMode=='r' assumes the iohandler is going to read, and makes // a copy of the memory block for letting user to free the memory after invoking open profile. In write // mode ("w"), Buffer points to the begin of memory block to be written.
cmsIOHANDLER* CMSEXPORT cmsOpenIOhandlerFromMem(cmsContext ContextID, void *Buffer, cmsUInt32Number size, constchar* AccessMode)
{
cmsIOHANDLER* iohandler = NULL;
FILEMEM* fm = NULL;
// Returns file pointer position or 0 on error, which is also a valid position. static
cmsUInt32Number FileTell(cmsIOHANDLER* iohandler)
{ long t = ftell((FILE*)iohandler ->stream); if (t == -1L) {
cmsSignalError(iohandler->ContextID, cmsERROR_FILE, "Tell error; probably corrupted file"); return 0;
}
return (cmsUInt32Number)t;
}
// Writes data to stream, also keeps used space for further reference. Returns TRUE on success, FALSE on error static
cmsBool FileWrite(cmsIOHANDLER* iohandler, cmsUInt32Number size, constvoid* Buffer)
{ if (size == 0) returnTRUE; // We allow to write 0 bytes, but nothing is written
// Return the number of tags
cmsInt32Number CMSEXPORT cmsGetTagCount(cmsHPROFILE hProfile)
{
_cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile; if (Icc == NULL) return -1;
return (cmsInt32Number) Icc->TagCount;
}
// Return the tag signature of a given tag number
cmsTagSignature CMSEXPORT cmsGetTagSignature(cmsHPROFILE hProfile, cmsUInt32Number n)
{
_cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
if (n > Icc->TagCount) return (cmsTagSignature) 0; // Mark as not available if (n >= MAX_TABLE_TAG) return (cmsTagSignature) 0; // As double check
return Icc ->TagNames[n];
}
static int SearchOneTag(_cmsICCPROFILE* Profile, cmsTagSignature sig)
{ int i;
for (i=0; i < (int) Profile -> TagCount; i++) {
if (sig == Profile -> TagNames[i]) return i;
}
return -1;
}
// Search for a specific tag in tag dictionary. Returns position or -1 if tag not found. // If followlinks is turned on, then the position of the linked tag is returned int _cmsSearchTag(_cmsICCPROFILE* Icc, cmsTagSignature sig, cmsBool lFollowLinks)
{ int n;
cmsTagSignature LinkedSig;
do {
// Search for given tag in ICC profile directory
n = SearchOneTag(Icc, sig); if (n < 0) return -1; // Not found
if (!lFollowLinks) return n; // Found, don't follow links
// Is this a linked tag?
LinkedSig = Icc ->TagLinked[n];
// Yes, follow link if (LinkedSig != (cmsTagSignature) 0) {
sig = LinkedSig;
}
// No, make a new one if (Icc -> TagCount >= MAX_TABLE_TAG) {
cmsSignalError(Icc ->ContextID, cmsERROR_RANGE, "Too many tags (%d)", MAX_TABLE_TAG); returnFALSE;
}
// Checks for link compatibility static
cmsBool CompatibleTypes(const cmsTagDescriptor* desc1, const cmsTagDescriptor* desc2)
{
cmsUInt32Number i;
if (desc1 == NULL || desc2 == NULL) returnFALSE;
if (desc1->nSupportedTypes != desc2->nSupportedTypes) returnFALSE; if (desc1->ElemCount != desc2->ElemCount) returnFALSE;
for (i = 0; i < desc1->nSupportedTypes; i++)
{ if (desc1->SupportedTypes[i] != desc2->SupportedTypes[i]) returnFALSE;
}
returnTRUE;
}
// Enforces that the profile version is per. spec. // Operates on the big endian bytes from the profile. // Called before converting to platform endianness. // Byte 0 is BCD major version, so max 9. // Byte 1 is 2 BCD digits, one per nibble. // Reserved bytes 2 & 3 must be 0. static
cmsUInt32Number _validatedVersion(cmsUInt32Number DWord)
{
cmsUInt8Number* pByte = (cmsUInt8Number*) &DWord;
cmsUInt8Number temp1;
cmsUInt8Number temp2;
// Check device class static
cmsBool validDeviceClass(cmsProfileClassSignature cl)
{ if ((int)cl == 0) returnTRUE; // We allow zero because older lcms versions defaulted to that.
