Init

Makefile

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+#CFLAGS=-O3 -Wall
+CFLAGS=-g -ggdb -Wall
+#LDLIBS=-l
+
+all: pacextractor
+
+version.h:
+	if [ ! -f version.h ]; then \
+	if [ -d .git ]; then \
+	echo '#define VERSION_STR "$(shell git describe --tags --abbrev=0)"' > version.h; \
+	else \
+	echo '#define VERSION_STR ""' > version.h; \
+	fi \
+	fi
+
+pacextractor.o: version.h
+
+clean:
+	rm -f pacextractor *.o version.h
+
+.PHONY:	clean all

README.md

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+# Extractor of SpreadTrum firmware files with extension pac
+
+Extract all data that I may recognize in package.

pacextractor.c

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+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdint.h>
+
+typedef struct {
+    int16_t someField[24];
+    int32_t someInt;
+    int16_t productName[256];
+    int16_t firmwareName[256];
+    int32_t partitionCount;
+    int32_t partitionsListStart;
+    int32_t someIntFields1[5];
+    int16_t productName2[50];
+    int16_t someIntFields2[6];
+    int16_t someIntFields3[2];
+} PacHeader;
+
+typedef struct {
+    uint32_t length;
+    int16_t partitionName[256];
+    int16_t fileName[512];
+    uint32_t partitionSize;
+    int32_t someFileds1[2];
+    uint32_t partitionAddrInPac;
+    int32_t someFileds2[3];
+    int32_t dataArray[];
+} PartitionHeader;
+
+void getString(int16_t* baseString, char* resString) {
+    if(*baseString == 0) {
+        *resString = 0;
+        return;
+    }
+    int length = 0;
+    do {
+        *resString = 0xFF & *baseString;
+        resString++;
+        baseString++;
+        if(++length > 256)
+            break;
+    } while(baseString > 0);
+    *resString = 0;
+}
+
+int main(int argc, char** argv) {
+    if(argc < 2) {
+        printf("command format:\n   capextractor <firmware name>.pac");
+        exit(EXIT_FAILURE);
+    }
+
+    int fd = open(argv[1], O_RDONLY);
+    if (fd == -1) {
+        printf("file %s is not find", argv[1]);
+        exit(EXIT_FAILURE);
+    }
+
+//    fseek(fd, 0, SEEK_END);
+//    int firmwareSize = (fd);
+//    fseek(fd, 0, SEEK_SET);
+    struct stat st;
+    stat(argv[1], &st);
+    int firmwareSize = st.st_size;
+    if(firmwareSize < sizeof(PacHeader)) {
+        printf("file %s is not firmware", argv[1]);
+        exit(EXIT_FAILURE);
+    }
+
+    PacHeader pacHeader;
+    size_t rb =read(fd, &pacHeader, sizeof(PacHeader));
+    if(rb <= 0) {
+        printf("Error while parsing PAC header");
+        exit(EXIT_FAILURE);
+    }
+
+    char buffer[256];
+    char buffer1[256];
+    getString(pacHeader.firmwareName, buffer);
+    printf("Firmware name: %s\n", buffer);
+    uint32_t curPos = pacHeader.partitionsListStart;
+    PartitionHeader** partHeaders = malloc(sizeof(PartitionHeader**)*pacHeader.partitionCount);
+    int i;
+    for(i = 0; i < pacHeader.partitionCount; i++) {
+        lseek(fd, curPos, SEEK_SET);
+        uint32_t length;
+        rb =read(fd, &length, sizeof(uint32_t));
+        if(rb <= 0) {
+            printf("Partition header error");
+            exit(EXIT_FAILURE);
+        }
+        partHeaders[i] = malloc(length);
+        lseek(fd, curPos, SEEK_SET);
+        curPos += length;
+        rb =read(fd, partHeaders[i], length);
+        if(rb <= 0) {
+            printf("Partition header error");
+            exit(EXIT_FAILURE);
+        }
+        getString(partHeaders[i]->partitionName, buffer);
+        getString(partHeaders[i]->fileName, buffer1);
+        printf("Partition name: %s\n\twith file name: %s\n\twith size %u\n", buffer, buffer1, partHeaders[i]->partitionSize);
+    }
+
+    for(i = 0; i < pacHeader.partitionCount; i++) {
+        if(partHeaders[i]->partitionSize == 0) {
+            free(partHeaders[i]);
+            continue;
+        }
+        lseek(fd, partHeaders[i]->partitionAddrInPac, SEEK_SET);
+        getString(partHeaders[i]->fileName, buffer);
+        remove(buffer);
+        int fd_new = open(buffer, O_WRONLY | O_CREAT, 0666);
+        printf("Extract %s\n", buffer);
+        uint32_t dataSizeLeft = partHeaders[i]->partitionSize;
+        while(dataSizeLeft > 0) {
+            uint32_t copyLength = (dataSizeLeft > 256) ? 256 : dataSizeLeft;
+            dataSizeLeft -= copyLength;
+            rb =read(fd, buffer, copyLength);
+            if(rb != copyLength) {
+                printf("Partition image extraction error");
+                exit(EXIT_FAILURE);
+            }
+            rb = write(fd_new, buffer, copyLength);
+            if(rb != copyLength) {
+                printf("Partition image extraction error");
+                exit(EXIT_FAILURE);
+            }
+            printf("\r\t%02d%%", (uint64_t)100 - (uint64_t)100*dataSizeLeft/partHeaders[i]->partitionSize);
+        }
+        printf("\n");
+        close(fd_new);
+        free(partHeaders[i]);
+    }
+    free(partHeaders);
+    close(fd);
+
+    return EXIT_SUCCESS;
+}