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IFF: read only support to Interchange Format Files

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Read-only support for most common Interchange Format Files (IFF). Supports IFF saved by Photoshop for the Amiga and Maya platform and HAM6 coded files.

Closes #29
This commit is contained in:
Mirco Miranda
2025-07-01 23:59:03 +02:00
committed by Albert Astals Cid
parent e6357c22f7
commit 4f2f2425d3
38 changed files with 2770 additions and 43 deletions
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45
src/imageformats/psd.cpp
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@ -28,6 +28,7 @@
#include "fastmath_p.h"
#include "microexif_p.h"
#include "packbits_p.h"
#include "psd_p.h"
#include "scanlineconverter_p.h"
#include "util_p.h"
@ -712,48 +713,6 @@ static bool IsSupported(const PSDHeader &header)
return true;
}
/*!
* \brief decompress
* Fast PackBits decompression.
* \param input The compressed input buffer.
* \param ilen The input buffer size.
* \param output The uncompressed target buffer.
* \param olen The target buffer size.
* \return The number of valid bytes in the target buffer.
*/
qint64 decompress(const char *input, qint64 ilen, char *output, qint64 olen)
{
qint64 j = 0;
for (qint64 ip = 0, rr = 0, available = olen; j < olen && ip < ilen; available = olen - j) {
signed char n = static_cast<signed char>(input[ip++]);
if (n == -128)
continue;
if (n >= 0) {
rr = qint64(n) + 1;
if (available < rr) {
--ip;
break;
}
if (ip + rr > ilen)
return -1;
memcpy(output + j, input + ip, size_t(rr));
ip += rr;
} else if (ip < ilen) {
rr = qint64(1-n);
if (available < rr) {
--ip;
break;
}
memset(output + j, input[ip++], size_t(rr));
}
j += rr;
}
return j;
}
/*!
* \brief imageFormat
* \param header The PSD header.
@ -1102,7 +1061,7 @@ bool readChannel(QByteArray &target, QDataStream &stream, quint32 compressedSize
if (stream.readRawData(tmp.data(), tmp.size()) != tmp.size()) {
return false;
}
if (decompress(tmp.data(), tmp.size(), target.data(), target.size()) < 0) {
if (packbitsDecompress(tmp.data(), tmp.size(), target.data(), target.size()) < 0) {
return false;
}
} else if (stream.readRawData(target.data(), target.size()) != target.size()) {