switch (cl)
{ case cmsSigInputClass: case cmsSigDisplayClass: case cmsSigOutputClass: case cmsSigLinkClass: case cmsSigAbstractClass: case cmsSigColorSpaceClass: case cmsSigNamedColorClass: returnTRUE;
default: returnFALSE;
}
}
// Read profile header and validate it
cmsBool _cmsReadHeader(_cmsICCPROFILE* Icc)
{
cmsTagEntry Tag;
cmsICCHeader Header;
cmsUInt32Number i, j;
cmsUInt32Number HeaderSize;
cmsIOHANDLER* io = Icc ->IOhandler;
cmsUInt32Number TagCount;
// Read the header if (io -> Read(io, &Header, sizeof(cmsICCHeader), 1) != 1) { returnFALSE;
}
// Validate file as an ICC profile if (_cmsAdjustEndianess32(Header.magic) != cmsMagicNumber) {
cmsSignalError(Icc ->ContextID, cmsERROR_BAD_SIGNATURE, "not an ICC profile, invalid signature"); returnFALSE;
}
// Adjust endianness of the used parameters
Icc -> DeviceClass = (cmsProfileClassSignature) _cmsAdjustEndianess32(Header.deviceClass);
Icc -> ColorSpace = (cmsColorSpaceSignature) _cmsAdjustEndianess32(Header.colorSpace);
Icc -> PCS = (cmsColorSpaceSignature) _cmsAdjustEndianess32(Header.pcs);
_cmsAdjustEndianess64(&Icc -> attributes, &Header.attributes);
Icc -> Version = _cmsAdjustEndianess32(_validatedVersion(Header.version));
if (Icc->Version > 0x5000000) {
cmsSignalError(Icc->ContextID, cmsERROR_UNKNOWN_EXTENSION, "Unsupported profile version '0x%x'", Icc->Version); returnFALSE;
}
if (!validDeviceClass(Icc->DeviceClass)) {
cmsSignalError(Icc->ContextID, cmsERROR_UNKNOWN_EXTENSION, "Unsupported device class '0x%x'", Icc->DeviceClass); returnFALSE;
}
// Get size as reported in header
HeaderSize = _cmsAdjustEndianess32(Header.size);
// Make sure HeaderSize is lower than profile size if (HeaderSize >= Icc ->IOhandler ->ReportedSize)
HeaderSize = Icc ->IOhandler ->ReportedSize;
// Get creation date/time
_cmsDecodeDateTimeNumber(&Header.date, &Icc ->Created);
// The profile ID are 32 raw bytes
memmove(Icc ->ProfileID.ID32, Header.profileID.ID32, 16);
// Read tag directory if (!_cmsReadUInt32Number(io, &TagCount)) returnFALSE; if (TagCount > MAX_TABLE_TAG) {
cmsSignalError(Icc ->ContextID, cmsERROR_RANGE, "Too many tags (%d)", TagCount); returnFALSE;
}
// Read tag directory
Icc -> TagCount = 0; for (i=0; i < TagCount; i++) {
if (!_cmsReadUInt32Number(io, (cmsUInt32Number *) &Tag.sig)) returnFALSE; if (!_cmsReadUInt32Number(io, &Tag.offset)) returnFALSE; if (!_cmsReadUInt32Number(io, &Tag.size)) returnFALSE;
// Perform some sanity check. Offset + size should fall inside file. if (Tag.size == 0 || Tag.offset == 0) continue; if (Tag.offset + Tag.size > HeaderSize ||
Tag.offset + Tag.size < Tag.offset) continue;
// Get an hexadecimal number with same digits as v static
cmsUInt32Number BaseToBase(cmsUInt32Number in, int BaseIn, int BaseOut)
{ char Buff[100]; int i, len;
cmsUInt32Number out;
for (len=0; in > 0 && len < 100; len++) {
Buff[len] = (char) (in % BaseIn);
in /= BaseIn;
}
for (i=len-1, out=0; i >= 0; --i) {
out = out * BaseOut + Buff[i];
}
// Open from memory block
cmsHPROFILE CMSEXPORT cmsOpenProfileFromMemTHR(cmsContext ContextID, constvoid* MemPtr, cmsUInt32Number dwSize)
{
_cmsICCPROFILE* NewIcc;
cmsHPROFILE hEmpty;
hEmpty = cmsCreateProfilePlaceholder(ContextID); if (hEmpty == NULL) return NULL;
NewIcc = (_cmsICCPROFILE*) hEmpty;
// Ok, in this case const void* is casted to void* just because open IO handler // shares read and writing modes. Don't abuse this feature!
NewIcc ->IOhandler = cmsOpenIOhandlerFromMem(ContextID, (void*) MemPtr, dwSize, "r"); if (NewIcc ->IOhandler == NULL) goto Error;
// Dump tag contents. If the profile is being modified, untouched tags are copied from FileOrig static
cmsBool SaveTags(_cmsICCPROFILE* Icc, _cmsICCPROFILE* FileOrig)
{
cmsUInt8Number* Data;
cmsUInt32Number i;
cmsUInt32Number Begin;
cmsIOHANDLER* io = Icc ->IOhandler;
cmsTagDescriptor* TagDescriptor;
cmsTagTypeSignature TypeBase;
cmsTagTypeSignature Type;
cmsTagTypeHandler* TypeHandler;
cmsFloat64Number Version = cmsGetProfileVersion((cmsHPROFILE) Icc);
cmsTagTypeHandler LocalTypeHandler;
for (i=0; i < Icc -> TagCount; i++) {
if (Icc ->TagNames[i] == (cmsTagSignature) 0) continue;
// Linked tags are not written if (Icc ->TagLinked[i] != (cmsTagSignature) 0) continue;
Icc -> TagOffsets[i] = Begin = io ->UsedSpace;
Data = (cmsUInt8Number*) Icc -> TagPtrs[i];
if (!Data) {
// Reach here if we are copying a tag from a disk-based ICC profile which has not been modified by user. // In this case a blind copy of the block data is performed if (FileOrig != NULL && Icc -> TagOffsets[i]) {
// Search for support on this tag
TagDescriptor = _cmsGetTagDescriptor(Icc-> ContextID, Icc -> TagNames[i]); if (TagDescriptor == NULL) continue; // Unsupported, ignore it
if (TagDescriptor ->DecideType != NULL) {
Type = TagDescriptor ->DecideType(Version, Data);
} else {
// Low-level save to IOHANDLER. It returns the number of bytes used to // store the profile, or zero on error. io may be NULL and in this case // no data is written--only sizes are calculated
cmsUInt32Number CMSEXPORT cmsSaveProfileToIOhandler(cmsHPROFILE hProfile, cmsIOHANDLER* io)
{
_cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
_cmsICCPROFILE Keep;
cmsIOHANDLER* PrevIO = NULL;
cmsUInt32Number UsedSpace;
cmsContext ContextID;
_cmsAssert(hProfile != NULL);
if (!_cmsLockMutex(Icc->ContextID, Icc->UsrMutex)) return 0;
memmove(&Keep, Icc, sizeof(_cmsICCPROFILE));
// Same as anterior, but for memory blocks. In this case, a NULL as MemPtr means calculate needed space only
cmsBool CMSEXPORT cmsSaveProfileToMem(cmsHPROFILE hProfile, void *MemPtr, cmsUInt32Number* BytesNeeded)
{
cmsBool rc;
cmsIOHANDLER* io;
cmsContext ContextID = cmsGetProfileContextID(hProfile);
_cmsAssert(BytesNeeded != NULL);
// Should we just calculate the needed space? if (MemPtr == NULL) {
// Returns TRUE if a given tag is supported by a plug-in static
cmsBool IsTypeSupported(cmsTagDescriptor* TagDescriptor, cmsTagTypeSignature Type)
{
cmsUInt32Number i, nMaxTypes;
nMaxTypes = TagDescriptor->nSupportedTypes; if (nMaxTypes >= MAX_TYPES_IN_LCMS_PLUGIN)
nMaxTypes = MAX_TYPES_IN_LCMS_PLUGIN;
for (i=0; i < nMaxTypes; i++) { if (Type == TagDescriptor ->SupportedTypes[i]) returnTRUE;
}
returnFALSE;
}
// That's the main read function void* CMSEXPORT cmsReadTag(cmsHPROFILE hProfile, cmsTagSignature sig)
{
_cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
cmsIOHANDLER* io;
cmsTagTypeHandler* TypeHandler;
cmsTagTypeHandler LocalTypeHandler;
cmsTagDescriptor* TagDescriptor;
cmsTagTypeSignature BaseType;
cmsUInt32Number Offset, TagSize;
cmsUInt32Number ElemCount; int n;
if (!_cmsLockMutex(Icc->ContextID, Icc ->UsrMutex)) return NULL;
n = _cmsSearchTag(Icc, sig, TRUE); if (n < 0)
{ // Not found, return NULL
_cmsUnlockMutex(Icc->ContextID, Icc->UsrMutex); return NULL;
}
// If the element is already in memory, return the pointer if (Icc -> TagPtrs[n]) {
// Seek to its location if (!io -> Seek(io, Offset)) goto Error;
// Search for support on this tag
TagDescriptor = _cmsGetTagDescriptor(Icc-> ContextID, sig); if (TagDescriptor == NULL) {
char String[5];
_cmsTagSignature2String(String, sig);
// An unknown element was found.
cmsSignalError(Icc ->ContextID, cmsERROR_UNKNOWN_EXTENSION, "Unknown tag type '%s' found.", String); goto Error; // Unsupported.
}
// if supported, get type and check if in list
BaseType = _cmsReadTypeBase(io); if (BaseType == 0) goto Error;
if (!IsTypeSupported(TagDescriptor, BaseType)) goto Error;
TagSize -= 8; // Already read by the type base logic
// Get type handler
TypeHandler = _cmsGetTagTypeHandler(Icc ->ContextID, BaseType); if (TypeHandler == NULL) goto Error;
LocalTypeHandler = *TypeHandler;
// Read the tag
Icc -> TagTypeHandlers[n] = TypeHandler;
// The tag type is supported, but something wrong happened and we cannot read the tag. // let know the user about this (although it is just a warning) if (Icc -> TagPtrs[n] == NULL) {
// This is a weird error that may be a symptom of something more serious, the number of // stored item is actually less than the number of required elements. if (ElemCount < TagDescriptor ->ElemCount) {
// Get true type of data
cmsTagTypeSignature _cmsGetTagTrueType(cmsHPROFILE hProfile, cmsTagSignature sig)
{
_cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
cmsTagTypeHandler* TypeHandler; int n;
// Search for given tag in ICC profile directory
n = _cmsSearchTag(Icc, sig, TRUE); if (n < 0) return (cmsTagTypeSignature) 0; // Not found, return NULL
// Get the handler. The true type is there
TypeHandler = Icc -> TagTypeHandlers[n]; return TypeHandler ->Signature;
}
// Write a single tag. This just keeps track of the tak into a list of "to be written". If the tag is already // in that list, the previous version is deleted.
cmsBool CMSEXPORT cmsWriteTag(cmsHPROFILE hProfile, cmsTagSignature sig, constvoid* data)
{
_cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
cmsTagTypeHandler* TypeHandler = NULL;
cmsTagTypeHandler LocalTypeHandler;
cmsTagDescriptor* TagDescriptor = NULL;
cmsTagTypeSignature Type; int i;
cmsFloat64Number Version; char TypeString[5], SigString[5];
if (!_cmsLockMutex(Icc->ContextID, Icc ->UsrMutex)) returnFALSE;
// To delete tags. if (data == NULL) {
// Delete the tag
i = _cmsSearchTag(Icc, sig, FALSE); if (i >= 0) {
// Use zero as a mark of deleted
_cmsDeleteTagByPos(Icc, i);
Icc ->TagNames[i] = (cmsTagSignature) 0;
_cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex); returnTRUE;
} // Didn't find the tag goto Error;
}
if (!_cmsNewTag(Icc, sig, &i)) goto Error;
// This is not raw
Icc ->TagSaveAsRaw[i] = FALSE;
// This is not a link
Icc ->TagLinked[i] = (cmsTagSignature) 0;
// Get information about the TAG.
TagDescriptor = _cmsGetTagDescriptor(Icc-> ContextID, sig); if (TagDescriptor == NULL){
cmsSignalError(Icc ->ContextID, cmsERROR_UNKNOWN_EXTENSION, "Unsupported tag '%x'", sig); goto Error;
}
// Now we need to know which type to use. It depends on the version.
Version = cmsGetProfileVersion(hProfile);
if (TagDescriptor ->DecideType != NULL) {
// Let the tag descriptor to decide the type base on depending on // the data. This is useful for example on parametric curves, where // curves specified by a table cannot be saved as parametric and needs // to be casted to single v2-curves, even on v4 profiles.
Type = TagDescriptor ->DecideType(Version, data);
} else {
Type = TagDescriptor ->SupportedTypes[0];
}
// Does the tag support this type? if (!IsTypeSupported(TagDescriptor, Type)) {
cmsSignalError(Icc ->ContextID, cmsERROR_UNKNOWN_EXTENSION, "Unsupported type '%s' for tag '%s'", TypeString, SigString); goto Error; // Should never happen
}
_cmsTagSignature2String(TypeString, (cmsTagSignature) Type);
_cmsTagSignature2String(SigString, sig);
cmsSignalError(Icc ->ContextID, cmsERROR_CORRUPTION_DETECTED, "Malformed struct in type '%s' for tag '%s'", TypeString, SigString);
// Read and write raw data. Read/Write Raw/cooked pairs try to maintain consistency within the pair. Some sequences // raw/cooked would work, but at a cost. Data "cooked" may be converted to "raw" by using the "write" serialization logic. // In general it is better to avoid mixing pairs.
// Obtain type handling for the tag
TypeHandler = Icc ->TagTypeHandlers[i];
TagDescriptor = _cmsGetTagDescriptor(Icc-> ContextID, sig); if (TagDescriptor == NULL) {
cmsCloseIOhandler(MemIO); goto Error;
}
// Similar to the anterior. This function allows to write directly to the ICC profile any data, without // checking anything. As a rule, mixing Raw with cooked doesn't work, so writing a tag as raw and then reading // it as cooked without serializing does result into an error. If that is what you want, you will need to dump // the profile to memry or disk and then reopen it.
cmsBool CMSEXPORT cmsWriteRawTag(cmsHPROFILE hProfile, cmsTagSignature sig, constvoid* data, cmsUInt32Number Size)
{
_cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile; int i;
if (!_cmsLockMutex(Icc->ContextID, Icc ->UsrMutex)) return 0;
if (!_cmsNewTag(Icc, sig, &i)) {
_cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex); returnFALSE;
}
// Mark the tag as being written as RAW
Icc ->TagSaveAsRaw[i] = TRUE;
Icc ->TagNames[i] = sig;
Icc ->TagLinked[i] = (cmsTagSignature) 0;
// Keep a copy of the block
Icc ->TagPtrs[i] = _cmsDupMem(Icc ->ContextID, data, Size);
Icc ->TagSizes[i] = Size;
// Using this function you can collapse several tag entries to the same block in the profile
cmsBool CMSEXPORT cmsLinkTag(cmsHPROFILE hProfile, cmsTagSignature sig, cmsTagSignature dest)
{
_cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile; int i;
if (!_cmsLockMutex(Icc->ContextID, Icc ->UsrMutex)) returnFALSE;
if (!_cmsNewTag(Icc, sig, &i)) {
_cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex); returnFALSE;
}
// Returns the tag linked to sig, in the case two tags are sharing same resource
cmsTagSignature CMSEXPORT cmsTagLinkedTo(cmsHPROFILE hProfile, cmsTagSignature sig)
{
_cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile; int i;
// Search for given tag in ICC profile directory
i = _cmsSearchTag(Icc, sig, FALSE); if (i < 0) return (cmsTagSignature) 0; // Not found, return 0
return Icc -> TagLinked[i];
}
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